南华大学学报（自然科学版）2026，Vol.40Issue(2)：41-48,8.DOI:10.19431/j.cnki.1673-0062.2026.02.005
EICP改性稻壳生物炭吸附四环素的性能研究
Study on the adsorption performance of tetracycline by EICP-modified rice husk biochar
摘要
Abstract
Rice husk biochar was used as the raw material to fabricate an adsorbent via modification with enzyme-induced calcium carbonate precipitation(EICP),and enzyme-free and inactivated enzyme groups were established as controls.The microstructure and pore structure of the materials were characterized by SEM,FTIR and BET.The adsorption performance and mechanism of the modified biochar for tetracycline were investigated through adsorption kinetics,isotherm,pH effect experiments and five adsorption-desorption cycles.The results showed that EICP modification rendered the biochar surface rough and porous,with its specific surface area increased by 42.3%to 183.0 m2/g com-pared with the original biochar,the oxygen-containing functional groups increased signifi-cantly,and calcium carbonate was successfully loaded and firmly bonded to the biochar.The adsorption kinetics fitted well with the pseudo-second-order model(R2=0.9949),and the adsorption isotherm conformed to the Langmuir model(R2=0.997 1),indicating a monolayer chemical adsorption process,with the fitted maximum adsorption capacity reac-hing 49.55 mg/g.The optimal adsorption effect was achieved at pH=6.0(43.50 mg/g),and no obvious dissolution of calcium carbonate was observed in the pH range of 6.0-8.0.The ad-sorption performance of EICP-modified biochar was significantly better than that of unmodified biochar and the control samples.After five adsorption-desorption cycles,the adsorption capacity remained 78.6%of the initial value,showing good cyclic stability.关键词
酶诱导碳酸钙沉淀/稻壳生物炭/四环素/吸附动力学/吸附等温线/SEM-EDSKey words
enzyme-induced calcium carbonate precipitation(EICP)/rice husk biochar/tetracycline(TC)/adsorption kinetics/adsorption isotherm/SEM-EDS(scanning electron microscope-X-ray energy dispersive spectrum)分类
资源环境引用本文复制引用
邵迎寒,伍玲玲..EICP改性稻壳生物炭吸附四环素的性能研究[J].南华大学学报（自然科学版）,2026,40(2):41-48,8.基金项目
地球深部探测与矿产资源勘查国家科技重大专项(2025ZD1010700 （）
2025ZD1010708) （）
