高比表面积氧化铝微粉从碱性废水中除氟

doi:10.11896/cldb.19010220

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Abstract Effect of pH, initial fluoride concentration, duration, alumina dosage on removal rate and adsorption capacity were studied by adding the fine activated alumina, and removal mechanism was then discussed. A fine activated alumina with specific surface area of 409.03 m²·g^-1 was prepared by phase evolution from gibbsite, dawsonite, ammonia aluminate carbonate hydrate to mesoporous γ-Al₂O₃ after gibbsite precipitated from sodium aluminate solution. Results indicate that fluoride is efficiently removed within pH range from 7 to 9.4. Prolonging adsorption time, reducing fluoride concentration, and increasing alumina dosage improve removal rate. Meanwhile, increase in pH reduces zeta potential, and IEP is equal to 9.77. High specific surface area, electrostatic attraction, and multilayer adsorption contribute to adsorption capacity of 9.28 mg·g^-1 and removal rate of 94.20% in solution of pH 8.1. In addition, chemisorption is rate controlling step according to pseudo-second rate equation in removal of fluoride in alkaline solution.

Key words： activated alumina specific surface area fluoride alkaline solution removal

Published: 15 January 2020

CLC number:

TU991.266

About author:: Ting Zhangis a graduate student in School of Metallurgy and Environment, Central South University. Her research interest is the preparation of alumina powder.;Guihua Liu, a professor and doctoral supervisor, received his Doctor degree from Central South University of Technology and worked in School of Metallurgy and Environment in Central South University. He specialized in alumina chemistry and technology, theory of hydrometallurgy, clean production of chromate salts, and preparation of powder materials. He has undertaken and participated in more than 40 research projects, such as National Key Scientific and Technological Projects, the "973" Project, the National Natural Science Foundation, and China Aluminum, ALCOA (American Aluminum Corporation). In addition, 9 novel technologies have been applied in alumina refineries, more than 40 patents have been applied, and over 20 patents were granted. Over 50 papers were published, 8 projects were awarded.

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	ZHANG Ting
	LIU Guihua
	CHEN Binbin
	QI Tiangui
	ZHOU Qiusheng
	PENG Zhihong
	LI Xiaobin

Cite this article:

ZHANG Ting,LIU Guihua,CHEN Binbin, et al. Removal of Fluoride in Alkaline Solution Using Fine Alumina with High Specific Surface Area[J]. Materials Reports, 2020, 34(4): 4020-4024.

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http://www.mater-rep.com/EN/10.11896/cldb.19010220 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4020

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