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Qian Liu,Bingchao Yang,Lujie Zhang,Ruihua Huang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
A multifunction adsorbent was synthesized by incorporating AC into CTS, and the ratio of AC to CTSwas 1/1. The resultant was called activated carbon (AC)/chitosan (CTS) composite. The simultaneous adsorption ofphenol and Cu2+from aqueous solution onto AC/CTS composite was investigated by a batch procedure. The adsorptionprocesses for both Cu2+and phenol obeyed the pseudo second-order kinetic model. Phenol was prone to be adsorbedmore quickly as compared with Cu2+when they coexisted in solution. The adsorption behavior of both phenol and Cu2+followed the Langmuir isotherm. The maximum adsorption capacities of phenol and Cu2+were 34.19 mg/g and 74.35mg/g at 293 K, respectively. No obvious competitive adsorption existed between phenol and Cu2+.
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Adsorptive removal of Cr(VI) from aqueous solutions by cross-linked chitosan/bentonite composite
Qian Liu,Bingchao Yang,Lujie Zhang,Ruihua Huang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7
Cross-linked chitosan/bentonite composite (CCB) was prepared, and characterized by Fourier transform infrared (FTIR) spectroscopy, BET surface area and pore diameter analyses, X-ray diffraction (XRD) patterns and thermal gravimetric analyses (TGA). The adsorption of hexavalent chromium Cr(VI) onto CCB as a function of adsorbent dosage, initial Cr(VI) concentration, solution pH, and contact time was investigated through batch experiments. The removal towards Cr(VI) decreased with increasing solution pH from 2 to 11 and initial Cr(VI) concentration, while it increased with increasing adsorbent dosage. The adsorption kinetic data of Cr(VI) on CCB were well described by the pseudo-second-order model. The equilibrium data were correlated by the Langmuir isotherm model. The maximum monolayer Cr(VI) adsorption capacity for CCB at pH 2 and 293 K was 89.13mg/g. The mechanisms for the adsorption of Cr(VI) on CCB at pH 2 may include electrostatic interaction and chemical interaction between CCB and Cr(VI) ions.
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Yanying Hou,Lujie Liu,Xingxing Zhang,Yuechao Zhu,Yongjun Qiu,Liming Zhao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Ion exchange resins are promising materials for separating chitooligosaccharides (COSs) with differentdegrees of polymerization (DP). The adsorbent functional groups significantly determine the interactionswith COSs and affect their adsorption and separation efficiency. This study investigated the adsorptionbehaviors of COSs on macroporous cation exchange resins with different functional groups to clarifythe functional group effect on the adsorption of COSs with different DP, which can also help to providea theoretical basis for the selection of separation medium and optimization of the separation technicsof COSs. The results showed that the adsorption of COSs on sulfonic-acid type resin DX-10 andcarboxylic-acid type resin DC-10 were favorable, and the adsorption isotherms were in accord withthe Sips model. Adsorption thermodynamics showed that temperature had opposite effects on the tworesins’ equilibrium adsorption capacity of COSs. The diffusion coefficient of COSs on DX-10 resin wasgreater, and the affinity gap between COSs on DX-10 resin was larger than that of DC-10 resin, whichis beneficial for improving the separation resolution of COSs. In contrast, the interaction energy betweenCOSs with high DP and DC-10 resin was weaker compared with DX-10, which made the elution of COSswith high DP easier.
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