UV/H_(2)O_(2)氧化降解废水中氨基三亚甲基膦酸性能及机理  

Performance and mechanism of UV/H_(2)O_(2)synergistic system on oxidation and degradation of amino trimethylene phosphonic acid

作　　者：任帅康 黎佳茜 刘丹妮[1] 廖海清[1] 刘雪瑜[1] 张娟娟 REN Shuaikang;LI Jiaxi;LIU Danni;LIAO Haiqing;LIU Xueyu;ZHANG Juanjuan(Institute of Water Ecology and Environmental,Chinese Research Academy of Environmental Sciences,Beijing 100012)

机构地区：[1]中国环境科学研究院,水生态环境研究所,北京100012

出　　处：《环境工程学报》2024年第9期2483-2490,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年科学基金资助项目(22106173);生态环境部预算内工作专项(102144220260000009095)。

摘　　要：本研究构建了以185 nm紫外光(ultraviolet,UV)为光源的UV活化过氧化氢(H_(2)O_(2))体系(UV/H_(2)O_(2)),对工业废水中阻垢剂氨基三亚甲基膦酸(amino trimethylene phosphonic acid,ATMP)进行氧化降解。比较了UV、H_(2)O_(2)及UV/H_(2)O_(2)体系对ATMP的氧化降解效果。结果表明,UV/H_(2)O_(2)体系表现出较优的处理效果,ATMP被有效氧化降解为正磷酸盐(orthophosphate,PO_(4)^(3−))。考察了UV波长、溶液初始pH、H_(2)O_(2)浓度、反应温度、共存底物(SO_(4)^(2−)、Cl^(−)、NO_(3)^(−)、CH3COO−和腐殖酸(HA))对反应体系氧化ATMP为PO_(4)^(3−)效率的影响。结果表明,室温条件下,初始浓度为0.1 mmol·L^(−1)的ATMP(其中P浓度为0.3 mmol·L^(−1))在UV 185 nm照射下,H_(2)O_(2)投加量为5.0 mmol·L^(−1),初始溶液pH为7.0时,反应90 min后,体系PO_(4)^(3−)生成量可达0.24 mmol·L^(−1),对应的ATMP去除率为80%。共存底物SO_(4)^(2−)、Cl^(−)在较高浓度(>10.0 mmol·L^(−1))时对AMTP的氧化降解存在促进作用。共存底物NO_(3)^(−)、CH3COO−和HA对ATMP的氧化降解存在抑制作用,且这种抑制作用随其浓度增加而逐步增强。进一步研究了UV/H_(2)O_(2)体系氧化降解ATMP的反应机制。自由基淬灭实验证明,羟基自由基(·OH)是体系中氧化ATMP的主要活性物种,电子自旋共振波谱测试(ESR)分析结果进一步证明了这一点。以上研究结果可为含ATMP废水的处理提供参考。In this study,an ultraviolet(UV)activated hydrogen peroxide(H_(2)O_(2))system(UV/H_(2)O_(2))with UV 185 nm as the light source was constructed to oxidize and degrade the scale inhibitor of amino trimethyl phosphonic acid(ATMP)in industrial wastewater.The oxidation and degradation of ATMP by UV,H_(2)O_(2),and UV/H_(2)O_(2)synergistic system were compared.The results showed that the UV/H_(2)O_(2)system had a good performance on ATMP treatment and could effectively oxidize it to PO_(4)^(3−).The effects of UV wavelength,initial solution pH value,H_(2)O_(2)concentration,reaction temperature,and coexisting substrates(SO_(4)^(2−),Cl^(−),NO_(3)^(−),CH3COO−,and humic acid(HA))on the oxidation efficiency of ATMP to PO_(4)^(3−)were investigated.The results indicated that when the initial concentration of ATMP was 0.1 mmol·L^(−1),the dosage of H_(2)O_(2)was 5.0 mmol·L^(−1),and the initial solution pH was 7.0,UV/H_(2)O_(2)synergistic system could lead to the production of 0.24 mmol·L^(−1)PO_(4)^(3−),as well as 80%ATMP removal at ambient temperature and 90 min reaction.Coexisting substrates of SO_(4)^(2−)and Cl^(−)had a promoting effect on the oxidation of AMTP at high concentrations(>10.0 mmol·L^(−1)).Coexisting substrates of NO_(3)^(−),CH_(3)COO^(−),and HA had inhibitory effects on the oxidation of ATMP,and this inhibitory effect gradually increased with increasing concentration.Furthermore,the reaction mechanism of UV/H_(2)O_(2)oxidation of ATMP was studied.The radical quenching experiments proved that hydroxyl radicals(·OH)were the main active species for the oxidation of ATMP in the UV/H_(2)O_(2)system,which was further confirmed by the analysis results of electron spin resonance(ESR)spectroscopy.The above research results can provide a reference for the treatment of wastewater containing ATMP.

关 键 词：紫外光 过氧化氢 氨基三亚甲基膦酸 羟基自由基 正磷酸盐 

分 类 号：X703[环境科学与工程—环境工程]