School of Civil and Chemical Engineering, VIT University, Vellore 632014, India.
J Environ Manage. 2018 Jan 15;206:215-227. doi: 10.1016/j.jenvman.2017.10.032. Epub 2017 Oct 23.
Protein Rich Solution (PRS) was prepared from the sewage sludge with ultrasonic assistance. With PRS, aluminium based nanosheet like materials (AlNs) were synthesised for the ultrasonic removal of Congo Red (CR) and Crystal Violet (CV) dyes. PRS was characterised by UV, EEM and NMR spectral analysis. AlNs were characterised by FTIR, XRD, TGA, BET, SEM, AFM, TEM and XPS analysis. The point of zero charge of AlNs was found to be 5.4. The BET analysis ensured that the average pore diameter and total pore volume of AlNs as 8.464 nm and 0.11417 cc/g respectively. The efficacy of AlNs for the removal of toxic dyes was tested by performing Response surface methodology (RSM) designed experiments. The effect of sonication time, dosage and initial concentration on dye removal was studied at an optimised pH value. Langmuir, Freundlich and Temkin isotherm models were examined. The maximum adsorption capacity was found to be 121.951 and 105.263 mg/g for CR and CV respectively. The kinetic models like pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion were examined to understand the mechanism behind it. The results revealed that the use of ultrasonication enhanced the mass transfer. The experimental studies on the influence of ultrasound power indicated a positive relation with the removal efficiency. The results of thermodynamic study revealed that the process was spontaneous and exothermic for both the dyes. The increase in ionic strength increased the removal efficiency for both CR and CV. RSM predicted the optimum adsorbent dosages as 0.16 g for 50 mg/L of CR and 0.12 g for 100 mg/L of CV dye solutions. The values of half-life and fractional adsorption for both CR and CV suggested that the low cost AlNs has high potential to remove the toxic industrial dyes.
采用超声辅助从污水污泥中制备富含蛋白质的溶液（PRS）。利用 PRS 合成了铝基纳米片状材料（AlNs），用于超声去除刚果红（CR）和结晶紫（CV）染料。通过 UV、EEM 和 NMR 光谱分析对 PRS 进行了表征。通过 FTIR、XRD、TGA、BET、SEM、AFM、TEM 和 XPS 分析对 AlNs 进行了表征。发现 AlNs 的零电荷点为 5.4。BET 分析确保 AlNs 的平均孔径和总孔体积分别为 8.464nm 和 0.11417cc/g。通过进行响应面法（RSM）设计实验，测试了 AlNs 去除有毒染料的功效。在优化的 pH 值下，研究了超声时间、剂量和初始浓度对染料去除的影响。研究了 Langmuir、Freundlich 和 Temkin 等温模型。发现 CR 和 CV 的最大吸附容量分别为 121.951 和 105.263mg/g。检查了动力学模型，如伪一级、伪二级、Elovich 和内扩散，以了解其背后的机制。结果表明，超声处理增强了质量传递。超声功率对实验研究的影响表明，去除效率呈正相关。热力学研究结果表明，该过程对于两种染料均为自发和放热的。离子强度的增加提高了两种 CR 和 CV 的去除效率。RSM 预测 50mg/L 的 CR 和 100mg/L 的 CV 染料溶液的最佳吸附剂剂量分别为 0.16g 和 0.12g。CR 和 CV 的半衰期和分数吸附值表明，低成本的 AlNs 具有去除有毒工业染料的高潜力。
