湿法冶金2025，Vol.44Issue(5)：635-644,10.DOI:10.13355/j.cnki.sfyj.2025.05.008
磷酸盐改性氮掺杂生物炭除铀效果及机制研究
Removal Effect and Mechanism of Phosphate-modified Nitrogen-doped Biochar for Uranium
摘要
Abstract
The original biochar(BC)was prepared by pyrolysis using chestnut shells as raw materials,and then the phosphate-modified nitrogen-doped biochar(NP-BC)was prepared by nitrogen doping and phosphate modification methods.The adsorption performance of BC and NP-BC for uranium in wastewater was investigated.The surface morphology and elements of BC and NP-BC were analyzed by means of SEM,EDS,BET,FT-IR and XPS,and the adsorption mechanism of BC and NP-BC for uranium was discussed.The results show that for the wastewater with an initial mass concentration of uranium of 10 mg/L and initial pH of 4,under the conditions of NP-BC dosage of 0.2 g/L and reaction temperature of 30℃,the adsorption removal rate of U(Ⅵ)can reach 99.32％.The influence of coexisting anions and cations on the division of U(Ⅵ)in NP-BC increases with the increase of ion concentration.The adsorption process is more suitable to be described by the pseudo-second-order kinetic model and the Langmuir isothermal adsorption model.It is concluded through FT-IR and XPS analysis that the adsorption mechanism of uranium by NP-BC is the coordination effect and reduction effect of oxygen-containing functional groups,nitrogen-containing functional groups and phosphate groups.关键词
废水/铀/生物炭/氮掺杂/改性/吸附/机制Key words
wastewater/uranium/biochar/nitrogen doping/modification/adsorption/mechanism分类
能源科技引用本文复制引用
熊芷毓,毛悦梅,李仕友,刘佳瑶,邓琪琪,曾涛涛..磷酸盐改性氮掺杂生物炭除铀效果及机制研究[J].湿法冶金,2025,44(5):635-644,10.基金项目
国家自然科学基金资助项目(52170164) （52170164）
湖南省研究生科研创新项目资助(CX20240823). （CX20240823）
