Cyanide ion oxidation by catalytic effect of nickel ferrites activated carbon composites

C. Feijoó, E. Torre, R. Narváez
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引用次数: 3

Abstract

BACKGROUND AND OBJECTIVES: Cyanide is a commonly-used substance in the gold recovery processes due to its high affinity for forming complexes with the precious metal, but inadequate handling and its final arrangement can lead to severe environmental contamination. In this context, this research focuses on the preparation of nickel ferrite-activated carbon catalysts for catalytic oxidation of cyanide ion in the presence of air.  METHODS: Hydrated salts of nickel (Ni(NO3)2·6H2O) and iron (Fe(NO3)3·9H2O) were used as precursors. The preparation pathways of ferrite and of ferrite-activated carbon composites were hydro-chemical with oxalic acid (C2H2O4) and co-precipitation with sodium hydroxide. The parameters evaluated for catalyst preparation were Ni/Fe molar ratios (1/1.5 and 1/2), calcination times and temperatures (2-4 h/600-900°C), and ferrite-activated carbon mass ratios in the case of composites (1/1, 1/2 and 1/3).  FINDINGS: Oxidation results showed that the ideal Ni/Fe molar ratio was 1/2, and the calcination time was 4 h at 600 and 900ᵒC for co-precipitation and hydro-chemical pathways of nickel ferrites, respectively. The catalyst that showed the greatest capacity for cyanide transformation was that obtained by the hydro-chemical pathway with oxalic acid, achieving efficiencies of 96.3% oxidation of cyanide ion. It was also determined that the largest impregnation of ferrite on the carbonaceous surface was 52.6% through the treatment with oxalic acid, with which the composite was obtained with the best catalytic properties of cyanide ion.  CONCLUSION: Nickel ferrite is able to oxidize cyanide ion to cyanate ion; being the ferrite-activated carbon combination, with which composite materials with catalytic properties of cyanide ion are obtained. Because of this, the materials studied could be applied in the detoxification of cyanurate solutions from metallurgical processes.
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镍-铁氧体-活性炭复合材料催化氰化物离子氧化
背景和目的:氰化物是金回收过程中常用的物质,因为它与贵金属形成络合物的亲和力很高,但处理和最终排列不当会导致严重的环境污染。在这种背景下,本研究的重点是制备用于在空气存在下催化氧化氰离子的镍铁氧体活性炭催化剂。方法:以镍(Ni(NO3)2·6H2O)和铁(Fe(NO3,3·9H2O)的水合盐为前驱体。铁氧体和铁氧体-活性炭复合材料的制备途径为草酸水化学和氢氧化钠共沉淀。催化剂制备的评估参数为Ni/Fe摩尔比(1/1.5和1/2)、煅烧时间和温度(2-4小时/600-900°C),以及复合材料中的铁氧体-活性炭质量比(1/1、1/2和1/3)。结果:氧化结果表明,理想的Ni/Fe摩尔比为1/2,在600和900下煅烧时间为4hᵒC分别用于镍铁氧体的共沉淀和水化学途径。表现出最大氰化物转化能力的催化剂是通过草酸的水化学途径获得的,氰化物离子的氧化效率为96.3%。通过草酸处理,铁氧体在碳质表面的最大浸渍率为52.6%,得到了对氰离子具有最佳催化性能的复合材料。结论:镍铁氧体能将氰离子氧化为氰酸根离子;作为铁氧体-活性炭的组合,可获得具有氰离子催化性能的复合材料。正因为如此,所研究的材料可以应用于冶金过程中氰尿酸盐溶液的解毒。
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来源期刊
CiteScore
7.90
自引率
2.90%
发文量
11
审稿时长
8 weeks
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