共查询到20条相似文献,搜索用时 31 毫秒
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本文基于挥发性有机物的内涵,分析了其危害,并进一步提出了收集挥发性有机物的方法和检测、分析方法以及检测方法中应当注意的问题,进而为相关检测技术的发展奠定可参考依据. 相似文献
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有机污染物对水资源的污染极其严重,改变水体的使用性质,造成危害。对于水资源的检测注重有机污染物浓度的常规检测,通过数据分析掌控水中有机污染物中的含量及种类,才能对症处理和治理水资源环境,保障水源的正常使用。本文着重分析水检测工作中有机污染物的检测技术及相关应用,希望有助于相关职能部门的工作有所帮助。 相似文献
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Titanium dioxide (TiO2) powder was mixed with varying concrete sealer formulations and applied to prepared concrete surfaces within PVC batch reactors. A solution of 4-chlorophenol in de-ionized water, with an initial 4-chlorophenol concentration of 4 mg/L, was added to each open reactor. The photocatalytic efficiency of each TiO2-sealer was determined through bulk solution sampling while a reactor was exposed to continuous UV light. Through analysis of mean 4-chlorophenol concentrations, the disappearance of 4-chlorophenol from solution was attributed solely to the presence of TiO2 in the sealed concrete surface of a UV exposed reactor. The rate of disappearance increased when the mass percent of TiO2 in the sealer was increased. The zero-order reaction rate constants ranged from 0.135 to 0.2873 mg L−1 h−1. 相似文献
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生物质与煤混合燃烧成灰特性研究进展 总被引:3,自引:0,他引:3
基于能源与环境的双重压力以及生物质与煤单独燃用存在的问题,生物质与煤混燃已成为一种发展趋势.生物质与煤混燃存在的结渣积灰等问题制约着混燃技术的推广利用,因此研究生物质与煤混合燃烧的成灰特性具有现实意义.文章详细介绍了生物质与煤混合燃烧成灰特性的影响因素和分析方法,认为温度是影响生物质与煤混合燃烧成灰特性的主要因素;生物质与煤的混合比例对灰渣成分有一定影响,但二者间不存在明显的线性关系.燃料中的碱金属、氯、硫是引起结渣积灰的主要物质.由于生物质与煤的成灰特性相近,只是灰渣成分的含量差异较大,因此可以利用已有的煤结渣特性研究成果,分析混燃的成灰特性,但须要考虑生物质灰分的特征. 相似文献
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《International Journal of Hydrogen Energy》2019,44(5):2711-2730
The magnetically separable Ag/Fe3O4/RGO nanocomposites (NCs) were synthesized through a green method using Punica Granatum peel extract as a reducing and stabilizing agent. The total phenolic content (TPC) in the Punica Granatum peel extract and the ability of extract to scavenge the DPPH radical were measured and the results proved that the extract has the ability of reduction of Ag+ ions and graphene oxide (GO) to Ag nanoparticles (NPs) and reduced graphene oxide (RGO), respectively. Furthermore, the presence of phenolic compounds in the extract was confirmed using UV–Vis and FT-IR techniques. Deposition of Ag NPs on the surface of Fe3O4/RGO NCs was confirmed by color change from transparent to brown with maximum absorption at 418 nm which is due to surface plasmon resonance of Ag NPs. The crystalline nature of the Ag/Fe3O4/RGO NCs was identified utilizing XRD analysis. The catalytic activity of the green synthesized Ag/Fe3O4/RGO NCs was evaluated in the reduction of organic pollutants such as 4-nitrophenol (4-NP), methylene blue (MB), methyl green (MG) and methyl orange (MO) in water at mild conditions. The results indicated that the biosynthesized NCs have very high and effective catalytic activity for the different types of dyes within few seconds. The morphology and catalytic activity of the Ag/Fe3O4/RGO NCs was compared with Ag/RGO and Ag/Fe3O4 NCs, which were synthesized using Punica Granatum peel extract. The results revealed that the unique synergistic effect of Ag NPs and immobilization over supporters of RGO and Fe3O4 magnetite composite assisted in the reduction of 4-NP, MB, MG and MO. 相似文献
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随着垃圾焚烧技术的不断发展,由此产生的二次污染问题也日益显现出来,主要包括垃圾焚烧所产生的飞灰污染、烟气中二恶英以及重金属的污染,特别是二恶英污染已引起全世界的关注,这对垃圾焚烧工艺的进一步发展提出了新的挑战。污染给人类的生存环境造成了很大的破坏,严重威胁着人类的安全。因而,二次污染物的排放控制问题成为亟待解决的问题。本文就垃圾焚烧所产生的二次污染物的排放处理进行讨论。 相似文献
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青山烟煤及其燃后飞灰中有机污染物分布的研究 总被引:6,自引:0,他引:6
采用色谱/质谱联用系统对青山烟煤及其燃烧产物-飞灰7H,16H和24H二氯甲烷索氏抽提液中脂肪烃、苯系物及多环芳烃等有机污染物的种类和含量进行了测量,得到了青山烟煤及其飞灰产物中有机污染物的分布特征。 相似文献