scholarly journals Arsenic removal from water by Zr-γ- FeOOH nanoparticles

2019 ◽  
Vol 2 (1) ◽  
pp. 112-120
Author(s):  
Nguyen Dinh Trung ◽  
Le Thi Ha Lan
Keyword(s):  
Ammonium Chloride ◽  
Arsenic Removal ◽  
Precipitation Method ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Adsorption Data ◽  
Wide Ph Range ◽  
Ph Range ◽  
Co Precipitation ◽  
Competitive Ions

Zr-γ-FeOOH nanoparticle adsorbent for As(V) and As(III) removal was prepared by a chemical co-precipitation method. Compared with γ-FeOOH, the addition of Zr enhanced the adsorptive capacities of As(V) and As(III). The maximum adsorptive capacities for As(V) and As(III) were 69.81 and 94.25 mg/g, respectively (rate Fe:Zr =1:0.5) at pH= 7.0. The adsorption data accorded with Langmuir and Freundlich isotherms. The adsorption of As(III) by Zr- γ-FeOOH was found to be effective in wide pH range of 6–8. Competitive ions hindered the adsorption according to the decreasing sequence phosphate, sulfate, ammonium, chloride, magnesium and calcium. The high adsorptive capability and good performance on other aspects make the Zr-γ- FeOOH nanorods a promissing adsorbent for the removal of As(V) and As(III) from groundwater.

Preparation and Analysis of Magnetic Nanoparticles Used as Highly Active Catalysts over a Wide pH Range

2012 ◽  
Vol 424-425 ◽  
pp. 1057-1061
Author(s):  
Wei Wang ◽  
Tie Long Li ◽  
Ying Liu
Keyword(s):  
Magnetic Nanoparticles ◽  
Precipitation Method ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Ph Adjustment ◽  
Highly Active ◽  
Wide Range ◽  
Iron Leaching ◽  
Wide Ph Range ◽  
Ph Range ◽  
Co Precipitation

In this work, Fe3O4 magnetic nanoparticles with high peroxidase-like catalytic activity and spontaneous pH adjustment ability were successfully prepared by co-precipitation method followed by appropriate thermal treatment. Key synthesis factors were identified and adjusted to tailor the crystallinity, chemical composition and then catalytic property. The crystal structure and Fe (II) content of the catalyst strongly affected its degradation efficiency. Phenol was completely removed by the optimal magnetic nanoparticles under a wide range of pH from 3.0 to 8.0. Additionally, this catalyst exhibited low iron leaching, good reusability and excellent potential to eliminate various organic pollutants from waste water. The reaction mechanism was discussed in terms of the formation of HO• and O2•−/HO2• radicals.

scholarly journals Adsorption of As(V) and As(III) from aqueous solution by lepidocrocite (γ-FeOOH) nanoparticle

2016 ◽  
Vol 19 (4) ◽  
pp. 270-281
Author(s):  
Trung Dinh Nguyen ◽  
Phuong Dong Truong
Keyword(s):  
Adsorption Equilibrium ◽  
Reaction Model ◽  
Precipitation Method ◽  
Second Order Reaction ◽  
High Adsorption ◽  
Freundlich Isotherms ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Co Precipitation

γ-FeOOH nanorods an adsorbent for As(V) and As(III) removal was prepared by a chemical co-precipitation method. The maximum adsorption capacities at pH6 for As(V) and As(III) were 63.75 and 88.99 mg/g, respectively, higher than those of Fe2O3, Fe3O4... The adsorption data accorded with Freundlich isotherms. At the study pH, for arsen, the adsorption equilibrium was gained after 90 min. Kinetic data fitted well to the pseudo-second-order reaction model. The adsorption of γ-FeOOH for As (V) and As(III) could be competed by some other ion such as sulfate, ammonium and chloride. The high adsorption capability and good performance on other aspects make the γ-FeOOH nanorod a promissing adsorbent for the removal of As (V) and As(III) from the groundwater.

scholarly journals Removal of Sb(III) and Sb(V) from aqueous media by goethite

2013 ◽  
Vol 48 (3) ◽  
pp. 223-231 ◽  
Author(s):  
Jianhong Xi ◽  
Mengchang He
Keyword(s):  
Reaction Time ◽  
Thermodynamic Parameters ◽  
Adsorption Process ◽  
Aqueous Media ◽  
Kinetic Studies ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Adsorption Data ◽  
Different Temperatures ◽  
Ph Range

This study investigated the removal of Sb(III) and Sb(V) from aqueous media through their adsorption onto oxide minerals (goethite) under a set of conditions (initial Sb concentration, pH, reaction time, and interaction temperature). The kinetic studies suggested that the adsorption equilibriums for both Sb(III) and Sb(V) were achieved within 24 h. The adsorption data collected at three different temperatures were successfully modeled using both the Langmuir and Freundlich isotherms. The adsorption of Sb(III) onto goethite was greater than that of Sb(V) at the three investigated temperatures. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were calculated from the dependence of the adsorption process on the reaction temperature, and the calculated parameters suggest that the adsorption of both Sb(III) and Sb(V) onto goethite is spontaneously endothermic. The adsorption of Sb(III) and Sb(V) on goethite was dependent on pH within the investigated pH range.

