Arsenic and chromium removal from water using biochars derived from rice husk, organic solid wastes and sewage sludge

Agrafioti, Evita; Kalderis, Dimitrios; Diamadopoulos, Evan

doi:10.1016/j.jenvman.2013.12.007

Cited by 378 publications

(114 citation statements)

References 31 publications

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“…The Langmuir model is not suitable to describe adsorption of phenols on biochars as also discussed in other relevant studies (Huang and Chen, 2010;Han et al, 2013;Agrafioti et al, 2014).…”

Section: Phenol Sorption Isotherm Modelsmentioning

confidence: 99%

“…Biochar can be produced in every country using various raw materials including energy crops (e.g., corn, cereals, wood pellets, and oilseed rape), agricultural wastes (e.g., wheat straw, rice husk, waste wood, pistachio, peanut, hazelnut shells, and manure) and other wastes including sewage sludge (Liu et al, 2012;Moussavi and Khosravi, 2012;Agrafioti et al, 2013Agrafioti et al, , 2014Inyang et al, 2014;Frišták et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Morphology of Modified Biochar and Its Potential for Phenol Removal from Aqueous Solutions

Komnitsas

Zaharaki

2016

Front. Environ. Sci.

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In the present study, the efficiency of phenol removal from synthetic aqueous solutions by chemically modified biochar with the use of 1M KOH or 1M FeCl 3 was investigated. Initially, biochar was produced after slow pyrolysis of three different agricultural wastes, namely pistachio (Pistacia vera L.) shells, pecan (Carya illinoinensis) shells, and wood sawdust. The quality of biochar was assessed by evaluating its main properties, such as pH, surface area, porosity and C content. X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR) were used for the identification of biochar's structure. The efficiency of phenol removal from synthetic solutions was assessed with the use of kinetic and equilibrium experiments. The experimental results show that the KOH-modified biochar exhibited the highest phenol removal efficiency. Hydrophobic sorption on its surface is the main phenol removal mechanism. The pseudo-second order model fits best the kinetic data, while the Freundlich model, as deduced from an equilibrium study describes very well sorption of phenols on all biochars examined.

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“…The Langmuir model is not suitable to describe adsorption of phenols on biochars as also discussed in other relevant studies (Huang and Chen, 2010;Han et al, 2013;Agrafioti et al, 2014).…”

Section: Phenol Sorption Isotherm Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology of Modified Biochar and Its Potential for Phenol Removal from Aqueous Solutions

Komnitsas

Zaharaki

2016

Front. Environ. Sci.

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“…Chen et al [57] studied adsorption isotherms at different initial of Cu (II) and Zn (II) that ranged from 0.1 to 5.0 mM that has proven that the Langmuir model (R 2 > 0.998) fit the data better than the Freundlich model (R 2 were 0.86-0.94). Many researchers also reported that adsorption of trace metals by biochar fits better to Freundlich than Langmuir isotherm in the dynamic data [26,131,132,133].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Review of Eco-Friendly Biochar Used in the Removal of Trace Metals on Aqueous Phases

Duwiejuah¹,

Cobbina²,

Bakobie³

2017

IJEBB

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Eco-friendly biochar produced from cost-effective and readily available agricultural waste will likely pose no threat on the aqueous phases, other environmental media, human health and emission of greenhouse gases to the atmosphere. Optimising biochar for an intended application could require careful selection of a biomass feedstock as well as production pyrolysis technique and conditions for the production of biochars with specific characteristics. Previous studies have explores the relationships that exist between biochar production conditions, characteristics, and possible end-uses of biochar. This review provides an overview of the production and utilisation of biochar as absorbents for adsorption of trace metals in contaminated aqueous environment. Biochar has great affinity to adsorb molecular ions that is making it possible to be used for various toxicological remediation strategies. It has proven effective and useful for mitigating aqueous metals, organic compounds, suspended solids, and organic hydrocarbons in a various kind of industrial applications such as urban and residential storm water runoff, landfill leachates, industrial runoff, resource extraction runoff, and industrial wastewater filtration. Specifically designed biochar could be very effective in the removal of trace metals from contaminated aqueous environment. The multiple factors that determine the adsorption of the trace metals in aqueous environment or phases needs to be carefully examined. Cost-effectiveness of biomass feedstock and eco-friendliness of techniques need to also be given much consideration by way of making comparison with existing contaminant mitigation technologies. Keywords: aqueous phases, biochar, cost-effective, biomass feedstock, removal, trace metalsCite This Article: A. B. Duwiejuah, S.

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“…For this reason, batch kinetic, as well as equilibrium sorption and desorption experiments were conducted using As (V), Cr (III) and Cr (VI) as adsorbates. The biochars used were derived from rice husk, the organic fraction of municipal solid wastes and sewage sludge [5]. Chromium forms three common oxidation states in its compounds, +2, +3, and +6.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Removal of Chromium by using Cow Dung as Low Cost Adsorbents

Thangavel¹,

Gopal²

2017

IJIES

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Abstract:In apparent, the intension is removal of chromium using cow dung as low cost adsorbents from the industrial wastewater. Chromium (Cr) is one of the most toxic substances and is introduced into the environment through a variety of industrial activities. In order to remove the chromium from the contaminated water there are lot of methods available, even though they are not in natural way. In the paper naturally availing material like Cow dung ash is used to remove the chromium by adsorbent method. Since the collected chromium contaminated waste water from the industry will have only a particular Cr+ concentration and pH value, an aqueous solution has been prepared with unique concentration and with different pH values. And activated ash is added separately to the aqueous solution with different dosages and varying contact periods. From the investigation and interpretation of results it has been noted that the Cow dung ash has effectively removed the chromium content when it was added 6g/l to the 1000ml of aqueous solution. In the view of contact time of the adsorbent, 3 hours of period been an ideal one and pH doesn't had a significant effect.

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Arsenic and chromium removal from water using biochars derived from rice husk, organic solid wastes and sewage sludge

Cited by 378 publications

References 31 publications

Morphology of Modified Biochar and Its Potential for Phenol Removal from Aqueous Solutions

Morphology of Modified Biochar and Its Potential for Phenol Removal from Aqueous Solutions

Review of Eco-Friendly Biochar Used in the Removal of Trace Metals on Aqueous Phases

Experimental Study on Removal of Chromium by using Cow Dung as Low Cost Adsorbents

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