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The removal characteristics and mechanisms of polystyrene microplastics with various induced photoaging degrees by CuFe2O4
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2023-06-02 , DOI: 10.1016/j.seppur.2023.124245
Xue Zhang , Yunbo Zhai , Zhexian Wang , Xiaoping Liu , Xiangmin Liu , Yin Zhou , Guangli Liu , Min Xu

Environmental microplastics play an important role in the transmission of pollutants due to their complex properties. To remove microplastics from water, a magnetic material CuFe2O4 was used to remove microplastics with different photoaging degrees, which has the advantage of being fast and efficient. CuFe2O4 had an excellent characteristic in the removal of polystyrene microplastics and its superparamagnetic nature ensured its magnetic recovery. When the dosage of CuFe2O4 was 0.2 g L−1, the removal efficiencies of 98.02, 94.07 and 96.93% could be achieved for the pristine, aged 36 h and aged 84 h polystyrene microplastics (PSMP) with initial concentration of 0.04 g L−1, respectively. In addition, the high removal efficiency was also achieved in actual water. The impacts of different environmental factors on the removal efficiency were in the order of dissolved organic pollutants > pH > salt ion concentration. Hydrogen bonding played a key role in the removal of pristine polystyrene microplastics and the destruction of C = O by Fe-OOH also played an important role in the removal of aged polystyrene microplastics. Pyrolysis at 500 °C of 4 h can regenerate it, and the removal efficiency for PSMP can still reach 83.88% after four times of reuse.



中文翻译:

CuFe2O4对不同光老化程度聚苯乙烯微塑料的去除特性及机理

环境微塑料由于其复杂的特性,在污染物的传输中起着重要作用。为了去除水中的微塑料,采用磁性材料CuFe 2 O 4去除不同光老化程度的微塑料,具有快速高效的优点。CuFe 2 O 4在去除聚苯乙烯微塑料方面具有优异的特性,其超顺磁性确保了其磁性恢复。当CuFe 2 O 4的用量为0.2 g L −1,初始浓度为0.04 g L -1的原始、老化36 h和老化84 h的聚苯乙烯微塑料(PSMP)的去除效率分别为98.02%、94.07%和96.93% 。此外,在实际水中也实现了高去除效率。不同环境因素对去除率的影响顺序为溶解性有机污染物>pH值>盐离子浓度。氢键在去除原始聚苯乙烯微塑料中起着关键作用,而 Fe-OOH 对 C = O 的破坏在去除老化聚苯乙烯微塑料中也起着重要作用。500℃热解4h可再生,重复使用4次后对PSMP的去除率仍可达到83.88%。

更新日期:2023-06-02
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