利用纳米生物炭和稻壳的吸附等温线和从水介质中去除铅 (II) 和镉 (II)

IF 3.4 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Muhammad Tayyab, Sumera Anwar, Fahad Shafiq, Umer Shafique, Cengiz Kaya, Muhammad Ashraf
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引用次数: 0

摘要

从水溶液中去除镉(II)和铅(II)是一项具有挑战性的任务,目前正在寻找新型吸附剂。本研究考察了纳米生物炭(NB)和稻壳(RH)吸附和去除水中镉(II)和铅(II)的效率。测试了各种理化参数的影响,如初始 pH 值、初始镉和铅浓度、吸附剂用量和接触时间。SEM/EDX 图像证实了铅和镉的吸附与表面物理和化学变化有关。NB 在 pH 值为 6 时对铅的去除率最高(96%),RH 在 pH 值为 8 时对铅的去除率最高(90%);NB 在 pH 值为 8 时对镉的去除率最高(91%),RH 在 pH 值为 6 时对镉的去除率最高(87%)。在较低的 pH 值下,吸附强度下降,这表明吸附剂表面的质子化导致了阳离子与阳离子之间的排斥。大部分吸附发生在最初的 60 分钟内。随着时间的推移,吸附量持续逐渐增加,这表明多层的形成。在三种等温线中,Freundlich 模型最符合当前数据,这意味着表面覆盖范围是无限的,表明在 RH 和 NB 吸附剂表面有可能形成铅和镉的多层吸附。总之,本研究强调了 NB 作为一种具有成本效益的吸附剂在去除水溶液中的镉和铅离子方面的巨大潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adsorption isotherms and removal of lead (II) and cadmium (II) from aqueous media using nanobiochar and rice husk.

Removal of Cd(II) and Pb(II) from aqueous solutions is a challenging task and the search for novel adsorbents is underway. This study examined the efficiency of nanobiochar (NB) and rice husk (RH) in the adsorption and removal of Cd(II) and Pb(II) from water. The effect of various physicochemical parameters such as initial pH, initial Cd and Pb concentration, adsorbent dosage, and contact time were tested. SEM/EDX images confirmed the adsorption of Pb and Cd with surface physical and chemical changes. The maximum Pb removal was noted at pH 6 using NB (96%) and at pH 8 for RH (90%), and the maximum Cd removal by NB was recorded at 8 pH (91%) and by RH at pH 6 (87%). The decline in adsorption intensity at lower pH suggested protonation of the adsorbent surface causing cation-cation repulsion. Most of the adsorption occurred within the initial 60 min. A continuous gradual increase in the adsorption with time suggested multilayer formation. Of the three isotherms, the Freundlich model fits the present data best, implying an infinite surface coverage and indicating the potential for multilayer adsorption of Pb and Cd on the surfaces of RH and NB adsorbents. In conclusion, this study highlights the promising potential of NB as a cost-effective adsorbent for the removal of Cd and Pb ions from aqueous solutions.

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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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