Fe2O3@GO聚合物对水中As3+的吸附特性表征

doi:10.11934/j.issn.1673-4831.2018.10.010

摘要/Abstract

摘要：

以氧化石墨烯（GO）和硝酸铁为原料，采用浸渍法制得Fe₂O₃@GO聚合物，研究不同质量比Fe/GO、pH值及温度条件对GO和Fe₂O₃@GO聚合物吸附水中As³⁺的影响，并通过吸附等温线和动力学方程进行相关拟合分析。同时，使用Roman光谱、FTIR、SEM等表征手段对GO和Fe₂O₃@GO聚合物2种材料进行表征，3种表征手段均显示铁已被成功负载到氧化石墨烯上。结果表明，As³⁺的去除率与复合物中Fe/GO的质量比呈显著正相关，吸附的最优pH值为8，温度为40℃。Fe₂O₃@GO聚合物及GO这2种材料吸附As³⁺的吸附等温线均符合Freundlich模型，准二级模型能更准确地描述其吸附动力学过程。在相同条件下，Fe₂O₃@GO聚合物较GO吸附性能更好，对于初始浓度为10 mg·L^-1的As³⁺溶液，GO和Fe₂O₃@GO聚合物的平衡吸附量分别达到17.95和31.30 mg·g^-1。

关键词: 氧化石墨烯, 三氧化二铁, 吸附, 砷

Abstract:

Using graphene oxide and ferric nitrate as raw materials, Fe₂O₃@GO polymer was synthesized by impregnation method and applied to the adsorption of As³⁺ in water samples. Mass ratio of Fe/GO, pH and temperature to the adsorption effect were studied. Meanwhile, the two materials were characterized by Raman spectroscopy, FTIR, SEM. All three characterization methods show that iron has been successfully loaded onto graphene oxide. The results show that the removal rate of As³⁺ was positively correlated with the mass ratio of Fe/GO in the complex, and the alkaline and high temperature conditions were more conducive to the adsorption. Besides, the adsorption isotherms of As³⁺ on the two materials conformed to the Freundlich isotherm model, and the adsorption process was better described by pseudo-second-order model. Fe₂O₃@GO polymer compared with GO had greater adsorption capacity under the same conditions. When the initial concentration of As³⁺ was 10 mg·L^-1, the equilibrium adsorption capacity of GO and Fe₂O₃@GO could reach to 17.95 and 31.304 mg·g^-1, respectively.

Key words: graphene oxide, ferric oxide, adsorption, arsenic

中图分类号:

邓天天, 胡烨, 刘帅霞, 李晗晟, 侯宇梦. Fe₂O₃@GO聚合物对水中As³⁺的吸附特性表征[J]. 生态与农村环境学报, 2018, 34(10): 930-938.

DENG Tian-tian, HU Ye, LIU Shuai-xia, LI Han-sheng, HOU Yu-meng. Adsorption Characteristics of Fe₂O₃@GO Polymer to As³⁺ in Water[J]. Journal of Ecology and Rural Environment, 2018, 34(10): 930-938.

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Fe₂O₃@GO聚合物对水中As³⁺的吸附特性表征

Adsorption Characteristics of Fe₂O₃@GO Polymer to As³⁺ in Water

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