Biomaterial Database

New N-guanidinium chitosan/silica ionic microhybrids as efficient adsorbent for dye removal from waste water. 2018

Ahmed Salama, and Peter Hesemann

Institut Charles Gerhardt de Montpellier, UMR CNRS 5253 Université Montpellier-CNRS-ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France; Cellulose and Paper Department, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt. Electronic address: ahmed_nigm78@yahoo.com.

N-guanidinium chitosan acetate, a new chitosan derivative, was prepared via direct guanylation reaction between chitosan and cyanamide in the presence of scandium (III) triflate. Treatment of N-guanidinium chitosan acetate with 3-(trihydroxysilyl)-1-propanesulphonic acid followed by sol-gel reaction allowed accessing N-guanidinium chitosan silica hybrid material. The new ionic microhybrid was characterized using 13C and 29Si solid state NMR, IR spectroscopy, scanning electron microscopy and thermogravimetry. Further studies in the area of separation indicated very high adsorption capacity for cationic dyes such as methylene blue (MB), with capacities up to 935 mg/g. The adsorption kinetics can accurately be described by pseudo second-order model. Equilibrium adsorption data showed a better fit with Langmuir adsorption isotherm model. Recycling test showed that the ionic microhybrid can be reused in at least five adsorption-desorption cycles. These results open new perspectives and possibilities for the design of novel hybrid adsorbents for industrial and environmental applications.

UI	MeSH Term	Description	Entries
D007477	Ions	An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
D004396	Coloring Agents	Chemicals and substances that impart color including soluble dyes and insoluble pigments. They are used in INKS; PAINTS; and as INDICATORS AND REAGENTS.	Coloring Agent,Dye,Dyes,Organic Pigment,Stain,Stains,Tissue Stain,Tissue Stains,Organic Pigments,Pigments, Inorganic,Agent, Coloring,Inorganic Pigments,Pigment, Organic,Pigments, Organic,Stain, Tissue,Stains, Tissue
D000327	Adsorption	The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.	Adsorptions
D001391	Azo Compounds	Organic chemicals where aryl or alkyl groups are joined by two nitrogen atoms through a double bond (R-N	Azo Dye,Azo Dyes,Compounds, Azo,Dye, Azo,Dyes, Azo
D012822	Silicon Dioxide	Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.	Silica,Aerosil,Aerosil 380,Cristobalite,Quso G-32,Quso G32,Tridymite,380, Aerosil,Dioxide, Silicon,G32, Quso,Quso G 32
D013818	Thermogravimetry	Technique whereby the weight of a sample can be followed over a period of time while its temperature is being changed (usually increased at a constant rate).	Thermogravimetries
D014874	Water Pollutants, Chemical	Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.	Chemical Water Pollutants,Landfill Leachate,Leachate, Landfill,Pollutants, Chemical Water
D048271	Chitosan	Deacetylated CHITIN, a linear polysaccharide of deacetylated beta-1,4-D-glucosamine. It is used in HYDROGEL and to treat WOUNDS.	Poliglusam
D052578	Ionic Liquids	Salts that melt below 100 C. Their low VOLATILIZATION can be an advantage over volatile organic solvents.	Ionic Liquid,Ionic Solvents,Liquid, Ionic,Liquids, Ionic,Solvents, Ionic
D062065	Wastewater	Contaminated water generated as a waste product of human activity.	Waste Water,Waste Waters,Wastewaters,Water, Waste,Waters, Waste