Anionic azo dyes removal from water using amine-functionalized cobalt–iron oxide nanoparticles: a comparative time-dependent study and structural optimization towards the removal mechanism

Abstract

Efficient and selective removal of azo dyes from water by amine-functionalized-CoFe2O4 nanoparticles reliant on structural features such as size, charge, hydrophobicity/hydrophilicity, and S/C atoms.

The enhancement of reactive red 24 adsorption from aqueous solution using agricultural waste-derived biochar modified with ZnO nanoparticles

“… 10 Meanwhile, the adsorption capacities of the adsorbents in this study were similar to that of magnetic cobalt-iron oxide nanoparticles (CoFeNPs1/CoFeNPs2) for the removal of reactive orange 16. 15 However, several adsorbents have presented higher RR24 adsorption capacities than those of the biochars in this study, namely, CuFe 2 O 4 /activated carbon for the adsorption of acid orange 7, 54 Eucalyptus sheathiana bark biochar for the removal of methylene blue dye, 12 and Zr-based chitosan for the adsorption of Orange II. 4 The optimal solution pH for RR24 adsorption in this study was similar to those for the adsorption of various azo dyes reported in ref.…”

“… 4 The optimal solution pH for RR24 adsorption in this study was similar to those for the adsorption of various azo dyes reported in ref. 15 , where CoFeNPs1/CoFeNPs2 was used for the removal of reactive orange 16, and in ref. 4 , where Zr-based chitosan was utilized for the removal of Orange II.…”

“…Recently, a wide range of adsorbents have been applied in the treatment of azo dyes, consisting of zeolites, 10 activated carbon, 11 biochar, 12 fly ash, 13 magnetic graphene oxide/chitosan composites, 14 and nanoparticles. 15,16 Among adsorbents, biochars generated from agricultural wastes have widely been used to remove different pollutants. For example, bael shell ( Aegle marmelos )-derived biochar was used for the treatment of patent blue dye 17 and corncob-derived biochar was employed for the removal of ammonia from simulated wastewater.…”

Conversion of Recovered Ammonia and Carbon Dioxide into Urea in the Presence of Catalytically Active Copper Species in Nanospaces of Porous Silica Hollow Spheres

“…On the other hand, any bands assigned as hydrogenation products from carbon dioxide were not observed, , and the intensity of the band assigned as adsorbed water molecules was almost at the same level before and after the treatments under the pressurized argon atmosphere, indicating that water splitting to hydrogen did not occur in the reaction system. Moreover, the bands assigned as other nitrogenous products (nitrite, nitrate, hydrazine, and other amides) were not also observed. − These results suggested that there was negligible amount of the byproducts accompanied with production of urea. Figure shows the DR UV–vis-NIR spectra of the silica hollow spheres without/with various absorbents.…”

Synthesis and characterisation of novel Cu(ii)-anchored biopolymer complexes as reusable materials for the photocatalytic degradation of methylene blue

“…15,16 Recent studies have reported several biopolymer photocatalysts for the organic dye removal process. Methylene blue degradation also has been investigated, and various forms of biopolymer nanophotocatalysts such as ZnO nanoowers, 17 cellulose nanocrystals, 18 chitosan nanocomposite, 19,20 cellulose microbers, 21 chitosan microspheres, 22 nanoparticles, 23,24 nanosheets, 25 multi-walled nanotubes, 26 nanomaterials, 27 nanostructure compounds [28][29][30] and various forms of metal complexes such as trinuclear complexes, 31 binuclear complexes, 32 one-dimensional complexes, 33 and multifunctional complexes 34 have been effectively used in the degradation of dyes. However, there has hardly been any report on the application of biopolymer Schiff base complexes in the photocatalytic degradation of dyes.…”