title: MnO(x)-modified ZnAl-LDOs as high-performance adsorbent for the removal of methyl orange.
abstract: MnO(x) modified ZnAl layered double oxides (M-LDO) nanocomposites were prepared through an intercalation/reduction/calcination process. The morphology and crystal structure of M-LDO were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) analysis methods. The results confirmed that the manganese oxide nanoparticles were well distributed on the LDO support. Methyl orange (MO) was chosen as a common water-soluble azo dye probe to evaluate the adsorption performance of M-LDO. The effects of MO initial concentration, agitation time, and temperature on MO adsorption were investigated. It was found that adsorption equilibrium data were best represented by the Langmuir and Redlich-Peterson isotherms and the maximum adsorption capacity was 617.28 mg g(-1) obtained from the Langmuir isotherm, which was much larger than some reported adsorbents. Besides, the adsorption process was spontaneous and endothermic in nature and followed a pseudo-second-order kinetic model. The mechanism of the adsorption process was elaborated by an intraparticle diffusion model. Moreover, the regeneration test of M-LDO was carried out and it showed that the used M-LDO was feasible for at least five times. In principle, this adsorbent with a high adsorption capacity and great reutilization performance could be a very promising adsorbent for wastewater treatment.
authors.affiliation: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China. zhangyuxin@cqu.edu.cn.
authors.forename: Yu Xin
authors.initials: YX
authors.lastname: Zhang
authors.forename: Xiao Dong
authors.initials: XD
authors.lastname: Hao
authors.forename: Tian
authors.initials: T
authors.lastname: Wang
authors.forename: Yu Xin
authors.initials: YX
authors.lastname: Meng
authors.forename: Xu
authors.initials: X
authors.lastname: Han
mesh_terms: D000327:Adsorption; D017607:Aluminum Compounds / Q000737:chemistry*; D001391:Azo Compounds / Q000302:isolation & purification*; D017895:Manganese Compounds / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D001391:Azo Compounds; D017895:Manganese Compounds; D009566:Nitrates; D010087:Oxides; D017967:Zinc Compounds; C100258:methyl orange; C042103:zinc nitrate; C050609:aluminum nitrate