Facile synthesis and highly efficient selective adsorption properties of Y2Mo4O15 for methylene blue:Kinetics,thermodynamics and mechanical analyses
来源期刊：Journal of Rare Earths2018年第8期
论文作者：Junhua You Renchao Wang Chaobin Liu Xiaojie Shi Fei Han Rui Guo Xuanwen Liu
文章页码：844 - 850
摘 要：Y2 Mo4 O15 particles were prepared using a simple solution method（SSM） and used as a highly efficient selective adsorbent for methylene blue（MB） in aqueous solutions. The maximum adsorption capacity of the samples was determined based on the adsorption isotherms with different adsorbent doses at 298,318 and 338 K. The fittings of the temperature-dependent isotherms yield ΔrGmθ =-34.1 kJ/mol,ΔrHmθ=-36.9 kJ/mol and ΔrSmθ=-9.67 J/mol·K. The as-prepared Y2 Mo4 O15 has a very large maximum adsorption capacity（i.e., 198 mg/g） for MB at room temperature, and this value is only less than that of amorphous hardwood powder. Notably, 80 mg of adsorbent is able to completely decolorize 250 mL of30 mg/L MB aqueous solution. The kinetic parameters of the adsorption process were obtained from the temperature-dependent adsorption isotherm（i.e., E1=26.9 kJ/mol and E1 = 63.8 kJ/mol）. The results of adsorption kinetics show that it is a pseudo-second-order reaction. The mechanism of the high selectivity and the large adsorption capacity is discussed based on competitive ion（CI） experiments and coordination theory.
Junhua You1，Renchao Wang2,3，Chaobin Liu2，Xiaojie Shi2，Fei Han2，Rui Guo2,3，Xuanwen Liu2,3
1. School of Materials Science and Engineering, Shenyang University of Technology2. School of Resources and Materials, Northeastern University at Qinhuangdao3. Key Laboratory of Nano-Materials and Photoelectric Catalysis of Qinhuangdao
摘 要：Y2 Mo4 O15 particles were prepared using a simple solution method（SSM） and used as a highly efficient selective adsorbent for methylene blue（MB） in aqueous solutions. The maximum adsorption capacity of the samples was determined based on the adsorption isotherms with different adsorbent doses at 298,318 and 338 K. The fittings of the temperature-dependent isotherms yield ΔrGmθ =-34.1 kJ/mol,ΔrHmθ=-36.9 kJ/mol and ΔrSmθ=-9.67 J/mol·K. The as-prepared Y2 Mo4 O15 has a very large maximum adsorption capacity（i.e., 198 mg/g） for MB at room temperature, and this value is only less than that of amorphous hardwood powder. Notably, 80 mg of adsorbent is able to completely decolorize 250 mL of30 mg/L MB aqueous solution. The kinetic parameters of the adsorption process were obtained from the temperature-dependent adsorption isotherm（i.e., E1=26.9 kJ/mol and E1 = 63.8 kJ/mol）. The results of adsorption kinetics show that it is a pseudo-second-order reaction. The mechanism of the high selectivity and the large adsorption capacity is discussed based on competitive ion（CI） experiments and coordination theory.
关键词：
