Green Synthesis of Silver Nanoparticles Using Cashew Nutshell Liquid (CNSL): Characterization and Methylene Blue Removal Studies.

In this work, silver nanoparticles (AgNPs) were synthesized from cashew nutshell liquid (CNSL) by varying the concentration of silver ions and the pH of the CNSL extract. The synthesized AgNPs were further characterized to study their surface, structural, and morphological properties and tested for the removal of methylene blue (MB) dye. The results of this study showed that depending on the conditions, particles of various sizes, ranging from 1 to 60 nm, and different degrees of stabilization and agglomeration were produced.

Ni-Doped Ordered Nanoporous Carbon Prepared from Chestnut Wood Tannins for the Removal and Photocatalytic Degradation of Methylene Blue.

In this work, Ni-doped ordered nanoporous carbon was prepared by a simple and green one-pot solvent evaporation induced self-assembly process, where chestnut wood tannins were used as a precursor, Pluronic F-127 as a soft template, and Ni as a crosslinking agent and catalytic component. The prepared carbon exhibited a 2D hexagonally ordered nanorod array mesoporous structure with an average pore diameter of ~5 nm. Nickel was found to be present on the surface of nanoporous carbon in the form of nickel oxide, nickel hydroxide, and metallic nickel.

Mechanistic insights into acetaminophen removal on cashew nut shell biomass-derived activated carbons.

Activated carbons prepared from cashew nut shells by chemical activation with phosphoric acid were tested for the removal of acetaminophen. It was found that an increase in carbonization temperature resulted in increased pore volume and decreased amount of surface functional groups. Potentiometric titration analysis indicated that the majority of surface groups on carbons are acidic.

Effect of surface chemical and structural heterogeneity of copper-based MOF/graphite oxide composites on the adsorption of ammonia.

Two graphite oxides (GOs), obtained by oxidation of graphites of different origins, were used as composite components with copper-based metal-organic frameworks, MOFs. Such composites were tested for ammonia adsorption at room temperature, in dry and moist conditions. The materials were characterized by X-ray diffraction, FT-IR spectroscopy, adsorption of nitrogen, and thermal analysis.

Reactive adsorption of NO2 at ambient conditions on iron-containing polymer-based porous carbons.

Adsorption of NO(2) and retention of NO (the product of NO(2) reduction by carbon) on iron-containing materials prepared from polystyrenesulfonic acid-co-maleic acid iron salt were studied. The surface of the materials was characterized using nitrogen adsorption, XRD, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), and FTIR spectroscopy, and thermogravimetric analysis (TGA). The results showed the positive effects of the pore volume and well-dispersed iron species (Fe(2)O(3), FeSO(4), and FeS) on the performance of carbons as NO(2) adsorbents at room temperature.

Effect of silver nanoparticles deposited on micro/mesoporous activated carbons on retention of NO(x) at room temperature.

Wood-based activated carbon was modified by deposition of silver using Tollens method. Adsorbents with various contents of silver were used to study NO(2) and NO (the product of NO(2) reduction by carbon) retention. The surface of the initial and exhausted materials was characterized using adsorption of nitrogen, XRD, SEM/EDX, FTIR and TA.

Interactions of NO2 and NO with carbonaceous adsorbents containing silver nanoparticles.

Interactions of NO(2) and NO (the product of NO(2) reduction by carbon) with biomass-based carbonaceous materials with silver nanoparticles deposited on the surface were studied. The surface of the materials was characterized using adsorption of nitrogen, X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and thermogravimetric analysis (TGA). The results showed that the amount of NO(2) adsorbed, its conversion to NO, and the amount of NO released from the carbon surface depend on the carbon's content of silver.

The effects of urea modification and heat treatment on the process of NO2 removal by wood-based activated carbon.

The removal of NO(2) on urea-modified and heat-treated wood-based activated carbons was studied. From the obtained results it was found that these modifications, especially when done at 950 degrees C, have a positive effect on NO(2) adsorption and on the retention of NO (the product of NO(2) reduction by carbon). The presence of moisture in the system enhances the removal of NO(2) but negatively affects the retention of NO.

Adsorption of methyl mercaptan on activated carbons.

Activated carbons of different origins were studied as methyl mercaptan adsorbents in wet, dry, and oxidizing conditions. The materials were characterized using adsorption of nitrogen, Boehm titration, and thermal analysis. Investigation was focused on the feasibility of the removal of methyl mercaptan on activated carbons and on the role of surface chemistry and porosity in the adsorption/oxidation processes.