Enhanced photocatalytic performance for oxidation of glucose to value-added organic acids in water using iron thioporphyrazine modified SnO<sub>2</sub>

Yang

ACS Sustainable Chem. Eng.

et al. 2021

Self Cite

There is increasing interest in the production of value-added chemicals by oxidizing glucose with the aid of photocatalysis in an aqueous medium. Herein, a new SnO2-OVs/CoPz composite was prepared through cobalt tetra(2,3-bis(butylthio)maleonitrile)porphyrazine (CoPz) supported on SnO2 with oxygen vacancies (SnO2-OVs), and the as-prepared SnO2-OVs/CoPz composite exhibited strong visible-light absorption and excellent charge separation efficiency. The SnO2-OVs/CoPz composite possessed a stronger adsorption ability toward glucose, while the composite possessed a moderate adsorption ability toward organic acid. Therefore, the SnO2-OVs/CoPz composite showed excellent photocatalytic activity for oxidizing glucose to organic acid in an aqueous medium, using atmospheric dioxygen as an oxidant under simulated sunlight irradiation. Various kinds of organic acids including glucaric acid, gluconic acid, and formic acid were acquired through this composite photocatalytic system. The synergy of SnO2-OVs and CoPz accelerated the glucose oxidation. The total selectivity toward the above three organic acids can reach up to 81.5% at 43.6% glucose conversion after reacting for 3 h under optimal conditions, especially 28.5% selectivity toward glucaric acid was acquired in an aqueous medium. The effects of various active species on glucose oxidation were further revealed by scavenger experiments and ESR detections. This work provides a strategy to fabricate new photocatalysts for efficient organic transformation.

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cobalt Porphyrazine Supported on SnO₂ with Oxygen Vacancies for Boosting Photocatalytic Aerobic Oxidation of Glucose to Organic Acids in an Aqueous Medium

Yang

ACS Sustainable Chem. Eng.

et al. 2021

Self Cite

“…As the peak position of Pd is close to that of Au and Co, and the characteristic peak intensity of Co is high, the characteristic peak of Pd is not obvious in the XRD pattern. Raman spectra (Figure 7b) showed that the D‐band peak at 1339 cm −1 and the G‐band peak at 1581 cm −1 , which also confirmed the formation of graphitized carbon [40,41] . The I D /I G ratio indicates the defect density of carbon crystal, with the increase of calcination temperature, the degree of graphitized carbon increases.…”

Section: Resultsmentioning

confidence: 70%

Pickering High Internal Phase Emulsions Templated CoOx−HPC Loading Bimetallic AuPd Nanoparticles for Catalytic Oxidation of 5‐Hydroxymethylfurfural to 2, 5‐Furan Dicarboxylic

Guan

Chen

et al. 2022

ChemistrySelect

The supported bimetallic AuPd nanoparticles hold great promise for the selective oxidation of 5‐hydroxymethylfurfural (HMF) to 2, 5‐furan dicarboxylic acid (FDCA), a substitute for petroleum derivative terephthalic acid (TPA). Herein, by combining a versatile Pickering high internal phase emulsions (HIPEs) template with subsequent carbonization process, cobalt‐based hierarchical porous carbon (CoOx−HPC) support was obtained. After loading bimetallic AuPd nanoparticles through the sol‐gel method, AuPd/CoOx−HPC catalyst was successfully synthesized. By changing the Pickering HIPEs parameters, carbonization temperature, the porous structure and cobalt valence of as‐synthesized catalyst can be adjusted. The obtained catalysts were systematically characterized by SEM, TEM, N2 adsorption‐desorption, XRD, XPS, and TGA. Benefiting from the synergistic effects of the high porosity of CoOx−HPC support and efficient AuPd nanoparticles, tandem oxidation of HMF to FDCA can be carried out in the water. We have clarified that the catalysts with various cobalt valence states showed superior performance, and the highest FDCA yield of 97.2 % will be obtained under the optimal reaction conditions. Meanwhile, the kinetics study indicated that the oxidation of FFCA to FDCA was the rate‐determining step. Moreover, the AuPd/CoOx−HPC catalyst revealed excellent stability in HMF oxidation during four cycles. The experimental results demonstrated that as‐prepared AuPd/CoOx−HPC catalysts are efficient towards FDCA production from the selective oxidation of HMF.

Int. J. Environ. Sci. Technol.

“…In order to confirm interactive species (oxidizers) participating in the degradation of TcH, radical trapping tests were performed. Herein, ethylenediaminetetraacetic acid (EDTA) (h + scavengers) and isopropyl alcohol (IPA) ( • OH scavengers) are chosen as designated radical quenchers (Zhang et al 2019;Yuan et al 2019). The sonophotocatalytic experiments were performed with the addition of 30 mg L −1 (10 times more than TcH) of IPA and EDTA.…”

Section: Radical Trapping Studymentioning

confidence: 99%

Facile synthesis of SnO2 2D nanoflakes for ultrasound-assisted photodegradation of tetracycline hydrochloride

Yashas

Shivaraju

Thinley

et al. 2020

The present study demonstrates the facile synthesis of SnO 2 (tin oxide) 2D nanoflakes (2-dimensional) for sonophotocatalytic tetracycline hydrochloride (TcH) degradation. TcH is known to be widely used antibiotic, but even minute concentrations of it make the aqueous environment unsafe for living beings. As-synthesized SnO 2 was thoroughly characterized to reveal its morphology, crystal structure and other intrinsic properties. SnO 2 2D nanoflakes possessed excellent photocatalytic TcH degradation under visible light. Preliminary investigation inferred that sonophotocatalytic mode of TcH degradation was efficient over other modes with respect to degradation efficiencies for 20 mg L −1 TcH and 20 mg of SnO 2 . The optimum degradation of TcH was observed to be 88.82% in 135 min under LED (9 W, 220 V) irradiation with 30 mg of SnO 2 dosage and 40 kHz ultrasound. The degradation dynamics complied with pseudo-first-order kinetics where the kinetic rate constant (k) was 0.02 min −1 . Hence, SnO 2 2D nanoflakes were promising in mineralization of the biotoxin (TcH) in aqueous environments that accent its application to treat real-time water and wastewater.