Preparation of a novel porous adsorption material from coal slag and its adsorption properties of phenol from aqueous solution
Preparation of a novel porous adsorption material from coal slag and its adsorption properties of phenol from aqueous solution
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DOI：
10.1016/j.matdes.2015.09.079
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发表时间：
2015-12
影响因子：
8.4
通讯作者：
Wenjing Tang;Huijuan Huang;Yajun Gao;Xiaoyao Liu;Xinyu Yang;H. Ni;Jianbin Zhang
中科院分区：
文献类型：
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作者：
Wenjing Tang;Huijuan Huang;Yajun Gao;Xiaoyao Liu;Xinyu Yang;H. Ni;Jianbin Zhang
以原煤渣为原料成功制备了一种新型多孔吸附材料（PAM），并采用n2吸附-解吸等温线、热重分析（TGA）、红外光谱（FTIR）、扫描电镜（SEM）、透射电镜（TEM）和x射线衍射（XRD）等技术对其进行了表征。PAM的制备过程包括两个步骤：(1)煤渣SiO32−化学浸出；(2)PAM的制备。确定了预处理SiO32−的最佳浸出条件：HCl为30 mL，煤渣粒度为200目，浸出温度为100℃，反应时间为2 h， NaOH初始浓度为30 wt.%，碱渣比为2:1。在此条件下，SiO32−浸出率达到39.42 wt.%，占煤渣中sio2总含量的80.78 wt.%。在Ca/Si摩尔比为0.75:1的条件下，在90℃条件下反应4 h，制备得率为99.20 wt.%的PAM。根据Langmuir模型，PAM对苯酚的最大吸附量为63.78 mg/g。吸附热力学结果表明，该过程是放热的、热力学可行的、自发的、化学可控的。
A new porous adsorption material (PAM) was successfully prepared from raw coal slag and characterized by several techniques, including N2adsorption–desorption isotherm, thermogravimetric analysis (TGA), flourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), Transmission electron microscope (TEM) and X-ray diffraction (XRD) measurement. The preparation procedure of PAM involved two steps: (1) SiO32 −chemical leaching from coal slag, and (2) preparation of the PAM. The optimum SiO32 −leaching condition was confirmed at 30 mL HCl for the pretreated processes, 200 mesh particle size of coal slag, leaching temperature of 100 °C, reaction time of 2 h, NaOH initial concentration of 30 wt.%, and the ratio of alkaline to slag of 2:1. Under this condition, SiO32 −leaching yield arrived at 39.42 wt.%, which accounted for 80.78 wt.% of the total content of SiO32in coal slag. The PAM was then easily prepared with the yield of 99.20 wt.% at 90 °C for 4 h with Ca/Si mole ratio of 0.75:1. According to Langmuir model, the adsorption capability of phenol on the PAM with a maximum uptake was 63.78 mg/g. According to adsorption thermodynamic results, the process was exothermic, thermodynamically feasible, spontaneous and chemically controlled.