Effect of pyrolysis temperature on chemical form, behavior and environmental risk of Zn, Pb and Cd in biochar produced from phytoremediation residue

Huang, Hui; Yao, Wenlin; Li, Ronghua; Ali, Amjad; Du, Juan; Guo, Di; Xiao, Ran; Guo, Zizhang; Zhang, Zengqiang; Awasthi, Mukesh Kumar

doi:10.1016/j.biortech.2017.10.020

Cited by 141 publications

(40 citation statements)

References 42 publications

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“…At 500 °C and 700 °C, the majority of exchangeable Cd in CRS was converted to non-exchangeable fraction, therefore the overall Cd concentration in CRSB500 and CRSB700 was significantly lower than CRS regardless the loss of the volatile matter. The findings are in line with Huang et al (2018) that increasing pyrolysis temperature from to 750 °C decreased the mobile (exchangeable) fraction of Cd and increased the stable fractions of Cd for a phytoremediation residue biochar. Bian et al (2018) pyrolyzed Cd contaminated wheat straws at 350 and 550 °C and observed that the acid soluble Cd in the biochars was very low to negligible.…”

Section: Risks Of CD Remained In the Biocharssupporting

confidence: 87%

“…Bian et al (2018) pyrolyzed Cd contaminated wheat straws at 350 and 550 °C and observed that the acid soluble Cd in the biochars was very low to negligible. However, both the present study and Huang et al (2018) found that the biochars produced at low temperatures (300 and 350 °C) contained significantly amount of exchangeable Cd and posed environmental risks.…”

Section: Risks Of CD Remained In the Biocharscontrasting

confidence: 51%

“…Although the effects of pyrolysis temperature on biochar properties have been extensively investigated (Kim et al, 2012;Zhang et al, 2017;Wei et al, 2019), few have looked at its influence on the chemical form, behavior and environmental risks of heavy metals in biochars. Huang et al (2018) produced biochars from phytoremediation residue at three different temperatures (350, 550, and 750 °C), and observed that ~ 40% of the Cd and Zn in the biochars produced at 350 °C was mobile and had significant environmental risks. Pyrolyzing at 550 °C or higher can greatly reduce the percentage of mobile Cd and Zn in the biochars and thereby reduce their risks.…”

Section: Introductionmentioning

confidence: 99%

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Risk evaluation of biochars produced from Cd-contaminated rice straw and optimization of its production for Cd removal

et al. 2019

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Enlighten-Research publications by members of the University of Glasgow http://eprints.gla.ac.uk  41% of Cd in raw rice straw was exchangeable, posing great environmental risks  Pyrolyzing at 300 °C did not significantly alter Cd fractions remained in biochar  Exchangeable fraction of Cd dropped to 5.79% at 500 °C and to 2.12% at 700 °C  Increasing temperature decreased exchangeable Cd fraction immobilized on biochar  CRSB700 has the fastest and highest Cd removal, and most stable Cd immobilization *Highlights (3 to 5 bullet points (maximum 85 characters including spaces per bullet point) 1 Risk evaluation of biochars produced from Cd-contaminated rice straw and optimization of its production for Cd removal

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Section: Risks Of CD Remained In the Biocharssupporting

confidence: 87%

Section: Risks Of CD Remained In the Biocharscontrasting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

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Risk evaluation of biochars produced from Cd-contaminated rice straw and optimization of its production for Cd removal

et al. 2019

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“…Pyrolysis temperature influences HMs distribution in pyrolysis products (char, oil and gas) [3]. HM is then mainly enriched in char product at low temperature pyrolysis, while there is only trace amount of HM in gas and oil products [8]. More than 98.5% of the HMs (Ni, Zn, Cu, Co, and Cr) were accumulated in char product obtained from contaminated corn stover at 600 C [9e11].…”

Section: Introductionmentioning

confidence: 99%

“…How to recover or reuse HMs in char is also a problem. High pyrolysis temperature could reduce HMs loaded char toxicity as it favored char aromatization and HMs stabilization [8]. While, the release of HMs to volatiles (gas and oil products) increased with temperature and heating rate, because higher temperature and faster heating rate increased their vapor pressure for enhancing diffusion rates [14].…”

Section: Introductionmentioning

confidence: 99%

Solar pyrolysis of heavy metal contaminated biomass for gas fuel production

Zeng

Minh

et al. 2019

Energy

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The study presented an innovative way to dispose and upgrade heavy metal (HM) contaminated biomass by solar pyrolysis. Pyrolysis of raw and HM (Cu and Ni) impregnated willow wood was performed in a solar reactor under different temperatures (600, 800, 1000, 1200, 1400 and 1600 C) and heating rates (10 and 50 C/s). The combined effects of HM and heating parameters (temperature and heating rates) on solar pyrolysis products were investigated. The results indicated that a threshold temperature of 1000 C was required in impregnated willow pyrolysis to make sure copper and nickel catalytic effects on promoting the cracking and reforming reactions of tar. It led to the gas yields from copper or nickel impregnated willow pyrolysis at 1200 C increased by 14.76% and 34.47%, respectively, compared with that from raw willow. In particular, the H 2 and CO production from nickel impregnated willow were higher than those from raw willow (10.30 and 12.16 mol/kg of wood versus 6.59 and 8.20 mol/kg of wood) in case of fast pyrolysis (50 C/s). Under heating rate of 10 C/s, H 2 and CO yields from only nickel impregnated willow increased compared with that from raw willow. Solar pyrolysis of HM contaminated biomass is a promising way to produce valuable syngas.

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A state‐of‐the‐art review of the fate of heavy metals and product properties from pyrolysis of heavy‐metal(loid)‐enriched biomass harvested from phytoextraction

Kumar

Kan

et al. 2022

Env Prog and Sustain Energy

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Vegetation has successfully been used for cleaning up metal(loid) polluted water bodies and lands through extracting and accumulating of contaminants in their aboveground biomass (phytoextraction). As this remediation technique is approaching extensive demonstration scale application and potential commercialisation, research efforts have been investigating new ways to achieve valorization of its by-products, the heavy-metal-enriched biomass (HMEB). Biomass pyrolysis as an energy conversion technique represents a key step to numerous valorization options of HMEB.During the pyrolysis of HMEB, understanding the thermal decomposition pathways, and the migration and transformation of metal(loid)s are critical for the production of clean, safe and value-added end-products. This work performs a state-of-the-art review of the studies conducted on phytoextraction and biomass pyrolysis of HMEB with emphasis on the properties of pyrolysis products as well as the behavior of heavy metal(loid)s during pyrolysis in relation to HMEB feedstock properties and the variables of the process.

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Effect of pyrolysis temperature on chemical form, behavior and environmental risk of Zn, Pb and Cd in biochar produced from phytoremediation residue

Cited by 141 publications

References 42 publications

Risk evaluation of biochars produced from Cd-contaminated rice straw and optimization of its production for Cd removal

Risk evaluation of biochars produced from Cd-contaminated rice straw and optimization of its production for Cd removal

Solar pyrolysis of heavy metal contaminated biomass for gas fuel production

A state‐of‐the‐art review of the fate of heavy metals and product properties from pyrolysis of heavy‐metal(loid)‐enriched biomass harvested from phytoextraction

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