Cr(OH)3-NPs-CNC hybrid nanocomposite: a sorbent for adsorptive removal of methylene blue and malachite green from solutions

Abstract

In this article, Cr(OH) nanoparticle-modified cellulose nanocrystal (CNC) as a novel hybrid nanocomposite (Cr(OH)-NPs-CNC) was prepared by a simple procedure and used as a sorbent for adsorptive removal of methylene blue (MB) and malachite green (MG) from aqueous solution. Different kinetic models were tested, and the pseudo-second-order kinetic model was found more suitable for the MB and MG adsorption processes. The BET and Langmuir models were more suitable for the adsorption processes of MB and MG. Thermodynamic studies suggested that the adsorption of MB and MG onto Cr(OH)-NPs-CNC nanocomposite was a spontaneous and endothermic process. The maximum adsorption capacities for MB and MG were reached 106 and 104 mg/g, respectively, which were almost two times higher than unmodified CNC. The chemical stability and leaching tests of the Cr(OH)-NPs-CNC hybrid nanocomposite showed that only small amounts of chromium were leached into the solution.

Photocatalytic degradation of norfloxacin and its intermediate degradation products using nitrogen‐doped activated carbon–CuS nanocomposite assisted by visible irradiation

“…Figure shows quantitative recoveries (>95%) are obtained at pH = 9, and then they begin to decline. pH is a key factor in the production rate of hydroxyl radicals; in addition, initial pH of the solution controls the protonation of the functional groups on the adsorbent (catalyst) surface and degree of ionization of the adsorbate and has an important impact on the surface charge of the adsorbent . The effect of initial pH on the photocatalytic degradation of pollutants is contingent upon the pollutant type and the zero point charge of the photocatalyst…”

Synthesis of ZnO photocatalyst modified with activated carbon for a perfect degradation of ciprofloxacin and its secondary pollutants

“…As is observable in Figure a and b, quantitative recoveries (>95%) are acquired at pH 6.5 and afterwards it starts to decrease. The pH of the solution is one of the most significant variables in adsorption and degradation investigations, since initial pH of the solution controls the ionization degree of the adsorbate and protonation of the functional groups on the catalyst surface . pH also affects the surface charge of adsorbents .…”

“…The pH of the solution is one of the most significant variables in adsorption and degradation investigations, since initial pH of the solution controls the ionization degree of the adsorbate and protonation of the functional groups on the catalyst surface. [47] pH also affects the surface charge of adsorbents. [48] The effect of initial pH on the photocatalytic degradation of pollutants is contingent upon the pollutant type and the zero point charge (zpc) of the photocatalyst.…”

An Ordered Mesoporous Carbon Nanofiber Array for the Sensitive Electrochemical Detection of Malachite Green

“…MG is also used in the fish farming industry because it is well known as an antibacterial, antiseptic and antiprotozoal agent. However, studies have indicated that MG not only is a potential carcinogenic and mutagenic agent but also can cause Heinz body formation, cyanosis, an increased heart rate, quadriplegia, jaundice, vomiting and tissue necrosis . According to the European Union, the total amount of MG in animal‐derived food is limited to 2μg/kg.…”