Detoxification of Carcinogenic Dyes by Noble Metal (Ag, Au, Pt) Impregnated Titania Photocatalysts

Sivakumar Thiripuranthagan, Valentine Rupa
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引用次数: 4

Abstract

Textile industries produce large quantities of waste water which is notoriously known to contain strong colour, suspended solids and COD. Although several treatment processes, such as filtration, coagulation, oxidation, ozonation, reverse osmosis, etc., have been practiced for many decades, they all have inherent limita-tions. They transfer the harmful pollutants from one phase to another and do not address detoxification. Semiconductor photocatalysis is a promising technique for photodegradation of hazardous chemicals found in waste waters. Among various semiconductors, TiO 2 has been studied widely. However, the main drawbacks associated with TiO 2 are (i) large band gap (Eg > 3.2 eV) (only UV active) and (ii) recombination of excitons. Dye sensitisation, coupling of semiconductors, and transitional metal doping are some of the methods reported to shift its optical response to visible region. Herein, nanoparticles of different noble metals such as Ag, Au and Pt were deposited on synthesised TiO 2 , characterized by XRD, TEM, FT-IR, BET, UV-Vis and AAS and were subjected to the degradation of some textile dyes namely Tartrazine (TAZ), Reactive Yellow-17 (RY-17) and Reactive Black-5 (RB-5) under both UV and visible irradiations. The reaction conditions such as catalyst concentration, dye concentration, pH, irradiation time, light intensity, and additives were optimized for complete decolourisation and discussed.
贵金属(Ag, Au, Pt)浸渍二氧化钛光催化剂对致癌染料的脱毒作用
纺织工业产生大量的废水,众所周知,这些废水含有强烈的颜色,悬浮物和COD。虽然几个治疗过程,如过滤、凝固、氧化、臭氧化,反渗透,等等,已经实行了几十年的人,他们都有固有的limita-tions。它们将有害污染物从一个阶段转移到另一个阶段,而不解决解毒问题。半导体光催化是一种很有前途的光降解废水中有害化学物质的技术。在各种半导体中,二氧化钛得到了广泛的研究。然而,与tio2相关的主要缺点是:(i)大带隙(Eg > 3.2 eV)(仅UV活性)和(ii)激子的重组。染料敏化、半导体耦合和过渡金属掺杂是将其光学响应转移到可见光区域的一些方法。,不同的贵金属纳米粒子如Ag)、非盟和Pt沉积在合成TiO 2, XRD, TEM, ir、打赌,紫外可见和AAS和受到一些纺织染料的降解即柠檬黄(小胡子)、活性黄17 (RY-17)和活性Black-5 (RB-5)紫外和可见的射线。对催化剂浓度、染料浓度、pH、辐照时间、光照强度、添加剂等条件进行了优化,并进行了讨论。
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