硼掺杂石墨烯对废水中铬(Ⅵ)的吸附性能及吸附机理研究  

Adsorption property and mechanism of chromium (Ⅵ) in wastewater by boron-doped graphene

作　　者：陈锋 马路路 郭世浩 张谋 袁莹锋 马培 刘帅霞 CHEN Feng;MA Lu-lu;GUO Shi-hao;ZHANG Mou;YUAN Ying-feng;MA Pei;LIU Shuai-xia(School of Resource and Environment,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院资源与环境学院,河南郑州451191

出　　处：《应用化工》2019年第5期1001-1006,1011,共7页Applied Chemical Industry

基　　金：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)

摘　　要：以硼酸为掺杂剂、氧化石墨烯(G)为前驱体,通过一步水热法制备出硼掺杂石墨烯(B-G),并首次利用静态吸附实验研究其对废水中Cr(Ⅵ)的吸附性能和吸附机理。结果表明,硼掺杂可显著提升G对Cr(Ⅵ)的吸附性能,其中B-G-3对Cr(Ⅵ)的吸附效率超过80%。吸附Cr(Ⅵ)的最佳pH值为2;吸附率随着投加量的增加而增大,吸附量随着Cr(Ⅵ)初始浓度的增大而增大;温度升高有利于吸附进行。当pH=2,吸附剂投加量为20 mg,Cr(Ⅵ)初始浓度为100 mg/L,45℃条件下吸附12 h,B-G-3对Cr(Ⅵ)的吸附量高达119.5 mg/g。SEM、BET、FTIR、XRD和Raman检测表明,B-G-3为具有微介孔结构的纳米片状无定型碳,比表面积和孔体积分别为192.14 m^2/g和0.50 cm^3/g,且表面带有大量的含氧和含硼官能团。吸附的机理主要为微介孔的物理吸附以及表面含氧及含硼官能团的化学吸附。Boron-doped graphene(B-G)was synthesized by one pot hydrothermal method using graphene oxide and boric acid as the carbon precursor and dopant,the adsorption property and mechanism of Cr(Ⅵ)in wastewater were then studied by static adsorption experiment for the first time.The results showed that,boron doping can significantly improve the adsorption performance of Cr(Ⅵ)by G,and the Cr(Ⅵ)adsorption rate by B-G-3 was more than 80%.The optimal pH value for Cr(Ⅵ)adsorption is 2.The removal percentage of Cr(Ⅵ)increases with the adsorbent dosage increasing,and the Cr(Ⅵ)adsorption quantity increases with the increasing of Cr(Ⅵ)initial concentration.High temperature favors the adsorption.When pH value is 2,the B-G-3 dosage is 20 mg,the initial concentration of Cr(Ⅵ)is 100 mg/L,and the adsorption time is 12 h,the resulting adsorption quantity can reach 119.5 mg/g at 45℃.The SEM,BET,FTIR,XRD and Raman tests showed that B-G-3 was nanosheet-like amorphous carbon,the specific surface area and pore volume were respectively 192.14 m^2/g and 0.50 cm^3/g,and the surface was rich in oxygen-containing and boron-containing functional groups.The adsorption mechanism mainly involves both physisorption by micro-/mesopore and chemisorptions by oxygen-containing and boron-containing functional groups.

关 键 词：石墨烯 硼掺杂 六价铬 吸附性能 吸附机理 

分 类 号：TQ136.11[化学工程—无机化工] TQ028.1