Preparation of Bentonite/Chitosan Composite for Bleaching of Deteriorating Transformer Oil

Polymers

卷:12

Wei Li¹  Kewang Zheng¹  Hujian Chen¹  Caiqin Qin¹  Aohui Zhu¹  Zhifei Meng¹ 

[1] School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China;

关键词: chitosan;    bentonite;    calcination;    bleaching;    transformer oil;   

DOI  :  10.3390/polym12010060

来源: DOAJ

【 摘 要 】

A novel adsorbent containing chitosan (CS) and bentonite (BT) was developed by mixing, drying, and calcining, and used as an adsorbent for the efficient bleaching of deteriorating transformer oil. The effects of calcination temperature, dosage of CS, adsorbent content, adsorption temperature, and adsorption time on the bleaching capacity of transformer oil were investigated. The structure of the adsorbent was also investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), and N₂ adsorption-desorption isotherm techniques. The results showed that there was only physical interaction between CS and BT; CS did transform to carbon (C) and covered the surface of BT. The specific surface area and micropore volume of the adsorbent were affected by the calcination process. The composite adsorbent offered an excellent bleaching performance. When the calcination temperature was 300 °C and dosage of CS was 5%, the composite adsorbent had the optimum bleaching properties. When the composite adsorbent content was 4%, the adsorption temperature was 50 °C and the adsorption time was 75 min, the colour number and transmittance of the deteriorating transformer oil decreased from no. 10 to no. 1 and increased from 70.1% to 99.5%, respectively.

【 授权许可】

Unknown