摘要
环境水体中的重金属污染对生态环境和人类健康造成严重威胁,研发对重金属具有高效吸附性的复合材料具有重要意义。本研究以骨粉与不同摩尔比的Fe(NO_(3))_(3)和KMnO_(4)(4∶1、2∶1、1∶1、1∶2和1∶4)为原料,利用溶液浸渍联合高温裂解法制备铁锰氧化物修饰的生物炭复合材料(FM-BCs);探究原料组成对复合材料组成、结构和表面性质和对水溶液中Cd(Ⅱ)和Pb(Ⅱ)吸附能力的影响以及潜在的吸附机制。结果表明:铁锰氧化物修饰可改变材料的孔结构,且在生物炭表面引入Fe-O和Mn-O特征官能团;制备原料中KMnO_(4)和Fe(NO_(3))_(3)的摩尔比对合成的铁锰氧化物-骨炭复合材料对水溶液中Cd(Ⅱ)和Pb(Ⅱ)的吸附能力影响较大,其中在Fe(NO_(3))_(3)和KMnO_(4)的摩尔比为1∶4条件下制备的复合材料(F_(1)M_(4)-BC)对重金属的吸附能力最优;通过吸附动力学和吸附等温线研究,表明FM-BCs对水溶液中的Cd(Ⅱ)和Pb(Ⅱ)的吸附过程均是单层吸附和化学吸附,且Langmuir模型拟合结果显示F_(1)M_(4)-BC对Cd(Ⅱ)和Pb(Ⅱ)的饱和吸附量分别达到192.73和427.00 mg/g。该研究结果为高效去除水中重金属污染物的环境修复材料的研发提供基础科学依据。
Heavy metal contamination of environmental waters poses a serious threat to the ecological balance and human health.Therefore,the development of composite materials with highly efficient heavy metals adsorption capabilities is of crucial significance.In this study,the iron-manganese oxides modified biochar(FM-BCs)composite materials were prepared by the use of bone powder and Fe(NO 3)3 and KMnO 4 in different molar ratios(4∶1,2∶1,1∶1,1∶2,and 1∶4)as raw materials.The results show that iron-manganese modification alters the material's pore∶structure and introduces Fe-O and Mn-O characteristic functional groups on the surface of the biochar.The molar ratio of KMnO 4 to Fe(NO 3)3 in the composition of the prepared raw materials significantly influences the adsorption capacity of the FM-BCs composite material for heavy metal ions.In particular,the composite material prepared under the condition that the molar ratio of Fe(NO 3)3 and KMnO 4 is 1∶4(F 1M 4-BC)has the best adsorption capacity for heavy metals.Through the study of adsorption kinetics and adsorption isotherms,it was found that FM-BCs predominantly undergo single layer adsorption and chemical adsorption processes for Cd(Ⅱ)and Pb(Ⅱ)ions in aqueous solutions.Specifically,the Langmuir model fitting forF_(1)M_(4)-BC demonstrated maximum adsorption capacities of 192.73 mg/g for Cd(Ⅱ)and 427.00 mg/g for Pb(Ⅱ).This research results provide a fundamental scientific basis and technical support for the development of efficient remedial materials for the removal of heavy metals from water.
作者
赵博
李海华
陈岩
杨小丽
孙立祥
张平选
石成龙
肖江
陈光才
ZHAO Bo;LI Haihua;CHEN Yan;YANG Xiaoli;SUN Lixiang;ZHANG Pingxuan;SHI Chenglong;XIAO Jiang;CHEN Guangcai(Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Hangzhou 311400,Zhejiang,China;School of Environmental and Municipal Engineering,North China University of Water Resources andElectric Power,Zhengzhou 450046,Henan,China;School of Chemistry and Chemical Engineering,Qinghai Minzu University,Xining 810007,Qinghai,China;Tongling City State-Owned Forest Farm,Tongling 244000,China)
出处
《功能材料》
北大核心
2025年第1期1016-1027,共12页
Journal of Functional Materials
基金
国家自然科学基金青年基金项目(32101370)
中国博士后科学基金特别资助项目(2019T120154)
中央财政林业科技推广示范项目(皖[2023]TG09号)。
关键词
铁锰氧化物
骨粉
生物炭
重金属
吸附
iron and manganese oxides
bone meal
charcoal
heavy metals
adsorption
