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A novel method for removing Cr(VI) from aqueous solutions used a TiO 2 -graphene hydrogel with three-dimensional (3D) network structure. Graphene is capable of non-porous surface adsorption and π-π interaction adsorption. The combination between graphene and TiO 2 nanospheres promoted photo-induced charge transport and separation, thereby facilitating photocatalytic reduction of Cr(VI). For TiO 2 -rGH, the synergy of adsorption and photocatalysis played an important role in removing Cr(VI) from aqueous solutions. The TiO 2 -rGH material exhibited superb adsorption-photocatalysis performance, removing 100% Cr(VI) from a solution containing (5 mg/L) within 30 min under UV irradiation. Under continuous flow conditions, the adsorption-photocatalytic activity of TiO 2 -rGH was well maintained and the Cr(VI)-removing percentage was kept at 100% for a prolonged period until the breakthrough point was reached. [ABSTRACT FROM AUTHOR]

Here we reported a silver phosphate/graphene hydrogel (Ag 3 PO 4 /rGH) with efficient degradation of bisphenol A (BPA) with the synergy of adsorption and photocatalysis. The Ag 3 PO 4 /rGH 3D structure exhibits enriched adsorption-photocatalytic degradation ability for the removal of BPA under visible-light irradiation, and its three-dimensional structure facilitates the rapid recycle and reuse ability of the photocatalyst. The maximum adsorption capacity was 15 mg/g which is 2.1 times and 2.4 times than that of Ag 3 PO 4 /AC, Ag 3 PO 4 /Al 2 O 3 . The BPA could be even 100% removed in 12 min by the synergy of adsorption and photocatalysis under visible light irradiation. The removal ability was more than 90% after recycling 5 time indicating superiority of separation freely without complicated filter system for 3D structured hydrogel. The Ag 3 PO 4 /rGH 3D structure also showed high removal activity and stability in the continuous flow reaction system, and the 100% removal of BPA have been maintained more than 60 h. In all, Ag 3 PO 4 /rGH 3D structure possesses superiority of separation freely without complicated filter system. [ABSTRACT FROM AUTHOR]

Photocatalytic H 2 production from methanol is sustainable, yet challenges remain in avoiding carbon-containing gaseous by-products. Titanium silicalite-1 (TS-1) zeolite possesses attractive photocatalytic performance, but lack of modification strategies due to its microporous framework. Herein, we developed a pre-anchoring strategy to confine ultra-small Pt clusters inside TS-1 with ultra-low loading (0.2 mol%), in which Pt were anchored in Ti−OH nests by electronic metal-support interaction (EMSI). The optimal catalyst achieved a remarkable H 2 generation rate of 63.2 mmol g–1 h–1 in CH 3 OH solutions, along with the production of high-value chemical HCHO as the oxidation product with 96.9% selectivity. Investigations reveal that the EMSI between Pt and Ti facilitated the selective decomposition of CH 3 OH to H 2 and HCHO, leading to a nearly zero-carbon-emission process. Accordingly, we propose a light-driven carbon-negative "CO 2 →CH 3 OH→H 2 " route, coupling CO 2 utilization and green H 2 production with CH 3 OH as the intermediate, therefore offering a new perspective for "liquid sunshine". [Display omitted] • Pt clusters were successfully encapsulated inside TS-1 by a pre-anchoring method. • The optimal catalyst achieved a remarkable photocatalytic H 2 generation activity. • HCHO is the main oxidation product with nearly 100% selectivity. • The strong EMSI between Pt and Ti facilitated CH 3 OH decomposition to H 2 and HCHO. • A potential light-driven carbon-negative "CO 2 →CH 3 OH→H 2 " route was proposed. [ABSTRACT FROM AUTHOR]

Ag 3 PO 4 @g-C 3 N 4 core@shell composites were prepared via an ultrasonication/chemisorption method. The degradation of methylene blue (MB) over Ag 3 PO 4 @g-C 3 N 4 composites was investigated to evaluate their photocatalytic performance. The Ag 3 PO 4 @g-C 3 N 4 sample presented the best photocatalytic activity, degrading 97% MB after irradiation for 30 min. Superior stability was also observed in the cyclic runs. The composite has excellent photocatalytic activity and photo-stability and the optimal content of g-C 3 N 4 in the composites is 7.0 wt.%. The efficient photo-generated charge separation originated from a strong interaction in the intimately contact interface, which was confirmed by the results of photocurrent and EIS measurements. Based on the experimental results, a photocatalytic mechanism for organics degradation over Ag 3 PO 4 @g-C 3 N 4 photocatalysts was proposed. [ABSTRACT FROM AUTHOR]