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The modification of photocatalyst was the vital task for improving photocatalytic performance. Inspired by multi-level effect and activation regions of N atom, multi-level bismuth-based spheres (Bi2Ti2O7) and N-doped graphene quantum dots (N-GQD) were constructed for the photocatalytic application. Experiments demonstrated that the N-GQD/Bi2Ti2O7 multi-level spheres showed higher photocatalytic performance due to the multi-level effect and activation regions. Meanwhile, a series of characterizations proved that the separation efficiency of electron–hole pairs was improved after the N-GQD modifications. A possible mechanism was proposed for investigating N-GQD/Bi2Ti2O7 materials in the photocatalytic field. A novel N-GQD modified multi-level Bi2Ti2O7 spheres exhibited higher photocatalytic activity due to efficient electron transfer via N atoms. [ABSTRACT FROM AUTHOR]

In this work, a biofiber was used as the natural polymer carrier to design a BiVO 4 QDs/cellulose fiber composite for photocatalytic application. The biofiber was obtained from bamboo, which was green, abundant and short growth cycle in Asia. Naturally rich groups of biofiber provided many sites to absorb the Bi3+ to form the uniform distribution for BiVO 4 QDs. Moreover, a series of results indicated the strong connection was formed between biofiber and BiVO 4 QDs, which could increase the stability and electron transfer. Therefore, the new composite photocatalyst exhibited better stability and effectively photocatalytic activity. Moreover, the possible mechanism of synthesis and photocatalytic were discussed, which provided insight for synthesizing photocatalytic based on biomaterials. Extracting cellulose fiber of bamboo to designed a novel BiVO 4 QDs/fibers composite photocatalyst via the in-situ method, which showed an enhanced stability and photocatalytic activity. Image 1 • Bamboo as the source to prepared cellulose fibers due to its abundant and short growth cycle. • A novel BiVO 4 QDs/fibers composite photocatalyst was obtained via the in-situ method. • Rich groups of natural cellulose fibers provided many sites to form the stability and distribution BiVO 4. • The mechanism of synthesis and the photocatalytic process were discussed and proposed. [ABSTRACT FROM AUTHOR]

Boosting the photocatalytic activity with the help of surface plasmon resonance (SPR) effect has been demonstrated as an effective approach. In this work, the metallic Bi was deposited on surface of Bi 12 TiO 20 (BTO) via in-situ growth. A series of characteristics was used to analyze the morphology, light properties, crystal structure, chemical position of Bi/BTO composite. The Bi/BTO composite showed increased light absorption and smaller electron transfer resistance. The metallic Bi not only has the SPR effect to generate hot electrons to promote the production of more active species, but also the formed Schottky junction can promote the separation of electrons. Thus, the Bi/BTO composite exhibited higher photocatalytic activity. In addition, the possible photocatalytic mechanism also proposed for deep developing the plasmonic photocatalyst. • One-stpe in-situ metallic Bi deposited Bi 12 TiO 20. • The electron could transfer through Schottky junction to achieve the separation electron-hole pairs. • SPR effect of metallic Bi resulted in the production of hot carriers [ABSTRACT FROM AUTHOR]

An interface conductive TiO 2 (B)/GO/ZIF-8 composite photocatalyst was successfully designed, which not only offer carrier to enhance the stability and connection, but also acted as center of electron transfer to migrate electrons and reduced the recombination of e--h+ pairs. [Display omitted] • The TiO 2 (B)/GO/ZIF-8 composite was prepared successfully through in situ water-bath method. • The photocatalytic activity of TiO 2 (B)/GO/ZIF-8 composite was improved compared with pure TiO 2 (B) and ZIF-8. • The reactive O 2 − and h+ played the major roles in the IBP degradation. • The embedded GO effectively reduced the resistivity and improves the photocurrent. Photocatalytic technology was environmentally friendly and efficient, which have attracted much attention on solving environmental pollution. To develop visible-light driven photocatalyst with high activity, this paper to report a series of black titanium dioxide/graphene oxide/metal–organic framework (TiO 2 (B)/GO/ZIF-8) composite was synthesized and characterized by various method. The results exhibited that TiO 2 (B)/GO/ZIF-8 composite with high catalytic activity for degrading Ibuprofen (IBP) can be obtained through introduction of GO. The increased photocatalytic performance of TiO 2 (B)/GO/ZIF-8 was benefit from the electronegativity and strong light absorption. The results indicated that TiO 2 (B)/GO/ZIF-8 can act as suitable photocatalytic materials. [ABSTRACT FROM AUTHOR]

• CsPbBr 3 QDs were successfully adhered to BN nanosheets by an easy heterogeneous nucleation method. • The improving stability of CsPbBr 3 @BN sensor was realized by the protection of BN nanosheets for CsPbBr 3 QDs. • The fluorescence of CsPbBr 3 @BN sensor could be sensitively quenched by tetracycline through electron transfer process. The abuse of tetracycline (TC) antibiotics would seriously affect human health and hence the detection had become essential. Here, we had constructed a hydrophobicity of fluorescence sensor based on the excellent photoluminescence emission of CsPbBr 3 QDs and the hydrophobic ability of Boron Nitride (BN). This design effectively solved the instability of CsPbBr 3 QDs and realized the sensitive detection of TC. Under optimum conditions, the linear range of TC was 0–0.44 mg L−1 with the 6.5 μg L−1. Furthermore, the sensor was successfully used for the recognition of TC in honey and milk samples. This work also provided an ideal for designing CsPbBr 3 QDs-based on fluorescence sensor. [ABSTRACT FROM AUTHOR]

• Carbon materials was obtained from green tea and acted as the electron transfer medium to effectively enhance photocatalytic performance. • Charge was transferred through dual paths. • The Ni 2 P and CDs were all acted as the active sites for improving the photocatalytic performance. Carbon materials can act as electron transfer media to effectively enhance photocatalytic performance. In this study, carbon dots (CDs) were prepared using green tea to modify Ni 2 P/NiCo-LDH heterostructures. Benefitting from the Co-P bond formed between Ni 2 P and NiCo-LDH and biomass CDs, charge transfer was improved via dual channel. Ni 2 P and CDs acted as active sites for improving the photocatalytic performance. Owing to the synergistic process, the photoresponse capability of CDs/Ni 2 P/NiCo-LDH was significantly increased. In addition, the possible active species in the photocatalytic process are discussed. This study provides a design for ternary photocatalysts with carbon materials and phosphides. [Display omitted] [ABSTRACT FROM AUTHOR]