Removal of Cu2+ from Aqueous Solutions by Magnetic Nanoparticles-Pomelo Peel Composite

2016 ◽  
Vol 675-676 ◽  
pp. 154-157 ◽  
Author(s):  
Itsaraporn Pengsaket ◽  
Kheamrutai Thamaphat ◽  
Pichet Limsuwan
Keyword(s):  
Heavy Metal ◽  
Magnetic Nanoparticles ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Average Particle Size ◽  
Weight Ratio ◽  
Precipitation Method ◽  
Average Particle ◽  
Pomelo Peel ◽  
Adsorption Capacities

Many researchers have currently interested in using Fe3O4 magnetic nanoparticles (MNPs) impregnated onto agricultural wastes for removal of heavy metal ions in wastewater treatment process. In this work, the MNPs-pomelo peel powder (MNPs-PP) composites were developed and their adsorption capacities of heavy metal ions were studied as well. The MNPs-PP samples were synthesized by co-precipitation method in different ratios; 2:1, 2:2, 2:4, 2:5, and 2:6 (by weight). The results showed that the as-synthesized MNPs were mainly spherical shape with an average particle size of approximately 12.7 ± 0.6 nm. Then, the MNPs, PP and MNPs-PP in different ratios were used as adsorbents for adsorption of 25 ppm Cu2+ in aqueous solution. The pH and temperature of solution were kept constant at 5 and 30 °C, respectively. From the experiment, it was found that the adsorption capacities decreased in the following order: PP > MNPs-PP (2:6) > MNPs-PP (2:5) > MNPs-PP (2:4) > MNPs-PP (2:2) > MNPs-PP (2:1) > MNPs. It indicated that the adsorption capacity of as-synthesized MNPs-PP is significantly higher than that of sole MNPs. Furthermore, the adsorption capacities of MNPs-PP increased with increasing the weight ratio of PP. The MNPs-PP developed herein has demonstrated not only high adsorption efficiency but also have shown additional benefits such as ease to synthesis, cost-effectiveness, environmental-friendliness, and ease to separate from treated water by an external magnet.

Removal of Lead Contaminants with γ-Fe2O3 Nanocrystals

2020 ◽  
Vol 12 (3) ◽  
pp. 422-426 ◽  
Author(s):  
Bulgan Tsedenbal ◽  
Imad Hussain ◽  
Ji Eun Lee ◽  
Bon Heun Koo
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Equilibrium ◽  
Average Particle Size ◽  
Freundlich Isotherm ◽  
Precipitation Method ◽  
Maximum Adsorption Capacity ◽  
Average Particle ◽  
Nano Adsorbent

γ-Fe2O3 (maghemite) nanocrystals were synthesized by co-precipitation method at room temperature have been used to remove Pb+2 from aqueous solutions. The prepared of this sample was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM). XRD patterns indicated the maghemite structure of average particle size of ∼12 nm, which was further confirmed by the FESEM images of the γ-Fe2O3 nanosrystals. Magnetic saturation of synthesized maghemite was found to be 68.4 emu g–1. Adsorption experiments were tested for pH of the solutions, contact time and initial concentration of metal ions. The kinetic data of adsorption of heavy metal ions on the surface of the synthesized nano-adsorbent was described by a pseudo-second order equation. The adsorption equilibrium study exhibited that the heavy metal ions adsorption of maghemite nanocrystals followed a Langmuir and Freundlich isotherm model. Pb2+ adsorption equilibrium data were best fitted to Langmuir equation and maximum adsorption capacity of 25 mg g–1 was obtained. This work demonstrates that the synthesized γ-Fe2O3 nanocrystals can be considered as prospective nano-adsorbent.

scholarly journals Adsorption Equilibrium for Heavy Metal Divalent Ions (Cu2+, Zn2+, and Cd2+) into Zirconium-Based Ferromagnetic Sorbent

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Agnes Yung Weng Lee ◽  
Soh Fong Lim ◽  
S. N. David Chua ◽  
Khairuddin Sanaullah ◽  
Rubiyah Baini ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Average Particle Size ◽  
Isotherm Models ◽  
Average Particle ◽  
Property A ◽  
Divalent Ions ◽  
Solution Ph

Zirconium-based ferromagnetic sorbent was fabricated by coprecipitation of Fe2+/Fe3+ salts in a zirconium solution and explored as a potential sorbent for removing the Cu2+, Zn2+, and Cd2+ from aqueous solution. The sorbent could easily be separated from aqueous solution under the influence of external magnetic field due to the ferromagnetism property. A trimodal distribution was obtained for the sorbent with average particle size of 22.74 μm. The –OH functional groups played an important role for efficient removal of divalent ions. The surface of the sorbent was rough with abundant protuberance while the existence of divalent ions on the sorbent surface after the sorption process was demonstrated. Decontamination of the heavy metal ions was studied as a function of initial metal ions concentration and solution pH. Uptake of the heavy metal ions showed a pH-dependent profile with maximum sorption at around pH 5. The presence of the ferromagnetic sorbent in solution at different initial pH has shown a buffering effect. Equilibrium isotherms were analyzed using Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models. Adequacy of fit for the isotherm models based on evaluation of R2 and ARE has revealed that heavy metal ions decontamination was fitted well with the Freundlich model.

Adsorption of Heavy Metal Ions by Chelate-Fiber Prepared by Chemical Surface Modification

2011 ◽  
Vol 308-310 ◽  
pp. 178-181
Author(s):  
Xin Liang Liu ◽  
Li Jun Wang ◽  
Yong Li Chen ◽  
Nan Chen ◽  
Shuang Fei Wang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Optimal Process ◽  
Order Model ◽  
Chemical Surface ◽  
Adsorption Capacities ◽  
Chemical Surface Modification ◽  
Pseudo Second Order ◽  
Mechanism Of Sorption

The bagasse fibers were activated by alkalize and etherified. 1,2-ethanediamine and carbon disulfide were used to modify the etherify fiber to get the chelate-fiber contained sulfur and nitrogen. The FTIR was used to characterize the xanthated aminating-fiber (XAF). The mechanism of sorption properties for heavy metal ions were studied. As the results shown, the optimal process to prepare the XAF was that the reaction time, concentration of NaOH and dosage of CS2 was 60min, 12% and 2mL, respectively. The chelate-fiber containing sulfur and nitrogen possessed high adsorption capacities for Cu(II) and the mechanism of sorption fitted the pseudo-second-order model well.

Sign in / Sign up

Export Citation Format

Share Document