科学研究

硼掺杂还原氧化石墨烯吸附六价铬的动力学和热力学研究

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  • 河南工程学院资源与环境学院,郑州451191
陈锋(1987-),男,博士研究生,讲师,主要研究方向为新型碳材料的制备及在储能和废水处理领域的应用。

收稿日期: 2019-02-26

  网络出版日期: 2022-11-01

基金资助

国家自然科学基金青年基金项目(41401549);河南省高等学校重点科研项目(19A610004);河南工程学院博士基金项目(D2017011);2019年度河南省青年人才托举工程项目(2019HYTP012)

Kinetic and thermodynamic studies on the adsorption of Cr(Ⅵ) by B-RGO

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  • School of Resource and Environment,Henan University of Engineering,Zhengzhou 451191

Received date: 2019-02-26

  Online published: 2022-11-01

摘要

以氧化石墨烯为碳源,硼酸为硼源,采用水热法一步制得硼掺杂还原氧化石墨烯(B-RGO),利用扫描电镜、X射线衍射和红外光谱表征其物理性能,并首次研究其对Cr(Ⅵ)的吸附动力学和热力学。结果表明,B-RGO中B含量为7.16at%,为纳米片状无序结构碳,表面存在含氧和含硼官能团,可以提供更多的活性吸附位点,因而其对 Cr(Ⅵ)的吸附性能优于RGO和GO。测试发现,其动力学符合准二级动力学模型,相关系数R2为0.992,化学吸附起主导作用;粒子内扩散模型表明,吸附的速率由膜扩散和内扩散共同控制。不同温度下的吸附等温线更符合Langmuir等温式,最大吸附量为119mg/g(318K),0<RL<1,说明B-RGO吸附Cr(Ⅵ)为有利吸附。热力学参数ΔG0<0,ΔH0>0,ΔS0>0,表明B-RGO吸附Cr(Ⅵ)的过程是自发的、吸热的熵增反应。

本文引用格式

陈锋, 马路路, 张谋, 郭世浩, 徐子豪, 马培, 刘帅霞 . 硼掺杂还原氧化石墨烯吸附六价铬的动力学和热力学研究[J]. 化工新型材料, 2020 , 48(7) : 139 -144 . DOI: 10.19817/j.cnki.issn 1006-3536.2020.07.032

Abstract

Boron-doped reduced graphene oxide (B-RGO) was prepared by one pot hydrothermal method using graphene oxide(GO) and boric acid as the carbon precursor and boron source.The physical properties of B-RGO were characterized by scanning electron microscopy (SEM),X-ray diffraction (XRD) and fourier transform infrared spectrum (FT-IR),and its adsorption kinetics and thermodynamics for Cr(Ⅵ) were also studied for the first time.The results showed that B-RGO was nanosheet-like disordered structure carbon,the content of B in B-RGO was 7.16 at%.The surface had oxygen-containing and boron-containing functional groups,which could provide more active adsorption sites.Thus,the adsorption performance of Cr(Ⅵ) by B-RGO was superior to that of RGO and GO.The adsorption kinetics fitted well to the pseudo-second-order model,and the correlation coefficients R2 was 0.992,suggesting that the adsorption of Cr(Ⅵ) by B-RGO was dominated by chemisorption.The intra-particle diffusion model showed that the rate-controlled step was governed by both film-diffusion and intra-particle diffusion.The adsorption isotherms at different temperatures were more consistent with the Langmuir isotherm,with a maximum adsorption quantity of 119mg/g (318K).Moreover,0<RL<1,indicating that the adsorption of Cr(Ⅵ) by B-RGO was a favorable process.The thermodynamic parameters ΔG0<0,ΔH0>0,ΔS0>0,manifesting that the adsorption process was spontaneous,endothermic and randomness.

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