重金属化学试剂的回收再利用——以“三氯化六氨合钴实验”为例

doi:10.3866/PKU.DXHX201903034

University Chemistry ›› 2019, Vol. 34 ›› Issue (9): 101-105.doi: 10.3866/PKU.DXHX201903034

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Recycle of Heavy Metal Chemical Reagents: A Case Study of "Preparation and Analyses of Complex[Co(NH₃)₆]Cl₃"

Xiaocong TIAN,Changsheng LU,Fengbin WANG,Bin LIU,Haifeng MA,Qing WANG*()

National Demonstration Center for Experimental Chemistry Education(Nanjing University), School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China

Received:2019-03-31 Accepted:2019-05-15 Published:2019-06-12
Contact: Qing WANG E-mail:wangqing@nju.edu.cn
Supported by:
国家基金委基础科学人才培养基金条件建设项目(J1210030);南京大学“十三五”实验教学改革研究课题(SY201703)

Abstract

Abstract:

A new experiment, Recycle of cobalt and silver, has been designed, based on the original experiment "Preparation and analyses of complex[Co(NH₃)₆]Cl₃". Both cobalt and silver are heavy metals, which can cause serious environmental pollution. In our experiments, cobalt chloride was recovered from the product[Co(NH₃)₆]Cl₃, and silver nitrate was extracted from the byproduct in the process of chlorine content determination. Therefore, both the above-mentioned heavy metals can be recycled. Our experimental design has been proved to be able to promote studying interests of students, enhance environmental awareness of students, and in the meantime reduce experimental costs.

Key words: General chemistry experiment, Heavy metal, Recycling of reagents

Xiaocong TIAN,Changsheng LU,Fengbin WANG,Bin LIU,Haifeng MA,Qing WANG. Recycle of Heavy Metal Chemical Reagents: A Case Study of "Preparation and Analyses of Complex[Co(NH₃)₆]Cl₃"[J].University Chemistry, 2019, 34(9): 101-105.

Figures/Tables 3

References 13

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实验序号	m(三氯化六氨合钴)/g	m(氯化钴)/g	回收率/%
1	2	0.95	97.94
2	3	1.44	98.63

实验方案	实验条件	m(AgCl)/g(原料)	m(AgNO₃)/g(产品)	转化率/%	纯度/%
固相反应	Zn粉1.5 g	5.00	4.96	83.7	96.32
氨性介质	Zn片3 g	5.00	3.51	59.2	95.72
氨性介质	铜片	5.00	4.59	77.4	99.47
氨性介质	Zn粉1.5 g	5.00	4.84	81.6	93.52
氨性介质	Zn粉1.13 g	5.00	4.52	76.2	81.22
甲醛还原	37%甲醛5mL	5.00	4.40	74.2	99.13

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Recycle of Heavy Metal Chemical Reagents: A Case Study of "Preparation and Analyses of Complex[Co(NH₃)₆]Cl₃"

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Recycle of Heavy Metal Chemical Reagents: A Case Study of "Preparation and Analyses of Complex[Co(NH₃)₆]Cl₃"