利用 Moringa oleifera 根粉(MORP)对重金属污染水进行可持续修复。

IF 3.4 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Blessing Chidiebere Mbaeze, Nwachukwu Romanus Ekere, Chioma Sarah Chukwu, Oga Kingsley Ominyi, Janefrances Ngozi Ihedioha
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引用次数: 0

摘要

随着工业化和城市化进程的加快,重金属环境污染正在迅速加剧。涂料生产、采矿和原材料生产等工业过程会排放出富含重金属(如 Pb2+、Cd2+、Cu2+ 和 Cr3+)的废水。这些重金属具有危险性,因为它们在自然界中持久存在,不可生物降解,而且极易在环境和接触它们的生物体内积累。本研究以油辣木根粉末(MORP)为吸附剂,研究如何从水溶液中去除重金属(铜、铅、铬和镉)。通过扫描电镜、傅立叶变换红外光谱、BET 和 XRD 对 MORP 进行了表征。批量吸附实验研究了吸附剂浓度、吸附剂用量、搅拌时间、pH 值和温度对吸附的影响。最佳参数为:接触时间(90 分钟);pH 值(9);吸附剂剂量(0.6);金属离子浓度(30 毫克/升-1)(铬)和 40 毫克/升-1(其他金属离子);温度(50 °C)(铜和铅)和 70 °C(铬和镉)。用 5 种等温线模型(Temkin、Flory-Huggins、Langmuir、D-R 和 Freundlich)分析了这些实验数据。与其他模型相比,Temkin 等温线的拟合效果最好。动力学研究表明,与伪一阶动力学模型和颗粒内扩散动力学模型相比,伪二阶动力学模型对吸附的描述最好(R2 值很高,在 0.9810-0.9976 之间)。热力学研究结果表明,铜和铅的吸附过程是内热的,而镉和铬的吸附过程是放热的。该吸附剂对所研究的离子具有良好的吸附倾向,可用于工业规模的金属污染水修复。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Harnessing Moringa oleifera root powder (MORP) for the sustainable remediation of heavy metal contaminated water.

Heavy metal environmental pollution is rapidly increasing due to the increase in industrialization and urbanization. Industrial processes, such as paint production, mining, and raw materials producing industries release effluents rich in heavy metals, like Pb2+, Cd2+, Cu2+, and Cr3+. These heavy metals are dangerous because they persist in nature, are non-biodegradable and they have high tendency to accumulate in the environment and in living organisms who are exposed to them. This work studied the removal of heavy metals (Cu, Pb, Cr, and Cd) from aqueous solution using Moringa oleifera root powder (MORP) as the adsorbent. The MORP was characterized by SEM, FTIR, BET, and XRD. Batch adsorption experiments carried out investigated the effects of adsorbate concentration, adsorbent dosage, agitation time, pH and temperature on adsorption. The optimum parameters are: contact time (90 min); pH (9); adsorbent dose (0.6); metal ion concentration (30 mg L-1) for Cr and 40 mg L-1 for the rest; and temperature (50 °C) for Cu and Pb, and 70 °C for Cr and Cd. These experimental data were analyzed with 5 isotherm models (Temkin, Flory-Huggins, Langmuir, D-R and Freundlich). The result obtained fitted best to Temkin isotherm in comparison to others. Kinetic studies revealed that the pseudo-second order kinetic model best described the adsorption (with high R2 values ranging from 0.9810-0.9976) compared to pseudo-first order and intra-particle diffusion kinetics model. Results of the thermodynamic study showed that the sorption process was endothermic for Cu and Pb, but exothermic for Cd and Cr. The adsorbent showed good adsorptive tendencies toward the ions studied, and could be applied on an industrial scale for the remediation of metal contaminated water.

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来源期刊
International Journal of Phytoremediation
International Journal of Phytoremediation 环境科学-环境科学
CiteScore
7.60
自引率
5.40%
发文量
145
审稿时长
3.4 months
期刊介绍: The International Journal of Phytoremediation (IJP) is the first journal devoted to the publication of laboratory and field research describing the use of plant systems to solve environmental problems by enabling the remediation of soil, water, and air quality and by restoring ecosystem services in managed landscapes. Traditional phytoremediation has largely focused on soil and groundwater clean-up of hazardous contaminants. Phytotechnology expands this umbrella to include many of the natural resource management challenges we face in cities, on farms, and other landscapes more integrated with daily public activities. Wetlands that treat wastewater, rain gardens that treat stormwater, poplar tree plantings that contain pollutants, urban tree canopies that treat air pollution, and specialized plants that treat decommissioned mine sites are just a few examples of phytotechnologies.
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