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SN Applied Sciences

, 1:265 | Cite as

Photocatalytic performance and photodegradation kinetics of Fenton-like process based on haematite nanocrystals for basic dye removal

  • Shehab A. MansourEmail author
  • Maha A. Tony
  • Aghareed M. Tayeb
Research Article
  • 163 Downloads
Part of the following topical collections:
  1. 2. Earth and Environmental Sciences (general)

Abstract

Photo-Fenton’s reagent based on haematite nanocrystals was investigated to oxidize simulated textile wastewater streams loaded with methylene blue (MB) dye to signify the role of nanocrystals in the Fenton system. Various oxidation systems were compared such as UV photocatalysis, H2O2, dark Fenton’s reagent and nanohaematite photo-Fenton reaction. Different operating parameters were investigated, and the maximum oxidation rate reached 70% at the optimal experimental conditions of 40 mg/L nanohaematite, 400 mg/L H2O2 and initial pH at 3.0 within 90 min of reaction time. Furthermore, temperature increases showed increment in the reaction rate. Also, the reaction kinetics was studied and the system followed the pseudo-second-order model. Finally, thermodynamic parameters, i.e., ∆G′, ∆H′ and ∆S′, for MB oxidation with photo-Fenton system were investigated and the data illustrated that the reaction was exothermic with non-spontaneous nature.

Keywords

Methylene blue Wastewater Photo-Fenton Nanomaterial Haematite 

1 Introduction

A huge amount of dye-containing wastewater is produced during the dyeing processes in different industries, for example, textile and dying, leather, food processing, cosmetics, plastic and paper industries. Discharge of those colored wastewater is a major problem for environmental management particularly in developing countries. [1, 2] The textile industry is one of the major sources, which discharges large amounts of industrial wastewater. In industrial use, there are nearly 10,000 of different dyes and pigments. Once dyes are released into environment, it causes coloration of natural water bodies, since it is synthetic aromatic water-soluble and dispersible organic compounds. Among the different types of dyes, methylene blue (MB), which is considered as a cationic dye, is used in dyeing, paint production and wool dyeing [1, 2, 3].

The discharges from dying factories including dyes effluents are hazardous chemicals. It is well recognized that dyes effluents undergo water pollution because they are highly toxic and carcinogenic. Those dyes cause damage to the aquatic environment by chemical changes as well as biological changes. The dissolved O2 is consumed and thus disturbs the aquatic ecosystem. Subsequently, there will be a challenge for the existence of fishes and other lives in wide spread [4].

There are various conventional chemical and biological methods to remove dyes from the water. However, high expenses make these methods limited and unfavorable in developing countries. However, these processes result in concentrated sludges which require further processing and disposal. In addition, conventional treatment processes have difficulty in fully removing the pollutants from such wastewater. Moreover, it is not favorable for low efficiency and low reaction rate [5].

Abundant research and investigations have been carried out in different part of the world for the search of different methods for treatment suitable to remove dyes from wastewater in a reliable cost. Such methods may include the chemical oxidation processes such as the oxidation by ozone or combination of UV illumination and ozone and H2O2, but they are expensive for treating such raw textile wastewater. Furthermore, it is hard to remove color [6, 7]. In this context, the development of new processes for wastewater treatment in order to degrade these compounds in textile industry effluents is very important. An extensively studied alternative is the use of advanced oxidation process (AOP). Fenton’s reagent is one of AOPs which is based on the formation of high active groups, namely hydroxyl radicals, which are responsible for oxidizing pollutants to smaller and less contaminating molecules or even mineralizing them by turning them into CO2, H2O and inorganic ions from atoms [8, 9, 10, 11, 12, 13, 14].

