Pd nanoparticles supported mesoporous γ-Al2O3 film as a reusable catalyst for reduction of toxic CrVI to CrIII in aqueous solution

Palladium nanoparticles supported on amine-functionalized SiO2 for the catalytic hexavalent chromium reduction

“…Potassium dichromate (K 2 Cr 2 O 7 ) was chosen as one the representative Cr(VI) compounds. It is well-known that the characteristics absorption peak of Cr(VI) is centered at 350 nm, which originates from the ligand (oxygen) to metal (Cr(VI)) charge transfer transition (LMCT) [24][25][26][27][28]. Thus the reduction processes can be monitored by UV-vis spectroscopy.…”

“…These drawbacks may greatly restrict the practical applications of these colloidal Pd nanocatalysts on environmental remediation. In this context, the incorporating of active Pd nanoparticles on or into solid matrices has already been acknowledged for preventing aggregation and facilitating recycling [5,[24][25][26][27][28]. In these studies, different solid supports have been used for the immobilization of guest Pd NPs.…”

“…Shen and co-workers [26] stabilized Pd NPs on electrospun polymer nanofibers and used them as recyclable catalytic material in the reduction of Cr(VI) to Cr(III) under mild conditions. Dandapat et al [25] prepared -Al 2 O 3 films by the hydrolysis followed by peptization of Al(OOH) and used them as host matrix for Pd NPs. The resulting supported Pd NPs show good stability throughout the reusability experiments in the Cr(VI) reduction using formic acid.…”

Reduced Phosphomolybdates as Molecular Catalysts for Hexavalent Chromium Reduction

“…[26,27] For large scale applications, more environmentally friendly and low cost catalysts are required. Our recent study has shown that the reduced POMs represent a kind of noble metal-free catalyst for this system.…”

In situ One‐pot Electrochemical Synthesis of Aluminum Oxide/polyaniline Nanocomposite; Characterization and Its Adsorption Properties towards Some Heavy Metal Ions

“…Aluminum oxide nanoparticles and nanocomposites have wide applications in various arrays of products and processes such as preparation of catalysts, [1][2][3][4] in medical sciences, [5][6][7] fabrication of sensors, [8][9][10] production of semiconductors, 11,12 batteries [13][14][15] and also as adsorbent for a wide variety of chemical species. [16][17][18] Nanoparticles have been synthesized by a variety of techniques and methods including ball milling, 19 sol-gel, 20 pyrolysis 21 and hydrothermal 22 methods.…”