期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 210, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfb.2021.112216
关键词
Interface assembly; Activated collagen fiber; Catechin; Iodine capture; Specific recognition
资金
- National Natural Science Foundation of China [21406182]
- State Administration for Science Technology and Industry for National Defence Supporting Project of Spent Fuel Reprocessing [KY20007]
- Science and Technology Project of Sichuan Province [19YYJC1690]
- Science and Technology Department of Sichuan Province [2021JDTD0019]
- Longshan Academic Talents Supporting Project of Southwest University of Science and Technology [17LZX202, 17LZX622, 18LZX604]
In this paper, a new adsorbent Catechin@ACF was successfully prepared, which showed specific recognition and capture characteristics for iodine. The aromatic rings, phenolic hydroxyl groups and imine groups in the catechin membrane were identified as key structures for iodine capture. The as-prepared adsorbent exhibited excellent capture capacity and is expected to play a vital role in spent fuel treatment.
Efficient capture of radioactive iodine (I-129, I-131) is of great significance in spent fuel treatment. In this paper, a new adsorbent named Catechin@ACF was successfully prepared through interface assembly of specific recognition gripper with plant polyphenols (catechin) on activated collagen fiber (ACF), and the catechin membrane with specific grip on iodine was successfully constructed on the surface of ACF. The results showed that the adsorbent assembled catechin membrane was rich in aromatic rings, hydroxyl groups and imine adsorption sites, and possessed specific recognition and capture characteristics of iodine. Moreover, the as-prepared Catechin@ACF showed excellent capture capacity for iodine vapor and iodine in organic solution with the maximum capture capacity of 2122.68 mg/g and 258.29 mg/g, respectively. In iodine-cyclohexane solution, the adsorption process was in according with the Pseudo first order kinetic and Langmuir isothermal model. In addition, the specific recognition and capture mechanism analysis indicated that the aromatic rings, phenolic hydroxyl groups and imine groups in the catechin membrane were the specific and effective grippers for iodine, and finally iodine formed a stable conjugated system with the adsorbent in the form of I- and I-3(-). Therefore, the as-prepared specific iodine capturer Catechin@ACF was expected to play a vital role in the capture of radioactive iodine in spent fuel off-gas because of its specific recognition, high capture capacity, large-scale preparation, and environment-friendly.
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