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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
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Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
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二元化物和As(V) 在水中吸附使用鱼骨灰.

Sergio A Cruz-Briano1, Nahum A Medellin-Castillo2,3, Pablo Delgado-Sanchez4

  • 1Environmental Agenda, Multidisciplinary Graduate Program in Environmental Sciences, University of San Luis Potosi, Av. Dr. M Nava No. 201, Zona Universitaria, 78210, San Luis Potosi, Mexico.

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概括

普莱科鱼骨炭有效地从水中去除化物和,其最佳性能取决于pH值和吸附剂质量. 这项研究强调了鱼骨炭作为可持续的水处理替代品.

关键词:
亚是一种.二进制吸附二进制吸附骨质炭是指骨质炭的部分.化物是一种化物.地下水的地下水.普莱科鱼是一种鱼.

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科学领域:

  • 环境科学 环境科学
  • 材料科学 材料科学 材料科学
  • 水处理技术水处理技术

背景情况:

  • 用化物和污染水源对人类健康构成重大风险.
  • 需要有效和可持续的吸附剂来从饮用水中去除这些同时存在的污染物.
  • 鱼骨炭 (BC) 作为一种潜在的低成本吸附材料正在探索中.

研究的目的:

  • 为了研究化物和As(V) 单独和双重吸附在鱼骨炭 (BC) 上.
  • 为了确定溶液pH和BC质量对吸附能力的影响.
  • 为这些污染物阐明BC的吸附机制和热力学特性.

主要方法:

  • 进行了批量吸附实验,以研究化物和As ((V) 去除.
  • 溶液的pH值,初始污染物度和BC质量各不相同.
  • 分析了吸附能力和去除百分比.
  • 鉴定特征技术 (XRD,EDS) 确定了吸附剂的矿物阶段 (酸).
  • 热力学研究评估了吸附自发性和亲和力.

主要成果:

  • 化物和As(V) 的吸附依赖于pH值.
  • 化物吸附能力随着pH值从9降至5而增加.
  • 由于V) 的吸附能力随着pH值从5增加到9显著增加.
  • 在二进制系统中,BC对化物表现出更高的亲和力,而As(V) 吸附被抑制.
  • 增加BC质量增强了化物和As(V) 移除百分比.
  • 在BC中,Hydroxyapatite被确定为活性吸附阶段,其机制涉及静电吸引,离子交换和共降.

结论:

  • 普莱科鱼骨炭是一种有希望的,可持续的吸收剂,用于从污染水中去除化物和化物.
  • 优化溶液pH和吸附剂剂量对于有效去除污染物至关重要.
  • 这些发现支持使用BC作为净化水的可行替代品.