Adsorptive removal of heavy metals from water using sodium titanate nanofibres loaded onto GAC in fixed-bed columns

Sounthararajah, Danious Pratheep; Loganathan, P.; Kandasamy, Jaya; Vigneswaran, S.

doi:10.1016/j.jhazmat.2015.01.067

Cited by 134 publications

(56 citation statements)

References 43 publications

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“…And, the optimum pH value of Cu (II) uptake was the sequence of mHLG2 (about 5) < mHLG1 (about 5.5) < mHLG3 (about 5.7). Sounthararajah et al (2015) claimed that the competition between protons and metal ions for the same binding sites was responsible for the sorption behavior at low pH values. But, the competition effect of protons could be equitable for the initial and modified HLG, because Cu mainly existed as free Cu (II) ion at pH values less than 6.0, and as Cu 2 (OH) 2 2+ (aq) or CuOH + (aq) at pH values above 6.0 (Sylva, 1976).…”

Section: The Change Of Sorption Behaviorsmentioning

confidence: 99%

Effect of H2O2 concentrations on copper removal using the modified hydrothermal biochar

Zuo

Liu

Chen

2016

Bioresource Technology

106

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h i g h l i g h t s) > mHLG0 (35.8 mg g À1 ), which was higher than the results from majority of previous studies, suggesting that H 2 O 2 modification advanced sorption capacity of hydrothermal biochars evidently. Effect mechanisms exploration indicated that the difference of Cu (II) removal by biochars before and after the modification was mainly related to functional groups. Carboxylic group was responsible for the best sorption property of Cu (II) by mHLG2, which was attributed to its significant relationships with H 2 O 2 modification and Cu (II) removal.

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Section: The Change Of Sorption Behaviorsmentioning

confidence: 99%

Effect of H2O2 concentrations on copper removal using the modified hydrothermal biochar

Zuo

Liu

Chen

2016

Bioresource Technology

106

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“…Current techniques make use of nanoparticles or composite materials for remediation of heavy metals in water. Nevertheless, almost all approaches rely on the functionalization of nanoparticles with different reactive groups or loading nanostructures on supporting materials to provide them, with the capability of capturing the heavy metals [18][19][20][21]. Besides all these preparation techniques are complex.…”

Section: Chemical and Physical Analysesmentioning

confidence: 99%

Synthesis of Multicomponent Nanoparticles for Immobilization of Heavy Metals in Aqueous Phase

Flores

Debut

Stael³

2016

NanoWorld J

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This study is focused on the preparation of multicomponent nanoparticles (MCNPs) used to remediate artificial and real mine tailings. The nanoparticles were synthesized with 0.035 M or 0.007 M of sodium sulfate, 0.5 M of iron chloride and 0.8 M of sodium borohydride. Characterization of nanoparticles performed with a Transmission Electron Microscope (TEM), X-ray diffractometer (XRD), Fourier Transform Infrared Spectrometer (FTIR), and X-ray Photoelectron Spectrometer (XPS) demonstrated, these materials are in the nanoscale range, contain zero valent iron Fe(0) and iron sulfide (FeS) and are structurally modified after treatment. Simultaneous removal of heavy metals was carried out under oxidizing and reducing conditions using MCNPs reaching an efficiency of more than 98% for all of them. Kinetics conducted under oxidizing condition, pH 3 and 0.035 M sodium sulfate shows that the highest removal of heavy metals from artificial mine tailings was achieved after 160 min of treatment although steady state was reached in 240 mins. Results of kinetic tests fit very well to a pseudo-second-order model, while the isothermal equilibrium adsorption tests were adjusted to a Freundlich isotherm. Also, nanoparticles showed a high adsorption capacity (~140 mg/g) when they were in contact with 200 mg Cu 2+ /L. Finally, multicomponent nanoparticles tested with real mine tailings in the presence of other competing chemicals results in heavy metals removal over 90%.

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“…Current techniques make use of nanoparticles or composite materials for remediation of heavy metals in water. Nevertheless, almost all approaches rely on the functionalization of nanoparticles with different reactive groups or loading nanostructures on supporting materials to provide them, with the capability of capturing the heavy metals [12][13][14][15]. Treatment of artificial mine tailings with MCNPs has achieved removals higher than 99.00% for Pb, Zn, Ag, Cu, As and Ni when using a standardized laboratory procedure [16].…”

Section: Introductionmentioning

confidence: 99%

Optimized Synthesis of Multicomponent Nanoparticles for Removing Heavy Metals from Artificial Mine Tailings

Stael¹,

Cumbal²

2016

Biol Med (Aligarh)

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Treatment of artificial mine tailings with multicomponent nanoparticles (MCNPs) has reached removals higher than 99.00% for Pb, Zn, Ag, Cu, As and Ni using a standardized laboratory procedure. However, it is believed that the amount of reactants can be optimized and make it a profitable technique. In this study, the amount of NaBH4 and FeCl 3 was reduced in 90.00% and in 99.50%, respectively, without affecting the removal of heavy metals from the artificial mine tailings. This new procedure utilized only 25 mL of 1.0 mM FeCl 3 , 25 mL of 0.7 mM Na 2 SO 4 and 3 mL of 0.8M NaBH 4 prepared with nitrogenized water. Size and spherical shape of nanoparticles obtained with Transmission Electron Microscopy showed no difference compared to the particles prepared with the former procedure. Also, removals of Cu, Zn, Ni in 5 minutes were higher than 99.50%. Thus an enhanced procedure for fabrication of the multicomponent nanoparticles was developed. This procedure moreover of achieving an excellent removal of heavy metals may end up as a profitable remediation technique.

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Adsorptive removal of heavy metals from water using sodium titanate nanofibres loaded onto GAC in fixed-bed columns

Cited by 134 publications

References 43 publications

Effect of H2O2 concentrations on copper removal using the modified hydrothermal biochar

Effect of H2O2 concentrations on copper removal using the modified hydrothermal biochar

Synthesis of Multicomponent Nanoparticles for Immobilization of Heavy Metals in Aqueous Phase

Optimized Synthesis of Multicomponent Nanoparticles for Removing Heavy Metals from Artificial Mine Tailings

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