A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John, Y.; David, Victor Emery; Mmereki, Daniel

doi:10.1155/2018/3975948

Cited by 94 publications

(34 citation statements)

References 178 publications

(342 reference statements)

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“…Further, decrease in the % of As(III) removal in the presence of high concentration of CO 3 2− ion could be attributed to the inhibitory adsorption effect of As(III) compared to CO 3 2− on the surface of PNHM/Fe 3 O 4 -40. Alternatively, the possibility of formation of arsenic-carbonate As(CO 3 ) 2− , As(CO 3 )(OH) 2− , and AsCO 3 + complex in the presence of high concentration of CO 3 2− could also account for the observed decrease in arsenic adsorption 63 . In contrast, unaltered selectivity of arsenic in the presence of SO 4 2− (pK b = 7.04) could result in preferential adsorption of AsO 4 3− (pK b = 2.5) on the surface of PNHM/Fe 3 O 4 -40 through hydrogen bonding 64 .…”

Section: Effect Of Co-existing Ions the Various Interfering Anions Imentioning

confidence: 99%

Hollow Polyaniline Microsphere/Fe3O4 Nanocomposite as an Effective Adsorbent for Removal of Arsenic from Water

Dutta

Manna

Srivastava

et al. 2020

Sci Rep

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polyaniline hollow microsphere (pnHM)/fe 3 o 4 magnetic nanocomposites have been synthesized by a novel strategy and characterized. Subsequently, PNHM/Fe 3 o 4-40 (Fe 3 o 4 content: 40 wt.%) was used as an adsorbent for the removal of arsenic (As) from the contaminated water. Our investigations showed 98-99% removal of As(III) and As(V) in the presence of PNHM/Fe 3 o 4-40 following pseudo-second-order kinetics (R 2 > 0.97) and equilibrium isotherm data fitting well with Freundlich isotherm (R 2 > 0.98). The maximum adsorption capacity of As(III) and As(V) correspond to 28.27 and 83.08 mg g −1 , respectively. A probable adsorption mechanism based on X-ray photoelectron spectroscopy analysis was also proposed involving monodentate-mononuclear/bidentate-binuclear As-Fe complex formation via legend exchange. In contrast to NO 3 − and SO 4 2− ions, the presence of PO 4 3− and CO 3 2− co-ions in contaminated water showed decrease in the adsorption capacity of As(III) due to the competitive adsorption. The regeneration and reusability studies of spent PNHM/Fe 3 o 4-40 adsorbent showed ~83% of As(III) removal in the third adsorption cycle. PNHM/Fe 3 o 4-40 was also found to be very effective in the removal of arsenic (<10 μg L −1) from naturally arsenic-contaminated groundwater sample. Arsenic (As) remains one of the major sources of toxic pollutant in groundwater, affecting millions of people throughout the world. It associated into groundwater from several sources of natural and anthropogenic origins. The chronic exposure of arsenic contaminants in water beyond the World Health Organization (WHO) permissible limit (10 µg L −1) results in a serious toxicological and carcinogenic effect on human health 1. It is also widely established that the presence of arsenite [As(III)] in water is more toxic and soluble compared to arsenate [As(V)] 2,3. As a result, several technologies namely, co-precipitation, coagulation, oxidation, ion exchange, adsorption, membrane separation, etc. have been adopted for the treatment of such contaminated water 4,5. However, many conventional and other approaches are not cost-effective and environmental friendly towards arsenic removal selectivity. For example, the precipitation of iron coagulation is cost-effective; however, it generates huge amounts of sludge, leading to secondary pollution problems 6. Similarly, membrane separation exhibits high efficiency but involves high operational cost 6. In this regard, the removal of toxic pollutants from water through adsorption has been receiving considerable attention due to its sludge-free operation, cost-effectiveness, high efficiency/selectivity, ease of use, and reusability facilities 7. Several nanoparticles, such as activated carbon, carbon nanotubes, graphene, manganese oxide, zinc oxide, titanium oxide, and ferric oxides emerged as effective nanoadsorbents give better performance compared to other conventional adsorbents in removal of arsenic, phosphate, selenium and nitrite anions, and other heavy metals from drinking water 8-13. In this co...

