【作者】 刘立华； 杨刚刚； 王易峰； 李童； 唐安平；

【Author】 Liu Lihua;Yang Ganggang;Wang Yifeng;Li Tong;Tang Anping;Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan Province College Key Laboratory of QSAR/QSPR, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology;

【机构】 湖南科技大学化学化工学院理论有机化学与功能分子教育部重点实验室分子构效关系湖南省普通高等学校重点实验室；

【摘要】 以氢氧化钙和正硅酸四乙酯为原料,采用共沉淀法制备了介孔硅酸钙,通过X射线衍射（XRD）、扫描电镜（SEM）、BET表面分析和红外光谱（IR）等对其结构进行了表征,并分别考察了其对含Pb²⁺和Cu²⁺模拟废水的吸附性能,以及解吸再生性能。结果表明,合成的硅酸钙具有介孔结构,为狭缝孔,孔径介于5-50 nm之间,比表面积为93.6 m²/g;在298K下,对Pb²⁺和Cu²⁺的平衡吸附容量分别为1.833和6.557 mmol/g;介孔硅酸钙吸附重金属离子为放热反应,主要是表面羟基与重金属离子间配位化学作用;经过5次洗脱再生,对Pb²⁺的平衡吸附量和去除率仅分别降低了0.102 mmol/g和4.2%,表明其具有优良的吸附/再生性能,有望成为优良的重金属离子吸附材料。更多还原

【Abstract】 Mesoporous calcium silicate were prepared using calcium hydroxide and tetraethyl orthosilicate as raw materials by means of co-precipitation. The calcium silicate synthesized were characterized by the X-ray diffraction（XRD）, scanning electron microscopy（SEM）, Brunauer-emmett-teller（BET） and infrared spectrum（FT-IR）. The adsorption performance of mesoporous calcium silicate synthesized for Pb²⁺ and Cu²⁺, and its desorption regeneration performance were studied. The results show that, the calcium silicate has mesoporous slit-pore structure, with a specific surface area of 93.6m²/g, and 5-50 nm pore size; the adsorption capacities for Pb²⁺ and Cu²⁺ are 1.833 and 6.557 mmol/g at 298 K, respectively. The adsorption between heavy metal ions and mesoporous calcium silicate synthesized is an exothermic reaction, mainly resulting from the coordination chemistry action between hydroxyl group on the surface of calcium silicate synthesized and heavy metal ions. The adsorption capacity and removal rate for Pb²⁺ have only decreased 0.102 mmol/g and 4.2% after 5 times elution-regeneration, respectively, indicating that the mesoporous calcium silicate synthesized is of excellent adsorption and regeneration performance. It is expected to be a good adsorption materials for heavy metal ions.更多还原