Adsorption of As(III) from aqueous solutions by iron oxide-coated sand

Gupta, Vishu; Saini, Vipin K.; Jain, Neeraj

doi:10.1016/j.jcis.2005.02.054

Cited by 357 publications

(179 citation statements)

References 26 publications

(21 reference statements)

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“…Almost similar uptake have been reported at equilibrium following the Langmuir model for Zeolite (ZME) (González et al 2001), iron oxide-coated/iron oxide-uncoated sand (Gupta et al 2005), and pine wood char (Table 3). Table 2 also represents the kinetic parameters evaluated by fitting the experimental data to pseudo-first-order, pseudosecond-order, and intra-particle diffusion models.…”

Section: Adsorption Isothermssupporting

confidence: 74%

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.

152

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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: Adsorption Isothermssupporting

confidence: 74%

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.

152

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“…IONMs are discussed and tested for the remediation of contaminated groundwater (Cundy et al, 2008) and in wastewater treatment (Xu et al, 2012). As microscale iron oxide particles are known for their adsorption capacity for metal ions (Bailey et al, 1992;Martin et al, 2000;Gupta et al, 2005;Guo et al, 2007;Kundu and Gupta, 2007), increased specific surface area and higher as well as more selective reactivity can be reached by producing the particles in the nanoscale (Madden et al, 2006;Cundy et al, 2008). Those IONMs may even be even generated by anaerobic bacteria (e.g., bio-magnetite; Lloyd, 2003).…”

Section: Emissions and Main Characteristicsmentioning

confidence: 99%

A Review of the Properties and Processes Determining the Fate of Engineered Nanomaterials in the Aquatic Environment

Peijnenburg

Baalousha

Chen

et al. 2015

Critical Reviews in Environmental Science and Technology

177

103

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“…And (2) As retention by iron (hydr)oxides which precipitate just after sulfide oxidation at high pH, as also reported by several authors. [16][17][18][19][20]32 The role of iron oxides in arsenic retention by adsorption or co-precipitation is suggested by several authors 19,[33][34][35][36][37][38][39] and reveal a mechanism of As concentration in the solid phase as the sulfidic samples are oxidized at slightly acid to alkaline medium.…”

Section: Leaching Testsmentioning

confidence: 99%

Arsenic mobilization from sulfidic materials from gold mines in Minas Gerais State

et al. 2008

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Recebido em 21/6/07; aceito em 26/10/07; publicado na web em 15/5/08Acid drainage results from exposition of sulfides to the atmosphere. Arsenopyrite is a sulfide that releases arsenic (As) to the environment when oxidized. This work evaluated the As mobility in six sulfidic geomaterials from gold mining areas in Minas Gerais State, Brazil. Grained samples (<2 mm) were periodically leached with distilled water, during 70 days. Results suggested As sorption onto (hydr)oxides formed by oxidation of arsenopyrite. Low pH accelerated the acid generation, dissolving Fe oxihydroxides and releasing As. Presence of carbonates decreased oxidation rates and As release. On the other hand, lime added to a partially oxidized sample increased As mobilization.Keywords: arsenopyrite; acid mine drainage; contamination. INTRODUCTIONAcid mine drainage (AMD) results from a set of chemical, electrochemical and microbiological reactions, risen from exposure of sulfide bearing geological materials to the atmospheric oxygen and water.1 Under such conditions there is a net generation of sulfuric acid, decreasing pH of the drainage water and increasing solubility and leaching of toxic elements as heavy metals and metalloids.2-4 Consequently, there are increasing risks for toxic metals and metalloids incorporation in biological systems and so, bioaccumulation and biomagnification processes in the trophic chain.Arsenopyrite is a sulfide (AsFeS) commonly found in gold mine areas. 5,6 Its oxidation produces arsenic and sulfur oxiacids (e.g. H 3 AsO 3 , H 3 AsO 4 , H 2 SO 4 ). Arsenic is toxic at low concentrations and sulfuric acid is responsible by the pH drop. 7 The rate of sulfides oxidation depends on several factors, including the amounts of arsenopyrite (e.g. AsFeS), grain size distribution, temperature and the exposure time of the material to the atmospheric water and oxygen. Catalytic action of the Acidithiobacillus aggravates the problem under acid medium, at pH < 3, which stimulates bacterial activity. 8Ingestion of water is considered the main source for As contamination. The most noticeable reports are mass contamination cases that took place in Bangladesh, 9,10 Taiwan 11,12 and Chile. 13 In Brazil, the Iron Quadrangle is one of the affected regions in Minas Gerais State. Most impacted areas are close to gold mines, as in Nova Lima, Raposos, Mariana and Santa Bárbara districts. [14][15][16] Several researchers showed that As adsorption onto iron oxides decreases as the pH increases. [16][17][18][19][20] On the other hand there are reports of increasing As (III) sorption as the pH increases from 3 to the neutral, when the adsorbent is a sulfide as troillite (FeS) or pyrite (FeS 2 ). 21 Release of As from arsenopyrite structure, by oxidation, also decreases at increasing pH, mainly due to the drop of bacterial activity. 8,9 Face to the need for controlling As dispersion in the environment, this research was performed in order to study the mobility of As in samples of sulfidic materials from gold mine areas in different geological sc...

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Adsorption of As(III) from aqueous solutions by iron oxide-coated sand

Cited by 357 publications

References 26 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

A Review of the Properties and Processes Determining the Fate of Engineered Nanomaterials in the Aquatic Environment

Arsenic mobilization from sulfidic materials from gold mines in Minas Gerais State

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