含钛高炉渣制备CaTiO3-多孔地质聚合物光降解吸附材料

含钛高炉渣作为固体废弃物,国内存量巨大,且其中的钛组元难以提取,导致含钛高炉渣综合利用一直没有得到有效解决。针对当前含钛高炉渣利用率低、附加值低等问题,基于含钛高炉渣成分特点,通过选择性析晶(CaTiO₃优势析出)、碱激发,制备出CaTiO₃-多孔地质聚合物的复合材料。试验结果表明,析晶温度1 400 ℃、保温1 h能够促进CaTiO₃的优势析出,而剩余氧化物以玻璃相形式存在。制备出的CaTiO₃-多孔地质聚合物材料结合了CaTiO₃高光催化活性与多孔地质聚合物比表面积大的优点,对亚甲基蓝具有优异的吸附效果,最大吸附量可达60.4 mg/g。在投加量为50 mg,2 h吸附、3 h光降解条件下,对亚甲基蓝去除率可达94.5%,在治理有机污染领域有良好的应用前景。

Preparation of CaTiO3-porous geopolymer photodegradation adsorbent from Ti-bearing blast furnace slag

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.