Henan Province Engineering Research Center of Environmental Laser Remote Sensing Technology and Application, Nanyang Normal University, Nanyang 473001, China.
Collaborative Innovation Center of Water Security for Water Source Region of Mid-Line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, Nanyang 473001, China.
Int J Environ Res Public Health. 2022 Jul 24;19(15):9006. doi: 10.3390/ijerph19159006.
To study the removal effect of bottom ash of biomass power plants and its modified products on zinc (Zn) in aqueous solution, a series of indoor experiments is carried out. The aim of this work is to explore a method to improve the ability of biomass ash to remove Zn from aqueous solution and obtain its adsorption characteristics of Zn in aqueous solution; on this basis, the feasibility of its application in the treatment of Zn-contaminated wastewater is analyzed. The mesoporous siliceous material is used to modify the biomass, and the modified material is functionalized with 3-aminopropyltriethoxysilane. The results show that the specific surface area of modified biomass ash is nine times that of the material before modification. The adsorption capacity of Zn on the material increases with the increase of pH, and pH 6 is the optimum pH to remove Zn from the aqueous solution. The Langmuir model and Freundlich model can show better fits for biomass ash and the modified material, respectively. Thermodynamic analysis results show that the adsorption of Zn is spontaneous and endothermic in nature. The adsorption of Zn onto biomass and modified biomass ash follow pseudo-first-order and pseudo-second-order kinetics, respectively.
为研究生物质发电厂底灰及其改性产物对水溶液中锌（Zn）的去除效果，进行了一系列室内实验。本工作旨在探索一种提高生物质灰去除水溶液中 Zn 能力的方法，并获得其在水溶液中吸附 Zn 的特性；在此基础上，分析其在处理 Zn 污染废水中的可行性。采用介孔硅材料对生物质进行改性，并用 3-氨丙基三乙氧基硅烷对改性材料进行功能化。结果表明，改性后生物质灰的比表面积是改性前材料的九倍。Zn 在材料上的吸附容量随 pH 值的增加而增加，从水溶液中去除 Zn 的最佳 pH 值为 6。Langmuir 模型和 Freundlich 模型分别能更好地拟合生物质灰和改性材料。热力学分析结果表明，Zn 的吸附在本质上是自发和吸热的。Zn 吸附到生物质和改性生物质灰上分别遵循准一级和准二级动力学。
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