Fabrication of ternary CoO/g‐C₃N₄/Co₃O₄ nanocomposite with p‐n‐p type heterojunction for boosted visible‐light photocatalytic performance

Abstract

BACKGROUND: Photocatalytic water treatment by using semiconductor material with low-cost, along with green and environmental features, is the main candidate for the actual application of photocatalytic reactions. RESULTS:The ternary CoO/g-C 3 N 4 /Co 3 O 4 nanocomposite with p-n-p type heterojunction was fabricated through a one-step solvothermal method follow-up water washing process. The as-prepared CoO/g-C 3 N 4 /Co 3 O 4 nanocomposite photocatalyst exhibited high visible-light photocatalytic efficiency (92% within 80 min) during the degradation of tetracycline (TC). The degradation rate constant of CoO/g-C 3 N 4 /Co 3 O 4 nanocomposite is 0.025 min −1 , which is 8.3, 4.3 and 2.3 times higher than that of single CoO, g-C 3 N 4 and binary CoO/g-C 3 N 4 , respectively. CONCLUSION: A series of characterization experiments further confirmed that the photocatalytic performance of the synthesized CoO/g-C 3 N 4 /Co 3 O 4 composite materials was improved due to the following two points: (i) improved separation and migration ability of photo-induced electron-hole pairs, and (ii) enhanced visible light absorption range.

Donor−π–Acceptor Heterosystem-Functionalized Porous Hollow Carbon Microsphere for High-Performance Li–S Cathode Materials with S up to 93 wt %

“…The p-type semiconductor CoO acts as an electron acceptor and V clusters play the part of the electron donor. 37,42 The carbon skeleton is an excellent electron conductor, which can build an electron-transfer bridge between CoO and V, leading to the formation of the donor−π−acceptor system. Thus, the synergetic effect between them brings about the significant enhancement of Co/V-HPCS.…”

Highly Efficient Photocathodic Protection Performance of ZIS@CNNs Composites under Visible Light

“…As displayed in Figure 5b, several strong peaks appeared in the range of 900−1700 cm −1 are caused by the skeleton vibration of C-N and C=N heterocycles [45]. The peak located at 808 cm −1 may be attributed to the breathing vibration of the s−triazine units [46]. The peaks between 3000 and 3500 cm −1 are caused by H2O molecules bound with surfaces of CNNs and ZIS@CNNs and the amino groups formed by the hydrothermal reaction [47].…”

Photocatalytic Self-Fenton System of g-C3N4-Based for Degradation of Emerging Contaminants: A Review of Advances and Prospects

“…Therefore, g-C 3 N 4 is considered as a promising candidate for the in situ generation of H 2 O 2 . Unfortunately, some inherent scientific problems including the easy recombination of electron-hole pairs, small specific surface area, and low utilization of visible light, limit the practical application of original g-C 3 N 4 in the actual photocatalytic self-Fenton system [96][97][98][99]. In order to solve the above limitations, as shown in Table 1, scientists have carried out various physical and chemical modifications of g-C 3 N 4 (Scheme 3) from the aspects of morphological control, defect engineering, element doping, heterojunction construction, etc., to enhance the visible light capture, carrier migration, and separation rate to further improve the photocatalytic self-Fenton degradation activity of g-C 3 N 4 [100][101][102][103][104].…”