Alloying nanoparticle is a method to adjust the surface properties of catalysts so as to enhance catalytic performances of them and they usually exhibit outstanding characteristics which are disparate from monometallic nanoparticles. In this regard, a bimetallic catalyst based on sliver and cobalt nanoparticles incorporated in the structure of hierarchical ZSM-5 (Hi-ZSM-5) was produced. This novel catalyst was simply produced through simultaneous chemical reduction of silver and cobalt ions in the presence of Hi-ZSM-5. The solid support (Hi-ZSM-5) has played a highly crucial part in this catalyst because it offers a high surface area for deposition of nanoparticles as active sites and facilitates diffusion of reactants by its mesopores. The catalytic aspects of AgÀ Co/Hi-ZSM-5 were examined in A 3 coupling reaction of amine, aldehyde, acetylene in water media and impacts of different reaction parameters were extensively investigated. Outperforming both monometallic counterparts, the catalyst was found highly selective, stable and recoverable in the reaction and it did not show any sign of chemical or morphological alterations after 5 runs. The chemical composition and morphological properties of the catalyst were evaluated by XRD, BET, SEM-EDS, TEM, DRS-UV and ICP-AES techniques.

No abstract

The presence of perfluorooctanoic acid, a perfluoralkyl substance, in water sources has raised health concerns due to its toxicity. Finding effective adsorbents is essential to ensure healthy sources of water for consumption. In this study, a heptazine-based polymer network (Py-HPOP) was synthesized using a one-pot nucleophilic substitution of 2,5,8-trichloro-s-heptazine (TCH) with 4,4′,4″,4‴-(pyrene-1,3,6,8-tetrayl) tetraaniline (Py-TA). For comparison, a triazine-based polymeric network (Py-TPOP) was also prepared using 2,4,6-trichloro-1,3,5-triazine under similar conditions. Both polymers were used to treat aqueous solutions containing 1 mg/L PFOA. Py-TPOP exhibited superior adsorption capacity (98.4% PFOA removal) relative to Py-HPOP (80.8% PFOA removal) despite Py-HPOP’s higher Brunauer–Emmett–Teller (BET) surface area S BET at 205 m2 g–1. The effect of electrostatic interactions was also observed as a critical factor for PFOA adsorption as demonstrated by the change in PFOA adsorption by both polymers under basic, neutral, and acidic conditions. This investigation illustrates a facile synthesis of amorphous covalent frameworks as strong, competitive adsorbents for PFOA removal from water.