LIANG Xingtang, ZHONG Shuming, LIU Zijie, et al. Chitin/polyethyleneimine composite as an adsorbent of aqueous Cr (Ⅵ)[J]. CIESC Journal, 2018, (5): 2255-2262.
LIANG Xingtang, ZHONG Shuming, LIU Zijie, et al. Chitin/polyethyleneimine composite as an adsorbent of aqueous Cr (Ⅵ)[J]. CIESC Journal, 2018, (5): 2255-2262.DOI: 10.11949/j.issn.0438-1157.20171276.
The polyethyleneimine (PEI) was homogeneously grafted onto the chitin (CT) with aid of epichlorohydrin to produce CT-based biosorbents (CTP) for removal of Cr(Ⅵ) from water. The structure and morphology of CTP were characterized by FT-IR
XRD
SEM
EDS and Zeta potential. The effects of pH value
contact time
initial Cr(Ⅵ) concentration
treatment temperature and coexisting ions on the Cr(Ⅵ) adsorption were investigated. The results showed that the CTP with a mass ratio of PEI:CT=4:1 (CTP4) presented a maximum adsorption capacity of 330.4 mg·g-1 according to the Langmuir isotherm at 25℃ and pH value 2.0. The adsorption was a spontaneous and endothermal process
which achieved the equilibrium within 60 min and followed the pseudo-second-order kinetic model. After six cycles of adsorption-desorption
the CTP4 remained 89.5% of its original adsorption capacity