In situ co-adsorption of arsenic and iron/manganese ions on raw clays
Source abstract
Abstract
The use of clays as effective arsenic sorbents has been strongly limited due to their low pH ZPC and cation active behaviour in aqueous systems at pH > 3.5. A simple Fe/Al/Mn pre-treatment can significantly improve their sorption affinity to oxyanions, including arsenites and arsenates. The dynamics of arsenic adsorption from groundwater is also controlled by dissolved Fe/Mn ions, which behave as promoters of As adsorption, or competitors to adsorption sites. Low grade calcinated kaolin (MT) and bentonite (BT) were used as clay sorbents. Arsenic adsorption on raw clays without presence of Fe/Mn ions is very slow and limited. During co-adsorption the Fe/Mn ions and As oxyanions were adsorbed together onto a sorbent surface. Both Mn and Fe particles demonstrated a good sorption affinity to the clay surface, but only Fe particles supported As adsorption considerably (80% of As were removed in Fe/As system, while < 30% only in the Mn/As system). The kinetics of co-adsorption compared to the use of Fe/Mn pre-modified sorbents indicated a more dynamic process, while all mechanisms corresponded to the first order run (k ≈ 9.10 − 6– 1.10 − 4 s − 1). Arsenic was strongly stabilized in pre-modified sorbents.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Arsenic contamination and mitigation · Iron oxide chemistry and applications · Mine drainage and remediation techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (32)
Show source-provided references
1. Atlas of Eh-pH diagrams
2. Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface10.1016/j.jcis.2004.12.032 ↗
3. Groundwater As mobilization in the Bengal Delta Plain, the use of ferralite as a possible remedial measure — a case study10.1016/S0883-2927(03)00061-1 ↗
4. Sorption of arsenic by iron oxides and oxyhydroxides in soils10.1016/0883-2927(94)90038-8 ↗
5. Characterization of waste-Leaching-Compliance test for leaching of granular waste material and sludge
6. Electrochemical screening procedure for arsenic contaminated soils10.1016/j.talanta.2004.12.054 ↗
7. In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions10.1016/j.jcis.2008.03.042 ↗
8. Removal of As(V) species from extremely contaminated mining water10.1016/j.clay.2004.02.001 ↗
9. Sorption of AsV on aluminosilicates treated with FeII nanoparticles10.1016/j.jcis.2006.06.054 ↗
10. Modified aluminosilicates as low-cost sorbents of As(III) from anoxic groundwater10.1016/j.jhazmat.2008.09.088 ↗
11. Characterization of Fe-treated clays as effective As sorbents
12. Acid base reactions, phosphate and arsenate complexation, and their competitive adsorption at the surface of goethite in 0.7 M NaCl solution10.1016/S0016-7037(01)00589-0 ↗
13. Arsenic sorption onto natural hematite, magnetite and goethite10.1016/j.jhazmat.2006.07.020 ↗
14. Competitive adsorption of arsenate and arsenite on oxides and clay minerals10.2136/sssaj2002.0413 ↗
15. Voltametric analysis of iron oxide pigments10.1039/B205199K ↗
16. Fe(III) modified montmorillonite and bentonite: synthesis, chemical and UV–VIS spectral characterization, arsenic sorption, and catalysis of oxidative dehydrogenation of propane10.1346/CCMN.2007.0550206 ↗
17. Adsorption of As(III) from aqueous solution by iron oxide-coated sand10.1016/j.jcis.2005.02.054 ↗
18. Remediation of arsenic contaminated soils by iron-oxide application, evaluated in terms of plant productivity, arsenic and phytotoxic uptake10.1016/j.scitotenv.2007.09.021 ↗
19. Kolasinski · 2002 · 163
20. Sorption of arsenic by surfactant-modified zeolite and kaolinite10.1016/j.micromeso.2007.03.038 ↗
21. Adsorption, desorption and oxidation of arsenic affected by clay minerals and aging process10.1007/s002540050490 ↗
22. Potential indicators for the assessment of arsenic natural attenuation in the subsurface10.1016/S1093-0191(02)00056-4 ↗
23. Arsenic removal from water/wastewater using adsorbents — a critical review10.1016/j.jhazmat.2007.01.006 ↗
24. Mechanism of arsenic release to groundwater, Bangladesh and West Bengal10.1016/S0883-2927(99)00086-4 ↗
25. Fe, Al and Si species and organic matter leached off a ferrallitic and podzolic soil system from Central Amazonia10.1016/j.geoderma.2006.10.002 ↗
26. Adsorption of inorganic and organic arsenic from aqueous solutions by polymeric Al/Fe modified montmorillonite10.1016/j.seppur.2007.01.025 ↗
27. Surface complexation of arsenic(V) to iron(III) (hydr)oxides: structural mechanism from ab initio molecular geometries and EXAFS spectroscopy10.1016/S0016-7037(03)00237-0 ↗
28. Arsenic enrichment in groundwater of West Bengal, India: geochemical mobilization of As under reducing conditions10.1016/S0883-2927(03)00060-X ↗
29. Adsorption and removal of arsenic(V) from drinking water by aluminum-loaded Shirasu zeolite10.1016/S0304-3894(02)00020-1 ↗
30. In situ chemical fixation of arsenic contaminated soils: an experimental study10.1016/j.scitotenv.2007.06.024 ↗
31. Preparation and evaluation of a novel Fe–Mn binary oxide adsorbent for effective arsenite removal10.1016/j.watres.2007.02.009 ↗
32. Redox control of arsenic mobilization in Bangladesh groundwater10.1016/j.apgeochem.2003.09.007 ↗