title: A novel approach for removing 2-naphthol from wastewater using immobilized organo-bentonite.
abstract: The major concern limiting the industrial application of organo-bentonite in powder form (P-Bent) for wastewater treatment is that it is difficult to separate it from treated water by settlement. To address this problem, a novel approach for synthesizing immobilized organo-bentonite in globular form (G-Bent) is proposed. The G-Bent is modified using the cationic surfactant cetylpyridinium chloride (CPC) and immobilized by polyvinyl alcohol (PVA). The removal of 2-naphthol by G-Bent was compared with removal by P-Bent for solid/liquid separation, removal efficiency and desorption of the modifier used in its preparation. Results indicated that G-Bent was easy to recover from treated wastewater, and was effective and reusable in removing 2-naphthol. The percentage of 2-naphthol removed by G-Bent exceeded 90% with the cationic exchange capacity (CEC) loadings ranging from 100% to 150%. This was almost equivalent to the results obtained using P-Bent. In the five rounds of reuse examined, the percentage of 2-naphthol removed was maintained above 50% for 150%-G-Bent. The percentage of CPC desorption was less than 0.75% after five rounds of reuse and no PVA was detected. The results of this work provide novel information for using G-Bent in the treatment of wastewater containing organic contaminants.
authors.affiliation: Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Sun
authors.forename: Wenfei
authors.initials: W
authors.lastname: Huang
authors.forename: Zhanyu
authors.initials: Z
authors.lastname: Ma
authors.forename: Yingying
authors.initials: Y
authors.lastname: Lu
authors.forename: Xueyou
authors.initials: X
authors.lastname: Shen
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D002594:Cetylpyridinium / Q000737:chemistry; D007474:Ion Exchange; D009284:Naphthols / Q000737:chemistry*; D011142:Polyvinyl Alcohol / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001546:Bentonite; D002594:Cetylpyridinium; D009284:Naphthols; D011142:Polyvinyl Alcohol; D013501:Surface-Active Agents; D062065:Wastewater; D014874:Water Pollutants, Chemical; C028405:2-naphthol