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| Effect of N-F doping ratio on terramycin adsorption performance of TiO2/bentonite composites |
| Received:September 12, 2019 |
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| KeyWord:co-doping;titanium dioxide;bentonite;terramycin;adsorption |
| Author Name | Affiliation | E-mail | | WANG Teng | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | LU Hao-yuan | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHANG Meng-fei | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | BU Shuai-bin | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | REN Shuang | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | SHENG Li | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
College of Chemical Engineering, Qinghai University, Xining 810016, China | | | MENG Zhao-fu | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Lab of Nutrition and Agroenvironment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | zfmeng@hotmail.com |
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| Abstract: |
| To elucidate the effect of doping ratio on adsorption performance of TiO2/bentonite composites, a series of nitrogen-fluoride codoped TiO2/bentonite composites were prepared via the sol-gel method. The prepared composites were characterized by specific surface area (SBET)and cation exchange capacity(CEC)analyses and scanning electron microscopy. The effect of doping ratios of N and F on terramycin adsorption was investigated through batch experiments. The results showed that N-F co-doped TiO2 was successfully adhered on the surface of bentonite. With an increase in N doping ratio in the N-doped TiO2/bentonite composites, the coverage degree of N-doped TiO2, SBET, and pore volume of the composites increased, while the CEC and average pore width of the composites decreased by 36.24% and 1.74%, respectively. Moreover, the particle size of N-doped TiO2 decreased from 50~100 nm to 25~50 nm. When TiO2 was doped with N and F, the SBET, pore width, pore volume, and CEC of the N-F co-doped TiO2/bentonite composites were higher than those of the N-doped TiO2/bentonite composites. Compared with the undoped samples, N-doped TiO2 caused a decrease in terramycin adsorption(14.30 mmol· kg-1 on an average); however, N-F co-doped TiO2 increased terramycin adsorption from 37.98 mmol·kg-1 and 40.90 mmol·kg-1 to 42.95 mmol·kg-1 and 43.73 mmol·kg-1 when the N doping ratio of TiO2 was 0.5 and 1, respectively. The results demonstrated that the high adsorption of the N-F co-doped TiO2/bentonite composites to terramycin can be attributed to the increase in negative charge, pore diameter, and pore volume of the composites due to F doping. |
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