两种典型麻类生物炭对水体中镉离子的吸附性能研究  

Study on the Adsorption Properties of Cadmium Ions in Water by Ramie and Kenaf Biochars

作　　者：黄薪铭 李丹阳 伍德 张朴心 刘玉玲[1,2,3] 铁柏清 HUANG Xinming;LI Danyang;WU De;ZHANG Puxin;LIU Yuling;TIE Boqing(College of Resources and Environment of Hunan Agricultural University,Changsha 410128,Hunan,China;Hunan Irrigation Water Water Polltion Purification Engincering and Technology ResearchCenter,Changsha 410128,Hunan,China;Key laboratory for pollution prevention and control in the southem part of the Ministry of Agriculure and Rural Affairs,Changsha 410128,Hunan,China)

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]湖南省灌溉水源水质污染净化工程技术研究中心,湖南长沙410128 [3]农业农村部南方产地污染防控重点实验室,湖南长沙410128

出　　处：《中国麻业科学》2022年第3期171-182,共12页Plant Fiber Sciences in China

基　　金：湖南省高新技术产业科技创新引领计划(科技攻关类)(2020NK2001);国家自然科学基金(41907015);国家重点研发计划项目(2017YFD0801505)。

摘　　要：研究以苎麻和红麻茎、叶、皮3个部位为原材料制备生物炭,通过静态批次吸附试验,探究投加量、初始溶液pH、初始溶液Cd^(2+)浓度、反应时间、再生处理对6种生物炭吸附水中Cd^(2+)性能的影响,同时拟合动力学方程及等温吸附模型,并采用扫描电镜、X射线光电子能谱对6种生物炭进行表征分析,研究其吸附机理。结果表明,6种材料中,苎麻叶生物炭对水中Cd^(2+)的吸附效果最好,最大吸附量达到了133.05mg/g。6种生物炭对水中Cd^(2+)的去除率受投加量影响较大,苎麻茎生物炭受溶液初始pH影响较大。6种生物炭对Cd^(2+)脱附再生再吸附一次都能保持较好吸附效果,其中苎麻叶生物炭效果最佳。6种吸附材料都能较好地拟合Langmuir理论模型和准二级动力学方程。生物炭对Cd的吸附机理主要为羟基化表面(-OH)或其去质子化(-O-)络合反应及静电作用。6种生物炭材料均是较好的吸附材料,其中苎麻叶材料的吸附潜力最为突出。In this study, three parts of ramie and kenaf, stems, leaves and bark were used as raw materials to produce biochars. The effects of injection amount, initial solution pH, initial solution Cd^(2+) concentration, reaction time and regeneration treatment on the adsorption performance of the six biochars on Cd^(2+) in water were investigated by static batch adsorption tests, while kinetic equations and isothermal adsorption models were fitted. The scanning electron microscopy and X-ray photoelectron spectroscopy analysis were used to analyze the six biochars to study their adsorption mechanisms. The results shows that, among the six materials, ramie leaf biochar has the best adsorption effect on Cd^(2+) in water, with the maximum adsorption capacity reaching 133.05 mg/g. The removal rate of Cd^(2+) in water is influenced by the dosage of the six biochars. The initial pH of the solution is influenced by ramie stem biochar. All the six adsorption materials are able to fit the Langmuir model and quasi-secondary kinetic equations well. The adsorption mechanism of Cd on biochar is mainly hydroxylated surface(-OH) or its deprotonation(-O-) complexation and electrostatic effect. Six biochar materials are good adsorption materials, among which ramie leaf material has the most outstanding adsorption potential.

关 键 词：生物炭 苎麻 红麻 镉离子 

分 类 号：S563.1[农业科学—作物学] S563.5