Interactions of Aluminum with Biochars and Oxidized Biochars: Implications for the Biochar Aging Process

Qian, Linbo; Chen, Baoliang

doi:10.1021/jf404624h

Cited by 270 publications

(105 citation statements)

References 44 publications

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“…Once acid was applied to the biochar, solid phase carbonate in the biochar may have dissolved, increased pH (due to formation of HCO 3 − ), and induced metal precipitation within the solution and to the biochar. The eucalyptus biochar had 4% CaCO 3 ( Table 1), therefore some protons will also be neutralised by carbonates [44,45], although we adjusted to a set pH in the experiments. In summary, the results suggest that biochar has potential for metal and proton removal over a wide range of soluble metal concentrations, as they may occur in drainage channels of acidic ASS, which is in agreement with our previous studies [8,9].…”

Section: Discussionmentioning

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

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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.

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Section: Discussionmentioning

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

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“…The surface functionality can be characterized by X-ray photoemission spectroscopy (XPS), FTIR, and temperature programmed desorption (TPD) techniques [28][29][30]. The detailed surface chemistry of biochar, surface functionalities, and composition can be obtained from these technologies.…”

Section: Surface Functionality Characterizationmentioning

confidence: 99%

Characterization, Modification and Application of Biochar for Energy Storage and Catalysis: A Review

Xiu

Shahbazi²,

Li³

2017

Tr Ren Energy

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Biomass can be converted to biofuels and bioproducts via thermochemical processes. Biochar is one of the major products of thermochemical conversion of biomass. The efficient use of biochar is critical to improving the economic viability and environmental sustainability of biomass conversion technologies. Applications of biochar for both agricultural and environmental benefits (e.g. as soil amendment, for inorganic pollutant removal) have been studied and reviewed extensively. However, biochar for energy storage materials and catalytic applications has not been widely reviewed in the recent past. This review aims to present the more significant recent advances in several biochar utilizations such as catalysts and supercapacitors. Discussions on biochar production technologies, chemistry, properties, characteristics, and advanced functionalization techniques are provided. It also points out barriers to achieving improvements in the future.

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“…Although Al is typically in solution below pH 5.5, once in solution it is able to complex with organic and inorganic compounds. A recent study demonstrated that trivalent Al complexes with rice-straw derived biochars [17], and that the presence of silicon increased surface complexation. Because grasses typically contain more silicon than wood, our observation that KB-sourced biochar is more effective at lowering Al root concentrations than wood-sourced biochar may be attributable to fundamental biochar properties rather than a simple attenuation of pH.…”

Section: Discussionmentioning

confidence: 99%

Biochars Derived from Gasified Feedstocks Increase the Growth and Improve Nutrient Acquisition of Triticum aestivum (L.) Grown in Agricultural Alfisols

et al. 2015

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Abstract:Biochars are produced by low-oxygen gasification or pyrolysis of organic waste products, and can be co-produced with energy, achieving waste diversion and delivering a soil amendment that can improve agricultural yields. Although many studies have reported the agronomic benefits of biochars produced from pyrolysis, few have interrogated the ability of gasified biochars to improve crop productivity. An earlier study described the ability of a biochar that was derived from gasified Kentucky bluegrass (KB) seed screenings to impact the chemistry of acidic agricultural soils. However, that study did not measure the effects of the biochar amendment on plant growth or on nutrient acquisition. To quantify these effects we conducted a greenhouse study that evaluated wheat grown in agricultural soils amended with either the KB-based biochar or a biochar derived from a blend of woody mixed-waste. Our studies indicated that biochar amended soils promoted the growth of wheat in these agricultural alfisols. Our elemental analysis indicated that an attenuation of metal toxicity was likely responsible for the increased plant growth. The results of our study are placed in the context of our previous studies that characterized KBsourced biochar and its effects on soil chemistry.

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Interactions of Aluminum with Biochars and Oxidized Biochars: Implications for the Biochar Aging Process

Cited by 270 publications

References 44 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

Characterization, Modification and Application of Biochar for Energy Storage and Catalysis: A Review

Biochars Derived from Gasified Feedstocks Increase the Growth and Improve Nutrient Acquisition of Triticum aestivum (L.) Grown in Agricultural Alfisols

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