Removal of Pb2+ and Cd2+ from aqueous solution using chars from pyrolysis and microwave-assisted hydrothermal carbonization of Prosopis africana shell

Elaigwu, Sunday E.; Rocher, Vincent; Kyriakou, Georgios; Greenway, Gillian M.

doi:10.1016/j.jiec.2013.12.036

Cited by 150 publications

(60 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the materials that were tested, retention was greater in biochars and composts than in plant residues. Biochar has received considerable interest as a low cost and sustainable biosorbent to remove metal contamination such as As, Cd, Pb, Zn from waste water or acid mine drainage water [10][11][12][13][14][15]. Metal adsorption efficiency varied, however, and is affected by factors, such as functional groups, surface area, and environmental conditions [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Dang

Marschner

Fitzpatrick

et al. 2018

Water

View full text Add to dashboard Cite

Biochar can retain large amounts of protons and metals in the drainage water from acid sulfate soils and mine sites. Metal sorption can, however, be influenced by many factors, such as pH and metal composition. This study investigated proton, Al, and Fe retention capacity of eucalyptus biochar (1% w/v) at different pH and metal concentrations. In the absence of metals, the biochar had a high proton binding capacity, (up to 0.035 mmol of H + ), whereas its capacity to retain hydroxide ions was limited. A batch experiment was carried out at pH 4 and pH 7 with 10 −6 , 10 −5 , 10 −4 , 10 −3 , and 10 −2 M of added Fe or Al. Added metals precipitated considerably prior to addition of the biochar except that Al remained highly soluble at pH 4. The biochar had a high retention capacity for Al and Fe; at high (>1 mM) concentrations, over 80% of soluble metals were retained. Metal competition for binding sites of both Al and Fe at different ratios was investigated, but increasing concentrations of one metal did not reduce retention of the other. The results confirmed that biochar has high metal binding capacity under both acidic and neutral conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Dang

Marschner

Fitzpatrick

et al. 2018

Water

View full text Add to dashboard Cite

show abstract

“…Hydrothermal carbonization is a process of decomposing an organic material in hot water under high pressure to produce solid carbon material (hydrochar) and water soluble organics. It is a green and efficient approach for treating organic materials because of its comparatively low emission, and generation of nontoxic waste [4]. Due to its simple operation, mild reaction conditions, and ability to exploit renewable biomass with minimal pre-treatment, it is of a particular environmental advantage when compared to other techniques of carbonization [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…It has also been established that irradiation with microwave produced effective internal heating by direct coupling of microwave energy with solvents, reagents and catalysts, which increased the reactions greatly [13]. The use of microwave heating in hydrothermal carbonization process, and in the preparation of hydrochar from biomasses, glucose and other materials, such as human waste, cellulose and starch, has been reported [4,[14][15][16][17][18][19]. Some of these processes usually proceed via the degradation of starch or cellulose to form glucose and then further carbonization of the formed glucose.…”

Section: Introductionmentioning

confidence: 99%

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Elaigwu

Greenway

2016

Int J Ind Chem

Self Cite

View full text Add to dashboard Cite

Hydrothermal carbonization has been used as a green and effective technique for the preparation of hydrochars from simple carbohydrates, such as glucose. The chemical and structural properties of hydrochars prepared from glucose have been studied. However, the energy properties of hydrochars prepared from microwaveassisted hydrothermal carbonization of glucose have not been studied. Thus, in this study, microwave-assisted hydrothermal carbonization of glucose, and the energy properties of the prepared hydrochars are reported. The preparation involved heating glucose in de-ionized water at 200°C for 5-60 min in a microwave oven. The prepared hydrochars were characterized using scanning electron microscope, nitrogen sorption measurement, Fourier transform infrared spectroscopy, elemental (CHN) analyzer, and nuclear magnetic resonance, and their energy properties studied. The result indicated that, in comparison with previous studies using the classical hydrothermal carbonization process, this approach reduced the processing time greatly from hours to 45 min, while the increase in higher heating value of the hydrochar when compared to that of the starting material was higher in this study than some value previously reported.

show abstract

“…The application of biomass-derived char as an adsorbent is beneficial not only to the removal of pollutants but also to the reduction of carbon emissions. In particular, use of the byproduct biochar (obtained from fast pyrolysis of biomass aimed at the production of bio-oil) would provide an additional economic advantage [27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Characterization Of the Charmentioning

confidence: 99%

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Lee¹,

Park²,

Lee³

et al. 2016

Carbon letters

View full text Add to dashboard Cite

As a replacement for activated carbon, biochar was synthesized and used for the adsorptive removal of formaldehyde and nitrogen oxide. Biochar was produced from the fast pyrolysis of the red marine macro alga, Pyropia tenera. The P. tenera char was then activated with steam, ammonia and KOH to alter its characteristics. The adsorption of formaldehyde, which is one of the main indoor air pollutants, onto the seaweed char was performed using 1-ppm formaldehyde and the char was activated using a range of methods. The char activated with both the KOH and ammonia treatments showed the highest adsorptive removal efficiency, followed by KOH-treated char, ammonia-treated char, steam-treated char, and non-activated char. The removal of 1000-ppm NO over untreated char, KOH-treated char, and activated carbon was also tested. While the untreated char exhibited little activity, the KOH-treated char removed 80% of the NO at 50°C, which was an even higher NO removal efficiency than that achieved by activated carbon.

show abstract

Removal of Pb2+ and Cd2+ from aqueous solution using chars from pyrolysis and microwave-assisted hydrothermal carbonization of Prosopis africana shell

Cited by 150 publications

References 41 publications

Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Assessment of the Binding of Protons, Al and Fe to Biochar at Different pH Values and Soluble Metal Concentrations

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Contact Info

Product

Resources

About