Arsenic binding mechanisms on natural red earth: A potential substrate for pollution control

Vithanage, Meththika; Senevirathna, Wasana; Chandrajith, Rohana; Weerasooriya, Rohan

doi:10.1016/j.scitotenv.2006.03.045

Cited by 30 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Arsenic retention on natural red earth (NRE) was examined as a function of pH, ionic strength, and initial arsenic loading using both macroscopic and spectroscopic methods [161,162]. This NRE is considered as an iron coated sand.…”

Section: Sandmentioning

confidence: 99%

Arsenic removal from water/wastewater using adsorbents—A critical review

Mohan

Pittman

2007

Journal of Hazardous Materials

3,015

1,445

View full text Add to dashboard Cite

Section: Sandmentioning

confidence: 99%

Arsenic removal from water/wastewater using adsorbents—A critical review

Mohan

Pittman

2007

Journal of Hazardous Materials

3,015

1,445

View full text Add to dashboard Cite

“…The key immobilizing chemistries involve (ad)sorption, precipitation, complexation, and redox reactions (Adriano et al 2004;Porter et al 2004). Until now, various amendments including phosphate compounds (Ma et al 1995;Bolan et al 2003), liming materials (Ok et al 2007(Ok et al , 2011Lim et al 2013), organic materials (Park et al 2011;Brown et al 2003), and metal oxides (Vithanage et al 2007;Almaroai et al 2014) have been examined to immobilize heavy metals in contaminated soils. However, few studies have simultaneously compared the effectiveness of several candidate amendments with different properties for metal immobilization under consistent examining conditions.…”

Section: Introductionmentioning

confidence: 99%

The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil

Rajapaksha

Ahmad

Vithanage

et al. 2015

Environ Geochem Health

Self Cite

100

View full text Add to dashboard Cite

High concentration of toxic metals in military shooting range soils poses a significant environmental concern due to the potential release of metals, such as Pb, Cu, and Sb, and hence requires remediation. The current study examined the effectiveness of buffalo weed (Ambrosia trifida L.) biomass and its derived biochars at pyrolytic temperatures of 300 and 700 °C, natural iron oxides (NRE), gibbsite, and silver nanoparticles on metal immobilization together with soil quality after 1-year soil incubation. Destructive (e.g., chemical extractions) and non-destructive (e.g., molecular spectroscopy) methods were used to investigate the immobilization efficacy of each amendment on Pb, Cu, and Sb, and to explore the possible immobilization mechanisms. The highest immobilization efficacy was observed with biochar produced at 300 °C, showing the maximum decreases of bioavailability by 94 and 70% for Pb and Cu, respectively, which were attributed to the abundance of functional groups in the biochar. Biochar significantly increased the soil pH, cation exchange capacity, and P contents. Indeed, the scanning electron microscopic elemental dot mapping and X-ray absorption fine structure spectroscopic (EXAFS) studies revealed associations of Pb with P (i.e., the formation of stable chloropyromorphite [Pb5(PO4)3Cl]) in the biomass- or biochar-amended soils. However, no amendment was effective on Sb immobilization.

show abstract

“…Arsenic extraction from mine waters is commonly achieved by oxidation of As(III) to As(V) and co-precipitation of ferric arsenate with iron hydroxide (FeAsO 4 × Fe(OH) 3 ) in a high-density sludge process in active treatment systems (Lawrence & Higgs 1999;Leist et al 2000). Many workers have documented the removal of As from mine water by adsorption onto various iron compounds including ferric hydroxide (Dousova et al 2005;Ku¨chler et al 2005), zerovalent iron (Wildeman et al 2006), ferrihydrite (Jia & Demopoulos 2005), goethite (Fendorf et al 1997), red mud produced during the extraction of aluminium from bauxite (Altundogan et al 2000(Altundogan et al , 2002, and natural red earth (Vithanage et al 2007). Treatment of As-contaminated mine water through adsorption and coprecipitation in a water treatment plant is reliable and appropriate at active mine sites where power is available and personnel are on site to operate the plant.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of arsenic by iron rich precipitates from two coal mine drainage sites on the West Coast of New Zealand

Rait¹,

Trumm²,

Pope³

et al. 2010

New Zealand Journal of Geology and Geophysics

View full text Add to dashboard Cite

Dissolved As can be strongly adsorbed to fine grained Fe(III) minerals such as hydroxides, oxyhydroxides and hydroxysulphates. Therefore precipitates that form during neutralisation or treatment of acid mine drainage have potential to be useful for treatment of As-contaminated water because acid mine drainage is often Fe rich. We tested the adsorption properties of Fe(III) rich precipitates from two West Coast coal mines with As-contaminated water from an historic gold ore processing site near Reefton. Precipitates were collected from distinctly different settings, an active acid mine drainage treatment plant at Stockton mine and the neutralisation/oxidation zone of acid mine drainage discharge at the abandoned Blackball Coal Mine. The two mine sites produce precipitates with different compositions and mineralogy. Arsenic adsorption onto precipitates from each site was determined in batch and column tests under laboratory conditions. Batch experiments indicate As adsorption occurs rapidly during the first 5 h and reaches equilibrium after 24 h. At equilibrium, and for a dosing ratio of 50 g of precipitate per litre of water, As concentrations decreased from 99 mg/L to 0.0080 mg/L with precipitates from Stockton and to 0.0017 mg/L with precipitates from Blackball. Arsenic adsorption capacity is up to 12 mg/g on precipitates from Stockton sludge and 74 mg/g on precipitates from Blackball. The Blackball precipitate adsorbs more As than precipitates from Stockton which is probably due to the higher Fe oxide content but pH and surface structure could also play a role. The column experiment confirmed that adsorption of As from a continuous waste stream onto these precipitates is possible, and that passive remediation using this waste product mixed with gravel to enhance permeability could be a viable approach at As-contaminated mine sites.

show abstract

Arsenic binding mechanisms on natural red earth: A potential substrate for pollution control

Cited by 30 publications

References 14 publications

Arsenic removal from water/wastewater using adsorbents—A critical review

Arsenic removal from water/wastewater using adsorbents—A critical review

The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil

Adsorption of arsenic by iron rich precipitates from two coal mine drainage sites on the West Coast of New Zealand

Contact Info

Product

Resources

About