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61.
Removal of citrate and hypophosphite binary components using Fenton,
photo-Fenton and electro-Fenton processes 总被引:1,自引:0,他引:1
Both citrate and hypophosphite in aqueous solution were degraded by advanced oxidation processes (Fe2+/H2O2, UV/Fe2+/H2O2, and electrolysis/ Fe2+/H2O2) in this study. Comparison of these techniques in oxidation efficiency was undertaken. It was found that Fenton process could not degrade completely citrate in the presence of hypophosphite since it caused a series inhibition. Therefore, UV light (photo-Fenton) or electron current (electro-Fenton) was applied to improve the degradation efficiency of the Fenton process. Results showed that both photo-Fenton and electro-Fenton processes could overcome the inhibition of hypophosphite, especially the electro-Fenton. 相似文献
62.
消费者产品中大量使用的内分泌干扰素的潜在健康影响暴露评估和源识别被高度重视.研究者搜集了加州Richmond工业区40户非吸烟家庭和加州Bolinas 10户乡村家庭室内和室外空气平行样本.利用GC-MS分析104种因子,包括邻苯二甲酸盐、烷基[苯]酚、对羟苯甲酸酯、多溴联苯醚(PBDE)阻燃剂、多氯联苯(PCBs)、多环芳烃 相似文献
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紫外光照射下铁锰物种对酸性橙Ⅱ的脱色研究 总被引:1,自引:0,他引:1
以高铁酸钠原液对酸性橙Ⅱ进行氧化脱色,并对比了高锰酸钾在紫外光照射下的脱色能力.结果表明,254 nm紫外光照射提高了高铁酸钠原液与高锰酸钾的脱色效能,而且紫外光和高铁酸钠原液联合使用时,对染料的脱色速率是单独紫外光和单独高铁酸钠原液脱色速率的1.11倍,产生了一定的协同作用.通过对比紫外光照射下硝酸铁和硫酸锰的脱色能力,证明低价态的水合Fe(Ⅲ)物种具有较强的光反应性,异丙醇淬灭试验证明产生了大量羟基自由基.另外,在所考察的pH范围内,无论紫外光照射与否,相对于硫酸锰和高锰酸钾,硝酸铁和高铁酸钠原液都保持了较高而稳定的脱色能力. 相似文献
66.
Removal of a type of endocrine disruptors-di-n-butyl phthalate from water by ozonation 总被引:1,自引:0,他引:1
Ozonation of synthetic water containing a type of endocrine disruptor-di-n-butyl phthalate (DBP) was examined. Key impact factors such as pH, temperature, ionic strength, ozone dosage and initial DBP concentration were investigated. In addition, the activities of radicals on uncatalysed and catalysed ozonation were studied. The degradation intermediate products were followed and the kinetic of the ozonation were assessed as well. Results revealed that ozonation of DBP followed two mechanisms. Firstly, the reaction rate of direct ozonation was slower at lower pH, temperature, and ionic strength. Secondly, when these factors were increased for indirect radical reaction, higher percentage of DBP was removed with the increase of the initial ozone dosage and the decrease of the initial DBP concentration. In addition, tea-butanol, humic substances and Fe(Ⅱ) affected DBP ozonation through the radical pathway. It was determined that ozonation was restrained by adding tea-butanol for its radical inhibition effect. Furthermore, humic substances enhanced the reaction to some extent, but a slight negative effect would be encountered if the optimum dosage was exceeded. As a matter of fact, Mn(Ⅱ) affected the ozonation by "active sites" mechanism. In the experiment, three different kinds of intermediate products were produced during ozonation, but the amount of products for each one of them decreased as pH, temperature, ionic strength and initial ozone dosage increased. A kinetic equation of the reaction between ozone and DBP was obtained. 相似文献
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聚苯乙烯磺酰肼基二硫代甲酸盐树脂的制备及其除卤效果初探 总被引:1,自引:1,他引:0
由卤代次甲基化合物标样分别民对甲苯代磺酸钾、对甲苯亚磺酸钠及对甲苯磺酰在二硫代甲酸进行反应,发现化合物3与标样反应最快,因此,通过三步反频将该基因接枝到聚苯乙烯白球上, 相似文献
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