• 文献标题:   Thermodynamic and kinetic studies of crystal violet dye adsorption with poly(methyl methacrylate)-graphene oxide and poly(methyl methacrylate)-graphene oxide-zinc oxide nanocomposites
  • 文献类型:   Article
  • 作  者:   RAJABI M, MAHANPOOR K, MORADI O
  • 作者关键词:   adsorption, application, dye, pigment
  • 出版物名称:   JOURNAL OF APPLIED POLYMER SCIENCE
  • ISSN:   0021-8995 EI 1097-4628
  • 通讯作者地址:   Islamic Azad Univ
  • 被引频次:   10
  • DOI:   10.1002/app.47495
  • 出版年:   2019

▎ 摘  要

We successfully prepared poly(methyl methacrylate) (PMMA)-graphene oxide (GO) and PMMA-GO-zinc oxide (ZnO) nanocomposites and characterized them using different techniques. The adsorption performances of the as-prepared composites were investigated for crystal violet (CV) dye removal. The contact time as a main factor affecting the adsorption process by adsorbents was studied. Because the adsorption capacity value for CV was found to show no extensive changes after 35 min, 35min was selected as the best contact time for our system. The adsorption results revealed that the best capacity of CV adsorption onto the PMMA-GO and PMMA-GO-ZnO nanocomposites occurred at pH12 and 298K. The respective entropies (-0.208 and -0.168 kJ mol(-1) K-1) and enthalpies (-72.86 kJ/mol, and -55.54 kJ/mol) for PMMA-GO and PMMA-GO-ZnO and Gibbs energy revealed that the process of adsorption was exothermic. In addition, the Elovich, pseudo-first-order, intraparticle diffusion, and pseudo-second-order (four types) models were applied to our kinetic study. Our results indicate that CV adsorption onto PMMA-GO and PMMA-GO-ZnO was good with the pseudo-second-order (type 1) and pseudo-first-order models because of the low (2) value and the high correlation coefficient value. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47495.