工业水处理 ›› 2023, Vol. 43 ›› Issue (4): 98-104. doi: 10.19965/j.cnki.iwt.2022-0561

• 试验研究 • 上一篇    下一篇

改性生物质炭负载铁类Fenton体系降解亚甲基蓝研究

杨鑫宇1,2(), 符爱东1, 武向前1, 沈国涛1, 方翔1, 赵俭波1,2()   

  1. 1.塔里木大学化学化工学院, 新疆 阿拉尔 843300
    2.新疆兵团南疆化工资源利用工程实验室, 新疆 阿拉尔 843300
  • 收稿日期:2023-03-16 出版日期:2023-04-20 发布日期:2023-05-23
  • 通讯作者: 赵俭波 E-mail:xyyang_1995@163.com;lain_1982@163.com
  • 作者简介:杨鑫宇(1995— ),讲师,硕士,E-mail:xyyang_1995@163.com
    赵俭波,教授,博士,E-mail:lain_1982@163.com
  • 基金资助:
    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)

Study on degradation of methylene blue by Fenton-like system with modified bio-char loaded with iron

Xinyu YANG1,2(), Aidong FU1, Xiangqian WU1, Guotao SHEN1, Xiang FANG1, Jianbo ZHAO1,2()   

  1. 1.College of Chemistry and Chemical Engineering,Tarim University,Alar 843300,China
    2.Engineering Laboratory of Chemical Resources Utilization in South Xinjiang,Xinjiang Production & Construction Corps,Alar 843300,China
  • Received:2023-03-16 Online:2023-04-20 Published:2023-05-23
  • Contact: Jianbo ZHAO E-mail:xyyang_1995@163.com;lain_1982@163.com

摘要:

以棉花秸秆作为前驱体,用K2CO3活化后制备出改性生物质炭K2CO3@BC,置于FeSO4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/K2CO3@BC。采用XRD、FT-IR、SEM等对Fe/K2CO3@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/K2CO3@BC催化剂和H2O2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/K2CO3@BC投加量、H2O2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/K2CO3@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/K2CO3@BC-H2O2类Fenton系统可高效催化降解水中的亚甲基蓝,且H2O2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/K2CO3@BC-H2O2体系中的氧化还原反应决定的。催化剂活化H2O2分子,产生羟基自由基,是高效降解亚甲基蓝的主要原因。

关键词: 生物质炭, Fenton, 亚甲基蓝, 降解

Abstract:

The modified bio-char K2CO3@BC was prepared by activating cotton straw as a precursor with K2CO3, placed in FeSO4 solution to form a suspension. After drying,it was calcined to prepare the modified bio-char catalyst Fe/K2CO3@BC loaded iron. XRD, FT-IR and SEM were used to characterize Fe/K2CO3@BC and to study its acid and alkaline resistance.Using methylene blue as the target pollutant, the heterogeneous Fenton-like system composed of Fe/K2CO3@BC and H2O2 was used to degrade methylene blue in water. The effects of pH, Fe/K2CO3@BC dosage, H2O2 dosage, temperature and other factors on the degradation of methylene blue were investigated. The results showed that the Fe species in Fe/K2CO3@BC mainly existed in the form of Fe3O4, which had certain acid and alkali resistance and good stability. Fe/K2CO3@BC-H2O2 Fenton-like system could catalyze the degradation of methylene blue in water with high efficiency, and the amount of H2O2 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/K2CO3@BC-H2O2 system. The activation of H2O2 molecules by the catalyst and the generation of hydroxyl radicals were the main reasons for the efficient degradation of methylene blue.

Key words: bio-char, Fenton, methylene blue, degradation

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