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首页> 外文期刊>Advances in Chemical Engineering and Science >Applicative Study (Part I): The Excellent Conditions to Remove in Batch Direct Textile Dyes (Direct Red, Direct Blue and Direct Yellow) from Aqueous Solutions by Adsorption Processes on Low-Cost Chitosan Films under Different Conditions
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Applicative Study (Part I): The Excellent Conditions to Remove in Batch Direct Textile Dyes (Direct Red, Direct Blue and Direct Yellow) from Aqueous Solutions by Adsorption Processes on Low-Cost Chitosan Films under Different Conditions

机译：应用研究（第一部分）：低成本壳聚糖薄膜在不同条件下通过吸附工艺从水溶液中分批去除直接纺织染料（直接红，直接蓝和直接黄）的优良条件

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In recent years the development of chitosan (CH) based materials as useful adsorbent polymeric matrices is an expanding field in the area of adsorption science. Even though CH has been successfully used for dye removal from aqueous solutions due to its low cost, no considerations have been made about, for example, the effect of changing the pH of chitosan hydrogelor about the dehydrating effect of Ethanol (EtOH) treatment of chitosan film on the dyes removal from water. Consequently in our laboratory we carried out a study focusing the attention, mainly, on the potential use of CH films under different conditions, such as reducing the intrinsic pH, increasing the hydrophobic character by means of ethanol treatment and neutralization of CH films to improve their absorption power. Textile anionic dyes named Direct Red 83:1, Direct Yellow 86 and Direct Blue 78 have been studied with the aim of reducing the contact time of CH film in waste water improving the bleaching efficiency. Neutralized acid CH film and longtime dehydrated one result to be the better films in dye removal from water. Also the reduction of the CH solution acidity during the film preparation determines the decreasing of the contact time improving the results. The effect of initial dye concentration has been examined and the amount of dye adsorption in function of time t, qt (mg/cm2), for each analyzed film has been evaluated comparing the long term effect with the decoloration rate. A linear form of pseudo-first-order Lagergren model has been used and described. The best condition for removing all examined dyes from various dye solutions appears to be the dehydration of a novel projected CH film obtained by means of the film immersion in EtOH for 4 days. Also CH films prepared by well-known literature procedure and neutralized with NaOH treatment appear having an excellent behavior, however the film treatment requires a large quantity of water and time.
机译：近年来，基于壳聚糖（CH）的材料作为有用的吸附性聚合物基体的开发是吸附科学领域的一个扩展领域。尽管CH由于其成本低廉而已成功地用于从水溶液中去除染料，但尚未考虑到例如改变壳聚糖水凝胶的pH值的效果，以及乙醇（EtOH）处理壳聚糖的脱水效果膜上的染料从水中去除。因此，在我们的实验室中，我们进行了一项研究，重点关注的焦点主要是在不同条件下使用CH膜的潜在用途，例如降低固有pH值，通过乙醇处理提高疏水性以及中和CH膜以改善其性能。吸收能力。为了减少废水中CH膜的接触时间，提高漂白效率，已经研究了纺织品阴离子染料Direct Red 83：1，Direct Yellow 86和Direct Blue 78。结果表明，中和的酸性CH膜和长时间脱水是从水中去除染料的较好膜。膜制备过程中CH溶液酸度的降低也决定了接触时间的减少，从而改善了结果。已经检查了初始染料浓度的影响，并且针对每种被分析的膜，评估了染料吸附量随时间t qt（mg / cm2）的变化，并比较了长期效果和脱色率。线性形式的伪一阶Lagergren模型已被使用和描述。从各种染料溶液中去除所有检查的染料的最佳条件似乎是通过将膜浸入EtOH中4天而获得的新型投影CH膜的脱水。通过众所周知的文献方法制备并用NaOH处理中和的CH膜也表现出优异的性能，但是该膜处理需要大量的水和时间。

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