Adsorptive removal of ciprofloxacin by sodium alginate/graphene oxide composite beads from aqueous solution.
Graphene oxide (GO) was encapsulated into environmentally benign sodium alginate (SA) to prepare a GO-SA composite hydrogel and an aerogel, which were then used as adsorbents to remove ciprofloxacin from aqueous solutions. The characteristics of these materials were investigated using scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The characterizations demonstrated that the incorporation of GO improved the pore uniformity of the gels and decreased the pore sizes. Kinetic studies showed that the adsorption capacity of SA composite gels increased approximately seven to nine times after the incorporation of GO, matching with pseudo-second-order models. Non-linear fitting parameters of adsorption isotherm studies indicated that a Langmuir model could precisely represent the adsorption behavior. GO-SA aerogels exhibited high tolerance to changes in pH and ionic strength; changes in these parameters minimally influenced the adsorption capacity of the GO-SA aerogels for ciprofloxacin. This work is especially relevant for environmental applications. These graphene-based composites are environmentally benign adsorbents and can remove organic contaminants from aqueous solutions.
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Hai Quan Road, Shanghai 201418, China; State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Yu
Y
Fei
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Hai Quan Road, Shanghai 201418, China.
Yong
Y
Li
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Hai Quan Road, Shanghai 201418, China. Electronic address: hansheng654321@sina.com.
Sheng
S
Han
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Hai Quan Road, Shanghai 201418, China; State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China. Electronic address: jma@tongji.edu.cn.
Jie
J
Ma
D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D002939:Ciprofloxacin / Q000302:isolation & purification*; D005782:Gels; D020723:Glucuronic Acid / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D006603:Hexuronic Acids / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009994:Osmolar Concentration; D010087:Oxides; D016062:Porosity; D013816:Thermodynamics; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D000464:Alginates; D002939:Ciprofloxacin; D005782:Gels; D020723:Glucuronic Acid; D006108:Graphite; D006603:Hexuronic Acids; D010087:Oxides; D062065:Wastewater; D014874:Water Pollutants, Chemical
Adsorption; Ciprofloxacin; Gel; Graphene; Sodium alginate