School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, 100083, China.
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, 100083, China.
Chemosphere. 2022 Sep;303(Pt 1):134839. doi: 10.1016/j.chemosphere.2022.134839. Epub 2022 May 7.
Since the human consumption of coal is increasingly growing and coal-based solid wastes are discharged in large quantities, the resource utilization of coal-based solid wastes has been paid more attention. In the present work, for the first time, the coal gasification fine slag is subjected to prepare ZSM-5 zeolites with ultra-low n(SiO)/n(AlO) ratios (less than 20) and hierarchical pore structures. The increase in the concentration of the alkaline extract leads to the decrease of the crystallinity, the irregularity of the microscopic morphology, and the decrease of the specific surface area, resulting in the in-situ generation of mesopores within ZSM-5. Moreover, adsorption experiments demonstrate that ZSM-5-2M exhibits the best methylene blue adsorption performance at the pH of 9 with a removal rate of up to 82.07%, and it also has good adsorption performance in simulated real water samples. Furthermore, the adsorption performance of ZSM-5-2M on the malachite green, Rhodamine B, Congo red, and methyl orange has been investigated and it is found to be very effective for the adsorption of cationic dyes, and its adsorption performance for methylene blue and malachite green is reduced in the presence of anions.
由于人类对煤炭的消耗日益增长，且煤炭基固体废物大量排放，因此煤炭基固体废物的资源利用受到了更多关注。在本工作中，首次采用煤气化细渣来制备具有超低 n(SiO)/n(AlO) 比值（小于 20）和分级孔结构的 ZSM-5 沸石。碱性萃取液浓度的增加会导致结晶度降低、微观形貌不规则和比表面积减小，从而导致 ZSM-5 内原位生成介孔。此外，吸附实验表明，ZSM-5-2M 在 pH 值为 9 时对亚甲基蓝的去除率高达 82.07%，对模拟实际水样也具有良好的吸附性能。此外，还研究了 ZSM-5-2M 对孔雀石绿、罗丹明 B、刚果红和甲基橙的吸附性能，发现其对阳离子染料的吸附性能非常有效，而阴离子的存在会降低其对亚甲基蓝和孔雀石绿的吸附性能。