Fenton’s reagent process is one of the methods that are applied to significantly reduce the concentration of dye in wastewater. For instance, Rahman et al. [5] applied such reagent for the treatment of commercial textile dye named malachite green. The oxidation of methylene blue by Fenton’s reagent was achieved by Liu et al. [15]. El Haddad et al. [6] treated azo dye (Reactive Yellow 84) using Fenton’s reagent. Also, Fenton-like reagent was used in treating the Amaranth Red [16]. However, Khan et al. [7] investigated the photocatalytic degradation of MB in wastewater. The process is a radical reaction, which generates hydroxyl radicals that are capable of oxidizing even the most resistant pollutants present in the wastewater. The main advantages of the method include high oxidation efficiency, inexpensive and easily available substrates and simple procedure. The major reaction in this process includes Fenton reaction, photolysis of hydrogen peroxide and photoreduction of ferric ion in order to produce ·OH radical as illustrated in the following equation [17]:
$${\text{Fe}}^{2 + } + {\text{H}}_{2} {\text{O}}_{2} \to \cdot {\text{OH}} + {\text{Fe}}^{3 + } + {\text{OH}}^{ - }$$
(1)

Novelty in the oxidation of pollutants by the Fenton method is running it with the participation of iron nanocompounds. The presence of nanoparticles has an influence on the oxidation of many compounds present in water. With the use of iron nanocompounds, the removal of trichloroethylene [18], phenol [19], olefins [20], humic acids [21], antibiotics [22] and chlorophenols [23] was investigated. The presence of nanoparticles affects also the oxidation of dyestuff in water solutions, namely AB24 dye and industrial wastewater [24]. However, according to the literature, there is a lack in applying it for MB dyestuff wastewater effluents.

In the present investigation, haematite (α-Fe2O3) nanocrystalline powder was synthesized using low-cost simple sol–gel technique. Based on such nanopowder as photocatalysis, UV light augmented with nanohaematite Fenton’s reagent (NHFR) was used to treat MB dye-containing wastewater. The NHFR parameters were investigated, and the process was compared with other treatment processes.

2 Materials and methods

Nanocrystalline Fe2O3 powder was synthesized using sol–gel route. The used procedure was reported elsewhere [25] by using ferric chloride hexahydrate (FeCl3·6H2O), methanol alcohol and diethanolamine [HN (CH2CH2OH)2, DEA] as a precursor salt, solvent and chelating agent, respectively. Furthermore, the final product of Fe2O3 nanopowder was examined and confirmed by X-ray diffraction (XRD), high-resolution transmission electron microscope and Fourier transform infrared (FTIR) according to a preliminary investigation. The characterization of the synthesized powder confirmed the formation of α-Fe2O3 in nanosize with rhombohedral structure [25].

Methylene blue (MB) degradation was studied in the presence of haematite nanocrystals under UV irradiation. The photo-Fenton’s reagents were prepared by adding different doses of hydrogen peroxide (30%) into the synthesized haematite nanopowder. The photocatalytic activity of the prepared photo-Fenton was carried by the degradation of MB aqueous solution. The pH values of (500 mL) water dye solutions were adjusted to the desired value by means of 5 N solution of sulfuric acid using a digital pH meter model type pH2005. Prior to the UV irradiation, the desired amount of the nano-Fenton’s reagent was dispersed in the MB aqueous solution in dark at RT for 2 min to reach adsorption–desorption equilibrium using magnetic stirrer. Thereafter, the reaction is subjected to the UV illumination using UV-A, 15-W lamp, enclosed in a transparent glass tube for UV light, and protected in a cover from a stainless steel. The solution is passed through the UV light during the tubular reactor, as shown in Fig. 1. The reaction mixture in that tubular reactor was circulated using a variable speed-dosing pump. At different time intervals, the treated water dye solutions were centrifuged by TDL 16B centrifuge type, to remove the remaining nanopowder. The experiments with the collected solutions were conducted using spectrophotometer (UV-1601, Shimadzu, Model TCC-240A, Japan) to monitor the absorption of the maximum absorbance peak of MB at 664 nm.
Fig. 1

