In order to explore the feasibility of CaO2 used in Modified Fenton (MF) technology for remediation of contaminated groundwater, series static batch test and dynamic simulation column experiments were carried out to characterize the deposition and migration of nano CaO2 in water and aquifer respectively. The effect of pH, Fe2+ concentration and CaO2 dosage on the degradation of 2,4-dichlorophenol (2,4-DCP) using nano CaO2 was also evaluated. The results show that the nano CaO2 particles, coated with polyethylene glycol (PEG), were in the size of 30～50nm. The surface modified nano CaO2 particles were well dispersed in the solution, then a stable colloidal system was formed. Good migration performance was observed for nano CaO2 in aquifer, even in fine sand porous media with a low permeability. 2,4-DCP was effectively removed by the nano CaO2 MF system. The optimal condition for the degradation of 2,4-DCP in this experiment was at pH value as 5, the molar ratio of Fe2+ to 2,4-DCP as 8:1, and the molar ratio of CaO2 to 2,4-DCP as 96:1.These results show that nano CaO2 has a good application prospect in site remediation.%为了探究基于过氧化钙(CaO2)的类芬顿氧化技术(Modified Fenton,MF)修复污染地下水的可行性,本研究利用系列静态批次试验和动态模拟柱试验探讨了制备的纳米CaO2的沉降特性和在含水层中的迁移性,并分析了pH,Fe2+浓度和CaO2投加量对其降解2,4-二氯苯酚(2,4-DCP)的影响.结果表明:制备的纳米CaO2颗粒粒径在30～50nm,外包覆聚乙二醇(PEG)薄膜,在水中以稳定的胶体体系存在,悬浮性能好,不易团聚.纳米CaO2在含水层介质中具有良好的迁移性.特别是渗透性较小的细砂介质对其的阻滞作用也较弱.纳米CaO2的MF体系对2,4-DCP具有良好的降解效果:在试验条件下,当pH为5,Fe2+与2,4-DCP物质的量比为8:1,纳米CaO2与2,4-DCP物质的量比为96:1时降解效果最好.这说明纳米CaO2在场地修复中具有较好的应用前景.
wenku.so.com摘要冻害和热害等温度逆境是影响我国柑橘生产的主要环境限制因子。研究温度逆境之下的生理生化反应,进而寻找出提高柑橘抗逆性的方法和途径,对于发展柑橘产业具有重大的理论和实际意义。本论文主要探讨了ca2调节柑橘对温度逆境的作用,旨在寻找出有效的提高柑橘抵御温度逆境
ai.so.com实验名称:CaO2的制取实验报告实验目的:利用化学反应制取CaO2,并测试其效果。实验原理:CaO2,又称过氧化钙,其化学式为CaO2。是一种白色粉末,常温下稳定无毒。CaO2可以和水反应来释放出氧气,这种反应是在生物领
wenda.so.com过氧化钙 CAO2的化学名称是过氧化钙。 过氧化钙(CaO2)是一种无机化合物,通常为白色或淡黄色结晶性粉末,无臭,几乎无味,难溶于水,不溶于乙醇、乙醚等有机溶剂。 过氧化钙 CAO...
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