Removal of polyethylene microplastics from water by laminarin-polymeric aluminum iron chloride
Laminarin(LA)was used as a novel coagulant aid to investigate its enhanced coagulation performance in the removal of polyethylene(PE)microplastics using polymeric aluminum ferric chloride(PAFC),and the coagulation mechanism was investigated by zeta potential,scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).The results showed that the addition of the appropriate amount of LA could improve the coagulation efficiency of PAFC on PE microplastics.The removal rates of PE microplastics by single PAFC and PAFC-LA reached 78.4％and 95.2％when the dosages of PAFC and LA were 150 mg·L-1 and 20 mg·L-1,respectively.The coagulation mechanisms of PAFC and PAFC-LA on PE microplastics were consistent,and the addition of LA significantly improved the effects of charge neutralization,adsorption bridging and sweeping flocculation of PAFC.Effecting test experiments of pH,microplastic size,coexisting ions,humic acid coexistence and actual water showed that the PAFC-LA compound coagulation system had better environmental adaptability.
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