Biochars derived from various crop straws: Characterization and Cd(II) removal potential

Sun, Jingkuan; Lian, Fei; Liu, Zhongqi; Zhu, Lingyan; Song, Zhengguo

doi:10.1016/j.ecoenv.2014.04.042

Cited by 213 publications

(72 citation statements)

References 29 publications

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“…This include metal exchange with K + and Na + due to the electrostatic outer-sphere complexation, inner-sphere complexation with free hydroxyl groups and surface complexation both carboxyl and hydroxyl functional groups being free. Similar mechanisms was observed in Hg (II) and Cd (II) adsorption onto biochar produced from soybean stalk [71] and corn straw [72], respectively. Also oxygen functional groups are noted to have stabilised trace metals in a biochar surface, mostly for softer acids like Cu 2+ and Pb 2+ [67,70].…”

Section: Mechanism Of Interaction Between Biochar and Trace Metalssupporting

confidence: 49%

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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Section: Mechanism Of Interaction Between Biochar and Trace Metalssupporting

confidence: 49%

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

Duwiejuah¹,

Cobbina²,

Bakobie³

2017

IJEBB

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“…This is prominent even in rice straw biochar at 2300 cm -1 as explained by Yakout (2015). The presence of oxygen containing functional groups are important in sorption of heavy metals on the biochar surface by forming strong complexes (Sun et al, 2014;Ahmad et al, 2014 ) and make them less bioavailable.…”

Section: Changes In Structural Propertiesmentioning

confidence: 98%

Changes in structural and chemical properties of rice husk biochar co-pyrolysed with Eppawala rock phosphate under different temperatures

et al. 2018

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Although properties of rice husk biochar (RHB) can be changed by altering pyrolysis temperature, they still remain as a poor-qualitysoil amendment. We hypothesised that addition of phosphate rock powder during the pyrolysis process will enhance structural and chemical properties of RHB. This experiment was conducted to determine the effect of temperature on properties of RHB co-pyrolysed with Eppawala Rock Phosphate (ERP). Rice husk was slow-pyrolysed at 350 °C, 500 °C and 650 °C, with and without 4.2% ERP (w/w), and produced six different types of RHB. Scanning electron micrographs showed an improved pore structure in RHB with increasing pyrolysis temperature, however co-pyrolysis with ERP did not show any further improvements. Raman spectroscopy provided evidence for increased aromatisation with the increase in temperature and formation of-PCH3 (sp 2 bond) in RHB co-pyrolysed with ERP at 350 °C. Iodine number in RHB increased by 140 mg/g when the temperature increased from 350 °C to 650 °C, however it has increased more in the presence of ERP at 350°C. The pH, EC, and available nutrients (P, K and Mg) in RHB increased with increasing temperature. Addition of ERP increased available P by 3-fold at all temperatures and K by 13% in RHB under 500 °C. We conclude that chemical properties of RHB can be improved by co-pyrolysing rice husk with ERP. When all characteristics were assessed together, biochar pyrolysed at 500 °C appears to be the most suitable soil amendment to improve soil fertility among conditions tested.

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“…Biochars derived from wood and bark had a small sorption capacity (0.34-5.40 mg Cd g − 1 ) (Mohan et al, 2007), and the maximum sorption of Cd 2+ by dairy manure biochar was greater (51.4 mg g −1 ) (Xu et al, 2013), and various crop straws derived biochars showed even greater sorption capacities for Cd 2+ (57.7-96.4 mg g −1 ) in aqueous solution. According to literature, sorption capacity of the biochars for Cd 2+ decreased in the order of crop straw N dairy manure N wood and bark (Ahmad et al, 2014;Frišták et al, 2015;Mohan et al, 2007;Sun et al, 2014;Xu et al, 2013). Obviously, selection of feedstocks for biochars is critical as the raw material often determines sorption capacity and performance of the resultant biochars.…”

Section: Introductionmentioning

confidence: 99%

Capacity and mechanisms of ammonium and cadmium sorption on different wetland-plant derived biochars

Cui

Hao²,

Zhang

et al. 2016

Science of The Total Environment

237

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Biochars derived from various crop straws: Characterization and Cd(II) removal potential

Cited by 213 publications

References 29 publications

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

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

Changes in structural and chemical properties of rice husk biochar co-pyrolysed with Eppawala rock phosphate under different temperatures

Capacity and mechanisms of ammonium and cadmium sorption on different wetland-plant derived biochars

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