Removal of Hg2+ and methylmercury in waters by functionalized multi-walled carbon nanotubes: adsorption behavior and the impacts of some environmentally relevant factors

Q3 Chemical Engineering

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI:10.1080/09542299.2017.1378596

Dan Zhang, Yongguang Yin, Jing-fu Liu

引用次数: 14

Abstract

Abstract Adsorption of Hg2+ and methylmercury (MeHg) to multi-walled carbon nanotubes (MWCNTs) modified, respectively, with hydroxyl, amine and carboxyl groups was studied. The effect of various factors like the initial pH, natural organic matter (NOM), Cl- and adsorbent dose on the sorption efficiency were evaluated. It was found that amine-modified MWCNTs showed a strong adsorption capacity to Hg2+ and MeHg, and the removal efficiency could reach up to 92% (0.5 g/L MWCNTs, and 100 μg/L Hg2+ and MeHg) which is independent of pH. NOM had complex effects on the adsorption of Hg2+ and MeHg to MWCNTs. Cl- inhibited the adsorption of Hg2+ and MeHg to MWCNTs. The adsorption of Hg2+ and MeHg was found to be inhomogeneous and homogeneous chemisorption, respectively. Our results suggested that MWCNTs modified with different functional groups can efficiently adsorb both Hg2+ and MeHg in aqueous environment.

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功能化多壁碳纳米管去除水中Hg2+和甲基汞:吸附行为及环境相关因素的影响

摘要研究了羟基、胺基和羧基修饰的多壁碳纳米管对Hg2+和甲基汞的吸附。评价了初始pH、天然有机物（NOM）、Cl-和吸附剂用量等因素对吸附效率的影响。研究发现，胺改性的多壁碳纳米管对Hg2+和甲基汞具有较强的吸附能力，去除率可达92%（0.5g/L的多壁炭纳米管和100μg/L的Hg2+及甲基汞），与pH无关。Cl-抑制了Hg2+和甲基汞在MWCNT上的吸附。Hg2+和甲基汞的吸附分别是不均匀和均匀的化学吸附。我们的结果表明，用不同官能团修饰的MWCNT可以有效地吸附水环境中的Hg2+和甲基汞。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Speciation and Bioavailability 环境科学-毒理学

CiteScore

1.62

自引率

0.00%

发文量

审稿时长

1 months

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