水生生物学报2024，Vol.48Issue(2)：253-263,11.DOI:10.7541/2023.2023.0137
镧改性虾壳低温热解制备的生物炭对池塘养殖废水磷吸附的研究
PREPARATION OF BIOCHAR BY LOW TEMPERATURE PYROLYSIS OF LANTHANUM MODIFIED SHRIMP SHELLS FOR EFFICIENT PHOSPHORUS ADSORPTION
摘要
Abstract
In order to improve the phosphorus removal effect of biochar and resource utilization of food waste,we ob-tained lanthanum-modified biochar(CSLa)by using waste shrimp shells as raw material and attaching LaCl3 to the sur-face of shrimp shells in the form of La(OH)3 precipitation with NaOH by pyrolysis.The modified and unmodified biochar samples were characterized and analyzed by XRF,SEM,BET,FTIR and XRD.The adsorption kinetic and ad-sorption isotherm models were used to fit the phosphorus absorption characteristics of the biochar.The effects of modi-fier dosage,initial pH and coexisting interfering ions on phosphorus adsorption by biochar were investigated.The re-sults showed that lanthanum modified shrimp shell biochar(CSLa)had abundant oxygen-containing functional groups on its surface.CSLa consisted mainly of La2O3,and its pore size distribution was dominated by mesoporous pores.The phosphorus adsorption process was better fitted with Langmuir isotherm,indicating the adsorption of phosphorus on CSLa was monolayer adsorption.The adsorption of phosphorus on CSLa was better described by quasi-secondary kine-tics,indicating the phosphorus adsorption process by CSLa was chemisorption.The maximum theoretical adsorption capacity of CSLa was found to be 160.51 mg/g,achieved after 12h of adsorption.The adsorption and removal rates of phosphorus by CSLa were higher than those by CS400 at low or high phosphorus concentrations,which was more prac-tical in real aquaculture tailwater.The adsorption rate of phosphorus on CSLa was mainly controlled by chemical ad-sorption and intraparticle diffusion.The mechanism analysis indicated that surface precipitation,electrostatic attraction,ligand exchange and internal complexation were the main mechanisms of phosphorus adsorption by CSLa.CSLa demonstrated better phosphorus removal performance under weakly acidic conditions,while the adsorption capacity was relatively high under alkaline environmental conditions.The interfering ions Cl-,NO3-,NO2-and SO42-had no ef-fect on CSLa phosphorus adsorption,while HCO3 and CO3-had some inhibitory effect on CS400 phosphorus adsorp-tion.In this study,lanthanum-modified biochar was prepared at a low temperature of 400 ℃ as the pyrolysis tempera-ture,which not only enhanced the adsorption and removal rate of phosphorus by biochar,but also consumed less thermal energy,which was more beneficial to practical applications.关键词
虾壳生物炭/磷酸盐吸附/镧改性Key words
Shrimp shell biochar/Phosphate adsorption/Lanthanum modification分类
资源环境引用本文复制引用
韩孟飞,徐栋,武俊梅,曹涛涛,白国梁,陈迪松,杨夯,吴振斌..镧改性虾壳低温热解制备的生物炭对池塘养殖废水磷吸附的研究[J].水生生物学报,2024,48(2):253-263,11.基金项目
国家自然科学基金区域创新发展联合基金(U20A2010) （U20A2010）
江汉湖群清洁水产水质净化的生物——生态学基础和保障策略资助[Supported by the National Natural Science Foundation of China Regional Innovation and Development Joint Fund(U20A2010):Study on the Basis of Biology and Ecology on Water Purification During the Clean Aquaculture of Jianghan Lake group] （U20A2010）