Schematic representation of a treatment steps

3 Results and discussions

3.1 Methylene blue degradation

3.1.1 Comparison of different degradation systems

Firstly, preliminary experiments were conducted to check the H2O2/UV treatment using H2O2 different doses in a wide range from 100 to 2000 mg/L. It was found that the removal rate is very low and increases with increasing the reagent doses up to 200 mg/L. The obtained removal percentage are 2 and 10% for 100 and 200 mg/L, respectively. In contrary, the decrease in the removal was achieved which reached 3 and 6% for 400 and 1000 mg/L, respectively. In addition, the 2000 mg/L of the peroxide shows no removal at all. This occurrence could be explained as follows: (1) At low initial H2O2 concentration relatively ·OH radicals were formed for dye oxidation and thus the reduction in the removal rate. Though, by increasing peroxide concentration, more ·OH radicals were generated upon its photodissociation; (2) photolysis of H2O2 produces ·OH radicals which react with the dye molecules; however, excess H2O2 and high ·OH concentration result in a competitive reaction resulting a reduction in the dye removal. In other words, the generated ·OH mostly reacts with the excess peroxide and produces HO2, which are less reactive than ·OH and decreasing the overall reaction rate [26].

For the object of investigating and comparing the performances of the photo-Fenton system and different degradation processes, four experiments were separately conducted in the treatment of wastewater contaminated with MB. Figure 2 gives the comparison of different degradation systems with the performance of NHFR using the UV illumination. Fenton’s reagent doses used were: [Fe3+] = 40 mg/L; [H2O2] = 400 mg/L, and the starting pH value of the MB wastewater was adjusted at 3 for 10 ppm MB dye solution concentration. Investigation of the results illustrates that the UV photolysis without the Fenton’s reagent addition only completed a 26% reduction after more than 2 h in the MB concentration. Nevertheless, the sole use of Fenton’s reagent achieved a MB reduction of 37%. However, when H2O2 was used for treatment (400 mg/L), only 3% of removal was reached. Obviously, the OH radicals are generated through the reaction between the Fe2+ and H2O2 which plays a vital role in the MB degradation process [27, 28].
Fig. 2

Comparison of different degradation systems on MB removal

As reported in the literature [3], MB dye consists of aromatic compound and Fenton’s reagent is proved to be an efficient method in the destruction of such those aromatic compounds. The destruction is summarized as follows: The hydroxyl radicals are attacking those aromatic rings, thus opening the rings and producing reaction intermediates, which are eventually transformed to harmless end products such as CO2 and H2O. Additionally, augmentation of the UV radiation the Fenton’s reagent (namely photo-Fenton process) led to more pronounced degradation of MB about 84%. However, the processes that use UV radiation in conjunction with the nanocrystals as the source of chemical reagents obtain better results since higher hydroxyl radicals were generated which are mainly responsible for organics oxidation. These remarks are in agreement with that presented by Galvao et al. [29], Moraes et al. [30] and Tony and Mansour [10].

3.1.2 Effect of Fenton’s reagent parameters

Photo-Fenton’s process is highly sensitive to the initial H2O2, iron catalyst concentration and pH value. This reagent is extremely producer of ·OH radicals, and the reaction rate is limited by the ·OH generation. Traditionally, hydroxyl radical has been viewed as the workhorse of hydrogen peroxide oxidation systems. Thus, the main source of OH radicals and oxygen depends on the hydrogen peroxide. Figure 3a shows the effect of hydrogen peroxide increase on the MB removal at constant pH 3 and Fe3+ of 40 mg/L. The results show that the degradation rate of MB increases with an increase in initial H2O2 concentration from 100 to 400 mg/L, but in excess of about 400 mg/L, the H2O2 dose of 1000 mg/L, plot of the reaction rate curve is almost horizontal. This could be illustrated that the presence of H2O2 beyond the ratio with Fe3+ does not improve the MB degradation. According to Murry and Parson [31], hydrogen peroxide may also serve as a scavenger of OH radicals when it will be in excess. These results of effect of increasing H2O2 on the degradation system are in accordance with the previous results obtained by Tony et al. [13] in the treatment of oily wastewater.
Fig. 3

