Phosphorus-modified biochar has been proven to enhance the precipitation and complexation of heavy metal ions from wastewater.However,the current modification methods require large amounts of exogenous P and have high...Phosphorus-modified biochar has been proven to enhance the precipitation and complexation of heavy metal ions from wastewater.However,the current modification methods require large amounts of exogenous P and have high energy consumption.Hence,this study proposes and analyzes a strategy integrating biochar production,phosphorus wastewater treatment,dephosphorization waste recovery,and heavy metal removal.“BC-Ca-P”was derived from Ca-modified biochar after phosphorus wastewater treatment.The adsorption of Pb(II)by BC-Ca-P followed the Langmuir isotherm and pseudo-second-order kinetic models.The maximum adsorption capability of 361.20 mg·g^(−1)at pH 5.0 for 2 h was markedly greater than that of external phosphorous-modified biochar.The adsorption mechanisms were dominated by chemical precipitation and complexation.Furthermore,density functional theory calculations indicated that oxygen-containing functional groups(P-O and C-O)contributed the most to the efficient adsorption of Pb(II)onto BC-Ca-P.To explore its practical feasibility,the adsorption performance of BC-Ca-P recovered from an actual environment was evaluated.The continuous-flow adsorption behavior was investigated and well-fitted utilizing the Thomas and Yoon-Nelson models.There was a negligible P leakage risk of BC-Ca-P during heavy metal treatment.This study describes a novel and sustainable method to utilize dephosphorization waste for heavy metal removal.展开更多
基金supported by the National Natural Science Foundation of China(42107081)the Fundamental Research Funds for the Central Public Research Institutes(2023-jbkyywf-dzl).
文摘Phosphorus-modified biochar has been proven to enhance the precipitation and complexation of heavy metal ions from wastewater.However,the current modification methods require large amounts of exogenous P and have high energy consumption.Hence,this study proposes and analyzes a strategy integrating biochar production,phosphorus wastewater treatment,dephosphorization waste recovery,and heavy metal removal.“BC-Ca-P”was derived from Ca-modified biochar after phosphorus wastewater treatment.The adsorption of Pb(II)by BC-Ca-P followed the Langmuir isotherm and pseudo-second-order kinetic models.The maximum adsorption capability of 361.20 mg·g^(−1)at pH 5.0 for 2 h was markedly greater than that of external phosphorous-modified biochar.The adsorption mechanisms were dominated by chemical precipitation and complexation.Furthermore,density functional theory calculations indicated that oxygen-containing functional groups(P-O and C-O)contributed the most to the efficient adsorption of Pb(II)onto BC-Ca-P.To explore its practical feasibility,the adsorption performance of BC-Ca-P recovered from an actual environment was evaluated.The continuous-flow adsorption behavior was investigated and well-fitted utilizing the Thomas and Yoon-Nelson models.There was a negligible P leakage risk of BC-Ca-P during heavy metal treatment.This study describes a novel and sustainable method to utilize dephosphorization waste for heavy metal removal.
