Nano Composite Membranes Research Paper

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The objective of this research was to use tannic acid (TA) as polyphenol monomer to synthesize the nano-composite membranes and its application for dye removal from water. The chemical cross-linking reaction between the acyl chloride groups in organic solution and polysufone porous ultrafiltration membrane and also phenolic groups in aqueous solution and acyl chloride groups in organic solution accomplished in the water/oil interfacial zone. The combined effects of factors were studied by Response Surface Methodology (RSM). Then, the rejection of direct blue 71, fouling mechanism and antifouling properties of the nano-composite membranes were investigated and the prepared membrane was conducted for dye removal at optimum conditions. Synthesized…show more content…
Synthetic dyes have a various structure. The azo, sulfur, triphenylmethyl, phthalocyanine, anthraquinone and indigoid are the most chemical classes of dyes. However, the azo derivatives are the majority of synthetic dyes that employed in the industry. Nowadays, more than 100000 dyes are commercially recognized and the amount of dyes produced in the world is estimated about 10000 tons per year. It is estimated that about 1-2% in the production phase (about 40-65 L of textile effluent per kg of produced cloth (4-6) and 1-10% in the use phase can be discharged in the environment. Also, textile wastewater contains high suspended solids, chemical oxygen demand, biological oxygen demand, heat and chemicals such as salts as well as high color (7, 8). The synthetic dyes have a complex aromatic structure that cause them increasingly resistant to biodegradation and stable (9-11). Thus, dye wastewater are potentially carcinogen and toxic for the environments (3, 12). Therefore, synthetic dyes can create adverse effects on the environment as well as health. The environmental concern related to synthetic dyes is due to their recalcitrance nature as well as their high visibility (1, 4, 13). Several technologies have been employed for the synthetic dyes removal from colored waters and wastewaters that involve biological or enzymatic processes, adsorption, photocatalysis, oxidation process, membrane filtration, precipitation and ion exchange (7, 9). High cost, low efficiency and complexity of the operation and maintenance are the disadvantage of these technologies (3,

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