Synthesis and Adsorption Performance of Ag/γ-Al2O3 with High Adsorption Capacities for Dibenzyl Disulfide

被引：9
作者：
Qian, Yihua [1 ]
Wu, Jian [2 ]
Lv, Daofei [2 ]
Xu, Chanchan [3 ]
Wu, Jing [1 ]
Zhao, Yaohong [1 ]
Xia, Qibin [2 ]
机构：
[1] Guangdong Power Grid Co Ltd, Elect Power Res Inst, Guangzhou 510080, Peoples R China
[2] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510641, Guangdong, Peoples R China
[3] Shenzhen Polytech, State Owned Assets Management Off, Shenzhen 518055, Peoples R China
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2020年 / 59卷 / 13期
关键词：
INSULATING MINERAL-OIL; CORROSIVE SULFUR; ACTIVATED CARBON; TRANSFORMER OIL; METAL-IONS; REMOVAL; COPPER; ADSORBENT; MECHANISM; DESULFURIZATION;
D O I：
10.1021/acs.iecr.0c00019
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The removal of dibenzyl disulfide (DBDS) from transformer oils is vital to the sustainable operation of transformers. Here, Ag/gamma-Al2O3 samples were prepared by a planetary mixer-assisted impregnation method and characterized. The effect of adsorption time and temperature on the equilibrium adsorption of DBDS onto Ag/gamma-Al2O3 was discussed. The kinetics and isotherms of DBDS adsorption on the samples were studied. The desorption activation energy of DBDS was also estimated through temperature-programmed desorption (TPD) experiments. Results indicated that the DBDS adsorption capacities on Ag/gamma-Al2O3 increased quickly within the first 3 h, and the highest DBDS adsorption capacity was 69.5 mg/g, which was 232, 107, and 5.6 times higher than that of active bentonite, gamma-Al2O3, and active carbon, respectively. The adsorption isotherms were well fitted by the Langmuir model, and the adsorption kinetics followed the pseudo-second-order model. The desorption activation energy of DBDS on Ag/gamma-Al2O3 was much higher than that on active carbon, indicating a strong interaction between DBDS and Ag/gamma-Al2O3. Finally, the hard-soft acid-base (HSAB) principle was used to explain the adsorption mechanism, confirming that DBDS as a soft base can be preferentially adsorbed by Ag/gamma-Al2O3 because Ag+ is a soft acid.
引用
收藏
页码：6164 / 6171
页数：8
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