Abstract
Herein active manganese dioxide was prepared by different methods using KMnO4 and MnSO4·H2O as inorganic precursors. The impact of preparation methods on morphology and adsorption performance of the synthesized products was investigated. The experimental results show that the reaction temperature and pressure had a great effect on the morphology and adsorption performance of active manganese dioxide. The shape of active manganese dioxide prepared at room temperature and pressure was short rod-like while active manganese dioxide synthesized by hydrothermal method was mesoporous fibers and had better adsorption performance. The adsorption behavior of 2,4-dinitrophenol on mesoporous manganese dioxide was well described by Langmuir and Freundlich isotherm equation ( R2>0.99) and pseudo-second-order kinetic equation ( R2>0.99), so the adsorption process maybe a chemical and monolayer adsorption. The pH of solution had significant effect on the adsorption performance of 2,4-dinitrophenol on mesoporous manganese dioxide. The adsorption capacity was 2.539 mg/g in the condition of pH = 7.
Highlights
IntroductionFor its well-known adsorption properties, catalytic activity and ion exchange ability capacity compared with other adsorbents, such as zeolite and activated carbon, has attracted more attention in environmental field application (Lisha et al, 2010; Liu et al, 2010)
Manganese dioxide, for its well-known adsorption properties, catalytic activity and ion exchange ability capacity compared with other adsorbents, such as zeolite and activated carbon, has attracted more attention in environmental field application (Lisha et al, 2010; Liu et al, 2010)
According to the ICDD, powder diffraction file (PDF) standard card, active manganese dioxide prepared at ambient pressure(sample 1) matches a typical X-ray diffraction (XRD) of d-MnO2, and active manganese dioxide prepared under hydrothermal conditions matches a typical XRD of a-MnO2
Summary
For its well-known adsorption properties, catalytic activity and ion exchange ability capacity compared with other adsorbents, such as zeolite and activated carbon, has attracted more attention in environmental field application (Lisha et al, 2010; Liu et al, 2010). Manganese dioxide has been widely researched as adsorbents and catalysts for environmental remediation purposes, such as organic dye (Ge and Qu, 2003), phenolic compounds (Wang et al, 2015; Zhang et al, 2011), heavy metal (Peng et al, 2015; Yu et al, 2015), humic acid (Davranche et al, 2008), and endocrine disrupting compounds (Rudder et al, 2004). It is still a great demand to investigate the relationship of preparation methods and adsorption properties of manganese oxide
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