Adsorption of methyl orange on nanoparticles of a synthetic zeolite NaA/CuO

Abstract

CuO supported on an NaA zeolite (CuO/NaA) was prepared with an NaA zeolite through the ion-exchange (CuO/NaA) method. The morphology and the physicochemical properties of the prepared samples were investigated by XRD, MEB, and EDS. The various parameters, such as contact time, catalyst dose, initial dye concentration, initial pH, and temperature, influencing the adsorption of methyl orange (MO) were optimized. The MO adsorption equilibrium was reached after 240 min of contact time. Removal of MO is better at neutral pH than in acidic and alkaline solutions. Among the tested models, the equilibrium adsorption data are well fitted by the Langmuir isotherm. The adsorption kinetics is best described by the pseudo-second-order model. The evaluation of the thermodynamic parameters, i.e. DG o , DH o , and DS o , revealed that MO adsorption was spontaneous, while the activation energy (20.98 kJ/mol) indicates a physical adsorption. The photodegradation of MO decreased from 100 mg/L down to 2 mg/L when the solution is exposed to visible light.

Interactions of the dye, C.I. direct orange 34 with natural clay

“…The increase in DG with increasing temperatures complies the assumptions of an (Table 6) indicates the increase in randomness during the adsorption process, probably because the number of desorbed water molecules is larger than that of adsorbed DO34 molecules. The same results obtained by El Hadj Mekatel et al [48].…”

Activated carbon/NiFe2O4 magnetic composite: A magnetic adsorbent for the adsorption of methyl orange

“…Yang et al synthesized 54 magnetic Fe 3 O 4 /AC nanocomposite from rice husk based AC, which 55 demonstrated perfect magnetic separation performance and a high 56 adsorption capacity for methylene blue from aqueous solution 57 [21]. Ai et al synthesized AC/CoFe 2 O 4 composite by a simple one- 58 step refluxing route and the adsorption property of AC/CoFe 2 O 4 59 composite was investigated as magnetic adsorbent for the removal 60 of malachite green from water [22]. Zhang et al developed a 61 magnetic adsorbent CuFe 2 O 4 /AC using a simple chemical copre- 62 cipitation procedure and its adsorption property was investigated 63 for the removal of acid Orange II [23].…”

Preparation and Characterization of Porous Carbon@ZnO‐NPs for Organic Compounds Removal: Classical Adsorption Versus Ultrasound Assisted Adsorption

“…Among the techniques used for environmental, adsorption using solid adsorbents has gained particular attention among the worldwide researchers as being highly efficient, of low operating cost with a simple operation process and capable for large scale pollutants removal . Commercial activated carbon, clays and zeolites are the most important adsorbents that have been used so far . However, the use of commercially synthesized adsorbents for the adsorption process has become limited and restricted since they exhibit some drawbacks like high production costs, poor regeneration ability.…”