摘要
将十二烷基磺酸钠(SDS)改性的系列多级孔硅酸镁纳米材料(FMS)用于吸附工业废水中重金属离子Ni^(2+),采用电感耦合等离子发射光谱仪(ICP AES)测定吸附前后溶液中Ni^(2+)的浓度,对所测定的实验数据用动力学和Langmuir吸附模型进行拟合。根据系列改性材料表征数据和实验数据拟合结果,研究系列改性材料的吸附行为及其对Ni^(2+)的吸附效能与吸附材料比表面积、孔结构等性质之间的构效关系。结果表明:孔径和比表面积更大的5 FMS(FMS中添加5%(质量分数)SDS)对Ni^(2+)的平衡吸附量最大,可达231.62 mg/g;所有材料对Ni^(2+)的吸附行为均符合拟二级动力学模型,表明化学吸附在吸附过程中占主导地位;同时所有材料对Ni^(2+)的吸附较好地符合Langmuir吸附模型,即为单分子层均匀吸附,其中5 FMS理论吸附量最大,为280.40 mg/g;该系列材料主要是通过静电吸附、表面金属离子(Mg^(2+))和酸性基团与溶液中Ni^(2+)交换达到去除Ni^(2+)的目的。
A series of hierarchical porous magnesium silicate nanomaterials modified by sodium dodecyl sulfonate(SDS)were applied to adsorb the heavy metal ions Ni^(2+)in industrial wastewater.The concentration of Ni^(2+)in the solution before and after adsorption was determined by inductively coupled plasma emission spectrometer(ICP-AES),and the experimental data were fitted with the kinetic and Langmuir adsorption model.Based on the fitting results of the characterization data and experimental data,the adsorption behavior of the modified materials,the structure-activity relationship between the adsorption efficiency of the modified materials and the specific surface area,pore structure of the adsorbed materials were discussed.Results showed that the equilibrium adsorption capacity of 5-FMS(doped with mass fraction 5%SDS)with large pore size and specific surface area was the largest,which could reach 231.62 mg/g.The adsorption behavior of Ni^(2+)by all materials conformed to the pseudo-second-order kinetic model,which indicated that chemisorptions played a dominant role in the adsorption process.At the same time,the adsorption of Ni^(2+)by all materials conformed to the Langmuir adsorption model well,indicating that the adsorption of Ni^(2+)by all materials was single molecular layer uniform adsorption,and the theoretical adsorption capacity of 5-FMS was the largest,which was 280.40 mg/g.The removal of Ni^(2+)with this series of materials was mainly due to electrostatic adsorption,the surface metal ions(Mg^(2+))and acid groups exchange with Ni^(2+)in solution.
作者
鲍静
冯拥军
潘勇
蒋军成
BAO Jing;FENG Yongjun;PAN Yong;JIANG Juncheng(College of Safety Science and Engineering,Nanjing Tech University,Nanjing 211800,China;Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control,Nanjing 211800,China;State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2023年第6期647-653,共7页
Journal of Nanjing Tech University(Natural Science Edition)
关键词
硅酸镁
多级孔
改性剂
Ni^(2+)吸附
废水处理
吸附剂
magnesium silicate
hierarchical porous
modifier
Ni^(2+)adsorption
wastewater treatment
adsorbent
