Ming-Hua Zeng

Publications (3)8.02 Total impact

• Article: Chemical modification of chitosan by tetraethylenepentamine and adsorption study for anionic dye removal.

  Xiao-Yi Huang, Xiao-Yun Mao, Huai-Tian Bu, Xiao-Yuan Yu, Gang-Biao Jiang, Ming-Hua Zeng
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  ABSTRACT: To utilize the contribution of introduced amino groups to the adsorption of an anionic dye (eosin Y), a batch adsorption system was applied to study the adsorption of eosin Y from aqueous solution by tetraethylenepentamine (TEPA) modified chitosan (TEPA-CS). Experiments were carried out as a function of particle size, initial pH, agitation rate, adsorbent dosage, agitation period, temperature and initial concentration of eosin Y. The Langmuir and Freundlich models were used to fit the adsorption isotherms. From the values of correlation coefficients (R2), it was observed that the experimental data fit very well to the Langmuir model, giving a maximum sorption capacity of 292.4mg/g at 298K. Kinetic studies showed that the kinetic data were well described by the pseudo-second-order kinetic model. The thermodynamic study revealed negative value of enthalpy change (ΔH°) and free energy change (ΔG°), indicating spontaneous and endothermic nature of the adsorption of eosin Y on to TEPA-CS.
  Carbohydrate research 07/2011; 346(10):1232-40. · 2.03 Impact Factor
• Article: Cross-linked succinyl chitosan as an adsorbent for the removal of Methylene Blue from aqueous solution.

  Xiao-Yi Huang, Huai-Tian Bu, Gang-Biao Jiang, Ming-Hua Zeng
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  ABSTRACT: Removal of a basic dye (Methylene Blue) from aqueous solution was investigated using a cross-linked succinyl-chitosan (SCCS) as sorbent. The chemical structures of chitosan and its derivatives were testified by FT-IR. X-ray diffraction, DTG analysis and swelling measurements were conducted to clarify the characteristics of the chemically modified chitosan. The effect of process parameters, such as pH of the initial solution, and concentrations of dyes on the extent of Methylene Blue (MB) adsorption was investigated. The Langmuir isotherm model was used to fit the equilibrium experimental data, giving a maximum sorption capacity of 289.02 mg/g at 298 K. Kinetic studies showed that the kinetic data were well described by the pseudo-second-order kinetic model. Thermodynamic parameters such as enthalpy change (ΔH°), free energy change (ΔG°) and entropy change (ΔS°) were determined to be -25.32 kJmol(-1), -6.76 kJmol(-1) and -62.36 Jmol(-1) K(-1), respectively, which leads to a conclusion that the adsorption process is spontaneous and exothermic.
  International journal of biological macromolecules 06/2011; 49(4):643-51. · 2.37 Impact Factor
• Article: Removal of anionic dye eosin Y from aqueous solution using ethylenediamine modified chitosan

  Xiao-Yi Huang, Jian-Ping Bin, Huai-Tian Bu, Gang-Biao Jiang, Ming-Hua Zeng
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  ABSTRACT: In this study, chitosan was cross-linked with ethylenediamine (EDA) to prepare an outstanding sorbent for the removal of anionic dye eosin Y from aqueous solution. FTIR, DTG, XPS and zeta potential analysis were used to characterize the sorbent. The effect of particle size, solution pH, agitation rate, temperature, adsorbent dosage (50–500 mg/L), contact time (10 min–24 h) and initial concentration of dye (50–300 mg/L) on the adsorption process was investigated. Langmuir and Freundlich adsorption models were applied to describe the isotherms and isotherm constants, and the data fitted well with Langmuir model with a maximum adsorption capacity of 294.12 mg/g at 25 °C. Kinetic studies followed the pseudo second-order rate model, which indicated that the chemisorption is the rate-limiting step. Thermodynamic parameters such as enthalpy change (ΔH° = −5.004 kJ/mol), free energy change (ΔG° < 0) and entropy change (ΔS° = −11.656 J/(mol K)) indicate the exothermic and spontaneous nature of adsorption.
  Carbohydrate Polymers 84(4):1350-1356. · 3.63 Impact Factor