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
Citations
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Journal ArticleDOI
Leaching Behavior of Pb and Cd and Transformation of Their Speciation in Co-Contaminated Soil Receiving Different Passivators
Sajid Mehmood,Sajid Mehmood,Muhammad Imtiaz,Saqib Bashir,Muhammad Rizwan,Sana Irshad,Gutha Yuvaraja,Muhammad Ikram,Omar Aziz,Allah Ditta,Allah Ditta,Sana Ur Rehman,Qaiser Shakeel,Muhammad Ali Mumtaz,Waqas Ahmed,Sammina Mahmood,Di Yun Chen,Shuxin Tu +17 more
TL;DR: In this paper, the authors proposed that excessive release of heavy metals in ecosystem poses a serious threat to human beings and food security, and the problem of removing heavy metals from contaminated soils is considered a complicated task for...
Journal ArticleDOI
Gasified Grass and Wood Biochars Facilitate Plant Establishment in Acid Mine Soils.
Claire L. Phillips,Kristin M. Trippe,Gerald Whittaker,Stephen M. Griffith,Mark Johnson,Gary M. Banowetz +5 more
TL;DR: Findings support the use of gasified biochar amendments to revegetate acid mine soils.
Journal ArticleDOI
Phytoextraction of Ni from a toxic industrial sludge amended with biochar
TL;DR: In this article, the feasibility of growing Ni-hyperaccumulating plants on a Technosol containing a toxic industrial sludge and to test the influence of a biochar amendment on plant growth and Ni uptake was evaluated.
Journal ArticleDOI
The effect of two different biochars on remediation of Cd-contaminated soil and Cd uptake by Lolium perenne.
TL;DR: Investigation of the effects of rice straw biochar and coconut shell biochar on Cd immobilization in contaminated soil and, subsequently, Cd uptake by Lolium perenne suggests that RSBC and CSBC have the potential to be used as a useful aided phytoremediation technology in Cd-contaminated soil.
Journal ArticleDOI
Bioavailability of heavy metals in contaminated soil as affected by different mass ratios of biochars.
Weijie Xu,Mohammad Shafi,Petri Penttinen,Shuzhen Hou,Wang Xin,Jiawei Ma,Bin Zhong,Jia Guo,Meizhen Xu,Zhengqian Ye,Liqing Fu,Qiying Huang,Dan Liu +12 more
TL;DR: It is concluded that peanut shell biochar with maize straw biochar at a mass ratio of 2:1 (DPS) and DSM have significantly decreased Pb, Zn and Cu concentration in plants.
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Journal ArticleDOI
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Journal ArticleDOI
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