Mesoporous Aluminum Phosphate Research Articles

Study of the effect of current intensity on the structural performance of electrogenerated mesoporous aluminum phosphate: application for adsorption.

To keep up with the development of contaminants in the water supply, it is required to create new adsorbents or improve current ones. The adsorption capacity of AlPO4 electrocoagulated with varying current intensities was examined. AlPO4 was produced by electrolysis in a NaCl solution using aluminum electrodes and a 0.1M phosphate buffer at varying current intensities. Current efficiency was enhanced. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy were used to analyze the adsorbents (FTIR). The specific surface area was estimated by the quantity of methylene blue adsorbed by particles in an aqueous solution. Numerous operating factors must be addressed, including pH, starting concentration, adsorbent dose, and contact duration. The electrostatic interaction between positively charged MB molecules and negatively charged adsorbents drives adsorption at alkaline pH. When describing equilibrium adsorption, the Langmuir model is more accurate. Modeling using an adsorption isotherm may further improve the predicted specific surface area. At 0.2 amperes, the observed specific surface area was 2.86 m2/g.

Easily synthesized mesoporous aluminum phosphate for the enhanced adsorption performance of U(VI) from aqueous solution

High-yield selective adsorbents and suitable modification methods are both significant for the efficient treatment of U-contaminated wastewater. In this work, a rich-mesoporous aluminum phosphate adsorbent (APO-10) was synthesized by simply increasing the mass of reactants under a fixed solvent volume. After increasing the mass of reactants ten times, APO-10 has the added defect level, the increased specific surface area, and mesoporous structure, and the increased number and enhanced adsorption ability of adsorption active sites (phosphorus-oxygen groups) on the surface, resulting in an enhanced adsorption performance of U(VI) in various environmental conditions. Its ultrahigh adsorption capacity calculated by the Langmuir model can reach 826.44 mg g−1 at pH = 5.5 and T = 298 K. Its crystal structure did not change after adsorption and remained at 584.40 mg g−1 after 6 cycles. Additionally, APO-10 shows an excellent uranium-selectivity over 68% from a mixed aqueous solution and has excellent applicability in the acidic and alkaline environment based on dynamic adsorption and desorption column experiments. This study not only provides a high-yield efficient selective adsorbent (APO-10) with excellent anti-radiation structure stability for the treatment of radioactive contamination but also provides a feasible modification method by simply increasing the mass of reactants.

Easily Synthesized Mesoporous Aluminum Phosphate for the Enhanced Adsorption Performance of U(Vi) from Aqueous Solution

Easily Synthesized Mesoporous Aluminum Phosphate for the Enhanced Adsorption Performance of U(Vi) from Aqueous Solution

A recoverable sandwich phosphorotungstate stabilized palladium (0) catalyst for aerobic oxidation of alcohols in water

The preparation, characterization and catalytic properties of tetra metal substituted sandwich phosphorotungstate [M4(H2O)2(PW9O34)2]10−(M4P2W18, M2+=Fe2+, Co2+, Mn2+, Cu2+, VO2+) stabilized Pd nanoparticles, which were in-situ encapsulated in mesoporous aluminum phosphate (mAPO) by a one-pot method, were demonstrated for aerobic oxidation of alcohol in water. The synthesized catalysts were characterized with N2 adsorption, XRD, TEM, FT-IR and UV–vis. TEM analysis revealed that Pd-M4P2W18/mAPO thus obtained has a mean palladium particle size of less than 5nm. The solid Pd-M4P2W18/mAPO catalysts exhibit excellent activity for aerobic oxidation of benzyl alcohols in water without any base additives. It was found the introduced M4P2W18 polyoxanions encapsulated palladium nanoparticles as both stabilizing agent and promoters, leading to enhanced activity and recyclability of palladium catalyst. The recycling test of representative Pd-(VO)4P2W18/mAPO for oxidation of benzyl alcohol suggested no significant decrease in activity and selectivity even after twelve times of successive reactions. This novel heterogeneous catalyst composed of polyoxometalates stabilized palladium nanocatalysts and mesoporous aluminophosphate can also be extended to the selective oxidation of various alcohols.

Efficient and selective conversion of lactic acid into acetaldehyde using a mesoporous aluminum phosphate catalyst

A mesoporous AlPO4catalyst has been found to show an excellent performance for decarbonylation of lactic acid to acetaldehyde.

溶胶凝胶介孔AlPO4玻璃镶嵌香豆素102的光学性质

溶胶凝胶介孔AlPO₄玻璃镶嵌香豆素102的光学性质

New catalysts for dichlorodifluoromethane hydrolysis: Mesostructured titanium and aluminum phosphates

Catalytic decomposition of CCl 2F 2 in the presence of water vapor and air was investigated over mesoporous titanium and aluminum phosphates. They are much more active than the ordinary titanium and aluminum phosphates. Comparison between two mesoporous catalysts shows that mesoporous aluminum phosphate is slightly more active than mesoporous titanium phosphate, but the latter catalyst exhibits higher stability than the former one during the reaction. The results based on NH 3-TPD and IR show that the activity of the catalysts is correlated with their surface acidity and hydroxyl groups.

S+I- Ionic Formation Mechanism to New Mesoporous Aluminum Phosphonates and Diphosphonates

Pure mesoporous aluminum phosphonates and diphosphonates have been synthesized through an S+I- surfactant-assisted cooperative mechanism by means of a one-pot preparative procedure from aqueous solution and starting from aluminum atrane complexes and phosphonic and/or diphosphonic acids. A soft chemical extraction procedure allows opening the pore system of the parent mesostructured materials by exchanging the surfactant without mesostructure collapse. The hybrid nature of the pore wall can be modulated continuously from organic-free mesoporous aluminum phosphates (ALPOs) up to total incorporation of organophosphorus entities (mesoporous phosphonates and diphosphonates). The organic functional groups become basically attached to the pore surface or inserted into the ALPO framework (homogeneously distributed along the surface and inner pore walls) depending on the use of phosphonic or diphosphonic acids, respectively. X-ray powder diffraction, transmission electron microscopy, and surface analysis techniqu...

Templated growth of mesoporous aluminum phosphate tubules using protein molecules of tobacco

Template-based approaches involving the co-operative organization of organic-inorganic assemblies as intermediates are emerging as a promising conceptual basis for future developments of porous inorganic materials. This field has been fuelled by new synthetic strategies such as “supramolecular templating” that have enabled precise engineering of pore size, shape and connectivity on the mesoscopic scale [1]. Randomly oriented layers of AlPO4 were synthesized and used as chemical sensors and low dielectric constant materials [2] earlier, but now, attention is being directed towards the formation of highly oriented films of metallic phosphates [3]. Development of AlPO4 based materials, in particular, has extended the compositional and structural diversity of the molecular sieves. Anisotropy induced by biomolecules leads to orientation and many exotic properties associated with the hierarchical structures and make them suitable for a range of applications including catalysis, ion-exchange separation, nuclear medicine and optics [4]. Though the synthetic templates namely latex fibers, polyurethane foams, starch gels, carbon nanotubes and organic molecules with long chains are being routinely employed for the synthesis of hierarchical inorganic frameworks [5], mineralization of biomolecular templates like tobacco mosaic virus (TMV) is a relatively new concept [6]. It leads to the formation of porous structures at nanolength scales that are strictly controlled by the presence of protein superstructures. Moreover, these biomolecular templates offer unusual symmetry and mesoscale ordering in the porous structures. Abundance and stability of the protein molecules present in tobacco leaves and their tendency to undergo self assembly has motivated us to use it directly as templates to synthesize self supporting hybrid films at liquid-air interface.