To investigate the structural characteristics of artificial humic substances and study their adsorption behavior on organic pollutants,rice straw and sludge were used as raw materials to prepare humic substances through hydrolysis and hydrothermal decomposition.The influence of raw material ratio on the physicochemical properties of humic substances was examined,and the adsorption kinetics and performance of phenanthrene on humic substances were studied with phenanthrene as the target pollutant.The results showed that a 4∶1 ratio of rice straw to sludge was an ideal ratio for the preparation of raw materials.The humic substance HLS4 prepared reached adsorption equilibrium within 24 hours,and the saturated adsorption capacity of phenanthrene was 4.68 mg/g.Under the conditions of HLS4 dosage of 12 g/L and adsorption temperature of 25 ℃,the removal rate of phenanthrene is 69.9％.The adsorption process of humic substances on phenanthrene conforms to first-order and second-order kinetic models.The research results provide a basis for the potential adsorption materials of humic substances prepared by hydrothermal decomposition as soil remediation agents and the practical application of hydrolysis decomposition processes.
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