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Evaluation of Single and Multi-component Adsorption of Metronıdazole, Phosphate and Nitrate on Activated Carbon from Prosopıs Julıflora
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2018-04-05
S.V. Manjunath, Mathava Kumar

In this investigation, activated carbon was prepared from Prosopis juliflora (PJAC) and characterized using porosimetry, scanning electron microscope (SEM-EDX), Elemental analysis (CHNS), Fourier Transmission-Infrared Radiation (FTIR) and X-ray Diffraction (XRD) analysis. Subsequently, PJAC was used in single (metronidazole (MNZ), phosphate (PO43-) and nitrate (NO3-)) and multi-component adsorption system (MNZ:P:N). As a first step, single-component batch adsorption experiments, i.e. kinetic and equilibrium studies, were conducted at controlled conditions (30°C) and outcomes were used to find out the rate constant and maximum adsorption capacity (qmqm). The pseudo-second-order kinetic model was found to well represent the removals of MNZ, PO43- and NO3- on PJAC. Among the five isotherm models used, Langmuir isotherm model has predicted qmqm of PJAC for MNZ (17.33 mg/g), PO43- (13.55 mg/g) and NO3- (10.99 mg/g) with good correlation. In addition, the thermodynamic parameters have shown that the adsorption of MNZ, PO43- and NO3- was non-spontaneous, endothermic and increased randomness in nature. In order to quantify the competitive adsorption of a multi-component system, i.e. MNZ, PO43- and NO3-, the batch experiments were conducted in the presence of all three compounds at a ratio of 1:2.5:5 at three different MNZ:P:N concentrations levels (0.1:0.25:0.5, 1:2.5:5 and 10:25:50 mg/L). The modified Langmuir competitive adsorption isotherm model was used to predict the effect of competitive adsorption. In a multi-component system, the maximum adsorption capacities of MNZ and NO3- were decreased by ∼34 and ∼2 times, respectively than single compound system; however, it was increased by ∼1.12 times for PO43-. Overall, the results indicate that PJAC could be used as a potential adsorbent for the removal of emerging pollutants and nutrients.



中文翻译:

甲壳素活性炭对甲硝唑,磷酸盐和硝酸盐的单组分和多组分吸附性能评价

在这项研究中,活性炭是由朱s Prosopis juliflora(PJAC)制备的,并使用孔隙率法,扫描电子显微镜(SEM-EDX),元素分析(CHNS),傅立叶透射红外辐射(FTIR)和X射线衍射(XRD)进行了表征。分析。随后,在PJAC单个使用(甲硝唑(MNZ),磷酸盐(PO 4 3-)和硝酸盐(NO 3 - ))和多组分吸附系统(MNZ:P:N)。第一步,在受控条件下(30°C)进行单组分间歇吸附实验,即动力学和平衡研究,并使用结果找出速率常数和最大吸附容量(q mq)。伪二级动力学模型发现很好地代表MNZ,PO的清除4 3-和NO 3 -上PJAC。在使用的五个等温线模型中,Langmuir等温线模型预测了q mq的PJAC对MNZ(17.33毫克/克),PO 4 3-(13.55毫克/克)和NO 3 -以良好的相关性(10.99毫克/克)。此外,热力学参数表明MNZ的吸附,PO 4 3-和NO 3 -是非自发的,吸热和在自然界中增加随机性。为了量化的多组分体系的竞争吸附,即MNZ,PO 4 3-和NO 3 -,在三种不同的MNZ:P:N浓度水平(0.1:0.25:0.5、1:2.5:5和10:25:50)下,所有三种化合物均以1:2.5:5的比例进行分批实验毫克/升)。修改后的Langmuir竞争吸附等温线模型用于预测竞争吸附的效果。在多组分体系中,MNZ和NO的最大吸附容量3 -被〜34个〜2倍,分别比单一化合物系统降低; 然而,对于PO 4 3-,它增加了约1.12倍。总体而言,结果表明,PJAC可用作潜在的吸附剂,用于去除新兴的污染物和养分。

更新日期:2018-04-06
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