摘要
采用过硫酸盐-氧气(K_(2)S_(2)O_(8)-O_(2))耦合技术处理苯并噻唑(BTH)、苯并三唑(BT)、苯并咪唑(BM)、吲哚(ID) 4种苯并杂环混合物的模拟废水。160℃时,1.0 g/L的BTH、BT、BM、ID及混合污染物转化为球形聚合物的产率分别为66%、62%、57%、60%及68%,溶液中COD去除率分别为92%、90%、86%、91%及94%;进一步提高反应温度,几种污染物溶液的COD脱除率均达90%以上。利用密度泛函(DFT)理论对反应物分子结构、化学键长及其电负性进行了研究,结果表明,键长越长的反应物,其生成的聚合物微球尺寸越大;电负性越大,反应活性越高,越有利于COD去除。苯并杂环类污染物降解后生成的聚合物经碳化处理后转化为碳材料,可用于催化过硫酸盐氧化去除苯酚。相比不加催化剂体系,N、S共掺杂碳材料(BTH碳材料)对苯酚的去除率提高了将近48%,N掺杂碳材料(BM、BT碳材料)对苯酚的去除率达到40%以上,且3轮循环使用后各掺杂碳材料活性仅有小幅改变。因此,K_(2)S_(2)O_(8)-O_(2)耦合技术处理有机废水尤其是杂环有机废水具有显著优势,可同时实现碳资源循环利用和COD去除双重目的。
Benzothiazole(BTH),benzotriazole(BT),benzimidazole(BM)and indole(ID)and their mixture were se-lected as model pollutants and treated by persulfate-oxygen combined technology.The production of micropolymers were 66%,62%,57%,60%and 68%,corresponding to BTH,BT,BM,ID and their mixture with the concentration of 1.0 g/L at 160℃.Simultaneously,the COD removal efficiency were 92%,90%,86%,91%and 94%respectively.Furthermore,all the COD removal efficiency could be up 90%when the reaction temperature increased.Density functional(DFT)theory was used to study the molecular structure,chemical bond length and electronegativity of reactants.The results showed that the longer average bond lengths resulted in bigger microspheres and higher elec-tronegativity which led to higher reactivity and in favor of COD removal.The microsphere polymer produced after the degradation of heterocyclic pollutants was carbonized and converted into doped carbon material,which was used to catalyze the oxidation of persulfate to remove phenol.Compared to the system without catalyst,N&S co-doped car-bon catalysts(BTH carbon material)showed the best promotion effects,with 48%growth of COD removal,while N doped carbon catalysts(BM and BT carbon material)had about 40%removal rate of phenol.After three cyclical tests,carbon catalysts showed a slight passivation of their activities.Persulfate-oxygen combination technology had great advantage in organic wastewater treatment,especially in heterocyclic organic wastewater,and could simultane-ously achieve the dual purposes of carbon recycling and COD removal.
作者
周林碧
郝围围
王辉
ZHOU Linbi;HAO Weiwei;WANG Hui(Sinopec Research Institute of Petroleum Processing Company Limited,Beijing 100083,China;CNPC Engineering Technology R&D Company Limited,Beijing 102206,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第6期74-80,共7页
Industrial Water Treatment
基金
国家自然科学基金资助项目(52100110)。
关键词
苯并杂环
过硫酸盐氧化
微球聚合物
污水处理
苯酚
heterocyclic organics
persulfate oxidation
microsphere polymers
wastewater treatment
phenol
