title: Zeolitic imidazolate framework-8 derived nanoporous carbon as an effective and recyclable adsorbent for removal of ciprofloxacin antibiotics from water.
abstract: The nanoporous carbons (NPC) derived from a one-step carbonization of zeolitic imidazolate framework-8 (ZIF-8) were synthesized and used for ciprofloxacin (CIP) removal from water. The resultant products were characterized by SEM, TEM, FT-IR, Raman, N2adsorption-desorption analysis, XRD, TGA and Zeta potential. The optimized NPC-700 (carbonized at 700°C for 2h) exhibited an optimal performance in CIP adsorption removal. CIP adsorption on NPC-700 as a function of contact time, initial CIP concentration, adsorbent dosage, pH, ionic strength and humic acid concentration were investigated. Kinetics of CIP removal was found to follow pseudo-second-order rate equation. Both Langmuir and Freundlich models fitted the adsorption data well and gave similar correlation coefficients (>0.96). However, Freundlich isotherm gave a better fit (r2=0.9969), suggesting a multilayer adsorption of CIP onto surface of NPC-700 adsorbent. The maximum adsorption capacity for CIP based on Langmuir model was 416.7mg/g, which was higher than those of other adsorbents. The NPC-700 material showed no apparent loss in CIP adsorption after seven cycles. These features reveal that the metal-organic framework (MOF) derived NPC may be a promising adsorbent for CIP removal from water.
authors.affiliation: The Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Siqi
authors.initials: S
authors.lastname: Li
authors.affiliation: The Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Xiaodan
authors.initials: X
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China. Electronic address: yuminghuang2000@yahoo.com.
authors.forename: Yuming
authors.initials: Y
authors.lastname: Huang
mesh_terms: D000327:Adsorption; D000465:Algorithms; D000900:Anti-Bacterial Agents / Q000302:isolation & purification*; D002614:Chelating Agents; D002939:Ciprofloxacin / Q000302:isolation & purification*; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D007700:Kinetics; D015233:Models, Statistical; D058608:Nanopores; D059027:Recycling; D013816:Thermodynamics; D014867:Water / Q000737:chemistry; D018508:Water Purification; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D002614:Chelating Agents; D006812:Humic Substances; D007093:Imidazoles; D014867:Water; D017641:Zeolites; D002939:Ciprofloxacin
keywords: Adsorption; Ciprofloxacin; Nanoporpous carbons; Zeolitic imidazolate framework-8