煤气化渣合成4A分子筛及其吸附性能研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (6): 2251-2261.

所属专题：新型功能材料

煤气化渣合成4A分子筛及其吸附性能研究

徐啟斌^1,2, 牛香力^1,2, 陈婷婷^1,2, 陈雨欣^1,2, 李杨^1,2, 张华^1,2, 倪红卫^1,2

1.武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉 430081;
2.湖北省冶金二次资源工程技术研究中心,武汉 430081

收稿日期:2023-03-24 修订日期:2023-03-24 出版日期:2023-06-15 发布日期:2023-06-25
通信作者: 李杨,博士,副教授。E-mail:liyang2468@wust.edu.cn
作者简介:徐啟斌(2000—),男。主要从事冶金固废增值利用和纳米材料可控制备方面的研究。E-mail:keibun.xu@foxmail.com
基金资助:
国家重点研发计划(2018YFC1900602-1);省级大学生创新创业训练计划(S202210488086)

Preparation of 4A Molecular Sieve from Coal Gasification Slag and Its Adsorption Performance

XU Qibin^1,2, NIU Xiangli^1,2, CHEN Tingting^1,2, CHEN Yuxin^1,2, LI Yang^1,2, ZHANG Hua^1,2, NI Hongwei^1,2

1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources, Wuhan 430081, China

Received:2023-03-24 Revised:2023-03-24 Online:2023-06-15 Published:2023-06-25

摘要/Abstract

摘要： 本文针对煤气化渣(CGFS)资源化利用困难的问题,以CGFS为原料,采用碱熔活化-水浸-水热法合成4A分子筛。在水钠比(n(H₂O)/n(Na₂O),摩尔比)为80、硅铝比(n(SiO₂)/n(Al₂O₃),摩尔比)为2的条件下,探讨了反应时间、水热温度和前驱液老化对合成的4A分子筛物相结构和微观形貌的影响,提出了活化CGFS-P1分子筛-4A分子筛快速高效的转晶合成机理,并利用硫酸铜溶液模拟含重金属离子工业废水,测试了制备的4A分子筛对Cu²⁺的吸附性。结果表明,在100 ℃反应12 h条件下能够制备出尺寸均一且结晶良好的4A分子筛,其对Cu²⁺的吸附主要发生在前10 min,吸附率达69.7%,90 min时的最大吸附率高达97.3%,饱和吸附容量为196.4 mg/g,制备的4A分子筛表现出良好的吸附性能,为CGFS高值化利用提供了理论依据和试验基础。

关键词: 煤气化渣, 碱熔活化, 水热反应, 4A分子筛, Cu²⁺吸附, 结晶机理, 吸附性能

Abstract: In order to solve the difficult problem of comprehensive utilization of coal gasification slag (CGFS), 4A molecular sieve was synthesized with CGFS as raw material by an alkali fusion-water leaching-hydrothermal method. Under the conditions that the molar ratio of water to sodium (n(H₂O)/n(Na₂O)) is 80 and the molar ratio of silicon to aluminum (n(SiO₂)/n(Al₂O₃)) is 2, the effects of reaction time, hydrothermal temperature and precursor aging time on the phase structure and microstructure of prepared 4A molecular sieve were investigated. The phase transformation and synthesis mechanism for activated CGFS-P1 molecular sieve-4A molecular sieve were proposed. Meanwhile, the adsorption performance of the prepared 4A molecular sieve for Cu²⁺ in the solution was tested by using copper sulfate solution to simulate industrial wastewater containing heavy metal ions. The results show that 4A molecular sieve with uniform size and well crystallization could be prepared at 100 ℃ for 12 h. The adsorption of Cu²⁺ by 4A molecular sieve mainly occurrs in the initial 10 min and the adsorption rate reaches 69.7%. The saturated adsorption rate reaches 97.3% in 90 min and the saturated adsorption capacity is 196.4 mg/g. It is indicated that the prepared 4A molecular sieve exhibits good adsorption performance, which provides the theoretical and experimental foundation for the high value-added utilization of CGFS.

Key words: coal gasification slag, alkali fusion, hydrothermal reaction, 4A molecular sieve, Cu²⁺ adsorption, crystallization mechanism, adsorption performance

中图分类号:

徐啟斌, 牛香力, 陈婷婷, 陈雨欣, 李杨, 张华, 倪红卫. 煤气化渣合成4A分子筛及其吸附性能研究[J]. 硅酸盐通报, 2023, 42(6): 2251-2261.

XU Qibin, NIU Xiangli, CHEN Tingting, CHEN Yuxin, LI Yang, ZHANG Hua, NI Hongwei. Preparation of 4A Molecular Sieve from Coal Gasification Slag and Its Adsorption Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2251-2261.

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煤气化渣合成4A分子筛及其吸附性能研究

Preparation of 4A Molecular Sieve from Coal Gasification Slag and Its Adsorption Performance

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