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首页> 外文期刊>Journal of Hazardous Materials >Batch and bulk removal of hazardous dye, indigo carmine from wastewater through adsorption
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Batch and bulk removal of hazardous dye, indigo carmine from wastewater through adsorption

机译：通过吸附从废水中分批批量去除有害染料靛蓝胭脂红

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An inexpensive adsorption method has been developed for the removal of indigo carmine, a highly toxic indigoid class of dye from wastewater. Waste materials—bottom ash, a power plant waste and de-oiled soya, an agricultural waste have been used as adsorbents. Attempts have been made through batch and bulk removal of the dye and both the adsorbents have been found to exhibit good efficiency to adsorb indigo carmine. Under batch technique effect of temperature, pH, concentration, dosage of adsorbents, sieve size of adsorbents, etc. have been observed. The dye uptake on to both the adsorbents is found to validate Langmuir and Freundlich adsorption isotherms models. Different thermodynamic parameters, like Gibb's free energy, enthalpy and entropy of the on-going adsorption process have also been evaluated. Batch technique has also been employed for the kinetic measurements and the adsorption follows a first order rate kinetics for both the adsorbents. The kinetic investigations also reveal for both the adsorbents film diffusion and particle diffusion mechanisms are operative in the lower and higher concentration ranges, respectively. Under the bulk removal, indigo carmine has been adsorbed through the column beds of bottom ash and de-oiled soya and more than 90% of the dye material has been recovered by eluting dilute NaOH solution through exhausted columns.
机译：已经开发了一种廉价的吸附方法，用于从废水中去除靛蓝胭脂红，靛蓝胭脂红是一种剧毒的靛蓝类染料。废料-底灰，发电厂废料和脱油大豆，农业废料已用作吸附剂。通过分批和批量去除染料进行了尝试，并且发现两种吸附剂均表现出良好的吸附靛蓝胭脂红的效率。在分批技术中，已经观察到温度，pH，吸附剂的剂量，吸附剂的筛孔尺寸等的影响。发现两种吸附剂都吸收了染料，从而验证了Langmuir和Freundlich吸附等温线模型。还评估了不同的热力学参数，例如吉布的自由能，正在进行的吸附过程的焓和熵。批处理技术也已经用于动力学测量，并且对于两种吸附剂，吸附遵循一级速率动力学。动力学研究还表明，对于吸附剂而言，膜扩散和颗粒扩散机制分别在较低和较高浓度范围内均有效。在大量去除的情况下，靛蓝胭脂红已通过底灰和脱油大豆的柱床被吸附，并且通过用稀的NaOH溶液洗脱用过的柱子已回收了90％以上的染料。

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