Jangkorn Sirirat, Youngme Sujittra, Praipipat Pornsawai
Department of Environmental Science, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
Environmental Applications of Recycled and Natural Materials (EARN) Laboratory, Khon Kaen University, Khon Kaen, 40002, Thailand.
Heliyon. 2022 Apr 22;8(4):e09323. doi: 10.1016/j.heliyon.2022.e09323. eCollection 2022 Apr.
Increasing of industrializations causes of waste management problems, so use of industrial wastes for other purposes is an alternative option not only reducing industrial wastes but also providing benefit applications. Water contaminated by heavy metals is concerned because of their toxicity, so the water treatment is required. Sugar factory and power plant create big loads of wastes which are bagasse fly ash (BFA) and coal fly ash (CFA). Since BFA and CFA have good chemical properties, they are possible to apply as raw materials for synthesis of zeolite-type adsorbents. Thus, use of these industrial wastes for heavy metal adsorptions is a good idea to accomplish for the waste management and water quality. This study presented the modified method of zeolite A synthesis by BFA and CFA for lead removals, characteristic identifications of synthesized zeolite A adsorbents, their lead adsorption efficiencies, and their adsorption isotherm and kinetics were investigated. ZBG and ZCF were synthesized, and all analytic characterizations were determined that ZBG and ZCF corresponded to zeolite A standard (STD). ZBG and ZCF were demonstrated lead removal efficiencies of 100%. The highest negatively charged of ZBG and ZCF were found at pH of 5 matched to the highest lead removal efficiencies of both zeolite A adsorbents. Adsorption isotherms and kinetics of ZBG and ZCF were corresponded to Langmuir isotherm and pseudo-second-order kinetic model. Therefore, ZBG and ZCF are potential adsorbents for environmental applications along with reducing of industrial wastes.
工业化进程的加快导致了废物管理问题，因此将工业废物用于其他目的是一种替代选择，不仅可以减少工业废物，还能带来有益的应用。受重金属污染的水因其毒性而受到关注，所以需要进行水处理。糖厂和发电厂产生大量废物，即甘蔗渣飞灰（BFA）和煤飞灰（CFA）。由于BFA和CFA具有良好的化学性质，它们有可能用作合成沸石型吸附剂的原料。因此，利用这些工业废物进行重金属吸附是实现废物管理和改善水质的一个好主意。本研究提出了用BFA和CFA合成沸石A以去除铅的改进方法，对合成的沸石A吸附剂进行了特性鉴定，研究了它们对铅的吸附效率、吸附等温线和动力学。合成了ZBG和ZCF，所有分析表征均确定ZBG和ZCF符合沸石A标准（STD）。ZBG和ZCF对铅的去除效率均为100%。ZBG和ZCF在pH值为5时带负电荷最多，这与两种沸石A吸附剂的最高铅去除效率相匹配。ZBG和ZCF的吸附等温线和动力学符合朗缪尔等温线和伪二级动力学模型。因此，ZBG和ZCF是具有环境应用潜力的吸附剂，同时还能减少工业废物。
