Labratory of Chemistry, University of Applied and Science Technology, Lalejin 36020, Iran.
J Hazard Mater. 2011 Sep 15;192(3):1437-40. doi: 10.1016/j.jhazmat.2011.06.060. Epub 2011 Jul 14.
Chemical oxidation is one of the many different methods of site remediation that has emerged lately as an alternative method to traditional techniques. According to this research calcium peroxide is suitable choice for contaminant biodegradation in soil and ground water but speed of oxidation reaction between calcium peroxide and contaminant is slow. Synthesis of calcium peroxide in nano size by increased ratio of surface to volume can increase the speed of reaction and solve the problem. We have developed a simple surface modification technique to avoid irreversible agglomeration of calcium peroxide nanoparticles. The technique is based on hydrolysis-precipitation procedure, using CaCl(2) as a precursor. Polyethylene glycol 200 (PEG200) is used as a surface modifier. CaO(2) was identified and studied by characterization techniques, including XRD and TEM. The results indicate the ability of this method for synthesis of new reagent in nano size and improve quality of in situ chemical oxidation. Size determination by TEM image indicates the size of calcium peroxide nanoparticles approximately 15-25 nm.
化学氧化是最近出现的一种场地修复方法，它是传统技术的替代方法。根据这项研究，过氧化氢钙是土壤和地下水污染物生物降解的合适选择，但过氧化氢钙与污染物之间的氧化反应速度较慢。通过增加表面积与体积的比例，将过氧化氢钙合成纳米级可以提高反应速度并解决这个问题。我们开发了一种简单的表面改性技术来避免过氧化氢钙纳米颗粒的不可逆团聚。该技术基于水解沉淀程序，使用氯化钙(CaCl(2))作为前体。聚乙二醇 200(PEG200)用作表面改性剂。通过 XRD 和 TEM 等特性分析技术鉴定并研究了 CaO(2)。结果表明，该方法能够以纳米级合成新试剂，并改善原位化学氧化的质量。通过 TEM 图像进行的尺寸测定表明，过氧化氢钙纳米颗粒的尺寸约为 15-25nm。
