title: Ultrasound-promoted coating of MOF-5 on silk fiber and study of adsorptive removal and recovery of hazardous anionic dye "congo red".
abstract: A metal-organic framework MOF-5 has been synthesized on silk fiber through electrostatic layer-by-layer assembly. The silk surface coating was formed via sequential dipping in an alternating bath of metal and ligand solutions at room temperature by direct mixing. SEM was used to investigate the growth of MOF-5 coating as materials for separation membrane due to their desirable properties in adsorptive removal of congo red (CR) from contaminated water. The adsorption capacity of MOF-5 is remarkable high in the liquid phase. The adsorption of CR at various concentration and contact time in spontaneous process were studied. The silk fibers containing MOF-5 open a wide field of possible applications, such as protection layers or membranes in pollution remediation wastewater and any effluent. Desorption of the dye can be carried out by using NaOH solution with more than about 50% recovery of congo red from MOF-5 coated on silk membrane filtration. In order to investigate the role of sonicating on the morphology of products, one of the reactions was performed with ultrasound irradiation and the crystal growth is completed more than other methods. The samples and adsorption of CR were characterized with SEM, powder X-ray diffraction (XRD) and UV-visible spectroscopy.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, Islamic Republic of Iran. Electronic address: somayeh.kh412@gmail.com.
authors.forename: Somayeh
authors.initials: S
authors.lastname: Khanjani
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, Islamic Republic of Iran. Electronic address: Morsali_a@modares.ac.ir.
authors.forename: Ali
authors.initials: A
authors.lastname: Morsali
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D003224:Congo Red / Q000737:chemistry* / Q000302:isolation & purification*; D009942:Organometallic Compounds / Q000737:chemistry*; D047011:Silk / Q000737:chemistry*; D014465:Ultrasonics; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D004396:Coloring Agents; D009942:Organometallic Compounds; D047011:Silk; D014874:Water Pollutants, Chemical; D003224:Congo Red
keywords: Adsorption; Congo red; Layer-by-layer method; Metal–organic framework; Ultrasound irradiation