Effect of photo-Fenton’s parameters on MB degradation (operating parameters [MB concentration] = 10 mg/L; flow rate = 25 mL/min), a effect of H2O2, b effect of Fe3+, c effect of pH

The production of OH radicals from H2O2 is catalyzed by Fe3+ and thus depends on the concentration of the catalyst as shown in Fig. 3b. Photo-Fenton treatment was carried out at different Fe3+ dosages (20–80 mg/L) while the pH (3.0) and the H2O2 dosage (400 mg/L) were maintained constant. The influence of the Fe3+ dosage has a positive effect on degradation of MB, while above 40 mg/L the excess of Fe3+ renders the reaction rate. Indeed, the UV radiation proved to be very efficient in the H2O2 utilization so that the addition of ferrous ion did not lead to a further improvement. The limiting reagent for photo-Fenton’s process corresponds to the ferrous ions, and it is present in much lower concentration than hydrogen peroxide. The catalyst is most efficiently used in the system. These results clearly demonstrate the advantage of the photo-Fenton process. Due to the low of Fe3+, the addition of Fe3+ is strongly reduced in the produced iron sludge [7, 13]. Therefore, nanoheamatite is significantly applied as the catalyst source to substitute the classic iron source in the Fenton system for decreasing the iron amount used with a high surface area reagent.

Fenton process has a typically sharp, preferred pH region in which it is optimally operated. The pH value influences the generation of OH radicals and thus the activity of oxidation, the speciation of iron, and hydrogen peroxide decomposition. Moreover, the oxidation potential of OH radicals decreases with increasing pH.

Figure 3c illustrates the pH effect on MB removal in the presence of NHFR. It is observed that, by increasing the pH of the dye solution from 2 to 3, there is an increase in the removal percent. This phenomenon of the increasing trend of MB removal with increasing the initial pH of the solution is dependent on the nature of the adsorbent. However, at lower pH, the % removal of MB was 64%. Interestingly, there is an increased trend in the removal rate at higher pH 3.0. More significant enhancement in the % removal of MB is achieved at pH 3.0 (97.5%). For pH values above 3 such as 4 and 8, the degradation strongly decreases as Fe3+-complexes precipitate. This is quite similar to the previous reports in which it was an optimum pH of 3 [32, 33].

As reported in the literature [34], the production yield of the OH radicals in the pH range of 2–4 is highest. This could be explained by reduction in the reaction rate. Organometallic complex is produced which helps in the regeneration of H2O2 rather than the production of the hydroxyl radicals. Besides, the presence of inorganic carbon in wastewater also scavenges the hydroxyl radical production [35]. Therefore, controlling the pH in the Fenton’s system to the acidic conditions increases the OH radicals production. Thus, the optimum Fenton’s reagent conditions are pH 3.0, H2O2 400 mg/L and Fe3+ 40 mg/L. However, further research should be conducted to overcome the acidic pH effluents after the Fenton’s reaction to reach a commercial application.

3.1.3 Effect of initial dye concentration

Removal efficiency greatly depends on the initial concentration of solution of pollutant. For estimating the effect of initial dye concentration on the reaction rate, different 500 mL solution of including different initial MB concentrations was treated under UV radiation after the pH was adjusted at 3.0 and then 40 mg/L of haematite nanopowder was added; subsequently, the Fenton’s reaction was initiated with the addition of 400 mg/L H2O2 taking flow rate 25 mL/min as constant values. The graph in Fig. 4 shows the comparison of different degradation levels from 5 mg/L to 40 mg/L. It shows the decrease in the removal efficiency with increasing initial concentrations, and it is observed the removal rate of MB is 93, 84, 48 and 20% for initial MB concentrations of 5, 10, 20 and 40 mg/L, respectively. Increasing removal % of MB with decreasing initial MB concentration can be attributed to the enhancement of UV light penetration, resulting in enhanced concentration removal. This observation of the increase in the pollutant removal rate with decreasing the initial pollutant concentration in the photocatalytic oxidation reactions was previously described by Najjar et al. [36] in the photocatalytic treatment of the nitrophenol.
Fig. 4

