Performance Study of Modified Biochar for Phosphorus Adsorption in Water Bodies
Modified charcoal(MCC)was made from corn cobs pretreated by NH3·H2O and impregnated with MgCl2·6H2O.The morphology and functional groups of MCC was characterized,and its impact on phosphate phosphorus adsorption was investigated.The results showed that MCC had a more porous structure,with a BET surface area of 2.04 times that of pristine biochar.Additionally,MCC had more carbonyl functional groups,and a higher capacity for phosphorus adsorption.When the initial phosphorus concentration was 40 mg/L,the phosphorous adsorption by MCC reached 16.59 mg/g.In simulated ad-sorption,the ideal adsorption conditions were found to be at pH 6 and 25 ℃.When the initial phosphorus concentration is between 0 and 60 mg/L,the adsorption capacity of MCC increases with the increase in phosphorus content.The adsorption process followed the pseudo-secondary kinetic model and the Lang-muir and Freundlich models,with both single molecular layer chemical adsorption and multi molecular layer physical adsorption.The theoretical saturation adsorption capacity of 32.60 mg/g demonstrated the potential for phosphorus removal from wastewater.
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