Phosphate adsorption characteristics of oil shale modified biochar
This study aims to address the challenges of phosphorus recovery and solid waste treatment by preparing biochar composites(OS-CS)using a co-pyrolysis method with cotton straw stalk and oil shale as raw materials.The physicochemical properties of the biochar were analyzed using SEM-EDS,BET and FT-IR tests.The influence of pyrolysis temperature,adsorbent dosage,and solution pH on phosphate adsorption was investigated,and both the adsorption kinetics and isotherm models were studied.The results indicated that the structural properties and surface morphology of the biochar were significantly enhanced through oil shale modification,leading to a notable improvement in phosphate adsorption capacity.At an injection level of 4.0 g/L and pH5.0,the maximum adsorption capacity reached 7.01 mg/g,which was 2.47 times higher than that of cotton straw biochar and 3.52 times higher than that of oil shale char.The adsorption process followed the proposed secondary kinetics and Langmuir isothermal adsorption model,and the mechanisms involved surface precipitation,ligand exchange,and electrostatic attraction.This approach of oil shale modified biochar composites provides a novel strategy for both phosphorus removal and solid waste resource utilization.
国家科技期刊平台
NSTL
万方数据
维普
