氨基复合铁氧化物对As（V）的吸附性能与机理

晋银佳; 陈享享; 王丰吉; 朱跃

doi:10.12030/j.cjee.201510065

环境工程学报

氨基复合铁氧化物对As（V）的吸附性能与机理

, , ,

晋银佳, 陈享享, 王丰吉, 朱跃. 氨基复合铁氧化物对As（V）的吸附性能与机理[J]. 环境工程学报, 2017, 11(4): 2025-2033. doi: 10.12030/j.cjee.201510065

引用本文:

晋银佳, 陈享享, 王丰吉, 朱跃. 氨基复合铁氧化物对As（V）的吸附性能与机理[J]. 环境工程学报, 2017, 11(4): 2025-2033. doi: 10.12030/j.cjee.201510065

JIN Yinjia, CHEN Xiangxiang, WANG Fengji, ZHU Yue. As(V) adsorption property and mechanism by amino-functionalized iron oxide nanomaterial[J]. Chinese Journal of Environmental Engineering, 2017, 11(4): 2025-2033. doi: 10.12030/j.cjee.201510065

Citation:

JIN Yinjia, CHEN Xiangxiang, WANG Fengji, ZHU Yue. As(V) adsorption property and mechanism by amino-functionalized iron oxide nanomaterial[J]. Chinese Journal of Environmental Engineering, 2017, 11(4): 2025-2033. doi: 10.12030/j.cjee.201510065

氨基复合铁氧化物对As（V）的吸附性能与机理

1.
华电电力科学研究院, 环保技术部, 杭州 310030
2.
东北大学资源与土木工程学院, 沈阳 110819
基金项目:
国家水体污染控制与治理科技重大专项（2010ZX07212-008）
中图分类号: X703.5

As(V) adsorption property and mechanism by amino-functionalized iron oxide nanomaterial

1.
Department of Environment Protection Technology, Huadian Electric Power Research Institute, Hangzhou 310030, China
2.
College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Fund Project:

摘要: 用氯化十六烷基三甲铵（Cetyltrimethylammonium chloride，CTAC）修饰铁氧化物Fe2O3，得到氨基复合的铁氧化物纳米材料（Fe2O3@CTAC）并研究了其对As（V）的吸附去除性能及机理。CTAC修饰不会改变Fe2O3的物理化学结构，而形成的Fe2O3@CTAC不仅可以通过铁氧化物表面络合作用吸附As（V），复合材料表面的氨基也可以通过静电作用吸附As（V）。因而复合材料对As（V）的吸附去除效果显著提升，饱和吸附容量可以达到23.13 mg·g-1。Fe2O3@CTAC 吸附As（V）可以在2 min内达到平衡，符合拟二级动力学模型和two-site Langmuir模型。在pH为3~9的范围内，Fe2O3@CTAC均能有效吸附去除As（V），去除率均能达到90%以上。天然有机质和硫酸根、碳酸氢根、硅酸根对As（V）在Fe2O3@CTAC上的吸附没有明显的抑制作用。磷酸根由于与As（V）存在竞争吸附作用而抑制As（V）的吸附，然而在通常水体磷酸根浓度条件下，Fe2O3@CTAC对As（V）的去除率依然达到90%以上。此外，Fe2O3@CTAC可以再生并重复利用，经过5次循环利用后As（V）的去除率能够保持在85%以上。
- 氯化十六烷基三甲铵 /
- Fe2O3 /
- As（V） /
- 吸附去除 /
- 循环利用
Abstract: Cetyltrimethylammonium chloride (CTAC) was used to modify magnetic nanoparticles (Fe2O3) to obtain amino-functionalized iron oxide nanoparticles (Fe2O3@CTAC), and the mechanism of As(V) adsorption onto Fe2O3@CTAC was studied. The modification of Fe2O3 with CTAC did not change the physicochemical structure of Fe2O3. Fe2O3@CTAC was able to adsorb As(V) not only through the surface complexation interactions between As(V) and Fe2O3, but also through the electrostatic interactions between As(V) and the amino groups of CTAC. Therefore, a greatly enhanced As(V) adsorption property was achieved and the As(V) adsorption capacity was found to be 23.13 mg·g-1. An As(V) adsorption equilibrium could be reached in 2 min by Fe2O3@CTAC at pH 6, and the As(V) adsorption fit with both a pseudo second order kinetic model and a two-site Langmuir isotherm model. Arsenate removal rates of over 90% could be reached in a wide pH range from 3 to 9, and the removal of arsenate was not obviously affected by the presence of dissolved natural organic matter (up to 10 mg·L-1 as total organic carbon (TOC)) or competitive anions (sulfate, bicarbonate, and silicate up to 20 mg·L-1, and phosphate up to 5 mg·L-1) in solution. Moreover, Fe2O3@CTAC could be regenerated and more than 85% As(V) was removed even in the fifth regeneration/reuse cycle.
- cetyltrimethylammonium chloride /
- iron oxide /
- arsenate /
- adsorption /
- reuse

