title: Dual-porosity Mn2O3cubes for highly efficient dye adsorption.
abstract: Dual-porosity materials containing both macropores and mesopores are highly desired in many fields. In this work, we prepared dual-porosity Mn2O3cube materials with large-pore mesopores, in which, macropores are made by using carbon spheres as the hard templates, while the mesopores are produced via a template-free route. The attained dual-porosity Mn2O3materials have 24nm of large-pore mesopores and 700nm of macropores. Besides, the achieved materials own cubic morphologies with particle sizes as large as 6.0μm, making them separable in the solution by a facile natural sedimentation. Dye adsorption measurements reveal that the dual-porosity materials possess a very high maximum adsorption capacity of 125.6mg/g, much larger than many reported materials. Particularly, the adsorbents can be recycled and the dye removal efficiency can be well maintained at 98% after four cycles. Adsorption isotherm and kinetics show that the Langmuir model and the pseudo-second-order kinetics model can well describe the adsorption process of Congo Red on the dual-porosity Mn2O3cube materials. In brief, the reported dual-porosity Mn2O3demonstrates a good example for controlled preparation of dual-porosity materials with large-pore mesopores, and the macropore-mesopore dual-porosity distribution is good for mass transfer in dye adsorption application.
authors.affiliation: School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China; Key Laboratory of Low-grade Energy Utilization Technologies & Systems of the Ministry of Education, Chongqing University, Chongqing, 400044, China. Electronic address: 1207608675@qq.com.
authors.forename: Yongjiu
authors.initials: Y
authors.lastname: Shao
authors.affiliation: Institute of Energy Resources, Hebei Academy of Science, Shijiazhuang, Hebei Province, 050081, China; Hebei Engineer Research Center for Water Saving in Industry, Shijiazhuang, Hebei Province, 050081, China. Electronic address: renbints@126.com.
authors.forename: Bin
authors.initials: B
authors.lastname: Ren
authors.affiliation: School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China; Key Laboratory of Low-grade Energy Utilization Technologies & Systems of the Ministry of Education, Chongqing University, Chongqing, 400044, China. Electronic address: 398080723@qq.com.
authors.forename: Hanmei
authors.initials: H
authors.lastname: Jiang
authors.affiliation: School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China; Key Laboratory of Low-grade Energy Utilization Technologies & Systems of the Ministry of Education, Chongqing University, Chongqing, 400044, China. Electronic address: 617850544@qq.com.
authors.forename: Bingjie
authors.initials: B
authors.lastname: Zhou
authors.affiliation: School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China; Research Center for Environmental Monitoring, Hazard Prevention of Three Gorges Reservoir, Yangtze Normal University, Fuling, 408100, Chongqing, China. Electronic address: 785746671@qq.com.
authors.forename: Liping
authors.initials: L
authors.lastname: Lv
authors.affiliation: Department of Technology and Innovation, University of Southern Denmark, NielsBohrsAllé 1, 5230, Odense M, Denmark. Electronic address: renjingzheng123321@163.com.
authors.forename: Jingzheng
authors.initials: J
authors.lastname: Ren
authors.affiliation: School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China; Key Laboratory of Low-grade Energy Utilization Technologies & Systems of the Ministry of Education, Chongqing University, Chongqing, 400044, China. Electronic address: lcdong72@cqu.edu.cn.
authors.forename: Lichun
authors.initials: L
authors.lastname: Dong
authors.affiliation: School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China. Electronic address: lijing@cqu.edu.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute of Energy Resources, Hebei Academy of Science, Shijiazhuang, Hebei Province, 050081, China; Hebei Engineer Research Center for Water Saving in Industry, Shijiazhuang, Hebei Province, 050081, China. Electronic address: lzf63@sohu.com.
authors.forename: Zhenfa
authors.initials: Z
authors.lastname: Liu
keywords: Dual-porosity; Dye adsorption; Macropores; Mesopores; Mn(2)O(3)