Study on the preparation and adsorption thermodynamics of chitosan microsphere resins

doi:10.1007/s11458-009-0029-4

Front Chem Chin

2009, Vol. 4

Issue (2) : 160-167 https://doi.org/10.1007/s11458-009-0029-4

RESEARCH ARTICLE

Study on the preparation and adsorption thermodynamics of chitosan microsphere resins

Lina YU^1,2, Dongfeng WANG¹(

), Weisheng HU¹, Haiyan LI¹, Minmin TANG¹

1. College of Food Science and Technology, Ocean University of China, Qingdao 266003, China; 2. Shandong Peanut Research Institute, Qingdao 266100, China

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Abstract

The aim of this research is to study the thermodynamic behavior of resins of chitosan microspheres (RCM) in adsorbing Cu²⁺, so that the theoretical basis of the application of RCM to eliminate metal ions in wastewater or fruit and vegetable juice can be obtained. First, RCM were prepared from chitosan as a raw material by using reverse phase suspension cross-linking polymerization, and some physicochemical properties of RCM were characterized. Second, the adsorption behavior of Cu²⁺ onto RCM was investigated by the batch method. The results show that the diameter of the microspheres was relatively uniform and the surface of microspheres was compacted with pores. The physical properties of the RCM were as follows: water content 51.982%, skeletal density 1.212 g?cm^-³, pileup density 0.862 g?mL^-¹, porosity was in 0.554 and crosslinking degree was in 13.581%. The saturated adsorption capacity of RCM for Cu²⁺ was 0.993 mmol?g^-¹. At the same time, the results also indicated that the adsorption of RCM for Cu²⁺ followed the Langmuir isotherm equation: C_e/Q=11.614+ 1.0075C_e at 313 K and the adsorption appeared to be of the monomolecular type. The adsorption was found through thermodynamic study to be a spontaneous endothermic process of increased entropy. The adsorption potential decreased gradually as Cu²⁺ concentration increased at the same temperature and it increased as temperature increased at the same initial concentration of Cu²⁺.

Keywords resins of chitosan microspheres adsorption Cu²⁺ isothermal curve thermodynamics

Corresponding Author(s): WANG Dongfeng,Email:wangdf@ouc.edu.cn

Issue Date: 05 June 2009

Cite this article:

Lina YU,Dongfeng WANG,Weisheng HU, et al. Study on the preparation and adsorption thermodynamics of chitosan microsphere resins[J]. Front Chem Chin, 2009, 4(2): 160-167.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-009-0029-4
https://academic.hep.com.cn/fcc/EN/Y2009/V4/I2/160

Fig.1 SEM picture of RCM

Tab.1 Physical properties of RCM

Fig.2 FTIR spectra of chitosan powder (1) and RCM (2)

Fig.3 XRD spectra of chitosan powder (1) and RCM (2)

Fig.4 DSC spectra of chitosan powder (1) and RCM (2)

Fig.5 Working curve of CuSO

Fig.6 Adsorption isotherms of Cu onto RCM

Fig.7 Langmuir isotherms adsorption model for Cu onto RCM at different temperatures

Tab.2 Langmuir isotherm parameters for Cu with RCM

Fig.8 Determination of enthalpy of adsorption for Cu with RCM

Tab.3 Thermodynamic properties of the Cu onto RCM

Tab.4 Adsorption potentials of Cu onto RCM

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