Praipipat Pornsawai, Ngamsurach Pimploy, Libsittikul Nantikorn, Kaewpetch Chawanluk, Butdeesak Punpruksa, Nachaiperm Wachira
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.
Sci Rep. 2024 Jan 13;14(1):1278. doi: 10.1038/s41598-024-51934-7.
The direct red 28 (DR28) dye contamination in wastewater blocks the transmission of light into the water body resulting in the inability to photosynthesize by aquatic life. In addition, it is difficult to break down and persist in the environment, and it is also harmful to aquatic life and water quality because of its aromatic structure. Thus, wastewater contaminated with dyes is required to treat before releasing into the water body. Sugarcane bagasse beads (SBB), sugarcane bagasse modified with titanium dioxide beads (SBBT), sugarcane bagasse modified with magnesium oxide beads (SBBM), sugarcane bagasse modified with aluminum oxide beads (SBBA), and sugarcane bagasse modified with zinc oxide beads (SBBZ) for DR28 dye removal in aqueous solution, and they were characterized with several techniques of BET, FESEM-FIB, EDX, FT-IR, and the point of zero charges (pH). Their DR28 dye removal efficiencies were examined through batch tests, adsorption isotherms, and kinetics. SBBM had the highest specific surface area and pore volume, whereas its pore size was the smallest among other materials. The surfaces of SBB, SBBM, SBBT, and SBBA were scaly sheet surfaces with an irregular shape, whereas SBBZ was a coarse surface. Oxygen, carbon, calcium, chloride, sodium, O-H, C-H, C=O, C=C, and C-O-C were found in all materials. The pH of SBB, SBBT, SBBM, SBBA, and SBBZ were 6.57, 7.31, 10.11, 7.25, and 7.77. All materials could adsorb DR28 dye at 50 mg/L by more than 81%, and SBBM had the highest DR28 dye removal efficiency of 94.27%. Langmuir model was an appropriate model for SBB, whereas Freundlich model was a suitable model for other materials. A pseudo-second-order kinetic model well described their adsorption mechanisms. Their adsorptions of the DR28 dye were endothermic and spontaneous. Therefore, they were potential materials for adsorbing DR28 dye, especially SBBM.
废水中的直接红28（DR28）染料污染会阻碍光线传入水体，导致水生生物无法进行光合作用。此外，它难以分解且会在环境中持续存在，因其芳香结构还对水生生物和水质有害。因此，被染料污染的废水在排入水体之前需要进行处理。采用甘蔗渣珠（SBB）、用二氧化钛珠改性的甘蔗渣（SBBT）、用氧化镁珠改性的甘蔗渣（SBBM）、用氧化铝珠改性的甘蔗渣（SBBA）以及用氧化锌珠改性的甘蔗渣（SBBZ）去除水溶液中的DR28染料，并通过比表面积测定（BET）、场发射扫描电子显微镜-聚焦离子束（FESEM-FIB）、能谱分析（EDX）、傅里叶变换红外光谱（FT-IR）以及零电荷点（pH）等多种技术对它们进行表征。通过批次试验、吸附等温线和动力学研究考察了它们对DR28染料的去除效率。SBBM具有最高的比表面积和孔体积，而其孔径在其他材料中最小。SBB、SBBM、SBBT和SBBA的表面是不规则形状的鳞片状表面，而SBBZ是粗糙表面。在所有材料中均发现了氧、碳、钙、氯、钠、O-H、C-H、C=O、C=C和C-O-C。SBB、SBBT、SBBM、SBBA和SBBZ的pH分别为6.57、7.31、10.11、7.25和7.77。所有材料对50 mg/L的DR28染料的吸附率均超过81%，SBBM对DR28染料的去除效率最高，为94.27%。朗缪尔模型适用于SBB，而弗伦德里希模型适用于其他材料。准二级动力学模型很好地描述了它们的吸附机制。它们对DR28染料的吸附是吸热且自发的。因此，它们是吸附DR28染料的潜在材料，尤其是SBBM。
