An Assessment of U(VI) removal from groundwater using biochar produced from hydrothermal carbonization

Kumar, Sandeep; Loganathan, Vijay A.; Gupta, Ram B.; Barnett, Mark O.

doi:10.1016/j.jenvman.2011.05.013

Cited by 284 publications

(104 citation statements)

References 45 publications

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“…Adsorption data were fitted using a Langmuir isotherm model and sorption capacities were estimated (Kumar et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Koetlisi¹,

Muchaonyerwa²

2017

American Journal of Applied Sciences

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Pyrolysis of latrine fecal waste could produce valuable products for minimizing environmental contamination with heavy metals. The objective of this study was to determine yields, characteristics and cadmium (Cd) sorption of biochar from latrine fecal waste and sewage sludge, as affected by pyrolysis temperature. Slow pyrolysis at 350, 550 and 650°C, was used to produce the biochar. In addition to proximate and ultimate analysis, surface area, porosity and functional groups were analyzed. A batch sorption study was conducted to determine the cadmium sorption capacity of the biochar. Biochar from latrine waste had higher yield, ash content, surface area and pore volume and lower total and fixed carbon (C) and volatile matter than from sewage sludge. Yield, volatile matter, total C, nitrogen (N) and hydrogen (H) decreased with pyrolysis temperature, while ash content, surface area and porosity increased. Surface functional groups of the biochar also varied with feedstock and pyrolysis temperature. The Cd sorption capacities were higher for biochar from latrine waste than from sewage sludge. The findings indicated that characteristics of biochar from latrine waste differ from that of sewage sludge origin and has greater potential as an adsorbent for removal of Cd from wastewater.

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“…Adsorption data were fitted using a Langmuir isotherm model and sorption capacities were estimated (Kumar et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Koetlisi¹,

Muchaonyerwa²

2017

American Journal of Applied Sciences

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“…One of the properties of biochar is its ability to adsorb both inorganic substances (ions of heavy metals) [2][3][4][5] and organic contaminants in an aqueous environment as well as in soils, when it as a sorbent prevents or limits the access of undesirable substances to plants. It is the case of a number of mechanisms between the surface of biochar and the adsorbed substance; the mechanisms are electrostatic attraction, chemical bond, intercalation, hydrogen bonds, π-π interaction, pore fixation, hydrophobic interaction, etc.…”

Section: Adsorption Ability Of Biocharmentioning

confidence: 99%

Biochar – Ecological Product and Its Application in Environmental Protection

Gembalová¹,

Klouda²,

Rusín³

et al. 2017

dtetr

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Biochar is a product of the pyrolysis of waste from the process of biomass fermentation. It is the case of a porous carbonaceous material with a compact hydrophobic core of predominantly aromatic structure, sheathed with a shell exhibiting hydrophilic and chemically active properties (surface groups: -OH, C=O, -COOH). One of properties usable in environmental protection is its adsorption ability toward heavy metals and organic pollutants (pesticides, PAHs, pharmaceutical products, industrial wastes). The contribution contains the description of preparation, surface analysis (SEM), identification of functional groups (FTIR) and proposal for possible surface modifications (sonification, oxidation, reduction, hydrothermal pyrolysis with graphene oxide, etc.) with a view to increase the sorption ability of biochar.

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“…Their production by gasification, pyrolysis or hydrothermal carbonization (HTC) of plant or animal biomass (e.g. wood, manure, leaves or bone) in an oxygen deficient environment [2] generates large quantities of carbonaceous by-products known collectively as 'biochar' [3]. The composition and properties of biochar depend upon the production method and source material being combusted.…”

Section: Introductionmentioning

confidence: 99%

“…This results in variation in physical and chemical properties such as pH, ash content, surface area and chemistry [4]. Material produced from gasification and/or pyrolysis has a higher ash content than biochar produced via HTC which is richer in carbon [3]. Comparison of the characteristics of biochars produced from the same pinewood source material by HTC at 300 o C or pyrolysis at 700 o C for copper adsorption from aqueous solution [5] found that HTC-biochar had more active adsorption sites and stable carbon-oxygen complexes on its surface with a 95% increase in oxygen-containing groups compared to the source material.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic study of time-dependent fixation of UVI on biochar

Ashry

Bailey

Chenery

et al. 2016

Journal of Hazardous Materials

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Biochar, a by-product from the production of biofuel and syngas by gasification, was tested as a material for adsorption and fixation of U VI from aqueous solutions. A batch experiment was conducted to study the factors that influence the adsorption and timedependent fixation on biochar at 20 o C, including pH, initial concentration of U VI and contact time. Uranium (U VI ) adsorption was highly dependent on pH but adsorption on biochar was high over a wide range of pH values, from 4.5 to 9.0, and adsorption strength was time-dependent over several days. The experimental data for pH > 7 were most effectively modelled using a Freundlich adsorption isotherm coupled to a reversible first order kinetic equation to describe the time-dependent fixation of U VI within the biochar structure. Desorption experiments showed that U VI was only sparingly desorbable from the biochar with time and isotopic dilution with 233 U VI confirmed the low, or time-dependent, lability of adsorbed 238 U VI . Below pH 7 the adsorption isotherm trend suggested precipitation, rather than true adsorption, may occur. However, across all pH values (4.5-9) measured saturation indices suggested precipitation was possible: autunite below pH 6.5 and either swartzite, liebigite or bayleyite above pH 6.5.

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An Assessment of U(VI) removal from groundwater using biochar produced from hydrothermal carbonization

Cited by 284 publications

References 45 publications

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Biochar – Ecological Product and Its Application in Environmental Protection

Kinetic study of time-dependent fixation of UVI on biochar

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