Journal ArticleDOI
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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Recent progresses, challenges, and opportunities of carbon-based materials applied in heavy metal polluted soil remediation.
Tianhong Fu,Baige Zhang,Xing Gao,Shihao Cui,Chung-Yu Guan,Yujin Zhang,Bangxi Zhang,Yutao Peng +7 more
TL;DR: In this article , a comprehensive review on applications of carbon-based materials (CBMs) in heavy metal polluted soil remediation was provided, which provided insights into advanced progresses on utilization of typical CBMs including biochar, activated carbon, graphene, graphene oxide, carbon nanotubes, and carbon black for heavy metal contaminated soil.
Journal ArticleDOI
Assessing biochar application to immobilize Cd and Pb in a contaminated soil: a field experiment under a cucumber-sweet potato-rape rotation
TL;DR: Results showed that the application of BC can significantly increase the pH, cation exchange capacity and soil organic matter, and the uptake of Cd and Pb in all three crops decreases with the increase in BC doses, which is mainly related to the decrease in bioavailable metals in their respective soil treatments.
Journal ArticleDOI
Biochar applied to soil under wastewater irrigation remained environmentally viable for the second season of potato cultivation.
Christopher Nzediegwu,Shiv O. Prasher,Eman Elsayed,Jaskaran Dhiman,Ali Mawof,Ramanbhai M. Patel +5 more
TL;DR: After the second season of being in the soil, biochar significantly reduced the concentrations of Cd, Cu, Cr, Pb and Zn in the edible flesh suggesting that biochar immobilized wastewater-laden heavy metals in soil and reduced their uptake in potatoes for at least two seasons.
Journal ArticleDOI
Effects of biochar on growth of Asian lotus (Nelumbo nucifera Gaertn.) and cadmium uptake in artificially cadmium-polluted water
TL;DR: In this paper, the effects of biochar on the growth of Nelumbo nucifera and cadmium (Cd) accumulation in plant tissues were evaluated in the artificially polluted water-soil.
Journal ArticleDOI
Biochar effectively remediates Cd contamination in acidic or coarse- and medium-textured soils: A global meta-analysis
TL;DR: In this article , the effect of biochar on soil Cd bioavailability has been evaluated using 802 paired observations from 84 peer-reviewed articles, and the authors concluded that biochar application to acidic or coarse-and medium-textured soils is effective for remediating Cd contamination.
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Journal ArticleDOI
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Journal ArticleDOI
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