Visible-light-driven removal of tetracycline antibiotics and reclamation of hydrogen energy from natural water matrices and wastewater by polymeric carbon nitride foam.

Visible light photocatalytic degradation of tetracycline over TiO2

Recent developments in fabrication and structure regulation of visible-light-driven g-C3N4-based photocatalysts towards water purification: A critical review

Promoting visible-light-induced photocatalytic degradation of tetracycline by an efficient and stable beta-Bi2O3@g-C3N4 core/shell nanocomposite

Visible-light activation of persulfate by TiO2/g-C3N4 photocatalyst toward efficient degradation of micropollutants

Optimizing the heterojunction structure of semiconductor photocatalysts is significant for taking full advantage of their abilities for organic molecules degradation. Here, we demonstrate a feasible strategy of polymerizing the quantum-thick graphitic carbon nitride (g-C3N4) on to the surface of anatase titanium dioxide (TiO2) nanosheets with exposed {001} facets to form the TiO2@g-C3N4 (TCN) core-shell quantum heterojunction for improving photocatalytic tetracycline degradation activity. 100 mg of TCN photocatalyst shows the highest tetracycline degradation rate of 2.2 mg/min, which is 36% higher than that of the TiO2/g-C3N4 random mixture (TCN(mix)), 2 times higher than that of TiO2, and 2.3 times higher than that of bulk g-C3N4. Results also indicate that h+ and ·O2− are the main oxidant species for the efficient photocatalytic reaction. The decisive factors in improving the photocatalytic activity of TCN is the unique structural advantages of quantum-thick g-C3N4 shell, compact and uniform contact interface, richly available reaction sites, more surface adsorbed hydroxyl (OH) groups. Efficient electron transfer between TiO2 and g-C3N4 is also demonstrated by the significant enhancement of photocurrent response of TCN electrodes and decrement of fluorescence emission spectra. This work demonstrates new sights for synthesizing high-efficient and environment-stable photocatalysts by engineering the surface heterojunction.

Compact and uniform TiO2@g-C3N4 core-shell quantum heterojunction for photocatalytic degradation of tetracycline antibiotics

The invention relates to a CdS-based green ray upconversion photocatalytic material and a preparation method thereof. According to the preparation method, an adopted sensitizer is octaethyl porphilin platinum, and an acceptor is 9,10-diphenyl anthracene. Compared with a rare earth fluoride upconversion photocatalytic technique, the CdS-based green ray upconversion photocatalytic material has the advantages that the spectral absorption range is wide, the upconversion stimulation threshold is low, and good upconversion and photocatalytic effects can be achieved under the stimulation of a green ray waveband of normal xenon lamp. Compared with a CdS-based photocatalytic material which takes oleic acid as a core, has the same structure and does not have a green ray upconversion function, the CdS-based green ray upconversion photocatalytic material has the advantage that low-energy green ray photons are converted into near ultraviolet high-energy photons by virtue of a triplet state-triplet state annihilation upconversion process, so that the utilization efficiency of the CdS to the low-energy green ray photons is adequately improved.

Lai Min

Papers

Compact and uniform TiO2@g-C3N4 core-shell quantum heterojunction for photocatalytic degradation of tetracycline antibiotics

CdS-based green ray upconversion photocatalytic material and preparation method thereof