Feasible synthesis of coal fly ash based porous composites with multiscale pore structure and its application in Congo red adsorption
Feasible synthesis of coal fly ash based porous composites with multiscale pore structure and its application in Congo red adsorption
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DOI：
10.1016/j.chemosphere.2022.134136
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发表时间：
2022-03-11
期刊：
影响因子：
8.8
通讯作者：
Liu, Kaiqi
中科院分区：
文献类型：
--
作者：
Sun, Guangchao;Zhang, Jiayu;Liu, Kaiqi
面对日益增多的固体废弃物粉煤灰难以妥善处理和利用的巨大挑战，本文报道了一类新型低成本高连通孔隙率粉煤灰多孔材料。在此基础上，通过将层状双氢氧化物（LDH）修饰在内孔道表面，设计并构建了具有从纳米到宏观多尺度孔结构的复合材料。这种具有三维通孔结构的多孔材料显示出高的互连孔隙率（高达77.61%）、合适的压缩强度（高达23.79 MPa）和显著的水渗透通量（在0.1 MPa下为549.86 m（3）.m（-2）.h（-1））。考察了投加量、初始浓度、pH、温度和接触时间对模拟废水中刚果红（CR）的吸附效果。该复合材料具有良好的吸附效率为-100%，吸附容量为45.79 mg/g。吸附动力学符合准二级动力学方程，等温吸附符合Langmuir吸附等温式。这表明，低成本和生态友好的粉煤灰复合材料在工业规模的废水处理中具有潜在的应用。本研究也为设计和利用粉煤灰多孔材料进行过滤和吸附提供了一般策略。
Facing the great challenge that the increasing solid waste fly ash is difficult to treat and utilize properly, this paper reports a class of novel low-cost fly ash porous materials with high interconnected porosity fabricated by a facile foaming process. On this basis, composites with multiscale pore structures from the nanometer to macroscopic scale were designed and constructed by decorating layered double hydroxide (LDH) onto the inner channel surface. Such porous materials with 3D through-hole structures showed high interconnected porosity (up to 77.61%), suitable compressive strength (up to 23.79 MPa) and significant water permeation flux (549.86 m(3).m(-2).h(-1) at 0.1 MPa). Moreover, the adsorption effect of dosage, initial concentration, pH, temperature and contact time on Congo red (CR) from simulated wastewater was investigated. The composites exhibited a good adsorption efficiency of -100% and adsorption capacities of 45.79 mg/g. The adsorption kinetic can be explained well by the pseudosecond-order kinetic equation and isotherm adsorption followed Langmuir isotherm model. This suggests that low-cost and eco-friendly fly ash composites have potential applications in industrial-scale wastewater treatment. This work also provides a general strategy to design and utilize fly ash porous materials for filtration and adsorption.