Journal ArticleDOI
Methyl arsenic adsorption and desorption behavior on iron oxides.
Brandon J. Lafferty,Loeppert Rh +1 more
TLDR
Increased methyl substitution resulted in both decreased adsorbed arsenic at low arsenic concentrations in solution and increased ease of arsenic release from the iron oxide surface.Abstract:
In virtually all Earth surface environments, methylated forms of arsenic can be found. Because of the widespread distribution and toxicity of methyl-arsenic compounds, their adsorption by soil minerals is of considerable interest. The objective of this study was to compare the adsorption and desorption behavior of methylarsonic acid (MMAsV), methylarsonous acid (MMAsIII), dimethylarsinic acid (DMAsV), dimethylarsinous acid (DMAsIII), arsenate (iAsV), and arsenite (iAsIII) on iron oxide minerals (goethite and 2-line ferrihydrite) by means of adsorption isotherms, adsorption envelopes, and desorption envelopes (using sulfate and phosphate as desorbing ligands). MMAsIII and DMAsIII were not appreciably retained by goethite or ferrihydrite within the pH range of 3 to 11, while iAsIII was strongly adsorbed to both iron oxides. MMAsV and iAsV were adsorbed in higher amounts than DMAsV on goethite and ferrihydrite at all pH values studied. MMAsV and iAsV exhibited high adsorption affinities on both goethite and ...read more
Citations
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Journal ArticleDOI
Arsenic removal from water/wastewater using adsorbents—A critical review
Dinesh Mohan,Charles U. Pittman +1 more
TL;DR: Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates, and some commercial adsorbents which include resins, gels, silica, treated silica tested for arsenic removal come out to be superior.
Journal ArticleDOI
Application of layered double hydroxides for removal of oxyanions: A review
TL;DR: This review critically identifies the shortcomings in current research on LDHs, such as the common weaknesses in the adopted methodology, discrepancies among reported results and ambiguous conclusions.
Journal ArticleDOI
Kinetics of adsorption of metal ions on inorganic materials: A review
TL;DR: An attempt has been made to discuss the kinetics of adsorption of metal ions on inorganic solids on the basis of published reports, and the values of the kinetic rate coefficients indicate the speed at which the metal ions adsorb on the materials.
Journal ArticleDOI
Arsenate adsorption on an Fe-Ce bimetal oxide adsorbent: Role of surface properties
TL;DR: An Fe-Ce bimetal adsorbent was investigated with X-ray powder diffraction, transmission electron micrograph, Fourier transform infrared spectra, andXPS methods for a better understanding of the effect of surface properties on arsenate (As(V), proving that the adsorption of As(V) by Fe- CeO8 is mainly realized through the mechanism of quantitative ligand exchange.
Journal ArticleDOI
Sewage sludge biochar influence upon rice (Oryza sativa L) yield, metal bioaccumulation and greenhouse gas emissions from acidic paddy soil
TL;DR: SSBC can be beneficial in rice paddy soil but the actual associated benefits will depend on site-specific conditions and source of SS; long-term effects remain a further unknown.
References
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Journal ArticleDOI
A review of the source, behaviour and distribution of arsenic in natural waters
TL;DR: The scale of the problem in terms of population exposed to high As concentrations is greatest in the Bengal Basin with more than 40 million people drinking water containing ‘excessive’ As as mentioned in this paper.
Book
Chemical equilibria in soils
TL;DR: In this paper, Chemical equilibria in soils, chemical equilibrium in soil, Chemical equilibrium in soils, مرکز فناوری اطلاعات و اشعر رسانی, ک-شاouرزی
Book
Iron Oxides in the Laboratory: Preparation and Characterization
Udo Schwertmann,R. M. Cornell +1 more
TL;DR: In this paper, the main aim of the second edition is to present reliable, well-tested, up-to-date methods of synthesizing pure iron oxides, including monodispersed particles, presently of great interest to industry.
Journal ArticleDOI
Comparison of arsenic(V) and arsenic(III) sorption onto iron oxide minerals: implications for arsenic mobility.
Suvasis Dixit,Janet G. Hering +1 more
TL;DR: The sorption data indicate that, under most of the chemical conditions investigated in this study, reduction of As(V) in the presence of HFO or goethite would have only minor effects on or even decrease its mobility in the environment at near-neutral pH conditions.
Journal ArticleDOI
Arsenite and Arsenate Adsorption on Ferrihydrite: Kinetics, Equilibrium, and Adsorption Envelopes
TL;DR: In this paper, the authors compared the adsorption behavior of arsenite and arsenate on ferrihydrite, under carefully controlled conditions, with regard to adaption kinetics and the influence of pH.