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Chemosphere. 2020 Mar;242:125202. doi: 10.1016/j.chemosphere.2019.125202. Epub 2019 Oct 25.

Promoted liquid-phase hydrodechlorination of chlorophenol over Raney Ni via controlling base: Performance, mechanism, and application.

Author information

1
The Institute for Advanced Study of Coastal Ecology, School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China; Fujian Provincial Colleges and University Engineering Research Center of Solid Waste Resource Utilization, Longyan University, Longyan, 364012, China.
2
The Institute for Advanced Study of Coastal Ecology, School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China.
3
School of Environment and Materials Engineering, Yantai University, Yantai, 264005, China.
4
Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.
5
Alliance Pharma, Inc. 17 Lee Boulevard Malvern, PA, 19355, USA.
6
The Institute for Advanced Study of Coastal Ecology, School of Resources and Environmental Engineering, Ludong University, Yantai, 264025, China. Electronic address: chxia_ldu@163.com.

Abstract

The potential effect of base on Raney Ni-catalyzed hydrodechlorination (HDC) of chlorophenol was studied. Compared to weak inorganic bases, strong inorganic bases (NaOH and KOH) and triethylamine (Et3N) were more favorable to promote Raney Ni-catalyzed HDC reaction. Moreover, a stoichiometric amount of NaOH/Et3N was found to be optimal for the HDC reaction, and up to 100% conversion of 4-chlorophenol was achieved within 30 min. Catalyst characterization (SEM, EDXS, and XRD) combined with ICP-OES analysis were introduced to better understand the mechanism for the promoted effect of base on the HDC reaction. The results showed that the optimal amount of strong inorganic bases and Et3N efficiently eliminated HCl corrosion to Raney Ni, greatly reduced the active phase Ni and Al leaching, and avoided collapse of the catalyst framework. Based on the mechanism, the best bases and their optimal amount were developed for further disposal of polychlorinated phenols, and excellently stepwise HDC of polychlorinated phenols was achieved. Recycling tests showed that Raney Ni could be reused at least 5 times for the HDC reaction with the stoichiometric amount of NaOH, which was a promising option for the HDC of wastewater containing chlorophenols over Raney Ni.

KEYWORDS:

Base; Chlorophenol; Hydrodechlorination (HDC); Promote; Raney Ni

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