聚乙烯醇对Fenton体系降解印染废水中对硝基苯酚的影响机制  

Effect of Polyvinyl Alcohol on the Degradation of p-Nitrophenol in Printing and Dyeing Wastewater by Fenton System

作　　者：孙安然 潘航 沈忱思[1] Sun Anran;Pan Hang;Shen Chensi(Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学,上海201620

出　　处：《广东化工》2025年第2期45-49,共5页Guangdong Chemical Industry

基　　金：上海市自然科学基金(21ZR1401500);中央高校基金(2232023G-11)。

摘　　要：以高级氧化技术为主的深度处理是印染废水向环境排放前的最后一道防线,研究其中典型类别难降解有机污染物之间的相互作用机制对于提升处理效率至关重要。据此,本研究选取来源于前处理工段的聚乙烯醇(PVA)代表典型难降解高分子污染物,以对硝基苯酚(4-NP)代表来源于染色工段的芳香类污染物,考察PVA对Fenton体系降解4-NP的影响机制。结果表明,PVA共存虽然对4-NP的去除率影响较小,但显著减少了苯甲酸等芳香类降解产物的残留,减少了相应的环境风险。电子顺磁共振谱等研究表明,PVA被自由基引发产生后会参与到一系列的自由基链式反应中,其结构中丰富的-OH基团,会促进·OH、HO_(2)·、^(1)O_(2)及H_(2)O_(2)等氧化活性物种的产生,使具备强氧化性的·OH和^(1)O_(2)积累增强,促使4-NP的降解更为彻底。降解产物的分析及Fenton反应用中自由基产生情况的探索结果,有望为印染废水的协同处理策略提供基础支撑。Advanced treatment based on advanced oxidation technology is the last line of defense before the discharge of printing and dyeing wastewater to the environment.It is very important to study the interaction mechanism between typical types of refractory organic pollutants to improve the treatment efficiency.Therefore,this study selects polyvinyl alcohol(PVA)from the pre-treatment section to represent typical refractory polymer pollutants,and p-nitrophenol(4-NP)to represent aromatic pollutants from the dyeing section to investigate the influence mechanism of PVA on the degradation of 4-NP in Fenton system.The results showed that although the coexistence of PVA had little effect on the removal rate of 4-NP,the residues of aromatic degradation products such as benzoic acid was significantly reduced,and the corresponding environmental risks were reduced.Studies by electron para-magnetic resonance spectroscopy and others have shown that PVA will participate in a series of free radical chain reactions after being triggered by free radicals,and the abundant-OH groups in its structure will promote the generation of oxidation active species such as·OH,HO_(2)·,^(1)O_(2) and H_(2)O_(2),so that the accumulation of strong oxidizing·OH and ^(1)O_(2) will be enhanced,and the degradation of 4-NP will be more thorough.The analysis of degradation products and the exploration results of free radical production in Fenton reaction are expected to provide basic support for the collaborative treatment strategy of printing and dyeing wastewater.

关 键 词：聚乙烯醇 FENTON 对硝基苯酚 自由基 降解产物 

分 类 号：TQ031.7[化学工程]