邻苯二甲酸
邻苯二甲酸二甲酯
化学
邻苯二甲酸盐
增塑剂
邻苯二甲酸酐
甲酸
邻苯二甲酸二乙酯
降级(电信)
环境化学
总有机碳
核化学
有机化学
催化作用
计算机科学
电信
作者
Tiecheng Wang,Guangzhou Qu,Xianqiang Yin,Qiuhong Sun,Dong Liang,Xuetao Guo,Hanzhong Jia
标识
DOI:10.1016/j.jhazmat.2018.06.014
摘要
Plasticizer pollution brought huge risks to ecological environment and human health. Surface discharge plasma (SDP) was employed to eliminate plasticizer in natural water, with dimethyl phthalate (DMP) as a typical plasticizer. Experimental results showed that DMP degradation efficiency reached 82.8% within 60 min’s SDP treatment, and the elimination process fitted well the first-order kinetic model. Low initial DMP concentration, alkaline condition, and low natural organic matter content were all conducive for DMP degradation. The contributions of OH radical and O2− to DMP elimination were 91.9% and 78.1%, respectively. Total organic carbon (TOC), UV–vis spectroscopy, and atomic force microscopy analysis demonstrated that DMP molecular structure was destroyed after the SDP treatment, and some small molecular fractions were generated. Approximately 47.8% of TOC and 73.5% of COD were eliminated after 60 min’s SDP treatment. Phthalic acid monomethyl ester, phthalic acid, o-phthalic anhydride, acetic acid, formic acid, and oxalic acid were detected as the byproducts. Carbon balance analysis among these intermediates showed that total carbon content was approximately 4.64 × 10-2 mmol before treatment, and it was 4.578 × 10-2 mmol after treatment, suggesting that some C-containing intermediates still existed but not detected. DMP degradation pathways in the SDP system were proposed.
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