Effective degradation of Reactive Red 195 via heterogeneous electro-Fenton treatment: theoretical study and optimization
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The magnetite (Fe3O4) nanoparticles were synthesized and supported on the reduced graphene oxide. The characterization of the catalyst was performed by FT-IR, VSM, SEM, XRD, and BET techniques. The obtained results indicated that the in situ synthesis of Fe3O4 using coprecipitation method caused the homogenous formation of magnetite nanoparticles on the surface of reduced graphene oxide (average particle size ~ 71.032 nm) with high stability and catalytic activity toward electro-Fenton removal of Reactive Red 195. The effect of various factors (current intensity, initial pollutant concentration, catalyst weight, and pH) was evaluated by response surface methodology using central composite design. The analysis of variance exhibited that the experimental data are in accordance with the quadratic model. At the optimized operation condition (current intensity of 194.96 mA, initial RR195 concentration of 168.43 mg L−1, 2.0 mg catalyst at pH 3.04), the RR195 and COD removals reached 93.34% and 75.27% in 60 min, respectively. The DFT simulation was performed at B3LYP level of theory. The HOMO–LUMO energy gap was reduced from 2.536 to 2.514 eV after supporting of Fe3O4 on the reduced graphene oxide, which demonstrated the higher electrical conductivity. The RR195 removal followed pseudo-first-order kinetics model (k = 0.044 min−1, R2 = 0.9938). The stability of the catalyst against leaching was evaluated, and only 2.4% of iron was leached. The catalyst almost remained efficient after six cycles.
KeywordsDensity functional theory Electrochemical advanced oxidation processes Electro-Fenton Kinetics Response surface methodology
The authors are thankful to the chemistry department of Sharif University of Technology for financial support.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Ali I, Gupta VK, Khan TA, Asim M (2012a) Removal of arsenate from aqueous solution by electro-coagulation method using Al–Fe electrodes. Int J Electrochem Sci 7:1898–1907Google Scholar
- Barhoumi N, Olvera-Vargas H, Oturan N, Huguenot D, Gadri A, Ammar S, Brillas E, Oturan MA (2017) Kinetics of oxidative degradation/mineralization pathways of the antibiotic tetracycline by the novel heterogeneous electro-Fenton process with solid catalyst chalcopyrite. Appl Catal B 209:637–647CrossRefGoogle Scholar
- Clesceri LS, Grenberg AE, Eaton AD (1998) Standard methods for examination of water and wastewater. American Public Health Association/Water Environment Federation, Washington, DCGoogle Scholar
- Gnanasekaran L, Hemamalini R, Saravanan R, Ravichandran K, Gracia F, Agarwal S, Gupta VK (2017) Synthesis and characterization of metal oxides (CeO2, CuO, NiO, Mn3O4, SnO2 and ZnO) nanoparticles as photo catalysts for degradation of textile dyes. J Photochem Photobiol B 173:43–49CrossRefGoogle Scholar
- Gupta VK, Ali I (2002) Encyclopedia of surface and colloid science. In: Hubbard AT (ed) Adsorbents for water treatment: low-cost alternatives to carbon, 2nd edn. Marcel Dekker, New York, pp 136–166Google Scholar
- Gupta VK, Ali I (2013) Environmental water: advances in treatment, remediation and recycling. Newnes, Oxford and BostonGoogle Scholar
- Lan H, He W, Wang A, Liu R, Liu H, Qu J, Huang CP (2016) An activated carbon fiber cathode for the degradation of glyphosate in aqueous solutions by the electro-Fenton mode: optimal operational conditions and the deposition of iron on cathode on electrode reusability. Water Res 105:575–582CrossRefGoogle Scholar
- Peng Z, Yu Z, Wang L, Liu Y, Xiang G, Chen Y, Sun L, Huang J (2016) Synthesis of Fe2O3/TiO2 nanotube and its application in photoelectrocatalytic/photoelectro-Fenton decolorization of rhodamine B. J Adv Oxid Technol 19(1):34–42Google Scholar
- Sharma S, Khan T, Imran ALI (2011) Adsorption of Rhodamine B dye from aqueous solution onto acid activated mango (Magnifera indica) leaf powder: equilibrium, kinetic and thermodynamic studies. J Toxicol Environ Health Sci 3(10):286–297Google Scholar
- Singh K, Ohlan A, Pham VH, Balasubramaniyan R, Varshney S, Jang J, Hur H, Choi WM, Kumar M, Dhawan SK, Kongd B, Chung JS, Kong BS (2013) Nanostructured graphene/Fe3O4 incorporated polyaniline as a high performance shield against electromagnetic pollution. Nanoscale 5(6):2411–2420CrossRefGoogle Scholar
- Suhail M, Ali I (2017) Advanced spiral periodic classification of the elements. Chem Int 3:220–224Google Scholar
- Trellu C, Pechaud Y, Oturan N, Mousset E, Huguenot D, Van Hullebusch ED, Esposito G, Oturan MA (2016) Comparative study on the removal of humic acids from drinking water by anodic oxidation and electro-Fenton processes: mineralization efficiency and modelling. Appl Catal B 194:32–41CrossRefGoogle Scholar