Removal of crystal violet by TiO2 loaded alkali-activated carbon hybrid material from Raphia farinifera fruit kernels: surface chemistry, parameters and mechanisms

Synergistic co-adsorptive removal of crystal violet and chromium(vi) from water by pozzolan-charcoal based geopolymer composites

“…This is also attributed to increase in Lewis acidic sites at pH o pH PZC which is detrimental for CV uptake. 12 At very pH (48), the excess Na + ions compete for the same binding sites with CV, reducing the number of available adsorption sites with concomitant repulsion between the adsorbed CV molecules and those in bulk solution. In contrast, monocomponent adsorption of Cr(VI) is favored since at 2 o pH o 6 (Fig.…”

“…The Flory Huggins isotherm was developed to define the feasibility and spontaneity of adsorbate attachment mechanisms to the adsorbent surface. 42 The mathematical expression of this isotherm is given by eqn (12).…”

“…Lo ´pez et al 11 assessed the CV binding capacity of a bentonite-based geopolymer and reported a sequestration density of 4.36 mg g À1 . According to Jacques et al, 12 acidic functional groups negatively impacts the adsorption of CV. Aluminosilicates, such as geopolymers, contain acidic sites which may thus diminish their adsorption potential for CV.…”

Synthesis and characterization of peanut shell-derived ferromagnetic activated carbon: application in the Fenton process for the degradation of methyl orange

“…The properties of activated carbon depend on the type of biomass, activation method (chemical or thermal), identity of the chemical activators (gas, acid, alkali, and salt), concentration of the activator agent, precursor-toactivator ratio, and pyrolysis conditions (temperature and residence time) (Chimi et al, 2022;Njewa and Shikuku, 2023;Taquieteu et al, 2023). Furthermore, the surface chemistry and performance of the metal oxide-carbon composite are also governed by the identity of the metal oxide(s) and the fraction by mass (Jacques et al, 2023). The complexity of the interactions between these variables implies that the properties of the activated carbon cannot be predicted a priori and must be optimized empirically for a particular biomass type.…”