期刊
RSC ADVANCES
卷 12, 期 39, 页码 25424-25432出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra04921j
关键词
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资金
- National Key Research and Development Program of China [2019YFC0408200]
- National Natural Science Foundation of China [51838009]
- Shanghai Sailing Program [22YF1450700]
In this study, a filtration-enhanced electro-Fenton system was developed to remove PTSA from industrial wastewater with high efficiency. The system showed lower effluent biological toxicity and operating cost.
Rapid global industrialization accompanies the discharge of industrial wastewater. p-Toluenesulfonic acid (PTSA), a kind of aromatic sulfonate that belongs to the refractory organic pollutant, is one of the most widely used chemicals in pharmaceutical, dye, petrochemical and plastic industries. In this study, we developed a filtration-enhanced electro-Fenton (FEEF) reactor to remove PTSA from synthetic wastewater. A filtration-enhanced stainless-steel mesh (FESSM) was used as the cathode. Under the optimal operating conditions of applied voltage 2.5 V, pH = 3.0, addition of 0.2 mM Fe2+ and 1.0 mM H2O2 for 120 min, the removal efficiency of PTSA (initial concentration of 100 mg L-1) could reach 92.6%. Compared with the control anodic oxidation and conventional Fenton system, the FEEF system showed higher OH yield and PTSA removal efficiency, with a lower effluent biological toxicity and operating cost. The enhanced mass transfer rate by the filtration in the FEEF system accelerated the regeneration of catalyst Fe2+ and further promoted the heterogeneous reactions. The Fe species on the surface of FESSM cathode possessed a gradient distribution, the inner layer was dominated by Fe and the outer layer was Fe3+. The degradation pathways of PTSA were proposed, including methyl hydroxylation, sulfonyl hydroxylation, beta-hydrogen hydroxylation, and ring-opening reaction. These results demonstrate that the novel FEEF system is a promising technology for the removal of refractory organic pollutants from industrial wastewater.
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