A low cost polyvinyl alcohol-glutaraldehyde cross-linked hydrogel beads were prepared and used for color removal from model industrial effluent containing Congo Red dye, using adsorption technique. The adsorption studies were performed using batch and fixed-bed reactor. Developed adsorbent, achieved adsorption capacity as high as ~34 mg of dye per gram of bead (condition: pH 6 and 45 °C). These beads were re-used for 7 times (many more runs possible) to remove the color from model dye effluent, without much loss in removal efficiency. Batch studies revealed a multi-layer adsorption governed by Harkins Jura model. Whereas the adsorption kinetics followed fractal like pseudo second order model, controlled by intraparticle diffusion phenomena. The fixed bed studies revealed steeper break through curves during adsorption operation when high dye influent rates and low bed height were used. This behaviour by the fixed bed reactor was best explained by the Thomas mathematical model. Studies further demonstrated that an external and internal mass diffusion become no more rate limiting during these experiments.

制备了低成本的聚乙烯醇-戊二醛交联的水凝胶珠，并使用吸附技术将其从含有刚果红染料的模型工业废水中脱色。使用间歇和固定床反应器进行吸附研究。开发了吸附剂，实现了每克珠粒高达34 mg的染料吸附能力（条件：pH 6和45°C）。这些珠粒可重复使用7次（可能进行更多次运行），以从模型染料流出物中去除颜色，而去除效率却没有太大损失。批处理研究显示了由Harkins Jura模型控制的多层吸附。而吸附动力学遵循分形，如伪二阶模型，受颗粒内扩散现象控制。固定床研究表明，当使用高染料流入速率和低床高度时，吸附操作过程中的穿透曲线更陡。托马斯数学模型可以最好地解释固定床反应器的这种行为。研究进一步表明，在这些实验中，内部和外部质量扩散不再受速率限制。