title: From illite/smectite clay to mesoporous silicate adsorbent for efficient removal of chlortetracycline from water.
abstract: A series of mesoporous silicate adsorbents with superior adsorption performance for hazardous chlortetracycline (CTC) were sucessfully prepared via a facile one-pot hydrothermal reaction using low-cost illite/smectite (IS) clay, sodium silicate and magnesium sulfate as the starting materials. In this process, IS clay was "teared up" and then "rebuilt" as new porous silicate adsorbent with high specific surface area of 363.52m2/g (about 8.7 folds higher than that of IS clay) and very negative Zeta potential (-34.5mV). The inert SiOSi (Mg, Al) bonds in crystal framework of IS were broken to form Si(Al) O-groups with good adsorption activity, which greatly increased the adsorption sites served for holding much CTC molecules. Systematic evaluation on adsorption properties reveals the optimal silicate adsorbent can adsorb 408.81mg/g of CTC (only 159.7mg/g for raw IS clay) and remove 99.3% (only 46.5% for raw IS clay) of CTC from 100mg/L initial solution (pH3.51; adsorption temperature 30°C; adsorbent dosage, 3g/L). The adsorption behaviors of CTC onto the adsorbent follows the Langmuir isotherm model, Temkin equation and pseudo second-order kinetic model. The mesopore adsorption, electrostatic attraction and chemical association mainly contribute to the enhanced adsorption properties. As a whole, the high-efficient silicate adsorbent could be candidates to remove CTC from the wastewater with high amounts of CTC.
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Clay Mineral Applied Research of Gansu Province, Lanzhou 730000, China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Wang
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Guangyan
authors.initials: G
authors.lastname: Tian
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Clay Mineral Applied Research of Gansu Province, Lanzhou 730000, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zong
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Yanmin
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Clay Mineral Applied Research of Gansu Province, Lanzhou 730000, China.
authors.forename: Yuru
authors.initials: Y
authors.lastname: Kang
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Clay Mineral Applied Research of Gansu Province, Lanzhou 730000, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Clay Mineral Applied Research of Gansu Province, Lanzhou 730000, China. Electronic address: aqwang@licp.cas.cn.
authors.forename: Aiqin
authors.initials: A
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000032:analysis / Q000737:chemistry*; D002751:Chlortetracycline / Q000032:analysis / Q000737:chemistry*; D000077215:Clay; D007700:Kinetics; D008903:Minerals / Q000737:chemistry; D008956:Models, Chemical; D017640:Silicates / Q000737:chemistry; D013696:Temperature; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D000900:Anti-Bacterial Agents; D002751:Chlortetracycline; D000077215:Clay; D008903:Minerals; D017640:Silicates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C099089:illite; C033214:Smectite; C005691:sodium silicate
keywords: Chlortetracycline; Hybrid silicate adsorbent; Illite/smectite clay; Removal