title: Adsorptive removal of phenolic compounds using cellulose acetate phthalate-alumina nanoparticle mixed matrix membrane.
abstract: Mixed matrix membranes (MMMs) were prepared using alumina nanoparticles and cellulose acetate phthalate (CAP) by varying concentration of nanoparticles in the range of 10 to 25wt%. The membranes were characterized by scanning electron micrograph, porosity, permeability, molecular weight cut off, contact angle, surface zeta potential, mechanical strength. Addition of nanoparticles increased the porosity, permeability of the membrane up to 20wt% of alumina. pH at point of zero charge of the membrane was 5.4. Zeta potential of the membrane became more negative up to 20wt% of nanoparticles. Adsorption of phenolic derivatives, catechol, paranitrophenol, phenol, orthochloro phenol, metanitrophenol, by MMMs were investigated. Variation of rejection and permeate flux profiles were studied for different solutes as a function of various operating conditions, namely, solution pH, solute concentration in feed and transmembrane pressure drop. Difference in rejection of phenolic derivatives is consequence of interplay of surface charge and adsorption by alumina. Adsorption isotherm was fitted for different solutes and effects of pH were investigated. Catechol showed the maximum rejection 91% at solution pH 9. Addition of electrolyte reduced the rejection of solutes. Transmembrane pressure drop has insignificant effects on solute rejection. Competitive adsorption reduced the rejection of individual solute.
authors: Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
authors: Raka
authors: R
authors: Mukherjee
authors: Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India. Electronic address: sde@che.iitkgp.ernet.in.
authors: Sirshendu
authors: S
authors: De
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D053758:Nanoparticles / Q000737:chemistry*; D010539:Permeability; D010636:Phenols / Q000737:chemistry*; D016062:Porosity; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D008567:Membranes, Artificial; D010636:Phenols; D014874:Water Pollutants, Chemical; D002482:Cellulose; C011708:cellulose acetate phthalate; D000537:Aluminum Oxide
keywords: Adsorption; Alumina nanoparticle; CAP; CAPAl-0; CAPAl-10; CAPAl-15; CAPAl-20; CAPAl-25; CC; Charged surface; Electrostatic attraction; MEUF; MMM; MNP; OCP; PNP; Ph; Phenolic compounds; catechol; cellulose acetate phthalate; membrane with CAP and 0% alumina nanoparticle; membrane with CAP and 10% alumina nanoparticle; membrane with CAP and 15% alumina nanoparticle; membrane with CAP and 20% alumina nanoparticle; membrane with CAP and 25% alumina nanoparticle; meta-nitrophenol; micellar enhanced ultrafiltration; mixed-matrix membrane; nanoparticle; np; orthochlorophenol; para-nitrophenol; phenol