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Short-term effects of biochar on soil heavy metal mobility are controlled by intra-particle diffusion and soil pH increase
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In this paper, the effects of biochar on the mobility of metals in soils are investigated, focusing on a possible kinetic limitation by transport in biochar particles, the evolution of the biochar mineral phases, and the effect of bio char on soil pH.Abstract:
Summary
Biochar, the solid product of biomass pyrolysis, can be used as a soil amendment to stabilize metals in contaminated soils. The effects of biochar on the mobility of metals in soils are, however, poorly understood. To identify the predominant processes, we focused on (i) a possible kinetic limitation by transport in biochar particles, (ii) the evolution of biochar mineral phases and (iii) the effect of biochar on soil pH. Batch experiments were conducted to measure the sorption kinetics of copper (Cu), cadmium (Cd) and nickel (Ni) and the sorption-desorption isotherms for lead (Pb), Cu, Cd, zinc (Zn) and Ni in a wood-derived biochar. Sorption data were then compared with extraction test results using biochar with one acidic and one basic soil contaminated by Zn, Cd and Pb. Kinetic results showed that biochar particle sizes controlled metal sorption rate despite a similar specific surface area, which indicated a limitation by intra-particle diffusion. Isotherms showed a partially reversible sorption to biochar following the order Pb > Cu > Cd ≥ Zn > Ni, which we explained primarily by the (co)precipitation of metals or their adsorption on specific biochar mineral phases. Effective metal immobilization was observed with biochar in both contaminated soils but could not be predicted from the sorption isotherms. This immobilization appeared to be governed by the soil pH increase, which induced a greater retention of metals on soil particles. Short-term effects of biochar on contaminated soils may therefore be controlled by diffusion in biochar particles and by soil alkalinization processes.read more
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The Effect of Sugarcane Bagasse Biochar on Maize Growth Factors in Lead and Cadmium-Polluted Soils
TL;DR: In this article , a pot experiment with a randomized complete block design was carried out to examine the impact of sugarcane bagasse biochar (SBB) on enhancing the development of maize in Cadmium (Cd) and Lead (Pb) polluted soil.
Journal ArticleDOI
Using Phosphorus-Rich Biochars to Remediate Lead-Contaminated Soil: Influence on Soil Enzymes and Extractable P
Pacian Netherway,Gabriel Gascó,Ana Méndez,Aravind Surapaneni,Suzie M. Reichman,Kalpit Shah,Jorge Paz-Ferreiro +6 more
TL;DR: In this paper, a Pb-contaminated soil was amended with two phosphate fertilizers (slow-and fast-release) and with biochar produced from poultry litter and from biosolids at three temperatures (300 °C, 400 °C and 500 °C).
Journal ArticleDOI
The Combination of Lime and Plant Species Effects on Trace Metals (Copper and Cadmium) in Soil Exchangeable Fractions and Runoff in the Red Soil Region of China
Lei Xu,Xiangyu Xing,Hongbiao Cui,Jing Zhou,Jun Zhou,Jianbiao Peng,Jingfeng Bai,Xuebo Zheng,Mingfei Ji +8 more
TL;DR: In this article, a two-year in situ experiment was carried out to explore an effective way to reduce the runoff erosion and water-soluble copper (Cu) and cadmium (Cd) in a contaminated soil (Cu: 1148 mgkg-1, Cd: 1.31 mg kg-1) near a large Cu smelter.
Journal ArticleDOI
Immobilization and assessment of heavy metals in chicken manure compost amended with rice straw-derived biochar
TL;DR: In this paper, a 30-day laboratory experiment was implemented to investigate the impact of additive biochar on the stabilization of heavy metals in chicken manure compost, and the results showed that the biochar was effective in stabilizing heavy metals.
Journal ArticleDOI
Granular activated charcoal from peanut (Arachis hypogea) shell as a new candidate for stabilization of arsenic in soil
Timothy Anemana,Mihály Óvári,Margit Varga,Judith Mihály,Nikolett Uzinger,Márk Rékási,Jun Yao,Enikő Tatár,Christina Streli,Gyula Záray,Victor G. Mihucz +10 more
TL;DR: A sandy soil of pH 5.0 artificially contaminated with 15.5mg/kg As in form of arsenate ions [iAs(V)] corresponding to the permissible value in force in Hungary was incubated for 4 weeks after amendment with different peanut shell-derived activated charcoal (AC) materials at an application rate of 2.5wt as mentioned in this paper.
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Journal ArticleDOI
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Journal ArticleDOI
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