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Removal of Heavy Metals Using Nanostructured Graphite Oxide, Silica Nanoparticles and Silica/ Graphite Oxide Composite

机译:纳米结构的氧化石墨,二氧化硅纳米颗粒和二氧化硅/氧化石墨复合材料去除重金属

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摘要

Heavy metals are known to be toxic for living organisms even if they are present at low levels. The presence of heavy metals and other pollutants in water continues to be a major concern and the removal of such contaminant is considered to be a major problem in environmental remediation. In the present study, nanostructured graphite oxide, silica/graphite oxide composites and silica nanoparticles were used for the removal of the heavy metal ions from aqueous solutions by a batch adsorption method and have been modelled using classical Langmuir and Freundlich adsorption isotherms. The results revealed that the adsorption of heavy metals by nanostructured graphite oxide was observed in the following order: nickel > zinc > lead > cadmium > chromium. Langmuir adsorption isotherm results showed that graphite oxide is an effective adsorbent for the removal of Nickel ions from aqueous solutions, while Freundlich data obtained for Cadmium, Chromium, Lead, Nickel and Zinc ions suggest monolayer type of adsorption by graphite oxide. Results showed that silica/graphite oxide composite (2:3) is a highly effective adsorbent material for heavy metal ions and highly recommended to be used in water purification technologies.
机译:即使重金属含量低,也已知对生物体有毒。水中重金属和其他污染物的存在仍然是一个主要问题,而去除此类污染物被认为是环境修复中的一个主要问题。在本研究中,纳米结构的氧化石墨,二氧化硅/氧化石墨复合材料和二氧化硅纳米颗粒用于通过分批吸附法从水溶液中去除重金属离子,并已使用经典的Langmuir和Freundlich吸附等温线进行了建模。结果表明,纳米结构的氧化石墨对重金属的吸附顺序为:镍>锌>铅>镉>铬。 Langmuir吸附等温线结果表明,氧化石墨是从水溶液中去除镍离子的有效吸附剂,而有关镉,铬,铅,镍和锌离子的Freundlich数据表明,单层类型的氧化石墨吸附。结果表明,二氧化硅/氧化石墨复合物(2:3)是一种有效的重金属离子吸附材料,强烈建议将其用于净水技术。

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