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首页> 外文期刊>Journal of industrial pollution control >EFFECT OF INORGANIC IONS, SOLAR LIGHT INTENSITY AND CATALYST REUSE ON PHOTOCATALYTIC DECOLOURISATION OF TEXTILE DYEING WASTEWATERS
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EFFECT OF INORGANIC IONS, SOLAR LIGHT INTENSITY AND CATALYST REUSE ON PHOTOCATALYTIC DECOLOURISATION OF TEXTILE DYEING WASTEWATERS

机译：无机离子，太阳光强度和催化剂的再利用对纺织印染废水光催化脱氯的影响

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In this study, the effects of inorganic ions, solar ultraviolet (UV) light intensity and catalyst reuse on the rate of decolourisation of simulated low salt cotton textile dyeing rinse wastewaters (SRWWs) were studied with Degussa P25 and indigenous IS grade titanium dioxide (TiO_2) catalysts. SRWWs were prepared with dye concentration of 40 mg/L. Catalyst concentration of 0.1g/L for indoor UV studies and 1.0g/L for outdoor solar studies were adopted in general. For both the catalysts, the rate of decolourisation decreased significantly with increase in carbonate ion, whereas it was not affected by the presence of chloride and sulphate ions under UV and solar light sources. It was observed that the rate of decolourisation increased with increase of solar UV light intensity. As the light intensity increased from 20.8 to 39.1 W/m~2, the reaction time (i.e. time taken for 90% decolourisation) decreased from 72 to 35 minutes for P25 TiO_2 and 175 to 106 minutes for IS TiO_2. When the intensity of solar UV light was less than 20 W/m~2, the reaction time increased several times. Hence, it could be concluded that solar UV light intensity of 20 W/m~2 was necessary for photocatalytic decolourisation of the dyes. The photoactivity of both P25 and IS TiO_2 catalysts were not affected by the reuse of the catalysts for 20 cycles.
机译：在这项研究中，使用Degussa P25和本国IS级二氧化钛（TiO_2）研究了无机离子，太阳紫外线（UV）强度和催化剂再利用对模拟低盐棉纺织染漂废水（SRWWs）脱色率的影响。 ）催化剂。 SRWWs的染料浓度为40 mg / L。通常，室内紫外线研究的催化剂浓度为0.1g / L，室外太阳能研究的催化剂浓度为1.0g / L。对于这两种催化剂，脱色率均随碳酸根离子的增加而显着降低，而不受紫外线和太阳光源下氯离子和硫酸根离子的存在的影响。观察到，脱色率随着太阳紫外线强度的增加而增加。随着光强度从20.8增加到39.1 W / m〜2，P25 TiO_2的反应时间（即90％脱色所需的时间）从72分钟减少到35分钟，IS TiO_2的反应时间从175分钟减少到106分钟。当太阳紫外线强度小于20 W / m〜2时，反应时间增加了数倍。因此，可以得出结论，染料的光催化脱色需要20 W / m〜2的太阳紫外线强度。 P25和IS TiO_2催化剂的光活性均不受20次循环再使用的影响。

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