Document Type : Research Paper
Authors
1
Department of Chemical Engineering, Babol Noshirvani University of Technology, Post Code 47148-71167Babol, Iran
2
Department of Chemical Engineering, Babol Noshirvani University of Technology, Shariati Ave., Babol, Iran, Post Code:47148-71167
3
Department of Chemical, Petroleum and Gas Engineering, National University of Skills, Tehran, Iran
10.22063/jipst.2024.2963.2089
Abstract
Hypothesis: Discharge of heavy metals into water effluents poses irreparable risks that must be necessarily removed. Although existing membrane technologies such as nanofiltration have played an important role in the removal of heavy metals due to their pore size, the concern raised by fouling in this process is considerable. On the contrary, due to the large pore size of the ultrafiltration membranes, the fouling phenomenon is small, but their ability to remove heavy metals is limited. Therefore, by the combination of absorption and ultrafiltration process in the form of photocatalytic absorption membrane, the advantages of these methods can be obtained simultaneously Methods: At first, polymeric ultrafiltration membrane was synthesized by phase inversion method. The photocatalytic nanoparticles synthesized as adsorbent were coated on the surface of the ultrafiltration membrane by a chitosan solution. In the next step, adsorption and reduction of Cr(VI) were investigated in continuous and batch systems. On the other hand, the antifouling property of the synthesized membrane was examined in a dead-end system by sodium alginate. PL, FTIR and XRD analyses were performed to confirm the synthesis of photocatalytic nanoparticles, while EDX FE-SEM and contact angle analyses were used to identify the morphology of the synthesized adsorption membrane Findings:The outcomes demonstrated that the addition of photocatalytic ZnO nanoparticles doped with Mg improved chromium removal performance from 39% to 70% and 77.8% under visible light and ultraviolet radiation, respectively. On the other hand, the addition of nanoparticles reduced the hydrophilicity of the membrane due to the lattice and wall-like structure of Mg-doped ZnO and thus reduced the amount of permeation flux from 53 to 33 and 28 L/m2h under visible and ultraviolet irradiation.
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