氧化石墨烯负载纳米零价铁的制备及其对亚甲基蓝的吸附

采用液相还原法制备氧化石墨烯负载纳米零价铁吸附剂(Fe0/GO),并用于吸附去除溶液中的亚甲基蓝(MB)。考察了溶液p H、吸附温度、吸附时间、初始MB质量浓度对Fe0/GO吸附MB的影响。SEM等表征结果显示:Fe0以球形或短链形负载在GO上,增加了材料的反应活性位点;Fe0/GO的比表面积为158.32 m2/g,等电点为3。实验结果表明:在溶液p H为6、吸附时间5 h、吸附温度25℃的最佳条件下,加入400 mg/L的Fe0/GO,处理初始MB质量浓度为160 mg/L的MB溶液,MB去除率为89.26%,吸附量为125.5 mg/g;Langmuir等温吸附方程和Frenudlich等温吸附方程均能较好地描述Fe0/GO对MB的吸附过程;Fe0/GO对MB的吸附行为遵循准二级动力学方程;计算得出吸附温度为25℃、初始MB质量浓度为160 mg/L时的饱和吸附量为201.2 mg/g,平衡吸附量为124.3 mg/g。

Preparation of Graphene Oxide Supported Nanoscale Zero Valent Iron and Adsorption of Methylene Blue

Graphene oxide supported nanoscale zero valent iron （Fe⁰/GO） was prepared by liquid phase reduction method and was used to remove methylene blue （MB） from solution. The effects of solution pH,adsorption temperature,adsorption time and initial MB mass concentration on MB adsorption were investigated. The characterization results showed that：Fe⁰ is loaded on GO in form of sphere or short-chain,which increases the reactive sites of the adsorbent;the specific surface area and the isoelectric point of Fe⁰/GO are 158.32 m²/g and 3. The experimental results showed that：Under the optimum conditions of solution pH 6,adsorption time 5 h,adsorption temperature 25 ℃,Fe⁰/GO dosage 400 mg/L and initial MB mass concentration 160 mg/L,the MB removal rate is 89.26%,the adsorption capacity is 125.5 mg/g;The adsorption isotherms fit well with the Langmuir and Frenudlich isotherms models;The adsorption processe follows with the pseudo-second-order model;When the adsorption temperature is 25 ℃ and the initial MB mass concentration is 160 mg/L,the saturated adsorption capacity and the equilibrium adsorption capacity are 201.2 mg/g and 124.3 mg/g,respectively.