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首页> 外文期刊>Separation and Purification Technology >Removal of crystal violet dye from wastewater by surfactant-modified alumina
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Removal of crystal violet dye from wastewater by surfactant-modified alumina

机译：表面活性剂改性氧化铝去除废水中的结晶紫染料

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Sodium dodecyl sulfate(SDS),an anionic surfactant(AS)was used for the surface modification of neutral alumina.Micelle-like structures are formed on the surface of alumina,which are capable of removing organic pollutants from water environment.The surfactant-modified alumina(SMA)was used for the removal of crystal violet(CV),a well-known cationic dye from aquatic environment.The kinetic studies showed that 1 h shaking time was sufficient to achieve the equilibrium.The removal of CV followed the second order kinetics.Studies were conducted to see the effects of adsorbent dose and initial CV concentration on the removal of CV using SMA.The pH was maintained at 6.7 +-0.1.SMA was found to be very efficient adsorbent,and ~99% efficiency could be achieved under optimised conditions for the removal of C V when present even at a high concentration(200 ppm).The effects of various other parameters such as pH,temperature,the presence of different ions(Cl~-NO_3~-,SO_4~(-2),HPO_4~(-2)and Fe~(3+)),and humic acid on the CV removal were also studied.The pH in the range of 7.0-8.5 favours the removal.It was observed that the removal efficiency was increased due to the presence of anions and humic acid and was decreased due to the presence of cations.Temperature had no effect in this process.To test whether the removal of C V was possible from real water using SMA,the adsorption study was conducted using CV spiked samples using distilled water,tap water and synthetically prepared wastewater.It was interesting to note that the removal efficiency was even better for tap water and much better for wastewater when compared to that using distilled water.Desorption of CV from the SMA surface was possible using 1 M sodium hydroxide solution,rectified spirit and acetone.
机译：阴离子表面活性剂（AS）十二烷基硫酸钠（SDS）用于中性氧化铝的表面改性。氧化铝表面形成胶束状结构，能够去除水环境中的有机污染物。用氧化铝（SMA）去除水生环境中一种著名的阳离子染料结晶紫（CV）。动力学研究表明，振摇时间为1 h足以达到平衡。去除CV遵循第二步进行了研究以观察吸附剂量和初始CV浓度对使用SMA去除CV的影响.pH保持在6.7 + -0.1。发现SMA是非常有效的吸附剂，可以达到〜99％的效率在最佳条件下即使在高浓度（200 ppm）存在时也能去除CV.pH，温度，各种离子（Cl〜-NO_3〜-，SO_4〜（- 2），HPO_4〜（-2）和Fe〜（3+）），还研究了腐殖酸对CV去除的影响.pH在7.0-8.5范围内有利于去除，观察到去除效率由于存在阴离子和腐殖酸而增加，而由于去除腐殖酸而降低。温度在此过程中没有影响。为测试是否可以使用SMA从真实水中去除CV，使用加标有蒸馏水，自来水和合成废水的CV加标样品进行了吸附研究。与蒸馏水相比，自来水的去除效果更好，废水的去除效果也更好。使用1 M氢氧化钠溶液，精馏酒精和丙酮可以使SMA表面的CV解吸。

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