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首页> 外文期刊>RSC Advances >Development and application of novel bio-magnetic membrane capsules for the removal of the cationic dye malachite green in wastewater treatment
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Development and application of novel bio-magnetic membrane capsules for the removal of the cationic dye malachite green in wastewater treatment

机译：新型生物磁膜胶囊的开发与应用，用于去除废水处理中阳离子染料孔雀石绿

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Novel bio-magnetic membrane capsules (BMMCs) were prepared by a simple two-step titration-gel cross-linking method using a polyvinyl alcohol (PVA) and sodium alginate (SA) matrix to control the disintegration of phytogenic magnetic nanoparticles (PMNPs) in an aqueous environment, and their performance was investigated for adsorbing cationic malachite green (MG) dye from water. The prepared BMMCs were characterized by FTIR, powder XRD, SEM, EDX, XPS, VSM and TGA techniques. The findings revealed that the hysteresis loops had an excellent superparamagnetic nature with saturation magnetization values of 11.02 emu g ~(?1) . The prepared BMMCs not only controlled the oxidation of PMNPs but also improved the adsorptive performance with respect to MG dye (500 mg g ~(?1) at 298.15 K and pH 6.5) due to the presence of a large amount of hydrophilic functional groups (hydroxyl/–OH and carboxyl/–COOH) on/in the BMMCs. The smooth encapsulation of PMNPs into the PVA–SA matrix established additional hydrogen bonding among polymer molecular chains, with improved stability, and adsorptive performance was maintained over a wide range of pH values (3–12). Importantly, the prepared BMMCs were easily regenerated just by washing with water, and they could be re-utilized for up to four (4) consecutive treatment cycles without observing any apparent dissolution of iron/Fe ~(0) or damage to the morphology. According to the mass balance approach, an estimated amount of 100 mL of treated effluent can be obtained from 160 mL of MG dye solution (25 mg L ~(?1) ) just by employing a 0.02 g L ~(?1) adsorbent dosage. Finally, a model of BMMCs based on zero-effluent discharge was also proposed for commercial or industrial applications. The prepared BMMCs are greatly needed for improving the water/wastewater treatment process and they can be utilized as an excellent adsorbent to remove cationic pollutants for various environmental applications.
机译：通过使用聚乙烯醇（PVA）和藻酸钠（SA）基质的简单的两步滴定 - 凝胶交联方法制备新的生物磁性膜胶囊（BMMC），以控制植物磁性纳米粒子（PMNP）的崩解研究了水性环境，并研究了吸附来自水的阳离子孔雀石绿（Mg）染料。制备的BMCS以FTIR，粉末XRD，SEM，EDX，XPS，VSM和TGA技术为特征。结果表明，磁滞回路具有优异的超顺磁性，饱和磁化强度为11.02 emu g〜（α1）。制备的BMCS不仅控制PMNP的氧化，而且由于存在大量的亲水性官能团（以下），还通过在298.15k和pH6.5时提高了吸附性能（500mg g〜（α1）（500mg））（羟基/ -OH和羧基/ -COOH）上/在BMMC中。 PVA-SA基质的平滑封装在PVA-SA基质中，在聚合物分子链中建立了另外的氢键，具有改善的稳定性，并且在宽范围的pH值（3-12）上保持着吸附性能。重要的是，通过用水洗涤，可以容易地再生制备的BMMC，并且可以重新利用最多四（4）个连续的治疗循环，而不观察Iron / Fe〜（0）的任何表观溶解或对形态的损害。根据质量平衡方法，只需使用0.02g l〜（α1）吸附剂剂量，可以从160ml Mg染料溶液（25mg L〜（α1））获得100ml处理的流出物的估计量。 。最后，还提出了一种用于商业或工业应用的基于零污水排放的BMMC模型。对于改善水/废水处理过程，大大需要制备的BMCS，并且它们可以用作优异的吸附剂，以除去各种环境应用的阳离子污染物。

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