当前位置: X-MOL 学术Biomass Convers. Biorefin. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Simple effective new bio-adsorbents for the removal of highly toxic nitrite ions from wastewater
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2021-07-08 , DOI: 10.1007/s13399-021-01677-6
Doddi Kishore Babu 1 , Kunta Ravindhranath 1 , Suneetha Mekala 2
Affiliation  

Bio-adsorbents derived from Sesbania grandiflora (SGSP/SGSAC) and Amorphophallus paeoniifolius (APSP/APSAC) plants are investigated for their ability to remove nitrite from polluted water. Different extraction conditions have been investigated and optimized for the maximum nitrite removal. Adsorption capacities are found to be 44.5 mg/g for SGSP, 57.5 mg/g for SGSAC, 40.0 mg/g for APSP and 65.5 mg/g for APSAC. Thermodynamic parameters are evaluated. High values of ΔH° for SGSAC (50.872 kJ/mole) and APSAC (67.907 kJ/mole) indicate ion exchange mode of sorption. Spontaneous and endothermic nature of sorption is indicated by negative ΔG values. Positive values of ΔS emphasizes the disorder at solid/liquid interface. The adsorption follows Langmuir isotherm for all the four sorbents, indicating formation of monolayer of nitrite ‘onto’ the surface of sorbents and uniform distribution active sites. Pseudo second-order kinetics explains well the kinetics of adsorption and this reflects that the adsorption is through exchange of electrons or sharing of electrons between nitrite and functional groups sorbents. The developed sorbents are applied effectively for nitrite removal from polluted lake real water samples. The merit of the present investigation is that simple, effective and easily available plant-based bio-materials are identified for the removal of toxic nitrites from water.

Graphical abstract



中文翻译:

用于去除废水中剧毒亚硝酸根离子的简单有效的新型生物吸附剂

源自田菁(SGSP/SGSAC) 和Amorphophallus paeoniifolius 的生物吸附剂(APSP/APSAC) 植物从受污染的水中去除亚硝酸盐的能力被研究。为最大程度地去除亚硝酸盐,已对不同的提取条件进行了研究和优化。发现吸附容量对于 SGSP 为 44.5 mg/g,对于 SGSAC 为 57.5 mg/g,对于 APSP 为 40.0 mg/g 和对于 APSAC 为 65.5 mg/g。评估热力学参数。SGSAC (50.872 kJ/mole) 和 APSAC (67.907 kJ/mole) 的高 ΔH° 值表明吸附是离子交换模式。吸附的自发和吸热性质由负 ΔG 值表示。ΔS 的正值强调了固/液界面的无序。所有四种吸附剂的吸附遵循朗缪尔等温线,表明在吸附剂表面形成单层亚硝酸盐,活性位点分布均匀。伪二级动力学很好地解释了吸附动力学,这反映了吸附是通过亚硝酸盐和官能团吸附剂之间的电子交换或电子共享。开发的吸附剂可有效去除受污染湖泊实际水样中的亚硝酸盐。本研究的优点是确定了简单、有效和容易获得的植物基生物材料,用于去除水中的有毒亚硝酸盐。

图形概要

更新日期:2021-07-08
down
wechat
bug