摘要
分别在300、500和700℃将核桃青皮粉末限氧热解制备生物炭,以生物炭为载体固定化解有机磷菌(organic phosphorus-degrading bacteria,OPDB).通过对比不同热解温度生物炭固定化OPDB吸附Pb^(2+)的效果,优选出吸附效果最佳的固定化OPDB菌剂.利用傅里叶变换红外光谱分析、扫描电子显微镜、比表面积测试法对其进行表征分析,并探讨了生物炭添加量、溶液pH和吸附温度对吸附行为的影响,结合吸附动力学与等温吸附模型探究生物炭固定化OPDB对Pb^(2+)的吸附过程及机理.结果表明,500℃限氧热解核桃青皮生物炭固定化OPDB菌剂对Pb^(2+)的吸附效果最佳,最适吸附条件为:温度30℃,pH为6~7,生物炭添加量为0.1 g·100 mL^(-1).吸附过程较符合拟一级动力学模型,且吸附30 min基本达到平衡,符合Langmuir模型,属于单分子层吸附.
Biochar was prepared by oxygen limited pyrolysis of walnut green husk powder at 300,500 and 700℃,Respectively.The obtained biochar were used as carriers for immobilization of organic phosphorus-degrading bacteria(OPDB).The biochar immobilized OPDB were characterized by FTIR,SEM and BET.Then the pyrolysis temperature for biochar preparation and the adsorption conditions such as dosage of biochar,pH,and adsorption temperature were optimized by using biochar immobilized OPDB for Pb^(2+) adsorption.Moreover,the adsorption behavior and mechanism of Pb^(2+) were explored from the perspectives of adsorption kinetics and thermodynamics.The results showed that the immobilized OPDB using the biochar prepared under 500℃as the carrier had the best adsorption performance for Pb^(2+).The optimal adsorption conditions are as follows:pH 6~7,30℃and 0.1 g biochar per 100 mL solution.The adsorption process conformed to pseudo-first-order kinetics.The adsorption basically reached equilibrium in 30 min,and followed the Langmuir isotherm model,which means the sorption process was mainly monolayer sorption.
作者
朱晓丽
林姝欢
张星
张子夜
马晓杰
ZHU Xiaoli;LIN Shuhuan;ZHANG Xing;ZHANG Ziye;MA Xiaojie(College of Urban and Environmental Science,Northwest University,Xi’an 710127;Xi´an Kimberly Ecological Technology Co.,Ltd.,Xi'an 710065)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第3期116-126,共11页
Acta Scientiae Circumstantiae
基金
国家重点研发计划项目(No.2019YFD1002404)
陕西省重点研发计划项目(No.2020ZDLNY06-06,2020ZDLNY07-10,2019NY-200)
西安市科技计划项目(No.2019-GXYD18.9,20193057YF045NS045)。
关键词
核桃青皮
生物炭
固定化微生物
解有机磷菌
Pb^(2+)污染
walnut green husk
biochar
immobilized bacteria
organic phosphorus-degrading bacteria
Pb^(2+)pollution
