Preparation of iron-impregnated granular activated carbon for arsenic removal from drinking water

Chang, Qigang; Lin, Wei; Ying, Weiyong

doi:10.1016/j.jhazmat.2010.08.066

Cited by 185 publications

(68 citation statements)

References 29 publications

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“…The relationship of the electrostatic force between As(V) ions and α-Fe 2 O 3 explains the influence of pH on As(V) sorption. This has been well described in previous studies concerning As(V) sorption on other adsorbents (Zhu et al, 2009;Chang et al, 2010;Sheng et al, 2012). …”

Section: Effect Of Phsupporting

confidence: 85%

“…Consequently, higher concentrations of α-Fe 2 O 3 revealed a passive effect on the photocatalytic degradation of MB. The available active sites increased with increasing amount of α-Fe 2 O 3 ; however, the photoactivated volume of solution and the light penetration shrank (Chang et al, 2010). It can also be attributed to the increased opacity of the suspension bringing a shielding effect and light scattering (Chang et al, 2010).…”

Section: 32mentioning

confidence: 99%

“…5b. As the solution pH increases from an acidic region to an alkaline region, As(V) ions in solution exist mainly as H 3 AsO 4 at pH<2.2 (pK a1 ), H 2 AsO 4 − at pH 2.2-6.98 (pK a2 ), HAsO 4 2− at pH 6.98-11.5 (pK a3 ), and AsO 4 3− at pH>11.5 (Zhu et al, 2009;Chang et al, 2010). When the pH is below the isoelectric point of α-Fe 2 O 3 , the surface of α-Fe 2 O 3 will be positively charged and favorable for As(V) sorption.…”

Section: Effect Of Phmentioning

confidence: 99%

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Synthesis of flower-like α-Fe2O3 and its application in wastewater treatment

Xie

Wang

Liu

et al. 2014

J. Zhejiang Univ. Sci. A

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Abstract:The removal of arsenic from aqueous solution is crucial to human health and environmental pollution. Herein, flower-like α-Fe 2 O 3 nanostructures were synthesized via a template-free microwave-assisted solvothermal technique, and were applied as adsorbents for the removal of arsenic (As(V)) from aqueous solutions. The results indicated that the synthesized flower-like α-Fe 2 O 3 showed excellent sorption properties and had a maximum sorption capacity of 47.64 mg/g for As(V). Meanwhile, the experimental results of photodegradation of methylene blue (MB) indicated that the as-synthesized flower-like α-Fe 2 O 3 exhibited very high photocatalytic performance for the photodegradation of MB and that the as-obtained flower-like α-Fe 2 O 3 nanostructures were suitable materials in wastewater treatment.

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Section: Effect Of Phsupporting

confidence: 85%

Section: 32mentioning

confidence: 99%

Section: Effect Of Phmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of flower-like α-Fe2O3 and its application in wastewater treatment

Xie

Wang

Liu

et al. 2014

J. Zhejiang Univ. Sci. A

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“…Arsenate species in aqueous phase exist mainly as H 3 AsO 4 at pH less than 2.2, H 2 AsO 4 -at pH between 2.2 and 6.98, HAsO 4 2-at pH between 6.98 and 11.5, and AsO 4 3-at pH above 11.5. The surface charge of the adsorbents becomes more positively charged when pH is less than pH pzc and more negatively charged when pH is above pH pzc [22]. A better performance of the adsorption occurred at acidic condition can be interpreted that the more positive charge of the adsorbents (pH< pH pzc ) provided more adsorption sites for the predominant arsenate species (H 2 AsO 4 -or HAsO 4 -).…”

Section: B Effect Of Phmentioning

confidence: 99%

“…Arsenate species and the surface charge of the adsorbent in aqueous solution are pH dependent, which make pH be one of the most important factors affecting arsenate adsorption onto the adsorbent in the liquid phase [22]. The effect of pH on arsenate adsorption onto raw clay and modified clays is shown in Fig.…”

Section: B Effect Of Phmentioning

confidence: 99%

Modification of Natural Common Clays as Low Cost Adsorbents for Arsenate Adsorption

Te¹,

Wichitsathian²,

Yossapol³

2015

IJESD

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Abstract-In this study, natural common clays were used as raw materials to be modified with ferric and ferrous solutions to develop improved efficient and low cost adsorbents. The adsorbents (Raw Clay, Clay/FeSO 4 , and Clay/FeCl 3 ) were investigated for arsenate removal from synthetic aqueous solution in batch studies with respect to contact time, solution pH, initial As(V) concentration, and temperature. The results showed that As(V) uptake was pH dependent and the high efficiency occurred in the acidic condition. The adsorption kinetic data were fitted well with the pseudo second order adsorption model. The estimated maximum adsorption capacity from Langmuir model was 0.44, 1.50, and 0.86 mg/g for Raw Clay, Clay/FeSO 4 , and Clay/FeCl 3 , respectively. The values of a dimensionless constant separation factor (R L ) and the magnitude of the adsorption intensity (1/n) showed that As(V) was adsorbed favorably on all adsorbents. The thermodynamic parameters indicated that the adsorption is spontaneous and endothermic and an irregular increase of the randomness at the adsorbent-adsorbate interface during the adsorption.

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Nanotechnology for Detection and Removal of Heavy Metals From Contaminated Water

Bhagat

Giri

2021

Functionalized Nanomaterials for Catalytic Application

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Preparation of iron-impregnated granular activated carbon for arsenic removal from drinking water

Cited by 185 publications

References 29 publications

Synthesis of flower-like α-Fe2O3 and its application in wastewater treatment

Synthesis of flower-like α-Fe2O3 and its application in wastewater treatment

Modification of Natural Common Clays as Low Cost Adsorbents for Arsenate Adsorption

Nanotechnology for Detection and Removal of Heavy Metals From Contaminated Water

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