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Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

利用TiO2/H2O2在可见/近红外光照射下热辅助光催化降解木素

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Abstract

As a bio-recalcitrant organic pollutant in paper mill effluent, lignin is generally removed by an advanced oxidation process, such as a TiO2/H2O2 photocatalytic technique under irradiation with ultraviolet light, which only accounts for less than 5% of sunlight. Herein, we reported a TiO2/H2O2-based thermally-assisted photocatalytic process that allows lignin to be efficiently degraded under visible/near-infrared light at an elevated temperature. Adsorption of H2O2 on TiO2 nanoparticles and an increase of temperature facilitate the production and separation of charge carriers under near-infrared and visible light irradiation, accelerate carrier transfer at the TiO2-electrolyte interface and promote the production of hydroxyl radicals. A higher level of H2O2 addition results in an increased degradation rate of lignin, while the optimal temperature for the thermally-assisted photodegradation of lignin is 70°C. A charge carrier excitation and transfer process was proposed for the TiO2/H2O2 thermally-assisted photocatalytic process. This work describes a new method for the photodegradation of organic pollutants, such as residual lignin in paper mill effluent, using wide band gap semiconductors under visible and near-infrared light irradiation.

摘要

木素是一种生物难降解有机物. 造纸工业废水中的木素通常利用诸如TiO2/H2O2紫外光催化技术之类的高级氧化技术去除, 但紫外光在太阳光中的份额不足5%. 本文提出了一种TiO2/H2O2热辅助可见/近红外光催化技术, 利用该技术可在可见/近红外光照射下将木素有效地催化降解. H2O2在TiO2上的吸附及提高温度可促使光生电子在近红外光和可见光照射下向导带跃迁, 并与H2O2反应促进光生载流子的分离及羟基自由基的形成. 因此, 提高H2O2浓度和适当提高温度有助于提高木素的近红外光催化降解速率, 并在70°C时获得最大木素降解速率. 本文还根据实验与分析提出了TiO2/H2O2热辅助光催化体系降解木素时光生载流子的产生与传递机制.

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Acknowledgements

The project was funded by the National Natural Science Foundation of China (31270625).

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Authors and Affiliations

  1. Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education), Qilu University of Technology, Jinan, 250353, China

    Jun Chen  (陈 骏), Wenxia Liu  (刘温霞) & Zhenzhen Li  (李真真)

  2. State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China

    Hong Liu  (刘 宏)

Authors
  1. Jun Chen  (陈 骏)
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  2. Wenxia Liu  (刘温霞)
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  3. Zhenzhen Li  (李真真)
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  4. Hong Liu  (刘 宏)
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Corresponding author

Correspondence to Wenxia Liu  (刘温霞).

Additional information

Jun Chen received his bachelor degree in printing engineering from Qilu University of Technology in 2012. Now he is a Master candidate in pulp and paper engineering under the supervision of Professor Wenxia Liu at Qilu University of Technology. His research interests are related to the photocatalytic degradation of organic pollutant and controlled depolymerization of lignin.

Wenxia Liu received her bachelor and Master degrees in pulp and paper engineering from Shaanxi University of Science and Technology in 1985, 1988, respectively. She joined the Faculty of Pulp and Paper Engineering, Qilu University of Technology in 1988. In 2000, she received her doctoral degree in pulp and paper engineering from Tianjin University of Science and Technology. Her research interests focus on wet end chemistry, synthesis and application of nanomaterials in pulp and paper making industry.

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Chen, J., Liu, W., Li, Z. et al. Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation. Sci. China Mater. 61, 382–390 (2018). https://doi.org/10.1007/s40843-017-9176-8

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  • DOI: https://doi.org/10.1007/s40843-017-9176-8

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