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81.
利用羧基化碳纳米管作为催化剂,强化臭氧化脱色三苯甲烷染料废水。结果表明,当羧基化碳纳米管存在下,碱性品红废水的脱色率显著增加,在初始pH值为6.0,温度为25℃,初始染料浓度为100 mg/L,羧基化碳纳米管用量为6 mg/L时,30 min后脱色率达到94%。羧基化碳纳米管的催化性能高是由于碳纳米管特殊的纳米结构和—COOH基团,从而促进了臭氧化过程。羧基化碳纳米管可以强化臭氧化脱色三苯甲烷染料废水,对碱性品红、结晶紫、灿烂绿和孔雀石绿4种染料废水均能达到良好的脱色效果。 相似文献
82.
铜铁氧体法处理模拟染料废水 总被引:4,自引:0,他引:4
探讨了不同反应条件对铜铁氧体法(in situ copper ferrite process)处理亚甲基蓝、结晶紫、刚果红和酒石黄这4种不同模拟染料废水的效果,并以亚甲基蓝模拟染料废水为例,研究了铁氧体法处理染料废水的反应热力学和生成沉淀物的物理化学性质,提出了铜铁氧体法处理模拟染料废水的主要机制.结果表明,通过调节铜铁氧体法的反应条件对4种模拟染料废水均可取得良好的处理效果.在c(Cu2+)=0.01 mol·L-1,c(Fe2+)=0.025 mol·L-1,c(OH)/c(M)=1.7(投加的氢氧根离子与金属的摩尔比),T=40℃,t=60 min的条件下,铜铁氧体法对亚甲基蓝、酒石黄、结晶紫、刚果红这4种模拟染料废水的最大处理能力分别达到349.2、382.2、402.5、831.8 mg·g-1.铜铁氧体法处理模拟染料废水的机制主要是高活性的新生态Fe-Cu沉淀物对染料分子的高效吸附和在沉淀物聚集过程中的卷扫、包裹作用.沉淀物通过磁分离、分解提纯、高温煅烧可生成铜铁氧体晶体材料回收利用. 相似文献
83.
采用液相还原法并使用氨基修饰的二氧化硅合成包覆型的纳米零价铁(nZVI@SiO_2-NH_2),同时,采用XRD、FT-IR及TEM等多种方法对所制备的材料进行表征.TEM表征结果表明,nZVI@SiO_2-NH_2粒径分布在10~50 nm之间,壳层厚度为15 nm.XRD和FTIR分析表明,复合颗粒具有Fe~0晶型结构的内核,表面SiO_2壳层存在氨基化修饰.使用nZVI@SiO_2-NH_2和nZVI对各类染料进行脱色处理,结果表明,nZVI@SiO_2-NH_2对上述染料的脱色效果都优于nZVI,且nZVI@SiO_2-NH_2具有对染料进行连续脱色的能力.大肠杆菌的存活情况和细胞内酶LDH和SOD的活性变化表明,nZVI@SiO_2-NH_2对生物的毒性更小. 相似文献
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Considering the amount of colored waste water generated from many industries (textile, leather, paper, printing, dyestuff, and plastic) that are sent to various water bodies and the ecosystem, the search for efficient and better methods of purification still continues. With the recent research into metal organic frameworks (MOFs), there is a steady growing interest worldwide for their various applications. This article presents a review of MOFs, their application in dye adsorption and their various challenges and future prospects. It was concluded that with the current interest, research and development for various applications, there are possibilities which will bring to limelight more laboratory, industrial and environmental usage of MOFs as dye adsorbents. 相似文献
89.
Wool dyeing wastewater contains xenobiotic compounds that can be removed by biotechnological processes. Studies on various dyes showed that anaerobic processes are suitable to alter azo dyes as a first step of the biodegradation process. These compounds are reduced by anaerobic consortia to aromatic amines and its ultimate degradation can be achieved by a further aerobic treatment. Studies on degradation rate of an wool acid dye were performed in batch systems inoculated with anaerobic biomass. A commercial diazo dye, Acid Red 73, was added to the synthetic medium in which glucose was used as sole carbon source. Results indicated that the Acid Red 73 was partially degraded by a mixed culture of anaerobic bacteria and a decolorization of 90% was obtained. Kinetics studies on removal of the colour showed that the decolorization rate was several times faster than the degradation rate of glucose for a range of dye concentrations between 60 mg/L and 400 mg/L. A first order kinetic model was used for dye concentrations up to 200 mg/L. For higher concentrations a model similar to the Michaelis‐Menten equation was better fitted to the experimental data. 相似文献
90.
Aqueous biphasic systems (ABSs) composed of polyethylene glycol (PEG) and salt have been examined for the removal of textile dyes from textile effluent. The partitioning of four dyes namely Cibacron Scarlet LS 2G, Rhodamine B, Brown ERN and Astacryl Red 3B was investigated. All the dyes studied were found to partition into the upper PEG rich layer. Sodium carbonate was found to be the most efficient salt for extraction of dyes. Sodium sulphate was found to be marginally less efficient. Sodium chloride did not cause partitioning at all. Partitioning occurred at all pH and was almost pH independent. The partitioning of these dyes in larger volume (100?mL) ABS was also demonstrated. Studies using dye bath effluent were also conducted. In all cases very high efficiencies consistently above 98% were obtained. 相似文献