Removing of Disinfection By-Product Precursors from Surface Water by Using Magnetic Graphene Oxide.

Zhongmou Liu,Wu Yang,Jinghui Wu,Hongliang Huo,Mingxin Huo,Xianze Wang,Zhen Luo

doi:10.1371/journal.pone.0143819

Abstract

The magnetic graphene oxide (MGO) was successfully synthesised by the in situ chemical co-precipitation method with Fe3+, Fe2+ and graphene oxide (GO) in laboratory and, was used as an adsorbent for disinfection by-product (DBP) precursors removing from four natural surface water samples. The results indicate that various DBPs formation significantly decreased by 7–19% to 78–98% for the four samples after MGO treatment and, the treatment process was rapidly reached equilibrium within 20 minutes. The DBP precursors removal efficiency decreased with the increasing pH value from 4 to 10. Hydrophobic compounds (humic acid and fulvic acid) are more sensitive to MGO, whereas hydrophilic and nitrogenous compounds (aromatic proteins) are more insensitive. MGO could be regenerated by using 20% (v/v) ethanol and, the DBP precursors removal efficiency can stay stable after five cycles. These results indicate that MGO can be utilized as a promising adsorbent for the removal of DBP precursors from natural surface water.

Highlights

Disinfection by-products (DBPs) formation in the treatment of drinking water could cause long-term adverse health effects on humans
The fourier transform infrared spectroscopy (FTIR) spectra of graphene oxide (GO) and magnetic graphene oxide (MGO) are shown in supplementary data S2 Fig For GO, O-H groups, C = O groups, C-O-H groups, C-O groups and C = C groups were found in FTIR spectra
MGO was successfully synthetized by the in situ chemical co-precipitation method

Summary

Introduction

Disinfection by-products (DBPs) formation in the treatment of drinking water could cause long-term adverse health effects on humans. The formation of DBPs can be controlled and minimised by using one or a combinations of the following approaches: removing of DBP precursors prior to disinfection, changing disinfectants, and removing DBPs after disinfection [2]. Among these methods, the removal of DBP precursors, i.e. natural organic matter (NOM), prior to disinfection is considered the most satisfactory [3]. Numerous DBP precursors removal methods have been reported, such as PLOS ONE | DOI:10.1371/journal.pone.0143819. Numerous DBP precursors removal methods have been reported, such as PLOS ONE | DOI:10.1371/journal.pone.0143819 December 1, 2015

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Results

Conclusion