Journal
CHEMICAL ENGINEERING JOURNAL
Volume 413, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127543
Keywords
Floating photocatalyst; Decarboxylation; Holes; Microcystin-LR
Categories
Funding
- National Natural Science Foundation of China [21677152, 21876184]
- National Key Research and Development Program of China [2016YFA0203102]
- Key Research Program of Frontier Sciences, CAS [QYZDJSSWDQC020]
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The newly designed x PDDA-gC3N4-NPTEG material shows excellent ability to attack the toxic foundational groups of MC-LR and has high recycling efficiency, making it a promising method for effectively treating drinking water.
Fates of toxic foundational groups of Microcystin-LR in aqueous have garnered widespread attention because of the difficulty of removal during photocatalytic process. Here, an efficient N, P co-doped TiO2/expanded graphite (NPTEG) floating material (NPTEG) modified by poly dimethyl diallyl ammonium chloride (PDDA) and graphitic carbon nitride (g-C3N4) (x PDDA-g-C3N4-NPTEG) was assembled and used to destroy the toxic foundational groups of MC-LR in water. g-C3N4 can match well with TiO2 to form heterojunction where holes can gather in the valence band of g-C3N4. PDDA is used to passivate the g-C3N4, and performs as holes transport layer during the photocatalytic process to promote the separation of electron-hole pairs. Under the direct interaction of photogenerated holes and free carboxyl groups of MC-LR adsorbed on the surface, the decarboxylation process in the free acid groups on D-glutamic acid (Glu) and methyl-D-aspartic acid (D-MeAsp) of MC-LR occurred which was authenticated by UPLC-ESI-MS/MS. Meanwhile, the conjugated double bond was also removed by hydroxylation, so as to achieve the goal of non-toxic site residues in the degradation process. Furthermore, the degradation byproducts toxicity and photocatalysts stability were explored. The results confirm that x PDDA-gC3N4-NPTEG exhibits excellent attacking ability of carboxylic acid groups of MC-LR and high recycle ability, which has great promise as a means of effectively treating drinking water.
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