Effect of initial MB concentration (operating parameters [Fe3+] = 40 mg/L; [H2O2] = 400 mg/L; pH = 3, flow rate = 25 mL/min)

3.1.4 Effect of flow rate

In order to investigate the flow rate on the removal of MB, different flow rates were applied and the results are presented in Fig. 5. The results in the figure reveal that the reduction efficiency decreases with increase in the flow rate of the dye solution. Almost 13% of MB was removed at flow rate 15 mL/min, and then, it is increased to 75% for flow rate 25 mL/min, whereas 33% and 20% of MB were removed at flow rate 40 and 70 mL/min, respectively. The role in increasing the degradation rate of pollutant with increasing the flow rate is valid up to a certain limit, and then, the reaction becomes slower. These phenomena could be illustrated by the fact that once the flow rate was slow, MB in the sample solution got more contact time with UV radiation induced. However, the flow rate of 25 mL/min was chosen to be the optimum because it makes the removal process higher. These results accord with the findings of [37], who investigated the photo-Fenton treatment of a petroleum refinery wastewater.
Fig. 5

Effect of flow rate on the NHFR process (operating parameters [Fe3+] = 40 mg/L; [H2O2] = 400 mg/L; pH = 3)

3.1.5 Effect of temperature

The effect of the treatment temperature on the mineralization of MB was examined. Four different temperatures between 25 and 80 °C were tested on the removal rate of MB. Other experimental conditions except temperature were kept same. It could be understood from the results in Fig. 6 that the removal efficiencies increased as the temperature increased. As temperature increased from 25 to 80 °C, the reduction rate increased and showed 44, 49, 94 and 97%, at only 30 min of reaction time for temperatures 25, 40, 50 and 80 °C, respectively. Thus, higher temperature was most favorable for pollutant removal. The increase in rate with the increase in the solution temperature is illustrated by the increase in the collision frequency of molecules in solution as the temperature increased [38]. This investigation confirms the importance of the solar NHFR when using direct photolysis of solar radiation as the efficiency will be increased.
Fig. 6

Effect of temperature on the NHFR process (operating parameters [Fe3+] = 40 mg/L; [H2O2] = 400 mg/L; pH = 3)

3.2 Kinetics and thermodynamic investigation

To follow the kinetic MB dye removal using photo-Fenton reaction, different contact time ranges from 0 to 60 min under isothermal condition at various temperatures (25, 40 and 50 °C) were studied. According to the literature, the most common following reaction rates in wastewater treatment are zero, first and second reaction orders as shown in Eqs. (13), respectively [39, 40, 41].
$$\left( {\frac{{{\text{d}}c}}{{{\text{d}}t}}} \right) = - k_{0}$$
(2)
$$\left( {\frac{{{\text{d}}c}}{{{\text{d}}t}}} \right) = - k_{1} \,C$$
(3)
$$\left( {\frac{{{\text{d}}c}}{{{\text{d}}t}}} \right) = - k_{2} C^{2}$$
(4)
where C is the concentration of MB, Ct is the concentration of MB at time t, C0 is MB initial concentration, and t is the reaction time. Additionally, k0, k1 and k2 represent the pseudo-kinetic rate constants of zero-, first- and second-order reaction kinetics, respectively.
Thus, those three models were checked for MB degradation using the photo-Fenton’s reagent by plotting the linear regression analysis of the integration of Eqs. (23) to investigate the order of reaction. The results given in Table 1 indicate the regression coefficient, R2, is higher for the pseudo-second order of reaction. Furthermore, pseudo-second-order kinetic reaction constant, k2, is sensitively affected by temperature which is increased from 0.0023 to 0.042 L mg−1 min−1 by the temperature increase. This could be illustrated by the increase of hydroxyl radicals yield by increasing temperature [42]. Moreover, the reaction half-time, t1/2 [43], is affected also by the temperature increase.
Table 1

