Department of Chemical and Petroleum Engineering, University of Calgary, Alberta, T2N 1N4, Canada.
Department of Earth and Environmental Science, Al-Quds University, P.O Box 20002, Jerusalem, Palestine.
Chemosphere. 2020 Aug;252:126523. doi: 10.1016/j.chemosphere.2020.126523. Epub 2020 Mar 18.
A commercial filter aid material of Diatomite was modified via loading it with a low mass fraction of polyethylenimine-functionalized pyroxene nanoparticles (PEI-PNs) to enhance its adsorption activities. The modified Diatomite was then used for Cr(VI) removal from dichromate solution and from real tannery wastewater. For the synthetic wastewater, batch adsorption experiments were first performed at various pH and Cr(VI) initial concentrations. Then, the obtained kinetic parameters were used to investigate the continuous adsorption inside the fixed-bed column. The continuous removal of the Cr(VI) was performed inside a fixed-bed column under various influent flow rates, Cr(VI) initial concentrations, and bed-heights. In the column experiments, high adsorption of Cr(VI) was observed at low flow rates, high bed heights, and low influent initial concentrations. A dimensionless form of the advection-axial dispersion model, featuring Peclet number as a fitting parameter, was then used to study the breakthrough behavior under various dynamic parameters. Afterward, the modified Diatomite was used to remediate well characterized real tannery wastewater. For the treatment of the tannery wastewater, our modified filter aid, compared with the non-modified one, showed an outstanding performance and a higher removal efficiency.
一种商业硅藻土过滤助剂通过负载低质量分数的聚乙烯亚胺功能化辉石纳米颗粒（PEI-PNs）进行了改性，以增强其吸附活性。然后，将改性硅藻土用于从重铬酸盐溶液和实际制革废水中去除 Cr(VI)。对于合成废水，首先在不同的 pH 值和 Cr(VI)初始浓度下进行批量吸附实验。然后，使用获得的动力学参数研究固定床柱内的连续吸附。在各种流速、Cr(VI)初始浓度和床层高度下，在固定床柱内连续去除 Cr(VI)。在柱实验中，在低流速、高床层高度和低入口初始浓度下观察到 Cr(VI)的高吸附。然后，使用以 Peclet 数为拟合参数的对流-轴向扩散模型的无量纲形式来研究各种动态参数下的穿透行为。之后，将改性硅藻土用于修复具有良好特征的实际制革废水。对于制革废水的处理，与未改性的相比，我们的改性过滤助剂表现出出色的性能和更高的去除效率。
