Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C₃N₄ composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH₄Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C₃N₄ is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C₃N₄ composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C₃N₄. The degradation rate improves from 0.007 min⁻¹ to 0.022 min⁻¹, which is a comparable photocatalytic performance compared with other g-C₃N₄-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C₃N₄ to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C₃N₄ efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C₃N₄ and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C₃N₄ efficiently, but also broadens the application of SAPOs in the photocatalytic field.

Architectural Design of Self-Assembled Hollow Superstructures

Colloidal nanoparticle assemblies are widely designed and fabricated via various building blocks to enhance their intrinsic properties and potential applications. Self-assembled hollow superstructures have been a focal point in nanotechnology for several decades and are likely to remain so for the foreseeable future. The novel properties of self-assembled hollow superstructures stem from their effective spatial utilization. As such, a comprehensive appreciation of the interactive forces at play among individual building blocks is a prerequisite for designing and managing the self-assembly process, toward the fabrication of optimal hollow nanoproducts. Herein, the emerging approaches to the fabrication of self-assembled hollow superstructures, including hard-templated, soft-templated, self-templated, and template-free methods, are classified and discussed. The corresponding reinforcement mechanisms, such as strong ligand interaction strategies and extra-capping strategies, are discussed in detail. Finally, possible future directions for the construction of multifunctional hollow superstructures with highly efficient catalytic reaction systems and an integration platform for bioapplications are discussed.

Synthesis and catalytic application of alumina@SAPO-11 composite via the in situ assembly of silicoaluminophosphate nanoclusters at an alumina substrate

An alumina@SAPO-11 composite with a core–shell structure has been synthesized via the in situ assembly and crystallization of silicoaluminophosphate nanoclusters.

Fabricating self-assembled SAPO-5 with tailored mesoporosity and acidity using a single template

SAPO-5 zeolite with a bimodal pore system was hydrothermally synthesized using di-n-butylamine as single template. The structural and catalytic properties of the hierarchical SAPO-5 were extensively characterized and compared to those of conventional SAPO-5 using triethylamine as template.

Isopropylation of 2-naphthol over mesoporous silicoaluminophosphate-37 (MESO-SAPO-37): the effect of bond dissociation energy on product distribution

Mesoporous-SAPO-37 is found to be a promising catalyst for 2-naphthol alkylation with the formation of 6-isopropyl-2-naphthol as a major product (60%).

An environmentally friendly route for grafting of molybdenum carbonyl onto a diaminosilane-modified SBA-15 molecular sieve and its catalytic behaviour in olefin epoxidation

Molybdenum carbonyl (Mo(CO)₆) grafted onto a diaminosiloxane functionalized SBA-15 surface and showed promising activity for epoxidation of olefins.

Thorough investigation of varying template combinations on SAPO-34 synthesis, catalytic activity and stability in the methanol conversion to light olefin

Crystals of SAPO-34 molecular sieves were synthesized under hydrothermal conditions by using tetraethylammonium hydroxide, morpholine and a mixture of them as structure-directing agents.