Abstract

The high amount of hexavalent chromium in contaminated water must be removed because it can have serious implications on human health. Prolonged exposure to hexavalent chromium can lead to kidney damage and lung cancer in humans. The adsorption of hexavalent chromium from synthetic solution onto mussel shell (MS)-incorporated polyethersulfone (PES) flat sheet adsorptive membranes applied to a flat sheet adsorptive membrane crossflow (FSAMC) treatment system was studied in this work. The MS-PES flat sheet membranes were prepared by varying the mass ratio of MS-PES from 0 to 0.5, 1.0, and 1.5. The instrumental analysis was used to determine the physicochemical properties of the MS-PES membranes. The chemical composition of MS was analyzed using an energy-dispersive X-ray fluorescence spectrometer. The Brunauer-Emmett-Teller surface area of MS was determined by the multiple-point method using a surface analyzer. The surface and cross-sectional features of MS-PES membranes were observed under a scanning electron microscope. The analysis of water contact angle and porosity of MS-PES membranes was conducted using a contact angle goniometer and the gravitational method, respectively. The maximum adsorption capacity of 6.45 mg g^–1 was obtained for the adsorption of hexavalent chromium onto MS-PES (1.0) membrane from synthetic solution. The analysis of experimental data was performed using the mass transfer factor models to determine the resistance of mass transfer (RMT) for the adsorption of hexavalent chromium from synthetic solution onto MS-PES membranes, which is dependent on either film mass transfer or porous diffusion. This work determined that the RMT for the adsorption of hexavalent chromium from synthetic solution onto MS-PES membranes applied to the FSAMC treatment system is dependent on film mass transfer. The knowledge of the RMT for transporting hexavalent chromium onto MS-PES membranes is considered expedient for designing an advanced water treatment system to release hexavalent chromium-free treated water.

中文翻译：

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Cr(VI) 从合成溶液吸附到贻贝壳聚醚砜平板膜上：传质因子模型的应用

摘要

必须去除受污染水中的大量六价铬，因为它会对人类健康产生严重影响。长期接触六价铬会导致人类肾脏受损和肺癌。本工作研究了将合成溶液中的六价铬吸附到贻贝壳 (MS) 结合的聚醚砜 (PES) 平板吸附膜上，该平板吸附膜应用于平板吸附膜错流 (FSAMC) 处理系统。通过将 MS-PES 的质量比从 0 变为 0.5、1.0 和 1.5 来制备 MS-PES 平板膜。仪器分析用于确定 MS-PES 膜的物理化学性质。使用能量色散 X 射线荧光光谱仪分析 MS 的化学成分。MS 的 Brunauer-Emmett-Teller 表面积使用表面分析仪通过多点法测定。在扫描电子显微镜下观察 MS-PES 膜的表面和横截面特征。分别使用接触角测角仪和重力法对 MS-PES 膜的水接触角和孔隙率进行了分析。最大吸附量6.45 mg g^–1是从合成溶液中将六价铬吸附到 MS-PES (1.0) 膜上而获得的。使用传质因子模型对实验数据进行分析，以确定六价铬从合成溶液吸附到 MS-PES 膜上的传质阻力 (RMT)，这取决于薄膜传质或多孔扩散。这项工作确定了将合成溶液中的六价铬吸附到应用于 FSAMC 处理系统的 MS-PES 膜上的 RMT 取决于薄膜传质。将六价铬传输到 MS-PES 膜上的 RMT 知识被认为有助于设计先进的水处理系统以释放无六价铬的处理水。