Kai Gao
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Kai Gao has a total of 11 co-authors. Here are the top co-authors by number of shared publications:
Bo Zhang
Innovation Center of Nuclear Environmental Safety Technology, Southwest University of Science and Technology, Mianyang 621010, China, Mianyang, Sichuan, 621010, China
1 shared publicationCan Cui
Innovation Center of Nuclear Environmental Safety Technology, School of National Defense Science and Technology College, School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China, Mianyang, Sichuan, 621010, China
1 shared publication- Dongliang Zhang
School of Materials and Chemistry
1 shared publication Gangjian Li
Innovation Center of Nuclear Environmental Safety Technology, Southwest University of Science and Technology, Mianyang 621010, China, Mianyang, Sichuan, 621010, China
1 shared publication- Gaoling Liang
Innovation Center of Nuclear Environmental Safety Technology, Southwest University of Science and Technology, Mianyang 621010, China, Mianyang, Sichuan, 621010, China
1 shared publication - Mitang Wang
School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, China
1 shared publication
Latest Publications
- 10 April 2026
- Published by IOP Publishing in Nanotechnology
- Vol. 37 (15) , 155701
BiVO 4 @Ce–BDC–NH 2 nanocomposite based on VO 4 vacancy and heterostructures for electrochemical detection of metol
We develop a highly active electrocatalyst composite based on BiVO 4 @Ce–BDC–NH 2 (B(VO) 1−δ @CeBN) nanocomposite including VO 4 vacancies ((VO) 1− δ ) and heterojunction comprising bismuth vanadate (BiVO 4 ) and a cerium-based metal–organic framework (Ce–BDC–NH 2 ) for the ultrasensitive electrochemical detection of organic pollutant metol. The structural and compositional characteristics of B(VO) 1− δ @CeBN nanocomposite are analyzed by various microscopic and spectroscopic techniques, and confirmed that forming of the (VO) 1− δ defect and heterojunction structures. Furthermore, the B(VO) 1− δ @CeBN nanocomposite modified screen printed carbon electrode (B(VO) 1− δ @CeBN/SPCE) with exhibited enhanced electrochemical response toward metol including limit of detection of 1.15 nM in a broad linear range of 0.01–1000 µ M as well as a remarkable sensitivity of 0.2692 μ A · μ M −1 · cm −2 . This excellent detection sensitivity arises from the synergistic effect of heterojunction structures constructed between B(VO) 1− δ and Ce–BDC–NH 2 , while VO 4 vacancies defect enhances charge carrier concentration and conductivity. Additionally, B(VO) 1− δ @CeBN/SPCE sensor displays remarkable repeatability, reproducibility, stability, and selectivity toward metol detection. Finally, this work investigated the real-time practicability of metol over the B(VO) 1− δ @CeBN/SPCE electrode to detect spiked tape water, with good recovery ranges of 97.7%–98.6% achieved. These results highlight the potential of B(VO) 1− δ @CeBN/SPCE as a promising nanoplatform for trace-level detection of organic pollutants in environmental water bodies.
- 10 April 2026
- Published by IOP Publishing in Nanotechnology
- Vol. 37 (15) , 155701
BiVO 4 @Ce–BDC–NH 2 nanocomposite based on VO 4 vacancy and heterostructures for electrochemical detection of metol
We develop a highly active electrocatalyst composite based on BiVO 4 @Ce–BDC–NH 2 (B(VO) 1−δ @CeBN) nanocomposite including VO 4 vacancies ((VO) 1− δ ) and heterojunction comprising bismuth vanadate (BiVO 4 ) and a cerium-based metal–organic framework (Ce–BDC–NH 2 ) for the ultrasensitive electrochemical detection of organic pollutant metol. The structural and compositional characteristics of B(VO) 1− δ @CeBN nanocomposite are analyzed by various microscopic and spectroscopic techniques, and confirmed that forming of the (VO) 1− δ defect and heterojunction structures. Furthermore, the B(VO) 1− δ @CeBN nanocomposite modified screen printed carbon electrode (B(VO) 1− δ @CeBN/SPCE) with exhibited enhanced electrochemical response toward metol including limit of detection of 1.15 nM in a broad linear range of 0.01–1000 µ M as well as a remarkable sensitivity of 0.2692 μ A · μ M −1 · cm −2 . This excellent detection sensitivity arises from the synergistic effect of heterojunction structures constructed between B(VO) 1− δ and Ce–BDC–NH 2 , while VO 4 vacancies defect enhances charge carrier concentration and conductivity. Additionally, B(VO) 1− δ @CeBN/SPCE sensor displays remarkable repeatability, reproducibility, stability, and selectivity toward metol detection. Finally, this work investigated the real-time practicability of metol over the B(VO) 1− δ @CeBN/SPCE electrode to detect spiked tape water, with good recovery ranges of 97.7%–98.6% achieved. These results highlight the potential of B(VO) 1− δ @CeBN/SPCE as a promising nanoplatform for trace-level detection of organic pollutants in environmental water bodies.
