基于活性污泥焚灰的类Fenton催化剂的制备及其对亚甲基蓝的降解性能  

Activated Sludge Incineration Ash Derived Fenton-like Catalyst:Preparation and Degradation Performance on Methylene Blue

作　　者：蔡梦宇 李杨虹淼 杨彩云 周雨婷 吴昊 CAI Mengyu;LI-YANG Hongmiao;YANG Caiyun;ZHOU Yuting;WU Hao(Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse,School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学环境与化学工程学院,河北省水体重金属深度修复与资源利用重点实验室,秦皇岛066004

出　　处：《无机材料学报》2024年第10期1135-1142,I0004,I0005,共10页Journal of Inorganic Materials

基　　金：河北省自然科学基金(B2024203014);河北省引进留学人员资助项目(C20230326);河北省中央引导地方科技发展资金(236Z3604G);秦皇岛市科学技术研究与发展计划(202101A268);燕山大学基础研究与创新培育项目(2021LGQN018)。

摘　　要：载铁沸石因其来源广泛、制备简便及环境毒性低等特点,被广泛用于催化类Fenton反应产生·OH,以高效处理有机污染物。然而,传统载铁沸石的制备成本高且Fe^(2+)再生困难,限制了其在催化类Fenton反应中的工业化应用。基于此,本研究以污水处理厂活性污泥焚烧处理后的灰分为原料,选择性回收其中的硅、铝和铁等元素。制备的Fe^(2+)-方钠石(FSD)可用于类Fenton反应活化过氧乙酸(PAA),以高效降解水溶液中的亚甲基蓝(MB)。结果表明:FSD可在较宽的pH范围内催化PAA生成·OH、^(1)O_(2)和R-O·等多种活性氧物种,进而通过羟基化或亚砜化途径催化降解MB。以0.5 mol/L Fe^(2+)制备的FSD用量为0.3 g/L,PAA浓度为0.3 mmol/L时,FSD/PAA体系可在20 min内完全降解40 mg/L MB。此外,FSD中的还原性硫组分可促进Fe^(2+)再生,维持其催化活性。且FSD/PAA体系可在不同水质和生活污水中高效降解多种污染物,具有性能优良和适用性广的优点。Fe@zeolite materials are widely applied in the production of·OH by catalyzing Fenton-like reactions for degradation of recalcitrant organic pollutants due to their comprehensive sources,simple preparation and low environmental impact.However,the high cost of Fe@zeolite synthesis and the lack of Fe^(2+)regeneration strategy are serious issues that limit the application of Fe@zeolite as a Fenton-like catalyst in industrial-scale systems.In this study,the ash generated from activated sludge incineration treatment was utilized as raw material to selective recover Si,Al and Fe,preparing Fe^(2+)-sodalite(FSD)material.Consequently,it was used as a Fenton-like catalyst to activate peroxyacetic acid(PAA)for the degradation of methylene blue(MB)in wastewater.Results indicated thatFSD was capable of effectively catalyzing PAA to generate various active oxygen species such as·OH,^(1)O_(2) and R-O·in a wide pH range,thereby degrading MB through hydroxylation and sulfonation pathways.MB can be completely removed during 20 min under optimized conditions of 0.3 mmol/L PAA and 0.3 g/L FSD prepared with 0.5 mol/L Fe^(2+).In addition,the reductive S species in FSD can maintain its catalytical activity by enhancing Fe^(2+)regeneration,and the FSD/PAA system has been proven to be effective in the degradation of various organic pollutants under practical and complex environmental conditions.

关 键 词：活性污泥 方钠石 类Fenton降解 过氧乙酸 亚甲基蓝 

分 类 号：X705[环境科学与工程—环境工程]