Fe_3O_4磁性纳米氧化石墨烯制备及对汞(II)的吸附  

Synthesis of Fe_3O_4 Magnetic Graphene Oxide Nanocomposite and Its Adsorption for Mercury(II)

作　　者：朱鹤 周超 王钦 周晓吉 郭永福 白仁碧 

机构地区：[1]苏州科技大学分离净化材料与技术研发中心,江苏苏州215009

出　　处：《水处理技术》2018年第1期48-54,60,共8页Technology of Water Treatment

基　　金：国家自然科学基金(51578354);江苏省自然科学基金(BK20141179);江苏省普通高校研究生科研创新计划项目(SJZZ15-0170,SJZZ160248);苏州市科技局民生科技项目(SS201667);江苏省“青蓝工程”;江苏省“六大人才高峰”(2016-JNHB-067)

摘　　要：为改善氧化石墨烯(GO)对水中重金属汞的吸附性能,采用改进的Hummers及共沉淀方法原位合成出磁性氧化石墨烯(MGO)复合材料,通过扫描电镜、透射电镜、X射线能谱仪、比表面分析仪、X射线衍射仪、傅里叶红外光谱仪、X射线光电子能谱仪、Zeta电位和磁强计等进行了表征,研究了MGO对水中Hg(II)的吸附时的各项参数,用4种动力学模型、2种吸附等温模型以及热力学模型进行了拟合。结果表明,MGO的BET高达741.3 m^2/g,相比GO的BET增加了43.7%;在温度320 K和p H为8.0时,MGO对Hg(II)的Langmuir吸附容量可达63.7 mg/g,吸附后的材料易于固液分离;MGO对Hg(II)的吸附过程是吸热和自发的,受颗粒内扩散过程的影响,并涉及部分化学吸附,符合Langmuir和准2级动力学模型。In order to enhance the adsorption property of graphene oxide （GO） for mercury （Hg（Ⅱ））, a magnetic graphene oxide （MGO） nanocomposite loaded with Fe304 magnetic nanoparticles was in situ synthesized by modified Hummers and co-precipitation, and it was characterized via SEM, TEM, EDX, BET, XRD, FT-IR, XPS, Zeta potential and VSM. And the adsorption performance of MGO for Hg（Ⅱ） from water was deeply researched. The adsorption kinetics, isotherms and thermodynamic models were investigated in detail to gain insights of the adsorption process. The results showed that, the BET of MGO reached 741.3 m2/g, which was increased 43.7% as compared with BET of GO. Langmuir adsorption capacity of MGO for Hg（Ⅱ） was 63.7 mg/g at 320 K and pH of 8.0. MGO could be efficiently separated from water via a magnetic field. The adsorption process was endothermic and spontaneous, and in accord with Langmuir and pseudo-second-order models. Overall adsorption of Hg（Ⅱ） was not only involved some chemisorption but also partially governed by intra-particle diffusion.

关 键 词：磁性氧化石墨烯 FE3O4 汞 吸附 动力学 热力学 

分 类 号：TQ424.29[化学工程]