Arsenic transformation behaviour during thermal decomposition of P. vittata, an arsenic hyperaccumulator

Duan, Lunbo; Li, Xiaole; Jiang, Ying; Lei, Mei; Dong, Ziping

doi:10.1016/j.jaap.2017.01.013

Cited by 38 publications

(6 citation statements)

References 39 publications

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“…Lead sorption by biochar produced from digestates: Table S2 shows the metal(loid) contents of RMSW, MSW sem , RSS and SS sem . Metals such as Cr, Cu, Pb and Zn were retained in the biochars during pyrolysis, while As (metalloid) was volatilized at the temperature below 400 °C (Table S2), this was also affirmed by previous studies from Duan et al (2017). As expected, Cu and Zn were the main components in both the solid digestates and biochars (Table S2), which was in correlation to the studies from .…”

Section: Supplementary Informationsupporting

confidence: 85%

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Wongrod

Simon

Guibaud

et al. 2018

Journal of Environmental Management

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The main objectives of this work are to investigate the consequences of different chemical treatments (i.e. potassium hydroxide (KOH) and hydrogen peroxide (HO)) and the effect of biochar washing on the Pb sorption capacity. Biochars derived from sewage sludge digestate and the organic fraction of municipal solid waste digestate were separately modified with 2 M KOH or 10% HO followed by semi-continuous or continuous washing with ultrapure water using batch or a column reactor, respectively. The results showed that the Pb adsorption capacity could be enhanced by chemical treatment of sludge-based biochar. Indeed, for municipal solid waste biochar, the Pb maximum sorption capacity was improved from 73 mg g for unmodified biochar to 90 mg g and 106 mg g after HO and KOH treatment, respectively. In the case of sewage sludge biochar, it increased from 6.5 mg g (unmodified biochar) to 25 mg g for HO treatment. The sorption capacity was not determined after KOH treatment, since the Langmuir model did not fit the experimental data. The study also highlights that insufficient washing after KOH treatment can strongly hinder Pb sorption due to the release of organic matter from the modified biochar. This organic matter may interact in solution with Pb, resulting in an inhibition of its sorption onto the biochar surface. Continuous column-washing of modified biochars was able to correct this issue, highlighting the importance of implementing a proper treated biochar washing procedure.

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Section: Supplementary Informationsupporting

confidence: 85%

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Wongrod

Simon

Guibaud

et al. 2018

Journal of Environmental Management

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“…Comparing to other pyrolysis parameters, few reports are available to understand the influence of reaction atmosphere and gas flow rate on pyrolysis process of HMEB. Biomass pyrolysis is typically carried out under an inert atmosphere where Ar, 110,111 N 2 66,112 or He 52,101 are used as purging gases. In a recently developed pyrolysis process, the steam was used as the carrier gas to potentially take part in the reactions 113,114 .…”

Section: Influence Of Pyrolysis System Configuration and Operating Pa...mentioning

confidence: 99%

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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“…In the case of HAsBS, however, roasting generates toxic gases containing sulfur oxide gases (SO x ) and arsenic oxides (As 2 O 3 or As 2 O 5 ) making it an unsuitable technique to treat HAsBS [24,25]. These toxic emissions can lead to leaks of arsenic and potential incidents of exposure, highlighting the unsuitability of roasting for HAsBS ores [26,27].…”

Section: Introductionmentioning

confidence: 99%

A Pretreatment of Refractory Gold Ores Containing Sulfide Minerals to Improve Gold Leaching by Ammonium Thiosulfate: A Model Experiment Using Gold Powder and Arsenic-Bearing Sulfide Minerals

Mhandu

Jeon

Hamatsu

et al. 2023

Metals

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The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold extraction from sulfide bearing gold ores is proposed based on the model experiments using a mixture of gold powder and arsenopyrite-bearing sulfide (HAsBS) ore. The effects of HAsBS ore on gold leaching in ammonium thiosulfate solutions were investigated, and it was found that gold extraction in the presence of HAsBS ore was suppressed because of the unwanted decomposition of thiosulfate on the surface of sulfide minerals. To improve gold extraction in the presence of the sulfide minerals, this study investigated the effects of the pretreatment of HAsBS ore using ammonium solutions containing cupric ions and confirmed that HAsBS ore was oxidized in the pretreatment and its surface was covered by the oxidation products. As a result, thiosulfate consumption was minimized in the subsequent gold leaching step using ammonium thiosulfate, resulting in an improvement in gold extraction from 10% to 79%.

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Arsenic transformation behaviour during thermal decomposition of P. vittata, an arsenic hyperaccumulator

Cited by 38 publications

References 39 publications

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

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

A Pretreatment of Refractory Gold Ores Containing Sulfide Minerals to Improve Gold Leaching by Ammonium Thiosulfate: A Model Experiment Using Gold Powder and Arsenic-Bearing Sulfide Minerals

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