National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, No. 1 Daxue Road, Xuzhou 221116, China.
Shandong Xuanyuan Scientific Engineering and Industrial Technology Research Institute Co., Ltd., Longgu, Juye, Heze 274918, China.
Molecules. 2021 Oct 10;26(20):6116. doi: 10.3390/molecules26206116.
A large amount of coal gasification slag is produced every year in China. However, most of the current disposal is into landfills, which causes serious harm to the environment. In this research, coal gasification fine slag residual carbon porous material (GFSA) was prepared using gasification fine slag foam flotation obtained carbon residue (GFSF) as raw material and an adsorbent to carry out an adsorption test on waste liquid containing methylene blue (MB). The effects of activation parameters (GFSF/KOH ratio mass ratio, activation temperature, and activation time) on the cation exchange capacity (CEC) of GFSA were investigated. The total specific surface area and pore volume of GSFA with the highest CEC were 574.02 m/g and 0.467 cm/g, respectively. The degree of pore formation had an important effect on CEC. The maximum adsorption capacity of GFSA on MB was 19.18 mg/g in the MB adsorption test. The effects of pH, adsorption time, amount of adsorbent, and initial MB concentration on adsorption efficiency were studied. Langmuir isotherm and quasi second-order kinetic model have a good fitting effect on the adsorption isotherm and kinetic model of MB.
中国每年产生大量的煤气化渣。然而，目前大部分的处理方法是将其填埋，这对环境造成了严重的危害。在这项研究中，以煤气化细渣泡沫浮选得到的碳渣（GFSF）为原料，制备了煤气化细渣残炭多孔材料（GFSA），并将其用作吸附剂对含有亚甲基蓝（MB）的废液进行吸附试验。考察了活化参数（GFSF/KOH 质量比、活化温度和活化时间）对 GFSA 阳离子交换容量（CEC）的影响。CEC 最高的 GSFA 的总比表面积和孔体积分别为 574.02 m/g 和 0.467 cm/g。孔形成程度对 CEC 有重要影响。在 MB 吸附试验中，GFSA 对 MB 的最大吸附容量为 19.18 mg/g。研究了 pH 值、吸附时间、吸附剂用量和初始 MB 浓度对吸附效率的影响。Langmuir 等温线和拟二级动力学模型对 MB 的吸附等温线和动力学模型具有良好的拟合效果。
