Preparation of CaTiO3-porous geopolymer photodegradation adsorbent from Ti-bearing blast furnace slag
WANG Kun1, ZHU Li-yun1, LI Peng2, WANG Zhen-bo1, GUO Hong-wei2
1. School of New Energy, China University of Petroleum, Qingdao 266580, Shandong, China; 2. Shagang College of Iron and Steel, Soochow University, Suzhou 215127, Jiangsu, China
Abstract：As a solid waste, titanium-bearing blast furnace slag has a huge stock in China, and its titanium components are difficult to be extracted, resulting in that the comprehensive utilization of titanium-bearing blast furnace slag has not been effectively solved. In view of current problems for low utilization rate and low added value of titanium-bearing blast furnace slag, and based on its composition characteristics, through the methods of selective crystallization (CaTiO3 advantageous precipitation) and alkali excitation, CaTiO3-porous geopolymer composite material was prepared. The experimental results show that the advantageous precipitation of CaTiO3 can be promoted by crystallization temperature of 1 400 ℃ and heat preservation for 1 h, while the remaining oxides exist in the form of glass phase. The CaTiO3-porous geopolymer composite material was combined with the advantages of CaTiO3 high photocatalytic activity and large specific surface area of porous geopolymer. The maximum adsorption capacity of prepared CaTiO3-porous geopolymer material for methylene blue was up to 60.4 mg/g, which had excellent adsorption effect. The removal rate of methylene blue could reach 94.5% under the conditions of 20 mg dosage, 2 h adsorption and 3 h photodegradation, which had a good application prospect in the field of organic pollution control.
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2022, Vol. 32 
