Simultaneous Removal of TCE and Cr(Ⅵ) in Groundwater by Using Bentonite-supported Nanoscale Fe/Ni

Ri-xin DENG; Wei-jia LUO; Yi-tong HAN; Zhi-xiong LI; Jia-wei CHEN

doi:10.15898/j.cnki.11-2131/td.201801280013

Rock and Mineral Analysis > 2018 > 37(5): 541-548. > DOI: 10.15898/j.cnki.11-2131/td.201801280013

Ri-xin DENG, Wei-jia LUO, Yi-tong HAN, Zhi-xiong LI, Jia-wei CHEN. Simultaneous Removal of TCE and Cr(Ⅵ) in Groundwater by Using Bentonite-supported Nanoscale Fe/Ni[J]. Rock and Mineral Analysis, 2018, 37(5): 541-548. DOI: 10.15898/j.cnki.11-2131/td.201801280013

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Simultaneous Removal of TCE and Cr(Ⅵ) in Groundwater by Using Bentonite-supported Nanoscale Fe/Ni

1.
State Key Laboratory of Biogeology and Environmental Geology, Beijing 100083, China
2.
School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
3.
School of Environment and Energy Engineering, Beijing University of Civil Engineer and Architecture, Beijing 102616, China

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Received Date: January 27, 2018
Revised Date: April 01, 2018
Accepted Date: June 10, 2018
Published Date: August 31, 2018

Abstract

HIGHLIGHTS
(1) Coexisting TCE and Cr(Ⅵ) were simultaneously and efficiently removed by B-Fe/Ni.

(2) Fast Fe-Cr co-precipitation occupied reactivity sites of B-Fe/Ni and inhibited TCE degradation.

(3) TCE degradation by B-Fe/Ni was completely dechlorinated.

ABSTRACT

BACKGROUNDThe injection of nanoscale zero valent iron particles (nZVI) into groundwater has been recently developed as an in-situ groundwater remediation technology. Most researches focused on how to remove a single type pollutant and the related mechanism. However, cases on the coexisting multiple pollutants in groundwater should not be ignored.
OBJECTIVESTo synthesize the bentonite-supported nanoscale Fe/Ni bimetals(B-Fe/Ni), in order to remove typical pollutants of trichloroethylene (TCE) and hexavalent chromium[Cr(Ⅵ)] which exhibit high reactivity and are more stable to remediate contaminated water. Also, to assess the performance of B-Fe/Ni on the removal of coexisting TCE and Cr(Ⅵ) and to determine the reaction mechanism.
METHODSB-Fe/Ni was synthesized by one-step method and the batch experiments were conducted on the removal of TCE coexisted with different concentration of Cr(Ⅵ) by B-Fe/Ni. The samples of B-Fe/Ni were characterized before and after the reaction, and the contents of TCE and Cr(Ⅵ) were also monitored.
RESULTSB-Fe/Ni can efficiently remediate Cr(Ⅵ) and TCE in water. B-Fe/Ni (1 g/L) could completely remove Cr(Ⅵ) (50 mg/L) in 2 h in the presence of coexisting TCE (0.1 mmol/L). However, the degradation rate of TCE by B-Fe/Ni was decreased with increased initial concentration of Cr(Ⅵ) (0, 10, 30, 50 mg/L). According to TEM-EDS and XPS for B-Fe/Ni before and after reaction, it is shown that Fe-Cr co-precipitation from the fast interaction of B-Fe/Ni with Cr(Ⅵ) occupied the reactive sites on the surface of B-Fe/Ni, mitigating the degradation of TCE. According to the final products of TCE degradation, it is shown that TCE was completely dechlorinated.
CONCLUSIONSB-Fe/Ni is suitable for the remediation of groundwater combined pollution. In practical applications, it is necessary to consider the mutual influence of multiple pollutants and select the appropriate reagent dosage and injection method. The proposed method has important theoretical significance and application for the development of ZVI repair technology.

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References (31)

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Simultaneous Removal of TCE and Cr(Ⅵ) in Groundwater by Using Bentonite-supported Nanoscale Fe/Ni

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