邻苯二甲酸和苯甲酸在功能化碳纳米管上的吸附行为

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摘要

在pH7.0的条件下，采用批量平衡方法研究邻苯二甲酸（PA）和苯甲酸（BA）在3种不同功能化碳纳米管（羟基化H-CNTs、羧基化C-CNTs和石墨化G-CNTs）上的吸附/解吸行为，并进一步探究共存BA对PA在碳纳米管上吸附的影响.结果表明，Langmuir和Freundlich模型均可对PA和BA在3种碳纳米管上的吸附数据进行较好的非线性拟合，其中Freundlich模型拟合效果更好（Adj r²均达到0.88以上）；3种碳纳米管对PA和BA的吸附能力大小均依次为：C-CNTs > H-CNTs > G-CNTs；解吸实验中，C-CNT和H-CNTs对BA和PA的解吸均具有明显的滞后现象，说明BA和PA在C-CNT和H-CNTs上的吸附有较强化学作用力的发生，而G-CNTs对二者的解吸曲线与吸附曲线几乎重合，不具有明显的滞后现象，这与G-CNTs表面缺乏官能团有关；当PA和BA共存在时，以PA为主要吸附质，BA为竞争吸附质，发现在H-CNTs和C-CNTs上，共存BA对PA为竞争作用，而在G-CNTs上，共存BA对PA起协同吸附作用.

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	张金龙
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	李小平

关键词 ：苯甲酸, 邻苯二甲酸, 碳纳米管, 吸附解吸, 共吸附

Abstract：

At pH 7.0, batch adsorption methods were employed to reveal the adsorption/desorption behaviors of phthalic acid (PA) and benzoic acid (BA) on three functionalized carbon nanotubes (H-CNTs, C-CNTs and G-CNTs), and further to explore the impact of co-existing BA on PA adsorption by CNTs. The results showed both of Langmuir and Freundlich models could well fit with all experimental data, and Freundlich model was better (Adj r² > 0.88). The adsorption affinities of PA and BA on three CNTs were in order C-CNTs > H-CNTs > G-CNTs. In this study, obvious adsorption/desorption hysteresis was observed for both PA and BA on C-CNTs and H-CNTs, but not for G-CNTs. It was indicated that the adsorption of BA and PA on C-CNTs and H-CNTs had a relatively intensified chemical interaction, but due to lacking of surface oxygen functional group, desorption hysteresis was not observed on G-CNTs. For the co-existing system, PA was selected as main adsorbate and BA was selected as competitive adsobate to investigate competitive adsorption between two different ionizable compounds. The results indicated that on H-CNTs and C-CNTs, coexisting BA played a competitive role in PA, while on G-CNTs, coexisting BA had a synergistic adsorption effect on PA.

Key words： benzoic acid phthalic acid carbon nanotubes adsorption and desorption synergistic adsorption

收稿日期: 2018-04-10

X523

基金资助:

国家自然科学基金资助项目（41703093，41471420）；中央高校项目（GK201803057，GK201802018，GK201701010）

通讯作者: 李霄云,副教授,lxy518@snnu.edu.cn E-mail: lxy518@snnu.edu.cn

作者简介: 张金龙(1996-),男,陕西榆林人,陕西师范大学地理科学与旅游学院环境科学系本科生,主要从事水资源利用与水污染控制研究.

引用本文:

张金龙, 李霄云, 包万鸿, 王玉如, 李小平. 邻苯二甲酸和苯甲酸在功能化碳纳米管上的吸附行为[J]. 中国环境科学, 2018, 38(11): 4106-4113. ZHANG Jin-long, LI Xiao-yun, BAO Wan-hong, WANG Yu-ru, LI Xiao-ping. Adsorption behaviors of phthalic acid and benzoic acid on functionalized carbon nanotubes. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(11): 4106-4113.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2018/V38/I11/4106

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