• 文献标题:   Enhanced adsorption-coupled reduction of hexavalent chromium by 2D poly(m-phenylenediamine)-functionalized reduction graphene oxide
  • 文献类型:   Article
  • 作  者:   JIN LF, CHAI LY, REN LL, JIANG YX, YANG WC, WANG S, LIAO Q, WANG HY, ZHANG LY
  • 作者关键词:   poly mphenylenediamine, reduction graphene oxide, composite, hexavalent chromium, reduction, removal
  • 出版物名称:   ENVIRONMENTAL SCIENCE POLLUTION RESEARCH
  • ISSN:   0944-1344 EI 1614-7499
  • 通讯作者地址:   Cent S Univ
  • 被引频次:   6
  • DOI:   10.1007/s11356-019-06175-x
  • 出版年:   2019

▎ 摘  要

To improve the mass transfer efficiency of poly(m-phenylenediamine) for the effective removal of hexavalent chromium (Cr (VI)) from aqueous solution, a facile and one-step method to prepare two-dimensional poly(m-phenylenediamine) functionalized reduction graphene oxide (rGO-PmPD) by dilution polymerization is developed. The structure and morphology of rGO-PmPD as well as rGO and PmPD were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET), Fourier-transformed infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), Raman, and X-ray diffraction (XRD). The preparation mechanism, adsorption performance, and mechanism of rGO-PmPD were then investigated in detail. The obtained rGO-PmPD exhibited thin 2D nanosheet morphology with much improved specific surface area and pore volume (18 and 25 times higher than that of PmPD, respectively). The Cr (VI) adsorption of rGO-PmPD was fitted well with the pseudo-second-order kinetic model and Langmuir isotherm model, and the maximum adsorption capacity of rGO-PmPD reached 588.26 mg g(-1), higher than that of PmPD (400 mg g(-1)) and rGO (156.25 mg g(-1)). Moreover, the regeneration efficiency of the rGO-PmPD nanosheet is also promising that the adsorption performance after five times of adsorption-desorption cycles still maintains more than 530 mg g(-1). The removal mechanism involved reduction coupled with adsorption and electrostatic interaction between rGO-PmPD and Cr (VI), and similar to 65% of Cr (VI) removal was attributed to reduction and similar to 35% was ascribed to adsorption and electrostatic interaction. This study thus provides a simple and effective route to achieve high accessible surface area of adsorbent materials with enhanced mass transfer efficiency and thereafter improved adsorption performance.