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首页> 外文期刊>RSC Advances >Co-precipitation with calcium carbonate - a fast and nontoxic method for removal of nanopollutants from water?
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Co-precipitation with calcium carbonate - a fast and nontoxic method for removal of nanopollutants from water?

机译：用碳酸钙共析 - 一种快速和无毒的方法，用于从水中除去纳米污染物？

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摘要

Presence of nanosized contaminants such as engineered gold (Au), silver (Ag) nanoparticles and graphene oxide (GO) in many commercial products are creating environmental concerns owing to their high toxicity. Removal of such nanomaterials (NMs) from water using current technologies is not very efficient owing to the small size and shapes of such pollutants. Here we explore a fast method for the extraction of NMs from aqueous solutions based on in situ co-precipitation of calcium carbonate particles. Removal efficiency was estimated using batch adsorption studies. The co-precipitation method entraps and removes the nanomaterials in a fast and efficient manner to purify water. Microscopic observation and spectrophotometric analyses indicated the extraction and incorporation of NMs into the calcium carbonate precipitate. Complete removal (99%) of metal nanoparticles and graphene oxide was observed within 10 min during the co-precipitation and settling of the solids. This method is efficient to remove nanopollutants from water at low concentration (ppm) levels. Co-precipitation, a simple and scalable purification method using nontoxic material can be scaled up to treat contaminated industrial effluents.
机译：在许多商业产品中，纳米型污染物如工程金（Au），银（Ag）纳米颗粒和石墨烯（GO），由于其高毒性而产生环境问题。由于这种污染物的小尺寸和形状，使用电流技术从水中除去这种纳米材料（NMS）不是很有效。在这里，我们探讨了基于碳酸钙颗粒的原位共析出的水溶液中萃取NMS的快速方法。使用批量吸附研究估计去除效率。共沉淀法以快速有效的方式捕获并除去纳米材料以净化水。显微镜观察和分光光度分析表明，NMS的提取和掺入碳酸钙沉淀物中。在共沉淀和固体沉降期间，在10分钟内观察到完全除去（99％）金属纳米颗粒和石墨烯氧化物。该方法有效地从低浓度（ppm）水平下从水中除去纳米污染物。共沉淀，使用无毒材料的简单且可伸缩的纯化方法可以缩放以治疗受污染的工业流出物。

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