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In this study, the nanoscale zero-valent iron/polyaniline/chitosan (nZVI/PANI/CS) composite was prepared and was used to remove tetracycline (TC) and heavy metal (Ni(II)) from the wastewater. The dispersity of composite was observed to be significantly improved. The performance of nZVI/PANI/CS composite was investigated and the removal efficiency for tetracycline and heavy metals was 98.8% and 99.0%, respectively. The removal process of TC and Ni(II) can better describe by Langmuir model and the pseudo-second-order kinetic model. And the maximum adsorption capacities of tetracycline and heavy metals are 141.84 mg/g and 165.34 mg/g. Further, the mechanism analysis shows that TC was degraded into hypotoxic or non-toxic small molecules by nZVI/PANI/CS and the most of Ni(II) was transformed into Ni 0  by reducing effect. Besides, the stability and reusability experimental was implemented, indicating the performance of nZVI was improved after adding PANI and CS.

Simultaneous adsorption and degradation tetracycline and heavy metals using polyaniline/chitosan to loading nanoscale zero-valent iron