Inorganic Chemicals Industry ›› 2023, Vol. 55 ›› Issue (1): 129-135.doi: 10.19964/j.issn.1006-4990.2022-0116

• Environment·Health·Safety • Previous Articles     Next Articles

Fe0/C induced copper salt reduction coupled with chemical precipitation method to remove thiocyanate from wastewater

JIA Zhiqi1(),NIE Huimin1,ZHAO Yongxiang1,2   

  1. 1. College of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China
    2. Engineering Research Center of Fine Chemicals,Ministry of Education,Taiyuan 030006,China
  • Received:2022-03-14 Online:2023-01-10 Published:2023-01-17

Abstract:

Coking wastewater is a kind of industrial wastewater with coexistence of organic-inorganic components and great environmental harm formed along with coke production.Its high content of thiocyanate will poison microorganisms,inhibit biological activity,and affect the stability of wastewater biochemical systems.It is of great significance to study the resource utilization of thiocyanate.A series of biochar-supported zero-valent iron materials(Fe0/C) were prepared by equal volume impregnation combined with carbothermal reduction method,and their physical properties and structures were characterized by X-ray diffraction and N2 adsorption-desorption techniques.By simulating coking wastewater,zero-valent iron was used to reduce copper salts to couple the synthesis reaction of cuprous thiocyanate to realize the recovery and utilization of thiocyanate.The characterization showed that Fe0/C was an amorphous carbon-supported zero-valent iron material with a small specific surface area(less than 1 m2/g).The experimental results showed that the thiocyanate removal rate of 3Fe0/C(3% Fe) reached 99 % with the simulated wastewater of thiocyanate concentration of 2.50 g/L,copper salt concentration of 0.03 mol/L,solution pH value of 5.5 at 40 ℃ for 10 min,and the efficient removal of thiocyanate in simulated coking wastewater was achieved.The cuprous thiocyanate products with higher added value were developed,and the technical theory of physicochemical-biochemical treatment of coking wastewater was enriched.

Key words: Fe0/C material, carbothermal reduction, thiocyanate wastewater treatment, removal rate, cuprous thiocyanate

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