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Section: Effect Of Co-existing Ions the Various Interfering Anions Imentioning

confidence: 99%

Hollow Polyaniline Microsphere/Fe3O4 Nanocomposite as an Effective Adsorbent for Removal of Arsenic from Water

Dutta

Manna

Srivastava

et al. 2020

Sci Rep

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“…Surface area, pore size and morphology analysis: Granular activated carbon (GAC) was subjected to pore size distribution and surface area analysis. BET-surface area of GAC was found to be 998 m 2 /g, the particle density 0.7950 g/ cm 3 , pore volume 0.825 cm 3 /g and the pore diameter less than 20 AU was observed.…”

Section: Resultsmentioning

confidence: 90%

“…The phenomenon of adsorption is most widely employed for separation, treatment of waste effluent, refrigeration, environmental pollution control, etc. [1][2][3]. Organic compounds such as aniline, benzoic acid, aldehydes, etc.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Equilibrium and Kinetic Studies of Effect of ortho-Substitution to Benzoic Acid in Aqueous Phase Using Granular Activated Carbon

George¹

2019

Asian J. Chem.

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Adsorption equilibrium and kinetics studies of effect of ortho-substituted benzoic acid in aqueous phase using granular activated carbon were investigated. The granular activated carbon (GAC) obtained from bituminous type coal having a surface area of 998 m 2 /g and loosely bounded and open pores morphology. The adorbates selected for this study was benzoic acid and its ortho-derivatives namely; salicylic acid, phthalic acid and o-toluic acid. The solubility of adsorbate in solvent affected the adsorption behaviour more pronouncly. The order of adsorption for adsorbates was found to be as: benzoic acid > salicylic acid > o-toluic acid > phthalic acid.

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“…Among various arsenic absorbents, iron oxide is one of the most promising adsorbents because it exhibits selective affinity for arsenic ions and is a very cheap material that is abundant in nature. Therefore, iron oxide may be a very effective alternative for domestic water treatment when used as an adsorbent in a filtration system [12,13]. Much research has been done on iron-oxide-modified media, including iron-oxide-coated zeolite [14], cement [15], carbon nanotubes (CNTs) [16], activated carbon [17], biomasses [18], activated alumina [19], and polymers, for arsenic removal [20].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional, printed water-filtration system for economical, on-site arsenic removal

Kim¹,

Ratri²,

Choe³

et al. 2020

PLoS ONE

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The threat of arsenic contamination to public health, particularly in developing countries, has become a serious problem. Millions of people in their daily lives are still highly dependent on groundwater containing high levels of arsenic, which causes excessive exposure to this toxic element, due to the high cost and lack of water-treatment infrastructures. Therefore, a technique for large-scale treatment of water in rural areas to remove arsenic is needed and should be low-cost, be easily customized, and not rely on electrical power. In this study, in an effort to fulfill those requirements, we introduce a three-dimensional (3D), printed water-filtration system for arsenic removal. Three-dimensional printing can provide a compact, customized filtration system that can fulfill the above-mentioned requirements and that can be made from plastic materials, which are abundant. Armed with the versatility of 3D printing, we were able to design the internal surface areas of filters, after which we modified the surfaces of the 3D, printed filters by using iron (III) oxide as an adsorbent for arsenite. We investigated the effects of the controlled surface area on the flow rate and the deposition of the adsorbent, which are directly related to the adsorption of arsenic. We conducted isotherm studies to quantify the adsorption of arsenic on our 3D, printed filtration system.

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A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Cited by 94 publications

References 178 publications

Hollow Polyaniline Microsphere/Fe3O4 Nanocomposite as an Effective Adsorbent for Removal of Arsenic from Water

Hollow Polyaniline Microsphere/Fe3O4 Nanocomposite as an Effective Adsorbent for Removal of Arsenic from Water

Adsorption Equilibrium and Kinetic Studies of Effect of ortho-Substitution to Benzoic Acid in Aqueous Phase Using Granular Activated Carbon

Three-dimensional, printed water-filtration system for economical, on-site arsenic removal

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