Open AccessEthylenediamine grafted to graphene oxide@Fe3O4 for chromium(VI) decontamination: Performance, modelling, and fractional factorial design
Author(s) -
Xinjiang Hu,
Jieping Xu,
Cuiyu Wu,
Jianbin Deng,
Wenwei Liao,
Yuxiang Ling,
Yuanxiu Yang,
Yong Zhao,
Yunlin Zhao,
Xi Hu,
Hui Wang,
Yunguo Liu
Publication year - 2017
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0187166
Subject(s) - human decontamination , adsorption , factorial experiment , ethylenediamine , chemistry , freundlich equation , nuclear chemistry , fractional factorial design , chromium , oxide , sorbent , response surface methodology , central composite design , langmuir adsorption model , inorganic chemistry , chromatography , waste management , mathematics , organic chemistry , statistics , engineering
A method for grafting ethylenediamine to a magnetic graphene oxide composite (EDA-GO@Fe 3 O 4 ) was developed for Cr(VI) decontamination. The physicochemical properties of EDA-GO@Fe 3 O 4 were characterized using HRTEM, EDS, FT-IR, TG-DSC, and XPS. The effects of pH, sorbent dose, foreign anions, time, Cr(VI) concentration, and temperature on decontamination process were studied. The solution pH can largely affect the decontamination process. The pseudo-second-order model is suitable for being applied to fit the adsorption processes of Cr(VI) with GO@Fe 3 O 4 and EDA-GO@Fe 3 O 4 . The intra-particle diffusion is not the rate-controlling step. Isotherm experimental data can be described using the Freundlich model. The effects of multiple factors on the Cr(VI) decontamination was investigated by a 2 5−1 fractional factorial design (FFD). The adsorption process can significantly be affected by the main effects of A (pH), B (Cr(VI) concentration), and E (Adsorbent dose). The combined factors of AB (pH × Cr(VI) concentration), AE (pH × Adsorbent dose), and BC (Cr(VI) concentration × Temperature) had larger effects than other factors on Cr(VI) removal. These results indicated that EDA-GO@Fe 3 O 4 is a potential and suitable candidate for treatment of heavy metal wastewater.