Removal of heavy metal ions by magnetic chitosan nanoparticles prepared continuously via high-gravity reactive precipitation method

2017 ◽  
Vol 174 ◽  
pp. 1192-1200 ◽  
Author(s):  
Hong-Lei Fan ◽  
Shao-Feng Zhou ◽  
Wei-Zhou Jiao ◽  
Gui-Sheng Qi ◽  
You-Zhi Liu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Chitosan Nanoparticles ◽  
Precipitation Method ◽  
High Gravity ◽  
Magnetic Chitosan

Synthesis of graphene oxide/ polyvinyl alcohol (GO/PVA) composite film as an adsorbent

2021 ◽  
Vol 10 (3) ◽  
pp. xx-xx
Author(s):  
Thu Le Dieu ◽  
Hoang Tran Vinh
Keyword(s):  
Waste Water ◽  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Composite Film ◽  
Heavy Metal Ions ◽  
Precipitation Method ◽  
Initial Concentration ◽  
Ft Ir ◽  
Co Precipitation

In this study, heavy metal ions or organic in the aqueous solution are removed by adsorbent without filtration or centrifugation as well as incorporate magnetic materials into the adsorbent. A composite film GO/PVA from PVA and self – synthesized GO by co - precipitation method has synthesized successfully. This composite was characterized by XRD, SEM, FT-IR to evaluate the properties of this material. The results showed that there was an interaction between GO and PVA so we have tested the adsorption capacity of this composite with Co(II) ions and the obtained efficiency of this process was 99.5% with the initial concentration of solution is 20 mg.L-1. This film is completely capable of removing heavy metal ions from waste water.

scholarly journals Heavy metal ions removal from aqueous solution by xanthate-modified cross-linked magnetic chitosan/poly(vinyl alcohol) particles

RSC Advances ◽  
2017 ◽  
Vol 7 (45) ◽  
pp. 27992-28000 ◽  
Author(s):  
Long Lv ◽  
Nan Chen ◽  
Chuanping Feng ◽  
Jing Zhang ◽  
Miao Li
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Vinyl Alcohol ◽  
Heavy Metal Ions ◽  
Poly Vinyl Alcohol ◽  
Magnetic Chitosan ◽  
Heavy Metal Ions Removal ◽  
Metal Ions Removal

Xanthate-modified cross-linked magnetic chitosan/poly(vinyl alcohol) particles (XCMCP) were synthesized and applied to remove Pb(ii) and Cu(ii) ions from aqueous solutions.

scholarly journals SYNTHESIS Mg-Al HYDROTALCITE FOR ADSORPTION OF Pb2+ IN WATER

2018 ◽  
Vol 127 (1A) ◽  
pp. 15
Author(s):  
Ngô Minh Đức
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Surface Area ◽  
Heavy Metal Ions ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Loading Capacity ◽  
Capillary Diameter ◽  
Adsorption Experiment ◽  
Co Precipitation

Hydrotalcite was synthesized using the co-precipitation method with  the Mg/Al molar ratio of 3.0 and then  calcined at 450 °C, for 5 h. The obtained solid was characterized by XRD, BET. As seen from results of physical characterization, the synthesized Hydrotalcite material owns large surface area of  309.3 m<sup>2</sup>/g, mean capillary diameter of 11.52 nm. Hydrotalcite application as adsorbent of heavy metal ions. The results of adsorption experiment for Pb<sup>2+</sup> in water showed that the absorption equilibrium was attained after 90 minutes at pH = 5 with maximum adsorption loading capacity of 144.93 mg/g. The synthesized adsorbent could be regenerated with HNO<sub>3</sub> (1M) solution

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 Chloride Ion Removal from the Wet Flue Gas Desulfurization and Denitrification Wastewater Using Friedel’s Salt Precipitation Method

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Ping Fang ◽  
Zi-jun Tang ◽  
Xiong-bo Chen ◽  
Jian-hang Huang ◽  
Zhi-xiong Tang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Flue Gas ◽  
Heavy Metal Ions ◽  
Chloride Ion ◽  
Precipitation Method ◽  
Effective Control ◽  
Salt Precipitation ◽  
Experimental Conditions ◽  
Friedel’S Salt

The desulfurization and denitrification wastewater (DDW) from the wet flue gas treatment project is difficult to be treated and recycled because of high chloride ion (Cl−) concentration. Cl− can cause equipment and piping corrosion. However, there is a lack of cost-effective treatment technologies for the removal of Cl− from the DDW. In this research, the feasibility of Cl− removal from the DDW using Friedel’s salt precipitation method was evaluated. Factors affecting the Cl− removal, such as Ca(OH)2 dosage, NaAlO2 dosage, solution’s initial pH, solution’s temperature, reaction time, stirring speed, and anions (SO42−, NO3−, and F−), were investigated, and the optimal experimental conditions for Cl− removal were determined. Experimental results showed that Friedel’s salt precipitation method can remove Cl− effectively and can achieve synergistic removal of SO42−, F−, and heavy metal ions. Under the best experimental conditions, the average removal efficiencies of Cl−, SO42−, F−, and heavy metal ions reach more than 85%, 98%, 94%, and 99%, respectively. The Cl− removal mechanism studies showed that Cl− can be removed by precipitation as Ca4Al2Cl2(OH)12. The purified wastewater and the precipitated solid can be reused to reduce the consumption of water and alkali. Friedel’s salt precipitation method is an effective control technology for the synergistic removal of Cl−, SO42−, F−, and heavy metal ions and has enormous potential to be applied in the industrial wastewater treatment field.

scholarly journals Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ping Fang ◽  
Zi-jun Tang ◽  
Xiong-bo Chen ◽  
Jian-hang Huang ◽  
Zhi-xiong Tang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Precipitation Method ◽  
Solution Temperature ◽  
Commercial Application ◽  
High Concentration ◽  
Fluoride Ions ◽  
Experimental Conditions ◽  
Sulfate Ions

The feasibility of removal of sulfate ions from the sodium alkali FGD wastewater using the ettringite precipitation method was evaluated. Factors affecting the removal of sulfate ions, such as NaAlO2 dosage, Ca(OH)2 dosage, solution temperature, anions (Cl−, NO3− and F−), and heavy metal ions (Mg2+ and Mn2+), were investigated, and the optimal experimental conditions for the removal of sulfate ions were determined. Experimental results indicate that the ettringite precipitation method can effectively remove SO42− with removal efficiency of more than 98%. All the investigated factors have influences on the removal of sulfate ions, and among them, the dosage of reagents, solution temperature, and fluoride ions have the strongest influence. In addition, the method can effectively synergistically remove F− and heavy metal ions with removal efficiencies of more than 90% and 99%, respectively; meanwhile, Cl− and NO3− also can be removed minimally by the method. The result of actual wastewater treatment shows that the method is feasible for treating high-concentration sulfate wastewater. The ettringite precipitation method has the potential to be a commercial application in the future.

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.

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