1
|
The dependence of Cu 2O morphology on different surfactants and its application for non-enzymatic glucose detection. Colloids Surf B Biointerfaces 2021; 208:112087. [PMID: 34500204 DOI: 10.1016/j.colsurfb.2021.112087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 08/24/2021] [Accepted: 08/27/2021] [Indexed: 01/17/2023]
Abstract
Herein, the Cu2O yolk-shell nanospheres, nanocubes and microcubes were successfully prepared by a simple seed-medium process. The formation of the Cu2O yolk-shell nanospheres can be attributed to the self-assembly process caused by the introduction of the seed medium. The formation mechanism of our obtained Cu2O yolk-shell nanospheres and the dependence of Cu2O morphology on different surfactants have been studied. The obtained samples were applied in the field of non-enzymatic glucose detection. The electrochemical response characteristics of the modified electrodes toward glucose were investigated by cyclic voltammetry (CV) and chronoamperometry (CA). The electrode modified with C-Cu2O (obtained by using CTAB as surfactant) shared the highest sensitivity of 3123 μAmM-1 cm-2, whereas, the electrode modified with S-Cu2O (obtained by using SDBS as surfactant) exhibited the lowest LOD of 0.87 μM and the widest linear range of 0.05-10.65 mM. All obtained sensors showed fast response to the addition of glucose. The obtained electrodes showed better responses to glucose than other coexisting interferences, indicating that the obtained electrodes had the acceptable selectivity to glucose. In addition, the stability for 5 consecutive weeks had also been studied and exhibited satisfactory results. The obtained electrode was also used to detect the glucose content in real serum. The acceptable selectivity, stability together with the excellent sensing ability in real serum make the obtained electrodes a potential for practical applications.
Collapse
|
2
|
Tetracycline Photocatalytic Degradation under CdS Treatment. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2020. [DOI: 10.3390/jmse8070483] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Industrialization and the growing consumption of medicines leads to global aquatic contamination. One of the antibiotics widely used against bacterial infections in both human and veterinary medicine is tetracycline. Despite its positive antibiotic action, tetracycline is resistant against degradation, and therefore it accumulates in the environment, including the aquatic environment, creating great health hazards, possibly stimulating antibiotic resistance of pathogenic organisms. In this research, aqueous suspensions of semiconductor nanoparticles CdS were used for photocatalytic activity studies in the presence of methylene blue as a model compound, and finally, in the presence of tetracycline, a broad-spectrum antibiotic widely used against bacterial infections, as well as a live-stock food additive. The mechanism and kinetic rate constants of photocatalytic degradation processes of methylene blue and tetracycline were described in correlation with the energy diagram of CdS nanoparticles.
Collapse
|
3
|
Liu F, Che Y, Chai Q, Zhao M, Lv Y, Sun H, Wang Y, Sun J, Zhao C. Construction of rGO wrapping Cu 2O/ZnO heterostructure photocatalyst for PNP and PAM degradation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:25286-25300. [PMID: 31256404 DOI: 10.1007/s11356-019-05814-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 06/20/2019] [Indexed: 05/27/2023]
Abstract
Copper and zinc composite oxides (Cu2O/ZnO) were synthesized by an impregnation-reduction-air oxidation method. A series of Cu2O/ZnO/rGO ternary composites were prepared by coupling with graphene oxide (GO) with different mass fractions in a solvothermal reaction system. The microscopic morphology, crystal structure, and optical characteristics of the photocatalysts were characterized. The degradation of p-Nitrophenol (PNP) and polyacrylamide (PAM) by photocatalytic materials under simulated solar irradiation were studied, and the degradation kinetics were also investigated. The results showed that cubic Cu2O was modified by ZnO nanorods and distributed on rGO nanosheets. The ternary Cu2O/ZnO/rGO nanocomposites have stronger simulated solar absorption ability and higher photodegradation efficiency than pure ZnO and binary Cu2O/ZnO nanocomposites. When the amount of Cu2O/ZnO/rGO-10 was 0.3 g L-1, the degradation rate of 10 mg L-1 PNP reached 98% at 90 min and 99.6% of 100 mg L-1 PAM at 30 min. The photocatalytic degradation processes of PNP and PAM all followed the pseudo-first-order kinetic model. Free radical trapping experiments showed that superoxide radicals were the main active substances to improve photocatalytic efficiency. In addition, after four recycles, the catalytic efficiency of Cu2O/ZnO/rGO-10 was still over 90%. It showed that Cu2O/ZnO/rGO-10 was a promising catalyst for wastewater treatment because of its good photostability and reusability.
Collapse
Affiliation(s)
- Fang Liu
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China.
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, People's Republic of China.
| | - Yangli Che
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China
| | - Qingwen Chai
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China
| | - Mengfei Zhao
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China
| | - Yan Lv
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China
| | - Hui Sun
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China
| | - Yongqiang Wang
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China.
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, People's Republic of China.
| | - Juan Sun
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China
| | - Chaocheng Zhao
- College of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China
| |
Collapse
|