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晋银佳, 陈享享, 王丰吉, 朱跃. 氨基复合铁氧化物对As（V）的吸附性能与机理[J]. 环境工程学报, 2017, 11(4): 2025-2033. doi: 10.12030/j.cjee.201510065

引用本文:

晋银佳, 陈享享, 王丰吉, 朱跃. 氨基复合铁氧化物对As（V）的吸附性能与机理[J]. 环境工程学报, 2017, 11(4): 2025-2033. doi: 10.12030/j.cjee.201510065

Citation:

氨基复合铁氧化物对As（V）的吸附性能与机理

1. 华电电力科学研究院, 环保技术部, 杭州 310030
2. 东北大学资源与土木工程学院, 沈阳 110819

收稿日期: 2015-12-01

基金项目:

国家水体污染控制与治理科技重大专项（2010ZX07212-008）

关键词:

摘要: 用氯化十六烷基三甲铵（Cetyltrimethylammonium chloride，CTAC）修饰铁氧化物Fe2O3，得到氨基复合的铁氧化物纳米材料（Fe2O3@CTAC）并研究了其对As（V）的吸附去除性能及机理。CTAC修饰不会改变Fe2O3的物理化学结构，而形成的Fe2O3@CTAC不仅可以通过铁氧化物表面络合作用吸附As（V），复合材料表面的氨基也可以通过静电作用吸附As（V）。因而复合材料对As（V）的吸附去除效果显著提升，饱和吸附容量可以达到23.13 mg·g-1。Fe2O3@CTAC 吸附As（V）可以在2 min内达到平衡，符合拟二级动力学模型和two-site Langmuir模型。在pH为3~9的范围内，Fe2O3@CTAC均能有效吸附去除As（V），去除率均能达到90%以上。天然有机质和硫酸根、碳酸氢根、硅酸根对As（V）在Fe2O3@CTAC上的吸附没有明显的抑制作用。磷酸根由于与As（V）存在竞争吸附作用而抑制As（V）的吸附，然而在通常水体磷酸根浓度条件下，Fe2O3@CTAC对As（V）的去除率依然达到90%以上。此外，Fe2O3@CTAC可以再生并重复利用，经过5次循环利用后As（V）的去除率能够保持在85%以上。

English Abstract

As(V) adsorption property and mechanism by amino-functionalized iron oxide nanomaterial

1. Department of Environment Protection Technology, Huadian Electric Power Research Institute, Hangzhou 310030, China
2. College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

Received Date: 2015-12-01

Fund Project:

Keywords:

Abstract: Cetyltrimethylammonium chloride (CTAC) was used to modify magnetic nanoparticles (Fe2O3) to obtain amino-functionalized iron oxide nanoparticles (Fe2O3@CTAC), and the mechanism of As(V) adsorption onto Fe2O3@CTAC was studied. The modification of Fe2O3 with CTAC did not change the physicochemical structure of Fe2O3. Fe2O3@CTAC was able to adsorb As(V) not only through the surface complexation interactions between As(V) and Fe2O3, but also through the electrostatic interactions between As(V) and the amino groups of CTAC. Therefore, a greatly enhanced As(V) adsorption property was achieved and the As(V) adsorption capacity was found to be 23.13 mg·g-1. An As(V) adsorption equilibrium could be reached in 2 min by Fe2O3@CTAC at pH 6, and the As(V) adsorption fit with both a pseudo second order kinetic model and a two-site Langmuir isotherm model. Arsenate removal rates of over 90% could be reached in a wide pH range from 3 to 9, and the removal of arsenate was not obviously affected by the presence of dissolved natural organic matter (up to 10 mg·L-1 as total organic carbon (TOC)) or competitive anions (sulfate, bicarbonate, and silicate up to 20 mg·L-1, and phosphate up to 5 mg·L-1) in solution. Moreover, Fe2O3@CTAC could be regenerated and more than 85% As(V) was removed even in the fifth regeneration/reuse cycle.

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氨基复合铁氧化物对As（V）的吸附性能与机理

As(V) adsorption property and mechanism by amino-functionalized iron oxide nanomaterial

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氨基复合铁氧化物对As（V）的吸附性能与机理

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As(V) adsorption property and mechanism by amino-functionalized iron oxide nanomaterial

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