焦粉基Fe_(3)O_(4)/C诱导铜盐还原耦合化学沉淀法脱除废水硫氰酸盐  

Removal of thiocyanate from wastewater by chemical precipitation of copper salt induced by coke-based Fe_(3)O_(4)/C

作　　者：贾志奇[1] 张志浩 赵永祥[1,2] Jia Zhiqi;Zhang Zhihao;Zhao Yongxiang(School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,Shanxi,China;Engineering Research Center of Ministry of Education for Fine Chemicals,Shanxi University,Taiyuan 030006,Shanxi,China)

机构地区：[1]山西大学化学化工学院,山西太原030006 [2]山西大学精细化学品教育部工程研究中心,山西太原030006

出　　处：《工业催化》2023年第9期75-80,共6页Industrial Catalysis

基　　金：山西省重点研发计划项目(201703D121022-2)。

摘　　要：煤焦化过程中产生大量酚-氰-硫氰酸盐等组分复杂的工业废水,对水体生态环境具有潜在危害,研究高效的含硫氰酸盐废水处理技术具有积极的经济、环保意义。以焦粉固废为碳源,采用等体积浸渍,结合限热碳还原法制备磁性Fe_(3)O_(4)/C材料,采用XRD和N 2吸附-脱附技术进行物质结构表征,并应用于诱导铜盐化学沉淀法脱除模拟焦化废水中硫氰酸盐。XRD结果表明,负载的Fe_(3)O_(4)平均晶粒尺寸为10.8 nm,Fe_(3)O_(4)/C材料比表面积6.8 m^(2)·g^(-1)。模拟焦化硫氰酸盐废水(浓度为2.5 g·L^(-1))处理实验结果显示,在铜盐浓度为0.03 mol·L^(-1)时,采用铁质量分数20%Fe_(3)O_(4)/C催化剂(投加量1.25 g),废水初始pH=5.6,45℃下反应2 h,硫氰酸盐脱除率可达99.84%,催化剂稳定性良好;动力学模拟显示反应遵循准二级动力学模型,主要吸附过程受化学作用控制。该研究以焦粉固废为载体,制备了Fe_(3)O_(4)/C材料,通过铁铜物种协同作用,利用化学沉淀法实现了模拟废水硫氰酸盐的高效脱除,为工业化焦化废水处理提供理论支持。Wastewater containing phenol and cyanide formed in the process of coal coking would cause certain harm to water ecology.It is of positive economic and environmental value to study the efficient treatment technology of wastewater containing thiocyanate.In this study,coke powder was used as the source of carbon,and magnetic Fe_(3)O_(4)/C materials were prepared by equal volume impregnation and heat-limited carbon reduction,and then characterized by XRD and N 2 adsorption-desorption techniques.The XRD results indicate that the average grain size of Fe_(3)O_(4)loaded is 10.8 nm,and the specific surface area of Fe_(3)O_(4)/C material is 6.8 m^(2)·g^(-1).20%Fe_(3)O_(4)/C material was used to treat simulated industrial coking thiocyanate wastewater(the concentration was 2.5 g·L^(-1)).The removal efficiency can reach 99.84%when the concentration of copper salt is 0.03 mol·L^(-1),dosage of catalyst was 1.25 g,initial pH of waste water was 5.6,and the reaction temperature is 45℃for 2 h.The Fe_(3)O_(4)/C catalyst had good stabi-lity.Kinetic simulation showed that the reaction followed a quasi-second-order kinetic model,and the main adsorption process was controlled by chemical action.In this experiment,coke powder was used as a carrier to prepare Fe_(3)O_(4)/C material.Through the synergistic effect of iron and copper species,the chemical precipitation method was used to achieve the efficient removal of thiocyanate from simulated wastewater,providing theoretical support for industrial coking wastewater treatment.

关 键 词：三废处理与综合利用 焦粉 碳热还原 Fe_(3)O_(4)/C材料 硫氰酸盐废水处理 化学沉淀 

分 类 号：TQ520.9[化学工程—煤化学工程] X784[环境科学与工程—环境工程]