摘要
以棉花秸秆作为前驱体,用K_(2)CO_(3)活化后制备出改性生物质炭K_(2)CO_(3)@BC,置于FeSO_(4)溶液中形成悬浮液,干燥并煅烧,制得改性生物质炭负载铁催化剂Fe/K_(2)CO_(3)@BC。采用XRD、FT-IR、SEM等对Fe/K_(2)CO_(3)@BC进行表征,并研究其耐酸耐碱性。以亚甲基蓝作为目标污染物,将Fe/K_(2)CO_(3)@BC催化剂和H_(2)O_(2)组成非均相类Fenton体系降解水中的亚甲基蓝,探究了溶液pH、Fe/K_(2)CO_(3)@BC投加量、H_(2)O_(2)用量、温度等因素对亚甲基蓝降解效果的影响。结果表明,催化剂Fe/K_(2)CO_(3)@BC中的Fe物种主要以Fe3O4形式存在,具有一定的耐酸耐碱性,稳定性好。Fe/K_(2)CO_(3)@BC-H_(2)O_(2)类Fenton系统可高效催化降解水中的亚甲基蓝,且H_(2)O_(2)用量少,体系pH适应范围广。催化剂循环使用5次后,对亚甲基蓝的去除率仍达到85%以上。动力学研究表明该降解过程符合准二级动力学方程,证明亚甲基蓝的去除是由Fe/K_(2)CO_(3)@BC-H_(2)O_(2)体系中的氧化还原反应决定的。催化剂活化H_(2)O_(2)分子,产生羟基自由基,是高效降解亚甲基蓝的主要原因。
The modified bio-char K_(2)CO_(3)@BC was prepared by activating cotton straw as a precursor with K_(2)CO_(3),placed in FeSO_(4) solution to form a suspension.After drying,it was calcined to prepare the modified bio-char catalyst Fe/K_(2)CO_(3)@BC loaded iron.XRD,FT-IR and SEM were used to characterize Fe/K_(2)CO_(3)@BC and to study its acid and alkaline resistance.Using methylene blue as the target pollutant,the heterogeneous Fenton-like system composed of Fe/K_(2)CO_(3)@BC and H_(2)O_(2)was used to degrade methylene blue in water.The effects of pH,Fe/K_(2)CO_(3)@BC dosage,H_(2)O_(2)dosage,temperature and other factors on the degradation of methylene blue were investigated.The results showed that the Fe species in Fe/K_(2)CO_(3)@BC mainly existed in the form of Fe3O4,which had certain acid and alkali resistance and good stability.Fe/K_(2)CO_(3)@BC-H_(2)O_(2)Fenton-like system could catalyze the degradation of methylene blue in water with high efficiency,and the amount of H_(2)O_(2)was small,the pH of the system had a wide range of adaptability.The removal rate of methylene blue still reached more than 85%after five cycles of catalyst use.The kinetic study showed that the degradation process conformed to the quasi-secondary kinetic equation,which proved that the removal of methylene blue was determined by the redox reaction in the Fe/K_(2)CO_(3)@BC-H_(2)O_(2)system.The activation of H_(2)O_(2)molecules by the catalyst and the generation of hydroxyl radicals were the main reasons for the efficient degradation of methylene blue.
作者
杨鑫宇
符爱东
武向前
沈国涛
方翔
赵俭波
YANG Xinyu;FU Aidong;WU Xiangqian;SHEN Guotao;FANG Xiang;ZHAO Jianbo(College of Chemistry and Chemical Engineering,Tarim University,Alar 843300,China;Engineering Laboratory of Chemical Resources Utilization in South Xinjiang,Xinjiang Production&Construction Corps,Alar 843300,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第4期98-104,共7页
Industrial Water Treatment
基金
兵团财政科技计划(2022DB025)
国家自然科学基金(21865026)
塔里木大学校长基金项目(TDZKSS202127)。
