Effect of pre-oxidation for introduction of nitrogen containing functional groups into the structure of activated carbons and its influence on Cu (II) adsorption

Kasnejad, Mohammad Hasan; Esfandiari, Ali; Kaghazchi, Tahereh; Asasian, Neda

doi:10.1016/j.jtice.2012.02.006

Cited by 58 publications

(15 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The last cited authors reported that an activated carbon with a high amount of carboxylic groups and low pH pzc is an effective adsorbent of heavy metals. The diverse characteristics of activated carbon are incorporated by physical or chemical activation and depend on the type of precursor, activation conditions, activation agent, and mode (Kasnejad et al 2012;Ceyhan et al 2013). Furthermore, the non-uniform adsorption sites in AC provide complex and varied interactions during the adsorption process .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous adsorption behavior of heavy metals onto microporous olive stones activated carbon: analysis of metal interactions

Bohli

Ouederni

Villaescusa

2017

Euro-Mediterr J Environ Integr

View full text Add to dashboard Cite

The present work reports the synergistic and inhibitory adsorption effects involved in the multicomponent adsorption of heavy metal ions (Cu(II), Ni(II), and Cd(II)) from binary systems using chemically olive stone activated carbon (COSAC) as adsorbent. In order to evaluate the adsorption capacity of COSAC to remove studied heavy metals, adsorption of metal ions in single and binary systems were conducted. Kinetics adsorption rates in binary systems are very fast as compared to that in single ones and well represented by the pseudo second-order. Langmuir and Sips model fit mono-solute adsorption isotherms and the maximum adsorption capacity of COSAC decreased in the following order: Cd(II) [ Ni(II) [ Cu(II). In binary equilibrium systems, the effect of initial concentration of interfering metal ions on the removal of target ones was studied. Different mutual interactions between metal ions dealing with the decrease and the enhancement of inhibitory and synergetic effects were detected. Results showed that the effects on the adsorption of the metal ions in binary mixture strongly depend on the initial concentration of both metal ions in the solution. In most of the scenarios studied, the total amount of metal ions adsorbed was higher than the sum of the ones obtained in single solutions, suggesting synergetic interactions between the two metal ions. This study proves that COSAC is an effective adsorbent for the removal of heavy metals from multicomponent solutions.

show abstract

Section: Introductionmentioning

confidence: 99%

Simultaneous adsorption behavior of heavy metals onto microporous olive stones activated carbon: analysis of metal interactions

Bohli

Ouederni

Villaescusa

2017

Euro-Mediterr J Environ Integr

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

“…13 Currently ACs have been extensively utilized and modified by numerous methods to change their structure and surface nature to remove such other contaminants as bulky and polar dye molecules, 4 heavy metal ions, 5,6 and anionic nitrate ions. 7 For the removal of cationic heavy metal ions, a negatively charged surface is required; one is a basic site generated by introducing basic nitrogen and oxygen groups on the carbon surface and π-electrons in hydrophobic graphite layers, on the contrary the other is an acidic site such as carboxy groups in which cationic heavy metals are effectively adsorbed via ion-exchange with protons of carboxy groups on the hydrophilic carbon surface, and the ion-exchange mechanism has been supported in the literature.…”

mentioning

confidence: 99%

“…10,12 Kasnejad et al found that Cu(II) adsorption was increased as much as 3.1 mmol g ¹1 at equilibrium aqueous solution pH about 6 for a commercial activated carbon modified by NH 3 after preoxidation with HNO 3 . 13 Rangel-Mendez and Streat examined the effect of electrochemically oxidized activated carbon cloth made from polyacrylonitrile on Cd(II) adsorption and adsorption of 1.2 mmol g ¹1 could be achieved in solution pH above 5 at the expense of the reduction of specific surface area of AC by 35%.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Adsorptive Removal of Pb(II) Ions from Aqueous Solution by (NH4)2S2O8 Oxidized Activated Carbons

