Teju Endale, Legesse Abi, Megersa Negussie
Department of Chemistry, College of Natural and Computational Sciences, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia.
Department of Chemistry, College of Natural and Computational Sciences, Haramaya University, P. O. Box 138, Haromaya, Ethiopia.
Heliyon. 2024 Feb 10;10(4):e26278. doi: 10.1016/j.heliyon.2024.e26278. eCollection 2024 Feb 29.
In this study, the non-edible part of oyster mushroom was utilized for quantitative removal of the most commonly used -triazine herbicide; atrazine and its breakdown products including deethylatrazine (DEA), hydroxyatrazine (ATOH) and deisopropylatrazine (DIA) from aqueous samples. The functional groups available on the oyster mushroom were studied applying FTIR before and after adsorption. Experimental parameters influencing the uptake process including acidity, sorbent mass, sorption time, initial analyte quantities, and agitation speed were analysed and the maximum removal was found at 4, 0.3 g, 120 min, 0.5 mg L, and 150 rpm, respectively. Accordingly, the adsorption capacities of 0.994, 1.113, 0.991 and 1.016 mg g were obtained for DIA, DEA, ATOH and atrazine, respectively. The adsorption characteristics were discussed utilizing Langmuir and Freundlich isotherm models. The fundamental characteristic of the Langmuir isotherm, which can be elaborated using separation factor or equilibrium parameter, R, and coefficient of variation, R, were (0.761, 0.996), (0.884, 0.975), (0.908, 0.983) and (0.799, 0.984) for DIA, DEA, ATOH and Atrazine, respectively. These findings showed that all analytes' adsorption processes were fitted well to the Langmuir adsorption isotherm, indicating that the adsorbent surface was covered in a monolayer. The kinetics was also evaluated using the pseudo-first and pseudo-second order models. The coefficient of determination, r, were found to be 0.09703, 0.9989, 0.9967 and 0.9998 for DIA DEA, ATOH and atrazine, respectively, for pseudo-second order, signifying that, all analytes were found to follow the pseudo-second order rate model showing that the rate limiting step is chemisorption in the sorption process. Based on these findings, the non-edible and disposable part of the oyster mushrooms can be utilized as a preferred alternative biosorbent for the uptake of the target compounds analysed and other pollutants possessing comparable physicochemical characteristics occurring in various water bodies.
在本研究中，平菇的不可食用部分被用于从水样中定量去除最常用的三嗪类除草剂阿特拉津及其降解产物，包括去乙基阿特拉津（DEA）、羟基阿特拉津（ATOH）和去异丙基阿特拉津（DIA）。在吸附前后应用傅里叶变换红外光谱（FTIR）研究了平菇上可用的官能团。分析了影响吸收过程的实验参数，包括酸度、吸附剂质量、吸附时间、初始分析物量和搅拌速度，发现最大去除量分别出现在pH值为4、吸附剂质量为0.3 g、吸附时间为120 min、初始分析物量为0.5 mg/L和搅拌速度为150 rpm时。相应地，DIA、DEA、ATOH和阿特拉津的吸附容量分别为0.994、1.113、0.991和1.016 mg/g。利用朗缪尔和弗伦德利希等温线模型讨论了吸附特性。朗缪尔等温线的基本特征，可以用分离因子或平衡参数R以及变异系数R来阐述，DIA、DEA、ATOH和阿特拉津的（R，R）值分别为（0.761，0.996）、（0.884，0.975）、（0.908，0.983）和（0.799，0.984）。这些结果表明，所有分析物的吸附过程都很好地符合朗缪尔吸附等温线，表明吸附剂表面被单分子层覆盖。还使用伪一级和伪二级动力学模型对动力学进行了评估。对于伪二级动力学模型，DIA、DEA、ATOH和阿特拉津的决定系数r分别为0.09703、0.9989、0.9967和0.9998，这表明所有分析物都遵循伪二级速率模型，表明吸附过程中的限速步骤是化学吸附。基于这些发现，平菇的不可食用和一次性部分可以用作首选的替代生物吸附剂，用于吸收所分析的目标化合物以及各种水体中存在的具有可比物理化学特性的其他污染物。
