基于MICP的巴氏生孢八叠球菌固定Cd2+、Pb2+和Cr3+的研究
伍婧妍 , 梁艳 , 陶虹秀 , 罗秋雨
现代化工 ›› 2025, Vol. 45 ›› Issue (4) : 160 -166.
基于MICP的巴氏生孢八叠球菌固定Cd2+、Pb2+和Cr3+的研究
Study on fixation of Cd2+,Pb2+ and Cr3+ by MICP-based Sporosarcina pasteurii
本文探究了初始pH、温度、尿素浓度等因素对巴氏生孢八叠球菌固定重金属Cd2+、Pb2+和Cr3+的影响,并解析了巴氏生孢八叠球菌固定重金属的方式。结果表明,在培养时间为48 h、培养温度为30℃、初始培养基pH为8.0、尿素浓度为1 mol/L的条件下,巴氏生孢八叠球菌对Cd2+、Pb2+和Cr3+三种重金属的固定效果均最佳。尿素和巴氏生孢八叠球菌的生长代谢均会使环境pH升高,分别导致了0.08%~8.95%和1.03%~10.42%的重金属离子发生碱性沉淀。微生物诱导的碳酸钙沉淀(MICP)为最主要固定方式,其固定率最高达到60.79%(Cd2+)、61.92%(Pb2+)和23.07%(Cr3+)。
This study examines the influences of initial pH,temperature,and urea concentration on the fixation of heavy metals (Cd2+,Pb2+,and Cr3+) by Paenibacillus pasteurii,along with an analysis of the underlying fixation mechanism.Results indicate that the immobilization effects of Cd2+,Pb2+,and Cr3+ by Paenibacillus pasteuriiare all achieve the optimal under the conditions including 48 hours of incubation,30℃,an initial medium pH of 8.0 and a urea concentration of 1 mol·L-1.The environmental pH is elevated by both the presence of urea and the metabolic activities of Paenibacillus pasteurii,leading to that 0.08%-8.95% and 1.03%-10.42% of the heavy metal ions,respectively form alkaline precipitation.Microbially induced calcium carbonate precipitation (MICP) emerges as the dominant fixation pathway,with the maximum fixation rate of 60.79% for Cd2+,61.92% for Pb2+,and 23.07% for Cr3+.
重金属 / 固化 / 巴氏生孢八叠球菌 / 微生物诱导的碳酸钙沉淀
heavy metal / fixation / sporosarcina pasteurii / microbially Induced calcium carbonate precipitation
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广西重点研发计划项目(桂科AB23075157)
广西自然科学基金(2023GXNSFAA026386)
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