title: Magnetically separable maghemite/montmorillonite composite as an efficient heterogeneous Fenton-like catalyst for phenol degradation.
abstract: To develop highly efficient and conveniently separable iron containing catalysts is crucial to remove recalcitrant organic pollutants in wastewater through a heterogeneous Fenton-like reaction. A maghemite/montmorillonite composite was synthesized by a coprecipitation and calcination method. The physiochemical properties of catalysts were characterized by XRD, TEM, nitrogen physisorption, thermogravimetric analysis/differential scanning calorimetry (TG/DSC), zeta potential, and magnetite susceptibility measurements. The influence of calcination temperatures and reaction parameters was investigated. The calcined composites retain magnetism because the presence of montmorillonite inhibited the growth of γ-Fe2O3nanoparticles, as well as their phase transition. The catalytic activities for phenol degradation were significantly enhanced by calcinations, which strengthen the interaction between iron oxides and aluminosilicate framework and result in more negatively charged surface. The composite (73 m2/g) calcined at 350 °C had the highest catalytic activities, with more than 99 % phenol reduction after only 35 min reaction at pH 3.6. Simultaneously, this catalyst exhibited high stability, low iron leaching, and magnetically separable ability for consecutive usage, making it promising for the removal of recalcitrant organic pollutants in wastewater.
authors: School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450001, China.
authors: Mingjie
authors: M
authors: Jin
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China. Long_mc@sjtu.edu.cn.|Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, China. Long_mc@sjtu.edu.cn.
authors: Mingce
authors: M
authors: Long
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors: Hanrui
authors: H
authors: Su
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors: Yue
authors: Y
authors: Pan
authors: School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China.
authors: Qiuzhuo
authors: Q
authors: Zhang
authors: School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China.
authors: Juan
authors: J
authors: Wang
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.|Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, China.
authors: Baoxue
authors: B
authors: Zhou
authors: School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450001, China. zhangyanwu@zzu.edu.cn.
authors: Yanwu
authors: Y
authors: Zhang
mesh_terms: D001546:Bentonite / Q000737:chemistry*; D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D001546:Bentonite; D005290:Ferric Compounds; D006861:Hydrogen Peroxide; D010636:Phenols; D062065:Wastewater; D014874:Water Pollutants, Chemical; C000499:ferric oxide
keywords: Heterogeneous Fenton-like reaction; Maghemite; Magnetic separable; Montmorillonite; Phenol degradation; Wastewater