期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 1, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2020.104969
关键词
Anode modification; Electrocoagulation; Polypyrrole (PPy); Electroplating wastewater; Corrosion inhibition
资金
- National Key Research and Development Program of China [2017YFE9133400]
- National Natural Science Foundation of China [21806059]
- Natural Science Foundation of Jiangsu Province [BK20180634]
- Fundamental Research Funds for the Central Universities [JUSRP11941]
- Pre-research Fund of Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment [XTCXSZ2020-3]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX20_0769]
In this study, a PPy/PTS coated SS plate was used as a modified anode for the electrocoagulation treatment of electroplating wastewater, achieving high removal rates for zinc and nickel. The coating also showed good corrosion inhibition properties and could be characterized through various analytical techniques.
In this study, the stainless steel (SS) plate with polypyrrole (PPy) coating was adopted as a modified anode for the electrocoagulation (EC) treatment of electroplating wastewater. It was found that the PPy/PTS (Sodium ptoluene-sulfonate) coated anode could largely prevent the anodic corrosion. With the optimized EC operating parameters as initial pH at 4, EC process at 70 min and applied current density at 30 mA cm(-2), removal efficiency of zinc and nickel from the electroplating wastewater reached 99.9% and 80% respectively. In addition, corrosion inhibition efficiency attained 30% even after 10 repeated EC treatment batches. Furthermore, the successful electro-deposition of coatings with dopants could be characterized by FT-IR, SEM, EDX, and the smallest gaps between the peaks and valleys of PPy/PTS coating could be observed using AFM as well. Notably, PPy was found being adsorbed parallelly to the Fe (1 1 0) surface, whereas adsorption energy of PPy/PTS obtained from molecular dynamic simulation calculation reached the lowest as 88.87 kJ mol(-1) comparing to any other coating group. Therefore, it seemed that the PPy modified SS anode could achieve a relatively high heavy metal removal rate as well as a better protection, and accordingly would help lengthen the lifespan of the steel anode.
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