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针对传统棉织物冷轧堆漂白法耗时长和耗碱高等问题,研究H2O2/NOBS活化体系在纯棉织物冷轧堆漂白中的应用.通过单因素试验和正交试验法分析各工艺因素对漂白效果的影响,探讨其作用原理,开发了整套的应用工艺技术.合适的工艺条件为:H2O2质量浓度30 g/L,NOBS与H2O2物质的量比1:4,NaOH质量浓度6 g/L,堆置时间6 h.结果表明:该活化漂白工艺在改善漂白织物品质的前提下能够大大减少耗碱量,缩短冷轧堆时间,具有生态环保和高效节能的优势. 相似文献
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针对腈纶基牛奶蛋白纤维在高温碱性条件下易泛黄的问题,在双氧水漂白中,加入由壬酰基苯磺酸钠(NOBS)、四乙酰乙二胺(TAED)及葡萄糖酸盐复合而成的双氧水低温活化促进剂HK,利用双氧水和活化剂体系的联合作用,对腈纶基牛奶蛋白纤维针织物进行漂白。通过正交试验,确定的漂白工艺为:H2O2/活化剂HK用量15/15 g/L,碱剂用量0.5 g/L,漂白温度70℃,时间70~80 min,浴比1∶30。与常规的双氧水漂白、保险粉还原漂白对比,发现采用双氧水/复合低温活化促进剂漂白是一种可行而有效的漂白方法。 相似文献
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竹浆纤维H2O2/TAED活化低温漂白体系 总被引:1,自引:0,他引:1
竹浆纤维双氧水漂白采用四乙酰乙二胺(TAED)作为活化剂,探讨了H2O2/TAED摩尔比、双氧水浓度、时间、温度及pH值对漂白效果的影响,并通过检测羧基含量、失重率、可染性,以及广角X-射线衍射和红外光谱分析,比较了H2O2/TAED漂白和常规双氧水漂白对竹浆纤维性能和结构的影响.研究表明,在温度60~80℃和弱碱性条件下,采用H2O2/TAED活化体系(两者摩尔比为2:1)对竹浆纤维进行漂白,具有白度高、黄度低、降低漂白温度,以及对纤维结晶结构和可染性无影响等优点,可解决竹浆纤维白度不高的问题. 相似文献
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分光光度-低压离子色谱法测定Cu2+、Ni2+、Zn2+、Pb2+、Fe2+和Mn2+ 总被引:1,自引:1,他引:0
建立了分光光度-低压离子色谱法测定Cu2+、Ni2+、Zn2+、Pb2+、Fe2+和Mn2+6种重金属离子的分析方法.选用柠檬酸-草酸混合液作为洗脱体系进行梯度洗脱,将6种金属离子完全分离,柱后采用1-(2-吡啶偶氮)-2-萘酚(PAN)进行衍生反应,于波长560 nm处进行检测.6种离子的检出限分别为0.006、0.012、0.005、0.125、0.070、0.020 mg/L.该方法用于环境水样测定,结果与原子吸收法所测值基本吻合,分析结果令人满意. 相似文献
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添加助剂的过氧化氢漂白 总被引:2,自引:0,他引:2
麦草NaOHO2/NaOH两段蒸煮纸浆具有良好的可漂性,采用简单的酸处理H2O2漂白(AP)程序,仅用15%的H2O2可使漂白浆的白度达到74%~753%(ISO)。为了进一步提高麦草NaOHO2/NaOH两段蒸煮纸浆无氯漂白的效果,又进行了添加助剂的H2O2漂白试验。1试验部分漂白用浆为麦草NaOH预处理O2/NaOH蒸煮的氧碱浆,其白度为594%(ISO),卡伯值109,粘度827ml/g。漂白采用酸处理H2O2漂白(AP)程序,浆样先用H2SO4进行预处理,再进行H2O2漂白。酸处理在烧杯中进行,H2… 相似文献
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Cerrato JM Barrows CJ Blue LY Lezama-Pacheco JS Bargar JR Giammar DE 《Environmental science & technology》2012,46(5):2731-2737
The dissolution of UO(2) in a continuously stirred tank reactor (CSTR) in the presence of Ca(2+) and Zn(2+) was investigated under experimental conditions relevant to contaminated groundwater systems. Complementary experiments were performed to investigate the effect of adsorption and precipitation reactions on UO(2) dissolution. The experiments were performed under anoxic and oxic conditions. Zn(2+) had a much greater inhibitory effect on UO(2) dissolution than did Ca(2+). This inhibition was most substantial under oxic conditions, where the experimental rate of UO(2) dissolution was 7 times lower in the presence of Ca(2+) and 1450 times lower in the presence of Zn(2+) than in water free of divalent cations. EXAFS and solution chemistry analyses of UO(2) solids recovered from a Ca experiment suggest that a Ca-U(VI) phase precipitated. The Zn carbonate hydrozincite [Zn(5)(CO(3))(2)(OH)(6)] or a structurally similar phase precipitated on the UO(2) solids recovered from experiments performed in the presence of Zn. These precipitated Ca and Zn phases can coat the UO(2) surface, inhibiting the oxidative dissolution of UO(2). Interactions with divalent groundwater cations have implications for the longevity of UO(2) and the mobilization of U(VI) from these solids in remediated subsurface environments, waste disposal sites, and natural uranium ores. 相似文献
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氯化钙用于高得率浆H2O2漂前预处理 总被引:2,自引:1,他引:2
研究了CaCl2用于高得率桦木浆H2O2漂前预处理的效果,并与DTPA、EDTA、H2SO4等预处理剂的预处理效果进行了比较。结果表明,CaCl,是一种优良的预处理剂。CaCl2预处理的适宜条件为:用量0.5%,pH值7,温度40℃,时间25min。 相似文献
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Yu-Jing Zhu Han-Tao Zhou Yong-Hua Hu Jian-Yang Tang Ming-Xing Su Yun-Ji Guo Qing-Xi Chen Bo Liu 《Food chemistry》2011
The inhibition kinetics of 2-phenylethanol, 2-phenylacetaldehyde and 2-phenylacetic acid on the enzyme activity of mushroom tyrosinase have been investigated. The results showed that these aromatic compounds can lead to reversible inhibition of the enzyme; furthermore, 2-phenylacetaldehyde and 2-phenylacetic acid are uncompetitive inhibitors and 2-phenylethanol is a mixed-type inhibitor. The inhibition constants have been determined and the inhibiting ability was: 2-phenylacetaldehyde > 2-phenylacetic acid > 2-phenylethanol, indicating that the functional group on the benzene ring group played an important role in the inhibition of the enzyme. In addition, 2-phenylacetic acid and 2-phenylethanol were found to have effective antibacterial activities, and 2-phenylacetic acid was more effective against Escherichia coli and Ralstonia solanacearum than 2-phenylethanol, but 2-phenylacetaldehyde lacked of antibacterial activity. 相似文献