共查询到20条相似文献,搜索用时 796 毫秒
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在pH值=4.0的条件下,Hg2 ,I-与罗丹明6G(R6G)形成三元离子缔合物.由于HgI4(R6G)2分子间存在较强的分子间作用力和疏水作用力而生成[HgI4-(R6G)2]n纳米微粒.在320 nm处产生一灵敏共振散射(即共振瑞利散射)光谱峰.Hg质量浓度在0.004~0.36 mg·L-1范围内与共振散射光强度呈现出良好线性关系.实验结果表明,本法具有灵敏度较高、选择性较好等特点.用于水样中微量Hg的测定,效果良好. 相似文献
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本文主要对垃圾焚烧发电厂渗滤液处理中,后加碳源A/O复合MBR工艺的实际应用情况进行了介绍与分析.在实际操作中,由于复合MBR工艺对生活垃圾焚烧发电厂渗滤液中的有机污染物与氨氮有着较高的去除率,因此,经过这一组合工艺进行处理后,垃圾焚烧发电厂的出水COD能够有效的降低到200毫克每升以下,而出水氨氮也能够很好的控制在8毫克每升以下.相对于普通的MBR工艺来说,这种两级A/O复合MBR工艺对有机污染物与氨氮有着更高的去除率,对垃圾焚烧发电厂渗滤液的处理作用更为明显. 相似文献
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Sheriff Adewuyi Nurudeen O. Sanyaolu Saliu A. Amolegbe Abdulahi O. Sobol Olujinmi M. Folarin 《环境科学学报(英文版)》2012,24(9):1702-1708
Chemical reduction of nitrate using metal nanoparticles has received increasing interest due to over-dependence on groundwater and consequence health hazard of the nitrate ion. One major drawback of this technique is the agglomeration of nanoparticles leading to the formation of large flocs. A low cost biopolymeric material, poly [β-(1 → 4)-2-amino-2-deoxy-D-glucopyranose] (β-PADG) obtained from deacetylated chitin was used as stabilizer to synthesize zero valent nickel (ZVNi) nanoparticles. The β-PADG-ZVNi nanocomposite was characterized using infra red (IR), UV-Vis spectrophotometric techniques and Scanning Electron Microscope (SEM). The morphology of the composite showed that β-PADG stabilized-ZVNi nanoparticles were present as discrete particles. The mean particle size was estimated to be (7.76 ± 2.98) nm and surface area of 87.10 m2/g. The stabilized-ZVNi nanoparticles exhibited markedly greater reactivity for reduction of nitrate in water with 100% conversion within 2 hr contact owing to less agglomeration. Varying the β-PADG-to-ZVNi ratio and the ZVNi-to-nitrate molar ratio generally led to a faster nitrate reduction. About 3.4-fold difference in the specific reaction rate constant suggests that the application of the β-PADG-stabilizer not only increased the specific surface area of the resultant nanoparticles, but also greatly enhanced the surface reactivity of the nanoparticles per unit area. 相似文献
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通过偶氮化反应将合成的去叔丁基杯[4]芳烃连接到Amberlite XAD-4树脂上,并且采用FTIR、SEM和TG/DTA法表征了杯[4]芳烃修饰Amberlite XAD-4树脂的结构.结果表明,水溶液中杯[4]芳烃修饰Amberlite XAD-4树脂对双氯芬酸的去除率远大于单独Amberlite XAD-4树脂和杯[4]芳烃.双氯芬酸的浓度为20mg/L时,随着杯[4]芳烃修饰AmberliteXAD-4树脂投加量的增加,双氯芬酸的去除率增加很快.当吸附剂量增加到80mg/L时,双氯芬酸的去除率为92.8%,并且达到吸附平衡,吸附的双氯芬酸量为34.02mg/g. Langmuir和Freundlich等温线与实验数据均有很好的拟合度.对热力学参数的计算表明,△H与△G负值显示出反应的放热和自发过程. 相似文献
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[Cu—γ—Al2O3]催化剂处理染料废水工艺条件研究 总被引:3,自引:0,他引:3
采用「Cu-γ-Al2O3」催化剂对由活性艳红X-3B配制的CODcr为5700mg/L色度3100倍的实际染料废水进行了催化氧化试验,试验表明,在控制pH=4-5,H2O2用量为5.0mg/L,催化剂用量为3.0g/L,t=70℃和反应时间为2h条件下,可获得CODcr去除率为77%-78%,脱色率为99%的良好效果,且催化剂可再生使用。 相似文献
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根据配位化学热力学平衡原理,绘制了温度为298.15K时Zn2+-S2--H2O系pC-pH热力学平衡状态图。结果表明:ZnS溶解平衡时,随着pH值的增加,ZnS的溶解度先减少后增加,当pH值为8.36时,ZnS的溶解度最小,为10-7.69mol/L;Zn(OH)2溶解平衡时,随着pH值的增加,Zn(OH)2的溶解度也呈现先减少后增加,当pH值在9.41时Zn(OH)2的溶解度最小,为10-5.61mol/L;体系中ZnS和Zn(OH)2二者固相溶解平衡时,当S2-Zn2(+mol)时,pH在0~14范围内只生成ZnS沉淀,不会产生Zn(OH)(2s)物质。研究结果可为硫化沉淀法去除废水中锌等技术提供理论依据。 相似文献