基于H_(2)O_(2)绿色合成的电化学高级氧化处理苯酚废水  

Treatment of phenol wastewater by electrochemical advanced oxidation based on H_(2)O_(2) green synthesis

作　　者：乔羽婕 李楠[1] 安敬昆 QIAO Yujie;LI Nan;AN Jingkun(School of Environmental Science and Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《工业水处理》2022年第6期79-84,共6页Industrial Water Treatment

基　　金：国家自然科学基金项目(52070140)。

摘　　要：H_(2)O_(2)因其安全高效的优势成为高级氧化技术中的常用氧化剂。在H_(2)O_(2)的众多合成方法中,电化学合成法是一种绿色环保的技术方法,但其生产过程中产生的废弃电解液存在污染环境的问题。本研究以可分解的NH_(4)HCO_(3)作为绿色电解液电化学原位合成H_(2)O_(2),考察了电流密度、反应器构型、电解液浓度对H_(2)O_(2)合成的影响,探究了NH_(4)HCO_(3)与Na_(2)SO_(4)电解液的差异性。结果表明,在电流密度为20 mA/cm^(2)、NH_(4)HCO_(3)电解液浓度为50 mmol/L时,单室、双室反应器可分别高效累积合成(237±2)mg/(L·h)和(327±2)mg/(L·h)的H_(2)O_(2)。同时本研究搭建了绿色高级氧化苯酚处理系统,利用UV催化在NH_(4)HCO_(3)电化学体系中原位合成的H_(2)O_(2)快速产生·OH,进而高效降解苯酚。结果表明,在低功率UV条件下,该系统单室反应器可在120 min内快速完全降解废水中的苯酚。H_(2)O_(2)is a common oxidant in advanced oxidation technology due to its high efficiency and safety advan⁃tages.Among the many synthesis methods of H_(2)O_(2),the electrochemical synthesis of H_(2)O_(2)is a green and environmen⁃tally friendly technology,but the waste electrolyte in the production process causes environmental pollution.In this work,decomposable NH_(4)HCO_(3)was used as the electrolyte to in situ synthesize H_(2)O_(2)electrochemically.Meanwhile,the effects of current density,reactor configuration and electrolyte concentration on the synthesis of H_(2)O_(2)were inves⁃tigated,and the differences between NH_(4)HCO_(3)and Na_(2)SO_(4)electrolytes were explored.The results showed that when the electrolyte concentration was 50 mmol/L,(237±2)mg/(L·h)and(327±2)mg/(L·h)H_(2)O_(2)were synthesized re⁃spectively in the single-chamber and double-chamber reactors at 20 mA/cm2.At the same time,a green advanced oxidized phenol degradation system was built,UV was used to rapidly catalyze H_(2)O_(2)to generate·OH for degradation of phenol.The results showed that phenol could be degraded rapidly and completely in a single chamber reactor within 120 min under low power UV condition.

关 键 词：高级氧化 过氧化氢 NH_(4)HCO_(3)电解液 苯酚废水 

分 类 号：X703.1[环境科学与工程—环境工程]