Preliminary Study on Adsorption Effect and Mechanism of Cd2+by Composite Microbial Inoculant with Lignite Humic Acids
The composite microbial inoculant with lignite humic acids and cadmium ions(Cd2+)as research objects,Cd2+adsorption was performed.The influence of the composite microbial inoculant dosage and pH level was examined.Additionally,the adsorption mechanism of the composite microbial inoculant on Cd2+was preliminarily explored through a comprehensive analysis of its morphology and adsorption kinetics before and after the adsorption process.The results indicated that the composite microbial inoculant could effectively adsorb Cd2+,The dosage and pH had significant influence on the adsorption effect of Cd2+.The optimal conditions for adsorption were found to be a composite microbial inoculant dosage of 12 g/L and a pH of 5.Under these conditions,the maximum adsorption capacity of Cd2+reached 3.942 mg/g,with an adsorption rate of 94.62%.Furthermore,the adsorption kinetics of the composite microbial inoculant followed a quasi-second-order kinetic equation,suggesting a single molecular layer adsorption mechanism.The morphological analysis revealed that the surface layer structure of the composite microbial inoculant disappeared upon adsorption,resulting in a rougher and more uneven surface.Furthermore,the components of Cd on the absorbed surface were higher than the raw lignite,which indicated the capability of Cd2+by composite microbial inoculant with lignite humic acids was improved.
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