工业水处理 ›› 2024, Vol. 44 ›› Issue (5): 120-131. doi: 10.19965/j.cnki.iwt.2023-0495

• 试验研究 • 上一篇    下一篇

双子羧酸型甜菜碱改性黏土对染料的吸附性能研究

金鑫1,2(), 赵清1, 丁璠1, 毛珊珊1, 高芒来1()   

  1. 1. 中国石油大学(北京)理学院,北京 102200
    2. 吉林农业科技学院生物与制药工程学院,吉林 吉林 132101
  • 收稿日期:2024-03-21 出版日期:2024-05-20 发布日期:2024-05-21
  • 作者简介:

    金鑫(1984— ),博士研究生。E-mail:

    高芒来,博士,教授。E-mail:

  • 基金资助:
    国家自然科学基金项目(21776306)

Study on adsorption performance of gemini carboxylic betaine modified clay for dyes

Xin JIN1,2(), Qing ZHAO1, Fan DING1, Shanshan MAO1, Manglai GAO1()   

  1. 1. College of Science, China University of Petroleum-Beijing, Beijing 102200, China
    2. College of Biological and Pharmaceutical Engineering, Jilin University of Agricultural Science and Technology, Jilin 132101, China
  • Received:2024-03-21 Online:2024-05-20 Published:2024-05-21

摘要:

为增强黏土材料对有机污染物的吸附,以双子羧酸型甜菜碱表面活性剂〔1,2-双(N-甲基-N-羧甲基-十四烷基铵)乙烷,MCTA〕为改性剂,改性了蛭石(Vt)和二氧化硅纳米片层(SL),制得两种有机黏土吸附剂MCTA-Vt与MCTA-SL。以染料柯依定(CG)为吸附质,考察了改性剂投加量、反应时间、初始pH、染料浓度、温度等因素对吸附性能的影响。结果表明,改性后的MCTA-Vt和MCTA-SL对CG的最大吸附量分别为131.13 mg/g和58.14 mg/g,相较于未改性的Vt和SL(23.70 mg/g和10.56 mg/g),吸附量有了大幅提升。吸附机理包括烷基链的疏水相互作用、羧基官能团的静电相互作用和分子轨道间的电子转移作用。采用双子羧基型甜菜碱作为改性剂,既可以为黏土提供疏水长链,改善其疏水性,增加其对有机污染物的吸附能力,又能够赋予黏土N+阳离子和—COO-阴离子官能团作为新的吸附位点,进而提高黏土的吸附能力。

关键词: 双子羧酸型甜菜碱, 蛭石, 二氧化硅纳米片层, 柯依定, 吸附性能

Abstract:

To enhance the adsorption of organic pollutants by clay materials, two types of organic clay adsorbents were prepared by modifying vermiculite(Vt) and silica lamella(SL) with gemini carboxylic betaine〔1, 2-bis(N-methyl-N-carboxymethyl-tetradecylammonium)ethane, MCTA〕 surfactant as modifier. The effects of modifier addition, contact time, initial pH, dye concentration, and temperature on the adsorption performance were investigated using chrysoidine G(CG) as the adsorbent. The results showed that compared with unmodified Vt and SL(23.70 mg/g and 10.56 mg/g), the adsorption capacities of modified MCTA-Vt and MCTA-SL for CG(131.13 mg/g and 58.14 mg/g) were significantly increased. The adsorption mechanism included hydrophobic interactions of alkyl chains,electrostatic interaction of carboxyl functional groups and electron transfer between molecular orbitals. It was shown that using MCTA as modifier could not only provide hydrophobic long chains for clay to improve its hydrophobicity and increase its adsorption capacity for organic pollutants, but also endow clay with N+ cations and —COO- anion functional groups as new adsorption sites, thereby improving the adsorption capacity of clay.

Key words: gemini carboxylic betaine, vermiculite, silica lamella, chrysoidine G, adsorption performance

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