- Open Access
Removal of Fluorine from RECl3 in Solution by Adsorption, Ion Exchange and Precipitation
In this paper, methods of effective removal of fluorine from rare earth chloride solution by adsorption, ion exchange and precipitation with lanthanum carbonate or CO2 gas as fluorine-removal agent, respectively, were studied. The relevant parameters studied for fluorine-removal percentage were the effects of the type and dosage of fluorine-removal agent, the injection flow and mode of CO2, the initial concentration of rare earth solution and initial pH value, contact time, temperature and stirring. XRD, SEM and EDS were used to analyze and characterize the filter slag obtained after fluorine removal. SEM and EDS results showed that RECO3(OH) with a porous structure was formed in rare earth chloride solution when lanthanum carbonate was used as fluorine-removal agent, and it had strong selective adsorption for F−. The XRD spectra showed that F− was removed in the form of REFCO3 precipitates, which indicates that the adsorbed F− replaced the OH− group on the surface of RECO3(OH) by ion exchange. The experimental results showed that a fluorine-removal percentage of 99.60% could be obtained under the following conditions: lanthanum carbonate dosage, 8%; initial conc. of rare earths, 240 g/L; initial pH, 1; reaction temperature, 90 C; reaction time, 2 h. Simultaneously, a fluorine-removal process by CO2 precipitation was explored. In general, RE2(CO3)3 precipitation is generated when CO2 is injected into a rare earth chloride solution. Interestingly, the results of XRD, SEM and EDS showed that the sedimentation slag was composed of REFCO3 and RE2O2CO3. It was inferred that RE2(CO3)3 obtained at the initial reaction stage had a certain adsorption effect on F− in the solution, and then F− replaced CO32− on the surface of RE2(CO3)3 by ion exchange. Therefore, F− was finally removed by the high crystallization of REFCO3 precipitation, and excess RE2(CO3)3 was aged to precipitate RE2O2CO3. The fluorine-removal percentage can reach 98.92% with CO2 precipitation under the following conditions: venturi jet; CO2 injection flow, 1000 L/h; reaction temperature, 70 C; initial pH, 1; reaction time, 1.5 h; initial conc. of rare earths, 240–300 g/L; without stirring. The above two methods achieve deep removal of fluorine in mixed fluorine-bearing rare earth chloride solution by exchanging different ionic groups. The negative influence of fluorine on subsequent rare earth extraction separation is eliminated. This technology is of great practical significance for the further development of the rare earth metallurgy industry and the protection of the environment.Open AccessRemoval of Fluorine from RECl3 in Solution by Adsorption, Ion Exchange and Precipitation
In this paper, methods of effective removal of fluorine from rare earth chloride solution by adsorption, ion exchange and precipitation with lanthanum carbonate or CO2 gas as fluorine-removal agent, respectively, were studied. The relevant parameters studied for fluorine-removal percentage were the effects of the type and dosage of fluorine-removal agent, the injection flow and mode of CO2, the initial concentration of rare earth solution and initial pH value, contact time, temperature and stirring. XRD, SEM and EDS were used to analyze and characterize the filter slag obtained after fluorine removal. SEM and EDS results showed that RECO3(OH) with a porous structure was formed in rare earth chloride solution when lanthanum carbonate was used as fluorine-removal agent, and it had strong selective adsorption for F−. The XRD spectra showed that F− was removed in the form of REFCO3 precipitates, which indicates that the adsorbed F− replaced the OH− group on the surface of RECO3(OH) by ion exchange. The experimental results showed that a fluorine-removal percentage of 99.60% could be obtained under the following conditions: lanthanum carbonate dosage, 8%; initial conc. of rare earths, 240 g/L; initial pH, 1; reaction temperature, 90 C; reaction time, 2 h. Simultaneously, a fluorine-removal process by CO2 precipitation was explored. In general, RE2(CO3)3 precipitation is generated when CO2 is injected into a rare earth chloride solution. Interestingly, the results of XRD, SEM and EDS showed that the sedimentation slag was composed of REFCO3 and RE2O2CO3. It was inferred that RE2(CO3)3 obtained at the initial reaction stage had a certain adsorption effect on F− in the solution, and then F− replaced CO32− on the surface of RE2(CO3)3 by ion exchange. Therefore, F− was finally removed by the high crystallization of REFCO3 precipitation, and excess RE2(CO3)3 was aged to precipitate RE2O2CO3. The fluorine-removal percentage can reach 98.92% with CO2 precipitation under the following conditions: venturi jet; CO2 injection flow, 1000 L/h; reaction temperature, 70 C; initial pH, 1; reaction time, 1.5 h; initial conc. of rare earths, 240–300 g/L; without stirring. The above two methods achieve deep removal of fluorine in mixed fluorine-bearing rare earth chloride solution by exchanging different ionic groups. The negative influence of fluorine on subsequent rare earth extraction separation is eliminated. This technology is of great practical significance for the further development of the rare earth metallurgy industry and the protection of the environment.