Kinetic parameters of MB photodegradation by nano-Fenton’s reagent under various temperatures

T/°C

Pseudo-zero order

Pseudo-first order

Pseudo-second order

% Removal

k0/min−1

t1/2/min

R 2

k1/mg L−1 min−1

t1/2/min

R 2

k2/mg−1 L min−1

t1/2/min

R 2

25

0.089

0.45

0.76

0.014

49.50

0.88

0.0023

43.48

0.94

62.0

40

0.092

0.46

0.76

0.015

46.51

0.86

0.0026

38.46

0.93

96.0

50

0.129

0.63

0.51

0.044

15.64

0.61

0.0346

2.89

0.82

96.7

Ultimately, it is concluded that MB removal by nano-Fenton’s reagent is following the second-order reaction model under various investigated temperatures. This findings in accordance with Samet et al. [44], El Haddad et al. [6] and Youssef et al. [45] in the treatment of contaminated wastewater. However, Bounab et al. [41] found the reaction follows the first-order kinetics on the treatment using electro-Fenton treatment process.

To further understand the nano-Fenton’s reagent on MB degradation, thermodynamic parameters were estimated. In this point, activation energy (Ea) of MB degradation can be calculated from the Arrhenius equation [46, 47] \((k_{2} = A{\text{e}}^{{\frac{{ - E_{\text{a}} }}{RT}}} )\), where R is the gas constant, T is the temperature, and A is the pre-exponential factor that is considered to be constant with respect to temperature. Plotting \(\ln \,k_{2}\) versus 1/T gives a straight line whose slope is \(- E_{\text{a}} /R\). Figure 7 shows such a relation for the MB photodegradation process under the investigated temperatures. The obtained activation energy of the process was found to be 79.01 KJ mol−1. Additional thermodynamic parameters such as the enthalpy of activation (∆H′), the entropy of activation (∆S′) and the free energy of activation (∆G′) [47] were estimated and are listed in Table 2. The positive values of ∆H′ throughout this investigation indicate that reaction is exothermic. Besides, ∆G′ exhibited positive values; this means at high temperature the reaction is non-spontaneous with a negative entropy of activation [47].
Fig. 7

Plot of ln k2 versus 1000/T for the investigated photodegradation reaction. The solid lines represent least-squares fitting

Table 2

Thermodynamic parameters of MB photodegradation by nano-Fenton’s reagent

T/°C

ln k2

Ea/kJ mol−1

G′/kJ mol−1

H′/kJ mol−1

S′/J mol−1

25

− 6.07

 

88.03

48.79

− 131.68

40

− 5.95

79.01

92.27

48.67

− 139.31

50

− 3.36

 

88.35

48.59

− 123.12

4 Conclusion

Haematite nanocrystalline powder can be readily prepared using sol–gel technique. NHFR is achieved by applying haematite nanoparticles rich in hydrogen peroxide shows high efficiency in MB degradation. Furthermore, the effect of reaction Fenton’s reagent parameters such as pH effect, Fe3+ and hydrogen peroxide concentrations is achieved. The optimum pH value has been found to be 3, while the reaction rate increased with increases in the Fe3+ and hydrogen peroxide reagent doses until a certain limit of 40 and 400 mg/L, respectively. The effect of initial MB, flow rate and temperature was also monitored. The obtained results of the investigated NHFR confirm the important role of nanoparticles in photo-oxidation of organic pollutants. Moreover, the study of photo-oxidation reaction under various temperatures referred to that the reaction is non-spontaneous and the used reagent could be more efficient under direct solar radiation.

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Advanced Materials/Solar Energy and Environmental Sustainability (AMSEES) Laboratory, Basic Engineering Science Department, Faculty of EngineeringMenoufia UniversityShebin El-KomEgypt
  2. 2.Chemical Engineering Department, Faculty of EngineeringMinia UniversityMiniaEgypt

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