Machida

Shimeng

Amano

et al. 2014

Bulletin of the Chemical Society of Japan

View full text Add to dashboard Cite

A commercially available activated carbon (AC) was oxidized using 1 M H 2 SO 4 solution containing 2 M (NH 4 ) 2 S 2 O 8 oxidant with the solution to carbon ratio of 50 cm 3 g ¹1 by changing oxidation period ranging 1 to 10 days at ambient temperatures of 20 or 30°C to introduce carboxy groups onto the carbon surface to capture Pb(II) ions. Adsorptive removal of Pb(II) ions from aqueous solution was also examined with the oxidized ACs. The Pb(II) ion adsorption progressed via ion exchange with protons of carboxy groups bound to graphite and 2.2 mmol g ¹1 of Pb(II) could be accommodated at equilibrium pH above 4.0 for ACs oxidized for at least 10 days at 20°C and 4 days at 30°C. Decrease in specific surface area and yield and increase in oxygen and hydrogen content in ACs also observed during the (NH 4 ) 2 S 2 O 8 treatment implied that the oxidation could convert graphite sheets to smaller size by hydrolysis while many carboxy groups would be introduced to the peripherals of the graphite sheets to scavenge Pb(II) ions.Activated carbons (ACs) have long been widely applied for water purification to principally remove organic pollutants such as phenol and nitrobenzene utilizing their hydrophobic nature on the carbon surface. 13 Currently ACs have been extensively utilized and modified by numerous methods to change their structure and surface nature to remove such other contaminants as bulky and polar dye molecules, 4 heavy metal ions, 5,6 and anionic nitrate ions.7 For the removal of cationic heavy metal ions, a negatively charged surface is required; one is a basic site generated by introducing basic nitrogen and oxygen groups on the carbon surface and π-electrons in hydrophobic graphite layers, on the contrary the other is an acidic site such as carboxy groups in which cationic heavy metals are effectively adsorbed via ion-exchange with protons of carboxy groups on the hydrophilic carbon surface, and the ion-exchange mechanism has been supported in the literature.811 Hydroxy, lactone, and other oxygen functional groups, however, did not contribute to heavy metals adsorption very much particularly in acidic and neutral aqueous solution in our previous study. 9 Comparing to basic sites such as amino-groups and π-electrons, acidic carboxy sites adsorb heavy metal cations over a wide pH range from 4 to above 7 although basic sites work in basic solutions above pH 8, thereby increasing carboxy groups is one strategy to enhance the uptake of heavy metal cations.10,12 Kasnejad et al. found that Cu(II) adsorption was increased as much as 3.1 mmol g ¹1 at equilibrium aqueous solution pH about 6 for a commercial activated carbon modified by NH 3 after preoxidation with HNO 3 .13 Rangel-Mendez and Streat examined the effect of electrochemically oxidized activated carbon cloth made from polyacrylonitrile on Cd(II) adsorption and adsorption of 1.2 mmol g ¹1 could be achieved in solution pH above 5 at the expense of the reduction of specific surface area of AC by 35%.14 In this study, ammonium persulfate was used as an oxidant...

show abstract

“…The adsorption of Zn(II) increased but surface area and carbon porosity decreased after oxidation under static conditions [17] Making acidic oxygen functional groups into activated carbon by HNO 3 oxidation…”

Section: Treatment Step Effect Referencementioning

confidence: 99%

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

Zhou

Wang

Hursthouse

et al. 2018

Water

View full text Add to dashboard Cite

Gemini surfactants, with double hydrophilic and hydrophobic groups, offer potentially orders of magnitude greater surface activity compared to similar single unit molecules. A cationic Gemini surfactant (Propyl didodecyldimethylammonium Bromide, PDDDAB) and a conventional cationic surfactant (Dodecyltrimethylammonium Bromide, DTAB) were used to pre-treat and generate activated carbon. The removal efficiency of the surfactant-modified activated carbon through adsorption of chromium(VI) was investigated under controlled laboratory conditions. Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to investigate the surface changes of surfactant-modified activated carbon. The effect of important parameters such as adsorbent dosage, pH, ionic strength and contact time were also investigated. The chromium(VI) was adsorbed more significantly on the Gemini surfactant-modified activated carbon than on the conventional surfactant-modified activated carbon. The correlation coefficients show the data best fit the Freundlich model, which confirms the monolayer adsorption of chromium(VI) onto Gemini surfactant-modified activated carbon. From this assessment, the surfactant-modified (especially Gemini surfactant-modified) activated carbon in this study showed promise for practical applications to treat water pollution.

show abstract

Effect of pre-oxidation for introduction of nitrogen containing functional groups into the structure of activated carbons and its influence on Cu (II) adsorption

Cited by 58 publications

References 34 publications

Simultaneous adsorption behavior of heavy metals onto microporous olive stones activated carbon: analysis of metal interactions

Simultaneous adsorption behavior of heavy metals onto microporous olive stones activated carbon: analysis of metal interactions

Adsorptive Removal of Pb(II) Ions from Aqueous Solution by (NH4)2S2O8 Oxidized Activated Carbons

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

Contact Info

Product

Resources

About