Arsenate sorption on schwertmannite

Fukushi, Keisuke; Satō, Tsutomu; Yanase, Nobuyuki; Minato, Junichi; Yamada, Hirohisa

doi:10.2138/am-2004-11-1219

Cited by 91 publications

(68 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Further, the value similar to that in previously work [21]. During the adsorption process, the The schwertmannite has positive and negative potentials at pH less and more than 7.…”

Section: Oxyanion Adsorption Experimentssupporting

confidence: 89%

Adsorption and Post Adsorption Behavior of Schwertmannite with Various Oxyanions

Khamphila¹,

Kodama²,

Satō³

et al. 2017

JMMCE

Self Cite

View full text Add to dashboard Cite

The adsorption and post adsorption behavior of schwertmannite with various oxyanions were investigated for clean-up contaminated water with hazardous oxyanions and safe disposal of spent schwertmannite. The result of adsorption experiments showed that the maximum capacities of oxyanions adsorption onto schwertmannite are 1.023, 0.934, 0.723 and 0.313 mmol/g for arsenate, phosphate, chromate and selenate, respectively. Based on the differences in the adsorption capacities, the selectivity of oxyanion adsorption on schwertmannite decreases as the order: arsenate ≥ phosphate > chromate >> selenate. Change in the Zeta potential after adsorption by arsenate, phosphate and chromate were very different from those after adsorption by selenate and of the original schwertmannite. This difference implies that the adsorption mechanism on schwertmannite with arsenate, phosphate and chromate is different from that with selenate and sulfate. Arsenate, phosphate, and chromate ions form inner-sphere complexes with the surface of schwertmannite, while selenate and sulfate ions form outer-sphere complexes with the surface of schwertmannite. Based on a comparison with anion adsorption, strong base anions form inner-sphere complexes, which induce a strong adsorption with schwertmannite as well as it is conducive to high adsorption capacity. From the results of aging experiments, schwertmannite with sulfate and selenate changed to a more stable phase, goethite, in a short time, whereas there is no change in the XRD patterns of schwertmannite with arsenate and phosphate after 30 days. The stability of schwertmannite after the adsorption increased in the following order: sulfate ≅ selenate  chromate < phosphate ≅ arsenate. The solubility of schwertmannite with different oxyanions was calculated according to solid solution theory. The solubility of schwertmannite decreased after adsorption of oxyanions with high selectivity. It is concluded that oxyanions with high selectivity can stabilize schwertmannite by decreasing the solubility of the schwertmannite after adsorption of the oxyanions.

show abstract

“…Further, the value similar to that in previously work [21]. During the adsorption process, the The schwertmannite has positive and negative potentials at pH less and more than 7.…”

Section: Oxyanion Adsorption Experimentssupporting

confidence: 89%

Adsorption and Post Adsorption Behavior of Schwertmannite with Various Oxyanions

Khamphila¹,

Kodama²,

Satō³

et al. 2017

JMMCE

Self Cite

View full text Add to dashboard Cite

show abstract

“…21) It was reported by many authors that the sulfate groups could be replaced by others anions as 24) have demonstrated that reactive sites on schwertmannite are coordinated SO 4 groups rather than surface hydroxyl groups. Equation (10) tells that the negative PO 4 ions are only dominant at high pH values and increase with increasing pH values in the solution.…”

Section: The Effect Of Ph On Phosphate Adsorptionmentioning

confidence: 99%

Magnetic Removal of Phosphate from Wastewater Using Schwertmannite

et al. 2006

View full text Add to dashboard Cite

A magnetic filtration has firstly been applied to the phosphate removal from wastewater by using schwertmannite, which is ferric oxyhydroxide sulfate with high capacity of phosphate adsorption. High efficiency of phosphate removal without using magnetic seeding was obtained at magnetic intensities of around 1 Tesla, which means no necessity to use a superconducting magnet. The kinetics data of phosphate adsorption have been found to be fitted well with a pseudo-second-order model and adsorption equilibrium data have been explained by the Langmuir isotherm. The effect of pH on the phosphate adsorption in this process was characterized by zeta potential measurement. It is proposed that ligand exchange is a dominant mechanism responsible for phosphate adsorption on schwertmannite.

show abstract

“…Various elements can be adsorbed from solution onto schwertmannite [47][48][49]. Schwertmannite is poorly crystalline and unstable and transforms to either goethite (reaction (4)) [45,50] or jarosite (reaction (5)) [51,52].…”

Section: Mineral Dissolution In Acidic Environmentsmentioning

confidence: 99%

Review of Biohydrometallurgical Metals Extraction from Polymetallic Mineral Resources

Watling

2014

Minerals

137

View full text Add to dashboard Cite

This review has as its underlying premise the need to become proficient in delivering a suite of element or metal products from polymetallic ores to avoid the predicted exhaustion of key metals in demand in technological societies. Many technologies, proven or still to be developed, will assist in meeting the demands of the next generation for trace and rare metals, potentially including the broader application of biohydrometallurgy for the extraction of multiple metals from low-grade and complex ores. Developed biotechnologies that could be applied are briefly reviewed and some of the difficulties to be overcome highlighted. Examples of the bioleaching of polymetallic mineral resources using different combinations of those technologies are described for polymetallic sulfide concentrates, low-grade sulfide and oxidised ores. Three areas for further research are: (i) the development of sophisticated continuous vat bioreactors with additional controls; (ii) in situ and in stope bioleaching and the need to solve problems associated with microbial activity in that scenario; and (iii) the exploitation of sulfur-oxidising microorganisms that, under specific anaerobic leaching conditions, reduce and solubilise refractory iron(III) or manganese(IV) compounds containing multiple elements. Finally, with the successful applications of stirred tank bioleaching to a polymetallic tailings dump and heap bioleaching to a polymetallic black schist ore, there is no reason why those proven technologies should not be more widely applied.

show abstract

Arsenate sorption on schwertmannite

Cited by 91 publications

References 14 publications

Adsorption and Post Adsorption Behavior of Schwertmannite with Various Oxyanions

Adsorption and Post Adsorption Behavior of Schwertmannite with Various Oxyanions

Magnetic Removal of Phosphate from Wastewater Using Schwertmannite

Review of Biohydrometallurgical Metals Extraction from Polymetallic Mineral Resources

Contact Info

Product

Resources

About