scholarly journals Novel nanostructured Fe–Cu–Al trimetal oxide for enhanced antimony(V) removal: synthesis, characterization and performance

2019 ◽  
Vol 79 (10) ◽  
pp. 1995-2004
Author(s):  
Jianyan Wang ◽  
Jing Chen ◽  
Qiumei Li ◽  
Gaosheng Zhang
Keyword(s):  
Toxic Metal ◽  
Point Of Zero Charge ◽  
Precipitation Method ◽  
Hydroxyl Groups ◽  
Adverse Health Effects ◽  
Ion Exchange Reaction ◽  
Wide Ph Range ◽  
And Performance ◽  
Ph Range ◽  
Co Precipitation

Abstract Given the adverse health effects of antimony (Sb), there is an increased focus on developing methods to remove this toxic metal from contaminated water bodies. To effectively remove Sb(V), a new nanostructured Fe–Cu–Al trimetal oxide was fabricated using co-precipitation method at ambient temperature. The Fe–Cu–Al trimetal oxide was very effective at removing Sb(V) from water; it had a maximal adsorption capacity of 169.1 mg/g at pH 7.0, a capacity that was competitive with most other reported adsorbents. The obtained amorphous oxide had a high pH point of zero charge (pHpzc = 8.8) and good adsorption Sb(V) efficiency over a wide pH range (4.0–8.0). Sb(V) uptake was achieved mainly through an ion-exchange reaction between Sb(V) ions and hydroxyl groups on the surface of the oxide. Given its good removal performance, high selectivity, and simple synthesis, this novel Fe–Cu–Al trimetal oxide offers a promising alternate for removing antimony contamination from aquatic environments.

scholarly journals Evaluation of Fe-Mg Binary Oxide for As (III) Adsorption—Synthesis, Characterization and Kinetic Modelling

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 805
Author(s):  
Saif Ullah Khan ◽  
Rumman Zaidi ◽  
Feroz Shaik ◽  
Izharul Haq Farooqi ◽  
Ameer Azam ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Kinetic Modelling ◽  
Arsenic Concentration ◽  
Experimental Studies ◽  
Precipitation Method ◽  
Arsenic Adsorption ◽  
Adsorbent Dosage ◽  
X Ray ◽  
Co Precipitation ◽  
Contaminated Waters

Nanotechnology has received much attention in treating contaminated waters. In the present study, a facile co-precipitation method was employed to synthesize a novel iron and magnesium based binary metal oxide using a stoichiometrically fixed amount of FeNO3.9H2O and MgNO3.6H2O in a proportion of molar concentration 1:1 and was later evaluated in removing As (III) from contaminated waters. Characterization of the prepared nanomaterial was done using X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive X-Ray Analysis (EDAX) and ultraviolet–visible spectrophotometry (UV-VIS). Experimental studies on batch scale were carried out, examining the effect of varying initial concentrations of metal, adsorbent dosage, application time and initial pH on removal efficiency. Arsenic removal increased on increasing adsorbent dosage (0.1–1 g/L) but trend reversed on increasing initial arsenic concentration attaining qmax of 263.20 mg/g. Adsorption was quite efficient in pH range 4–8. Freundlich fitted better for adsorption isotherm along with following Pseudo-2nd order kinetics. The reusability and effect of co-existing ions on arsenic adsorption, namely SO42−, CO32− and PO43− were also explored with reusability in 1st and 2nd cycles attained adsorptive removal up to 77% and 64% respectively. The prepared nano-adsorbent showed promising results in terms of high arsenic uptake (qmax of 263.20 mg/g) along with facile and cost-effective synthesis. Thus, the co-precipitation technique used in this work is a simple one step procedure without any use of any precursor as compared to most of the other procedures used for synthesis.

Preparation and application of amorphous Fe–Ti bimetal oxides for arsenic removal

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89545-89551 ◽  
Author(s):  
Pinhua Rao ◽  
Zhaowei Sun ◽  
Wenqi Zhang ◽  
Wei Yao ◽  
Luanjiao Wang ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Precipitation Method ◽  
Co Precipitation

A series of Fe–Ti bimetal oxides for As(iii) and As(v) removal were synthesized through a co-precipitation method.

scholarly journals Poly(catechol) modified Fe3O4 magnetic nanocomposites with continuous high Fenton activity for organic degradation at neutral pH

2021 ◽  
Author(s):  
Yani Hua ◽  
Chuan Wang ◽  
Sha Wang ◽  
Juan Xiao
Keyword(s):  
Catalytic Activity ◽  
Fenton Reaction ◽  
Organic Molecules ◽  
Precipitation Method ◽  
Organic Degradation ◽  
Redox Pair ◽  
Iron Leaching ◽  
Acidic Conditions ◽  
Ph Range ◽  
Co Precipitation

