Removal of Hazardous Oxyanions from the Environment Using Metal-Oxide-Based Materials

Weidner, Ewelina; Ciesielczyk, Filip

doi:10.3390/ma12060927

Cited by 101 publications

(39 citation statements)

References 121 publications

(177 reference statements)

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“…It has been identified and classified by USEPA that activated alumina is one of the best available technologies for As removal in drinking water (Weidner and Ciesielczyk, 2019) due to its relatively high surface area. Moreover, activated alumina has a selectivity towards As(III) and As(V) (Clifford, 1999;Weidner and Ciesielczyk, 2019). One of the key advantages of this novel adsorbent is its mechanical and chemical stability in aqueous environments.…”

Section: Selective Arsenic Removal By Adsorptionmentioning

confidence: 99%

Selective removal of arsenic in water: A critical review

Weerasundara

Bundschuh

2021

Environmental Pollution

161

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Selective removal of arsenic (As) is the key challenge as this not only increases the efficiency of removal of the main As species (neutral As(III) and As(V) hydroxyl-anions) but also allows the reduction of waste significantly as it does not co-remove other solutes. It increase the capacity and lifetime of units, while lowering the cost of the process. A sustainable selective mitigation method should be considered in relation to the economic resources available, the ability of infrastructure to sustain water treatment and the options for reuse and/or safe disposal of treatment residuals. Several methods of selective As removal have been developed, such as precipitation, adsorption and modified iron and ligand exchange. There are two types of mechanisms involved with As removal: Coulombic or ion exchange; and Lewis acid-base interaction. Solution pH is one of the major controlling factors limiting removal efficiency since most of the above-mentioned methods depend on complexation through electrostatic effects. The different features of two different As species make the selective removal process more difficult, especially under natural conditions. Most of the selective As removal methods involve hydrated Fe(III) oxides through Lewis acid-base interaction. Microbiological methods have been studied recently for selective removal of As although there have been only a small number of studies; however, the method shows remarkable results and indicates positive prospects for the future. The biggest challenges in selective removal of As is the presence of phosphate in water which is chemically comparable with As(V).

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Section: Selective Arsenic Removal By Adsorptionmentioning

confidence: 99%

Selective removal of arsenic in water: A critical review

Weerasundara

Bundschuh

2021

Environmental Pollution

161

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“…Notable among these forms of environmental pollution is the type caused by the release of poisonous heavy metals. 1 The interaction of the released heavy metals ions in the environment and their toxic levels is a function of their various redox potentials and aqueous speciation. Metal ions constitute a major category of water contaminants and these toxic ions enter the environment from various industrial processes such as paint, mining, cement industries, and many more.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Vanadium(V) From Textile Industry Effluent Using Luffa cylindrica Activated Carbon

et al. 2021

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This study investigated the utilisation of Luffa cylindrica activated carbon as a low-cost adsorbent in the removal of vanadium(V) from textile industry effluent in a batch adsorption experiment. The adsorption rate was studied for contact time, pH, and adsorbent dosage. The effect of pH on vanadium(V) removal was studied with 0.2 g/100 ml adsorbent dose, 10 min contact time, and textile effluent solution. The maximum removal efficiency was 99.90 % at pH 4, 97.43 % at 60 min of contact time, and 97.83 % at an adsorbent dosage of 1.0 g. The characterisation results from FTIR and SEM indicated that the adsorbents’ potential was fully exploited. In this study, the experimental findings were fitted using Langmuir and Freundlich isotherm models. Freundlich model gave a better fit of the experimental data. The kinetic data by the pseudo-second order kinetic model gave a better fit than the pseudo-first order kinetic model.

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“…Ferric hydroxide-based adsorbents can be used very efficiently to remove hazardous oxo-anions from contaminated groundwater ( Weidner and Ciesielczyk, 2019 ). Such materials are often used as filler in fixed-bed adsorbent (FBA) columns for water purification facilities ( Deliyanni et al., 2003 , 2009 ; Daus et al., 2004 ; Badruzzaman et al., 2004 ; Saha et al., 2005 ; Sperlich et al., 2005 , 2008 ; Naeem et al., 2007 ; Banerjee et al., 2008 ; Streat et al., 2008 ; Guan et al., 2008 ; Kolbe et al., 2011 ; Hilbrandt et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Predicting breakthrough of vanadium in fixed-bed absorbent columns with complex groundwater chemistries: A multi-component granular ferric hydroxide−vanadate−arsenate−phosphate−silicic acid system

Dabizha

Bahr²,

Kersten

2020

Water Research X

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Granular ferric hydroxide (GFH) is often used for fixed bed adsorbent (FBA) columns in groundwater purification units around the world to remove arsenate contaminations. Groundwater can contain also other toxic (e.g., antimonite and vanadate) and non-toxic oxo-anions (phosphate and silicic acid) that are known to affect FBA lifetimes. Therefore, understanding the breakthrough of toxic compounds intended for removal by FBA is essential to their design, and is important to predict accurately breakthrough curves (BTCs) for FBAs in waterworks to plan future operating costs. Rapid small-scale column tests (RSCCT) and pilot-scale FBA were used to simulate vanadate BTCs for complex groundwater chemistries. The BTCs were simulated successfully using a homogeneous surface diffusion model (HSDM) combining equilibrium chemical adsorption and kinetic mass transfer. Adsorption parameters for various groundwater compositions were predicted using the CD-MUSIC surface complexation model, which was set up for the first time for akaganéite-based granular ferric hydroxide with a competitive multi-solute system. The results indicated that V(V) is less prone to competitive adsorption effects, and use of the homogeneous surface diffusion model to predict the BTCs requires then the kinetic mass transfer Biot number to be used as the only fitting parameter. On the other hand, a concentration overshoot could be observed for the two weaker absorbed oxo-anions arsenate and phosphate because of displacement by the vanadate. Results of pilot scale test column BTCs of vanadate for three waterworks with different groundwater compositions could be favorably extrapolated with a unique Freundlich constant k F of 3.2 derived on basis of the multi-solute CD-MUSIC model, and a unique Biot number of 37 fixed for all three different test sites.

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Removal of Hazardous Oxyanions from the Environment Using Metal-Oxide-Based Materials

Cited by 101 publications

References 121 publications

Selective removal of arsenic in water: A critical review

Selective removal of arsenic in water: A critical review

Adsorption of Vanadium(V) From Textile Industry Effluent Using Luffa cylindrica Activated Carbon

Predicting breakthrough of vanadium in fixed-bed absorbent columns with complex groundwater chemistries: A multi-component granular ferric hydroxide−vanadate−arsenate−phosphate−silicic acid system

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