Fe0/C诱导铜盐还原耦合化学沉淀法脱除废水硫氰酸盐

doi:10.19964/j.issn.1006-4990.2022-0116

摘要/Abstract

摘要：

焦化废水是一类伴随焦炭生产而形成的有机-无机组分共存、环境危害大的工业废水，其高含量的硫氰酸盐将毒害微生物、抑制生物活性，影响废水生化系统的稳定性，研究硫氰酸盐的资源化利用具有重要意义。采用等体积浸渍结合碳热还原法制备系列生物炭负载零价铁材料（Fe⁰/C），用X射线衍射和氮气吸-脱附技术进行物性结构表征；模拟焦化废水，利用零价铁还原铜盐耦合硫氰酸亚铜合成反应，实现硫氰酸根回收利用。表征结果表明：Fe⁰/C是无定形碳负载零价铁材料，比表面积较小（小于1 m²/g）。实验结果显示，在模拟废水硫氰酸盐质量浓度为2.50 g/L、铜盐浓度为0.03 mol/L、pH为5.5、温度为40 ℃ 条件下反应10 min，3Fe⁰/C（铁质量分数为3%）对硫氰酸盐脱除率达到99%，实现了模拟焦化废水中硫氰酸盐的高效脱除，获得了附加值较高的硫氰酸亚铜产品，丰富了焦化废水物化-生化处理技术理论。

关键词: Fe⁰/C材料, 碳热还原, 硫氰酸盐废水处理, 脱除率, 硫氰酸亚铜

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

中图分类号:

TQ138.11

贾志奇,聂慧敏,赵永祥. Fe⁰/C诱导铜盐还原耦合化学沉淀法脱除废水硫氰酸盐[J]. 无机盐工业, 2023, 55(1): 129-135.

JIA Zhiqi,NIE Huimin,ZHAO Yongxiang. Fe⁰/C induced copper salt reduction coupled with chemical precipitation method to remove thiocyanate from wastewater[J]. Inorganic Chemicals Industry, 2023, 55(1): 129-135.

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Fe⁰/C诱导铜盐还原耦合化学沉淀法脱除废水硫氰酸盐

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

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