硫代氨基功能化粉煤灰空心微珠@碳纳米管吸附Cu^(2+)研究  

Study on Cu^(2+)adsorption with thiosemicarbazide functionalized fly ash cenospheres@carbon nanotubes

作　　者：王柯[1] 张晓民[1] 张良[2] 刘佳倩 刘冰[1] 王壮 马健翔 Wang Ke;Zhang Xiaomin;Zhang Liang;Liu Jiaqian;Liu Bing;Wang Zhuang;Ma Jianxiang(School of Resources Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China;School of Chemistry and Chemical Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055 [2]西安建筑科技大学化学与化工学院,陕西西安710055

出　　处：《化工矿物与加工》2023年第9期6-13,共8页Industrial Minerals & Processing

基　　金：国家自然科学基金项目(51874223);酒钢集团科技研发项目(4500618489);咸阳市科技局重点研发计划项目(Z20220151)。

摘　　要：碳纳米管作为一维纳米材料,具有高比表面积和结构可控等优点,被广泛应用于吸附领域,同时也因存在疏水性强、表面惰性以及选择性吸附能力差等不足而限制了其在重金属吸附领域的应用。以燃煤废料粉煤灰空心微珠为原料,制备了一种具有高缺陷密度的空心微珠@碳纳米管材料,并通过羧基化、酰氯化在其表面接枝了硫代氨基官能团,将其用于吸附水溶液中的Cu^(2+),结果表明:粉煤灰空心微珠@碳纳米管表面成功引入了羧基、羟基、氨基等官能团,表面Zeta电位降低;吸附容量与吸附过程中的反应温度、初始pH、初始质量浓度呈正相关;在120 min时吸附达到平衡,平衡时复合材料对Cu^(2+)的吸附容量为34.0 mg/g;吸附过程符合Freundlich吸附等温线模型,与准二级动力学模型拟合度高,吸附过程为自发的吸热反应;吸附机理包括离子交换、静电相互作用和表面络合作用。该研究成果可为粉煤灰的高值化利用和水溶液中Cu^(2+)的吸附研究提供参考。As one-dimensional nano-material with the advantages of high specific surface area and controllable structure,carbon nanotubes are widely used in the domain of adsorption,but restricted for application in heavy metal adsorption because of such disadvantages as high hydrophobicity,surface inertness and poor selective adsorption capability.With the spent fly ash cenospheres from coal combustion,the cenospheres@carbon nanotube materials with high density of defects were prepared and grafted with thiosemicarbazide functional groups on their surface by carboxylation and chlorination,and applied to the adsorption of Cu^(2+)in aqueous solution.The results show that the functional groups such as carboxyl,hydroxyl and amino groups were successfully introduced on the surface of fly ash cenospheres@carbon nanotubes,which makes the surface zeta potential drop.The adsorption capacity presented positive correlation with the reaction temperature,initial pH and initial concentration during the adsorption process.The adsorption lasted for 120 min reached the equilibrium,and the capacity of the composite material for absorbing Cu^(2+)at equilibrium was 34.0 mg/g.The adsorption process conformed to the Freundlich adsorption isotherm model and fitted well with the pseudo-secondary kinetic model and exhibited the spontaneous endothermic reaction.The adsorption mechanism includes ion exchange,electrostatic interactions and surface complexation.This research results can be provided for reference in the high-value utilization of fly ash and the adsorption of Cu^(2+)in aqueous solution.

关 键 词：粉煤灰空心微珠 碳纳米管 功能化改性 氨基硫脲 Cu^(2+)吸附 Freundlich吸附等温线模型 吸附机理 

分 类 号：X752[环境科学与工程—环境工程]