Abstract Fe3O4 magnetic nanoparticles (MNPs) have been widely used as a recyclable catalyst in Fenton reaction for organic degradation. However, the pristine MNPs suffer from the drawbacks of iron leaching in acidic conditions as well as the decreasing catalytic activity of organic degradation at a pH higher than 3.0. To solve the problems, Fe3O4 MNPs were modified by poly(catechol) (Fe3O4/PCC MNPs) using a facile chemical co-precipitation method. The poly(catechol) modification improved both the dispersity and the surface negative charges of Fe3O4/PCC MNPs, which are beneficial to the catalytic activity of MNPs for organics degradation. Moreover, the poly(catechol) modification enhanced the efficiency of Fe(II) regeneration during Fenton reaction due to the acceleration of Fe(III) reduction by the phenolic/quinonoid redox pair. As a result, the Fenton reaction with Fe3O4/PCC MNPs could efficiently degrade organic molecules, exampled by methylene blue (MB), in an expanded pH range between 3.0 and 10.0. In addition, Fe3O4/PCC MNPs could be reused up to 8 cycles for the MB degradation with negligible iron leaching of lower than 1.5 mg L-1. This study demonstrated Fe3O4/PCC MNPs are a promising heterogeneous Fenton catalysts for organic degradation.

scholarly journals Adsorption of U(VI) from Aqueous Solution onto Hydrotalcite-Like Compounds

2012 ◽  
Vol 9 (2) ◽  
pp. 669-679 ◽  
Author(s):  
Nguyen Van Suc
Keyword(s):  
Adsorption Capacity ◽  
Enthalpy Change ◽  
Time Dependent ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Equilibrium Data ◽  
Endothermic Process ◽  
Ph Range ◽  
Initial Adsorption ◽  
Hydroxide Hydrate

Uranium adsorption by the synthesized compound of magnesium aluminum hydroxide hydrate – layered double hydrotalcite (STH)-like compounds was studied. The calcinated STH was proven to be a highly effective in U(VI) adsorption in pH range from 6.5 to 7. The time dependent experimental data were found to be fit to the pseudo-second-oder model. The equilibrium data have been modeled using Langmuir and Freundlich isotherms. The results showed that both model provide the best correlation with equilibrium data. The highest adsorption capacity, approximated 62.5 mg/g, was observed in the calcinated STH at 500 °C. The positive value of enthalpy change indicated that adsorption reaction of U(VI) on STH was endothermic process. The regeneration experiments of STH using 0.1M Na2CO3solution was successfully demonstrated multiple times without any significant effect on the initial adsorption capacity.

Immobilization of Salicylic Acid on Ni-Zn Layered Hydroxide Salts

2020 ◽  
Vol 840 ◽  
pp. 566-572
Author(s):  
Muhammad Robith Tahta Amnillah ◽  
Suyanta Suyanta ◽  
Sri Juari Santosa
Keyword(s):  
Salicylic Acid ◽  
Freundlich Isotherm ◽  
Point Of Zero Charge ◽  
Precipitation Method ◽  
Isotherm Models ◽  
Basal Spacing ◽  
X Ray ◽  
Dependent Property ◽  
Ph Range ◽  
Co Precipitation

Ni-Zn Layered hydroxide salt (Ni-Zn LHS) has been synthesized from equimolar Ni(NO3)2 and Zn(NO3)2 by co-precipitation method using NaOH. The formation of layered assembly is confirmed in X-ray diffractogram, i.e. by the appearance of peaks at 2θ: 9.60°, 19.40°, 33.48°, and 59.76° which corresponds to diffraction plane (001), (003), (020), and (040), respectively. The synthesized Ni-Zn LHSs possessed the point of zero charge (pHpzc) at pH 8 and nitrate as the interlamellar ion. The incorporation of salicylic acid into LHS can extend the property of LHS as a reductive adsorbent in the application of metal recovery. The immobilization of salicylic acid on the Ni-Zn-LHS was successfully done and indicated the strong pH-dependent property. The immobilization of salicylic acid on Ni-Zn LHSs was optimum at pH 7 and followed better the Langmuir than Freundlich isotherm models with immobilization capacity 64.93 mg/g. After the immobilization of salicylic acid, the basal spacing of Ni-Zn LHSs did not enlarge indicating that the immobilized salicylic acid was on the outer layer without entering the interlayer and this immobilized salicylic acid was stable at medium pH range 3 to 9.

Study on Fly Ash for Oil-Containing Wastewater Treatment

2013 ◽  
Vol 448-453 ◽  
pp. 1408-1411
Author(s):  
Dan Fu
Keyword(s):  
Wastewater Treatment ◽  
Fly Ash ◽  
Langmuir Isotherm ◽  
Contact Time ◽  
Ph Value ◽  
Adsorption Properties ◽  
Experimental Results ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Adsorption Data

In this paper, the adsorption properties of oil-containing wastewater on Fly Ash （FA）were investigated. The effects of contact time, adsorbent dosage, pH value and the temperature were examined. The equilibrium adsorption data are analyzed using Langmuir and Freundlich isotherms. The Langmuir isotherm fits the experimental results well. The study indicates that FA is a potential adsorbent for oil-containing wastewater treatment.

Sign in / Sign up

Export Citation Format

Share Document