水热法制备γ-AlOOH对酸性大红GR的吸附性能

doi:10.19976/j.cnki.43-1448/TF.2022052

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摘要以十八水合硫酸铝为铝源,尿素为沉淀剂,采用水热合成法制备γ-AlOOH吸附剂,通过X射线衍射仪(XRD)、扫描电镜(SEM)和N₂吸附-脱附法对γ-AlOOH的显微结构与形貌,以及对酸性大红GR的吸附性能进行分析与测试,研究吸附时间、酸性大红GR溶液的初始pH和初始质量浓度对γ-AlOOH吸附酸性大红GR的影响。结果表明,γ-AlOOH吸附剂为核-壳微米花分级结构,纯度较高,比表面积为205.07 m²/g,平均孔径为3.07 nm。在酸性大红GR溶液的初始质量浓度为300 mg/L、体积为200 mL、pH值为2、温度为25 ℃条件下,1 g γ-AlOOH吸附剂对酸性大红GR的吸附量达470.65 mg,酸性大红GR脱除率为78.44%,吸附过程的吸附动力学符合准二级动力学模型,吸附热力学符合Langmuir热力学模型;经过8次循环吸附后,1 g再生吸附剂对质量浓度为300 mg/L的溶液中酸性大红GR的吸附量仍达到422.57 g,脱除率为70.43%。

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	吕凤程
	王丁
	李中林
	李玉平
	李义兵
	何贵香

关键词 ： γ-AlOOH, 核-壳微米花, 酸性大红GR, 吸附动力学, 吸附热力学

Abstract：Using aluminum sulfate octadecahydrate as the aluminum source and urea as the precipitant, the γ-AlOOH adsorbent was prepared by hydrothermal synthesis. The microstructure, morphology and adsorption performance of γ-AlOOH were analyzed and tested by X-ray diffractometer (XRD), scanning electron microscope (SEM) and N₂ adsorption-desorption method. The effects of adsorption time, initial pH and initial mass concentration of acidic scarlet GR solution on the adsorption performance of acid scarlet GR by γ-AlOOH were studied as well. The results show that the γ-AlOOH adsorbent has a core-shell micron-flower hierarchical structure with high purity, a specific surface area of 205.07 m²/g, and an average pore size of 3.07 nm. When the initial mass concentration of the acid scarlet GR solution is 300 mg/L, the volume is 200 mL, the pH value is 2, and the temperature is 25 ℃, the adsorption amount of acid scarlet GR by 1 g γ-AlOOH reaches 470.65 mg, the removal rate is 78.44%. The adsorption kinetics of the adsorption process conforms to the pseudo-second-order kinetic model, and the adsorption thermodynamics conforms to the Langmuir thermodynamic model. After 8 cycles of adsorption, the adsorption amount of acid scarlet GR by 1 g γ-AlOOH regenerated adsorbent in 300 mg/L acid scarlet GR solution can still reach 422.57 mg, and the removal rate is 70.43%.

Key words： γ-AlOOH core-shell micron-flower acid scarlet GR adsorption kinetics adsorption thermodynamics

收稿日期: 2022-04-19 出版日期: 2022-11-15

ZTFLH:	TF821
	TQ420.6

基金资助:广西科技重大专项(桂科AA18242007)；广西创新驱动发展专项资金资助项目(桂科AA17204084)；有色金属材料及材料加工新技术教育部重点实验室开放基金资助项目(19KF-6)

通讯作者: 李义兵，教授级高级工程师，博士。电话：17776280013，E-mail: lybgems@glut.edu.cn

引用本文:

吕凤程, 王丁, 李中林, 李玉平, 李义兵, 何贵香. 水热法制备γ-AlOOH对酸性大红GR的吸附性能[J]. 粉末冶金材料科学与工程, 2022, 27(5): 550-558.
LÜ Fengcheng, WANG Ding, LI Zhonglin, LI Yuping, LI Yibing, HE Guixiang. Adsorption performance of acid scarlet GR by γ-AlOOH prepared with hydrothermal method. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 550-558.

链接本文:

http://pmbjb.csu.edu.cn/CN/10.19976/j.cnki.43-1448/TF.2022052 或 http://pmbjb.csu.edu.cn/CN/Y2022/V27/I5/550

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