Improvement of dyes removal from aqueous solution by Nanosized cobalt ferrite treated with humic acid during coprecipitation

Abstract

Highly effective novel adsorbent [CoFe 2 O 4-humic acid(HA)] was synthesized by co-precipitation technique at pH 6 (H6) and pH 8 (H8). XRD, S BET and Zeta-potential measurements were used to study the physicochemical properties of the prepared nanoparticles. XRD results showed that the chemical treatment of CoFe 2 O 4 by HA causes the appearance of carbon as new active sites for adsorption process. Batch adsorption tests were achieved to eliminate anionic remazole-red (RR-133) and cationic methylene blue (MB) dyes. The obtained data showed that H6 and H8 solids calcined at 300 and 500 °C have higher adsorption rate for removing of dye than unmodified cobalt iron mixed oxide. The removal reached 100% after a period of dye contact time 2 min and 30 min for RR and MB, respectively. The uptake of RR and MB was much affected by the pH of dye solution. The pseudo-second-order kinetic model was the most fitted well and the adsorption process followed the Langmuir isotherm model. The adsorption of dye on adsorbent was chemisorption process. The as-prepared adsorbents can be regenerated and reused four times for both dyes. The efficiency of the prepared nano-samples and durability as adsorbent were accomplished.

Integrated experimental and theoretical insights for Malachite Green Dye adsorption from wastewater using low cost adsorbent

“…However, we can conclude that ion diffusion act as physical forces effects on the behavior of MG dye molecules (adsorbates) in the proximity area of the adsorbent 'Al-2'. The same behavior was obtained for methylene blue adsorption onto nanosized cobalt ferrite treated with humic acid prepared by co-precipitation method (Ibrahim et al 2019).…”

“…where R is the gas constant (8.314 J/mol K) and T is the absolute temperature. The constant β gives the mean free energy, E D-R (kJ mol À1 ) of adsorption per molecule of the adsorbate when it is transferred to the surface of the solid from infinity in the solution and can be computed using Equation (10) (Lin & Juang 2002;Ibrahim et al 2019;Li Meng & Zhang 2019):…”

Bi nanosphere-decorated oxygen-vacancy BiOBr hollow microspheres with exposed (110) facets to enhance the photocatalytic performance for the degradation of azo dyes

“…68,69 Then, the E CB values of 15%Bi-BiOBr (OVs) was determined to be À0.61 V vs. NHE. The valence band (VB) potential (E VB ) of the 15%Bi-BiOBr (OVs) can be expressed by eqn (3).…”

“…Azo dyes with the typical NQN group are a kind of watersoluble pollutants perceived as a refractory and hazardous substance because of their toxicity, stability, persistence, and non-volatile property in water, which have negative effects on both water resources and natural ecosystems. [1][2][3][4] Azo dyes and their intermediates pose a serious threat to human health, and the presence of these azo dyes in industrial effluents can make the water highly colored and viscous, which directly affects the light penetration within such polluted water sources. [5][6][7] To remediate the azo dye pollutants in water resources and the ecosystem, numerous methods have been explored, including adsorption, chemical oxidation, electrochemical techniques, biological degradation, and photocatalysis.…”

Facile synthesis of recoverable superparamagnetic AgFeO2@Polypyrrole/SiO2 nanocomposite as an excellent catalyst for reduction and oxidation of different dyes in wastewater

“…Hao et al [24] prepared an in situ ferrite process (IFP) and used it for methylene blue (MB) removal from binary wastewater. Ibrahim et al [25] synthesized nanosized cobalt ferrite treated with humic acid for the removal of dyes from an aqueous solution. Vîrlan et al [26] synthesized MgFe 2 O 4 for adsorption of cationic dyes.…”