摘要
针对水体重金属污染和落叶难以有效利用的问题,本研究以三球悬铃木和垂柳2种树木的落叶为原料制备生物炭,采用BET、SEM、FTIR等方法对其微观结构和组成进行分析,并通过吸附实验研究了2种生物炭对水中镉离子(Cd^(2+))的吸附性能及其影响因素。结果表明,Cd^(2+)的去除率与溶液pH和生物炭的投加量呈正相关,与电解质CaCl2浓度呈负相关。2种生物炭的吸附过程均符合Elovich方程和准二阶动力学方程,以非均相化学吸附为主。三球悬铃木落叶生物炭(BCP)和垂柳落叶生物炭(BCS)的吸附过程分别符合Langmuir和Freundlich吸附等温线,最大的吸附量分别为5.57和10.18 mg·g^(-1)。根据正交实验,BCP和BCS对水中Cd^(2+)的最佳吸附条件分别为:CaCl2浓度为0.05 mol·L^(-1),pH=7,BCP投加量为0.05 g,热解温度为500℃;CaCl2浓度为0 mol·L^(-1),pH=7,BCS投加量为0.05 g,热解温度为400℃。本研究为水中Cd^(2+)的去除以及落叶的资源化利用提供了可借鉴的方法和重要的科学依据。
Given the problems of heavy metal pollution in water and the difficulty in effectively utilizing the fallen leaves,biochars were prepared with fallen leaves of Platanus orientalis L.and Salix babylonica L.in this study.The microstructure and composition of biochars were analyzed by BET,SEM and FTIR.Their adsorption characteristics and influence factors to Cd^(2+)were studied through adsorption experiments.The results showed that the removal rate of Cd^(2+)was positively correlated with solution pH and biochar dosage,and negatively correlated with electrolyte CaCl2 concentration.The adsorption processes of both types of biochar conformed to the Elovich equation and the quasi second-order kinetic equation and were dominated by heterogeneous chemisorption.The adsorption processes of the Platanus orientalis L.fallen leaves biochar(BCP)and Salix babylonica L.fallen leaves biochar(BCS)followed Langmuir and Freundlich adsorption isotherms,with maximum adsorption amounts of 5.57 mg·g^(-1)and 10.18 mg·g^(-1),respectively.According to the orthogonal experiments,the optimal adsorption conditions for BCP and BCS were as follows:the concentration of CaCl2 solution was 0.05 mol·L^(-1),pH=7,BCP dosage was 0.05 g,and the pyrolysis temperature was 500℃;the concentration of CaCl2 solution was 0 mol·L^(-1),pH=7,BCS dosage was 0.05 g,and the pyrolysis temperature was 400℃.This study provides a reference method and important scientific basis for the removal of Cd(Ⅱ)in water and the effective utilization of fallen leaves.
作者
米世灿
陈芳
刘梦琦
么强
赵博
周可欣
蔺满凤
李晓斌
MI Shican;CHEN Fang;LIU Mengqi;YAO Qiang;ZHAO Bo;ZHOU Kexin;LIN Manfeng;LI Xiaobin(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Ocean College,Hebei Agriculture University,Qinhuangdao 066003,China;Water Resources and Water Conservation Development Center of Chengde,Chengde 067000,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2024年第10期2857-2868,共12页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金青年资助项目(41501514)
2023年河北省硕士在读研究生创新能力培养资助项目(CXZZSS2023198)
河北省自然科学基金面上资助项目(D2019501004)
河北省重点研发计划项目(19224204D)。
