Effects of pre-oxidant (KMnO<sub>4</sub>) on structure and performance of PVDF and PES membranes

Xuehui Zhao; Yan Hu; Yun Wu; Hongwei Zhang

doi:10.1016/j.cjche.2018.02.021

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Effects of pre-oxidant (KMnO₄) on structure and performance of PVDF and PES membranes

Separation Science and Engineering | Updated：2026-01-06

- Effects of pre-oxidant (KMnO₄) on structure and performance of PVDF and PES membranes
- Chinese Journal of Chemical Engineering Vol. 26, Issue 12, Pages: 2461-2470(2018)
- Affiliations：
  
  2 School of Environment and Chemical Engineering, Tianjin Polytechnic University,Tianjin,China,300387
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2018.02.021
  CLC：
- Published：2018
- Accepted：
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) on structure and performance of PVDF and PES membranes[J]. Chinese Journal of Chemical Engineering, 2018, 26(12): 2461-2470.
DOI：

) on structure and performance of PVDF and PES membranes[J]. Chinese Journal of Chemical Engineering, 2018, 26(12): 2461-2470. DOI： 10.1016/j.cjche.2018.02.021.

摘要

Abstract

The structure and performance of membrane materials are very important to the efficient and stable operation in membrane drinking water purification technology. Potassium permanganate (KMnO

)

which can change the characteristics of organic matters and control membrane surface fouling

has been widely used as pre-oxidant in the front of membrane drinking water process. This study investigates the evolution of membrane surface structure and performance when polyvinylidene fluoride (PVDF) and polyethersulfone (PES) were exposed to 10

100 and 1000 mg·L

-1

KMnO

solution for 6 and 12 d

respectively. The aged membrane physicochemical characteristics such as membrane surface morphology

chemical composition

hydrophilicity

porosity and zeta potential were evaluated by modern analytical and testing instruments. The anti-fouling property of membrane surface was also investigated by the filtration-backwash experiment. The results indicated that the different concentrations and exposure time of KMnO

led to a different variation on PVDF and PES membrane surface structure and performance

which could further affect the membrane separation performance and the

membrane fouling behaviors. The membrane surface pore size and porosity increased due to the dislodgment and degradation of membrane additive (PVP)

which improved membrane permeability and enhanced the adsorption and deposition of pollutants in the membrane pores. With the increase of exposure time

the membrane surface pore size and porosity reduced for the reactions of chain scission and crosslinking on membrane materials

and the backwashing efficiency declined

leading to a more serious irreversible fouling. Compared with PVDF membranes

the formation of sulfonic group for PES membranes increased the negative charge on membrane surface due to the oxidation of KMnO

. The present study provides some new insights for the regulation of the pre-oxidant dose and the selection of the membrane materials in KMnO

pre-oxidation combined with membrane filtration system.

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⁰

Effects of pre-oxidant (KMnO4) on structure and performance of PVDF and PES membranes

DOI：10.1016/j.cjche.2018.02.021

摘要

Abstract

关键词

Keywords

references

Effects of pre-oxidant (KMnO₄) on structure and performance of PVDF and PES membranes