The Sorption of Arsenic onto Activated Carbon Impregnated with Metallic Silver and Copper

Rajaković, Ljubinka V.

doi:10.1080/01496399208019434

Cited by 87 publications

(35 citation statements)

References 5 publications

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“…Hence, its uptake at high pH would be obviously low (Pattanayak et al 2000). Physical adsorption was mainly responsible for the As(III) adsorption onto raw PC biochar, while chemisorption played additional role for As(III) adsorption onto Zn-loaded PC biochar (Rajakovic 1992) (Fig. 5).…”

Section: Effect Of Ph On Adsorptionmentioning

confidence: 99%

“…5). It has been reported that H 3 AsO 3 and H 2 AsO 3 -are the predominant As(III) species available in the aqueous solution in the pH range of 4 to 9.5 (Rajakovic 1992;Ayoob et al 2007;Mondal et al 2007). Both the surfaces of raw and Zn-loaded PC biochars were positively charged up to their pH PZC value of 4.66 and 4.03, respectively, and the adsorption primarily occurred through the electrostatic attractions between the neutral/negative arsenic species and positively charged biochar surface.…”

Section: Effect Of Ph On Adsorptionmentioning

confidence: 99%

“…The mixture was stirred at room temperature (25°C) for 12 h. After filtration and washing, the Zn-loaded PC biochar was dried in an oven at 110°C overnight. More details of impregnation method are available elsewhere (Rajakovic 1992;Ning et al 2013). …”

Section: Preparation Of Raw and Zn-loaded Pc Biocharmentioning

confidence: 99%

“…Among them, adsorption process is cost-effective, flexible, and easy to design and operate. Several types of absorbent including iron-containing granular activated carbon (GAC) (Gu et al 2005), iron-containing fly ash (Yi et al 2009), iron-impregnated AC (Ghanizadeh et al 2010;Vaughan and Reed 2005), zirconium-loaded AC (Daus et al 2004;Peraniemi et al 1994), silver and copperimpregnated AC (Rajakovic 1992), and zinc-preloaded magnetite nanoparticle (Yang et al 2010) have been used for the removal of arsenic from the water/wastewater system. In order to enhance the process economy, the production of adsorbents from low-cost renewable biomass is usually encouraged as the surface modification of these adsorbents can further enhance the adsorptive removal of toxicants.…”

Section: Introductionmentioning

confidence: 99%

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Arsenic(III) removal from aqueous solution by raw and zinc-loaded pine cone biochar: equilibrium, kinetics, and thermodynamics studies

Vinh

Zafar

Behera

et al. 2014

Int. J. Environ. Sci. Technol.

157

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The potential of raw pine cone (PC) biochar and its modified form (Zn-loaded biochar) was evaluated for the removal of trivalent arsenic [As(III)] from the aqueous solution. The influence of treatment of PC biochar with Zn(NO 3 ) 2 on the physico-chemical properties of biochar was examined using elemental analyzer, surface area analyzer, thermo-gravimetric analyzer, Fourier transform infrared spectroscopy, and scanning electron microscopy. Experimental results revealed that the removal of As(III) was almost consistent (66.08 ± 3.94 and 87.62 ± 3.88 % on raw and Zn-loaded biochar, respectively) over an acidic pH range of 2-4 as a consequence of high affinity between the positively charged biochar surface and the predominant arsenic species (H 3 AsO 3 and H 2 AsO 4 -), followed by a decrease with increase in pH in the range of 4-12. Langmuir isotherm model was well fitted to the experimental equilibrium data (R 2 = 0.93) rendering the maximum adsorption capacity of 5.7 and 7.0 lg g -1 on raw and Znloaded PC biochar, respectively. The adsorption of As(III) was well represented by pseudo-second order with reaction rate constant (k 2 ) of 0.040 and 0.282 mg g -1 min on raw and zinc-loaded PC biochar, respectively, and was mainly controlled by boundary layer diffusion followed by some extent of intra-particle diffusion. The adsorption process was spontaneous with Gibb's free energy (DG°, -4.42 ± 0.72 and -11.86 ± 1.78 kJ mol -1 ) and exothermic in nature with enthalpy (DH°, 13.25 and 31.10 kJ mol -1) and entropy (DS°, 0.058 and 0.141 kJ mol -1 K -1 ) for raw and zinc-loaded adsorbent, respectively.

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Section: Effect Of Ph On Adsorptionmentioning

confidence: 99%

Section: Effect Of Ph On Adsorptionmentioning

confidence: 99%

Section: Preparation Of Raw and Zn-loaded Pc Biocharmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Arsenic(III) removal from aqueous solution by raw and zinc-loaded pine cone biochar: equilibrium, kinetics, and thermodynamics studies

Vinh

Zafar

Behera

et al. 2014

Int. J. Environ. Sci. Technol.

157

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“…Various adsorption materials have been used such as activated carbon, activated alumina, iron hydroxides and lanthanum compounds [12][13][14][15]. According to previous studies, hydrated iron(II-III) has a high affinity toward arsenic oxyanions and it is very selective in the sorption process [16].…”

Section: Introductionmentioning

confidence: 99%

An effective adsorbent developed from municipal solid waste and coal co-combustion ash for As(V) removal from aqueous solution

Fan

Zhang

Yong³

2008

Journal of Hazardous Materials

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a b s t r a c tA new adsorbent was developed from waste ash resulting from municipal solid waste and coal cocombustion power plant. The ash was firstly subjected to hydrothermal treatment for zeolite synthesis, and then modified with iron(II) ions by agitation (ISZ) or ultrasonic (UISZ) treatment. The effect of operating factors such as pH, contact time, initial As(V) concentration and adsorbent dosage was investigated and the optimum operating conditions were established. The adsorption capacity for As(V) onto UISZ and ISZ were 13.04 and 5.37 mg g −1 , respectively. The adsorption isotherm data could be well described by Langmuir isotherm model. The optimum initial pH values for As(V) removal were 2.5 and 2.5-10.0 by ISZ and UISZ, respectively. The results indicated that ultrasound treatment scattered the particles of the adsorbent uniformly, which was in favor of impregnating iron ions into pores. Leaching of hazardous elements from the used adsorbents was very low. Accordingly, it is believed that the adsorbents developed in this study are environmentally acceptable and industrially applicable for utilization in arsenic-containing wastewater treatment.

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Waste Treatment and Remediation Technologies for Arsenic

Henke

2009

Arsenic

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The Sorption of Arsenic onto Activated Carbon Impregnated with Metallic Silver and Copper

Cited by 87 publications

References 5 publications

Arsenic(III) removal from aqueous solution by raw and zinc-loaded pine cone biochar: equilibrium, kinetics, and thermodynamics studies

Arsenic(III) removal from aqueous solution by raw and zinc-loaded pine cone biochar: equilibrium, kinetics, and thermodynamics studies

An effective adsorbent developed from municipal solid waste and coal co-combustion ash for As(V) removal from aqueous solution

Waste Treatment and Remediation Technologies for Arsenic

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