Cadmium binding mechanisms and adsorption capacity by novel phosphorus/magnesium-engineered biochars

Penido, Evanise Silva; Melo, Leônidas Carrijo Azevedo; Guilherme, Luiz Roberto Guimarães; Bianchi, Maria Lúcia

doi:10.1016/j.scitotenv.2019.03.437

Cited by 89 publications

(30 citation statements)

References 50 publications

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“…Excess phosphates in the study area may induce the precipitation of Cd 3 (PO4) 2 and Cd 2+ [42,43]. The competitive adsorption between P and As in soil can reduce the adsorption of As in soil with an increase in P concentrations [44].…”

Section: Resultsmentioning

confidence: 99%

Enrichments of Cadmium and Arsenic and Their Effects on the Karst Forest Area

Wang

Bai

Liu

et al. 2019

IJERPH

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An understanding of the enrichment mechanisms of cadmium (Cd) and arsenic (As) in the process of rock weathering and soil formation is essential to develop agriculture according to local conditions. However, the enrichments of soil Cd and As under natural background conditions in karst areas are still uncertain. The enrichment factor, geo-accumulation index, redundancy analysis, and other methods were used to analyze the enrichment degree and the influencing factors of Cd and As on 5 rock–soil profiles and 15 topsoil samples, which were collected from a karst forest area in Libo County, Guizhou Province. The results showed that the enrichment process was divided into three stages. In the first stage, Cd and As were enriched in carbonate rocks, and their mean concentrations were 1.65 and 3.9 times those of the corresponding abundance of the crust. In the second stage, the enrichment of the parent rock into the soil, the enrichment factors of Cd and As in the parent material horizon relative to the bedrock horizon were 9.2 and 2.82, respectively. The third stage refers to the enrichments of Cd and As in the topsoil, where Cd enrichment was more obvious than that of As. Soil organic matter (SOM) and phosphorus (P) are important factors that influenced the enrichments of Cd and As in the topsoil. The functional groups of SOM were complexed with Cd and As; P easily formed precipitates with Cd, and the tree litter was fed back to the topsoil, which may be the reason for the surface enrichment of Cd and As. This study will help the scientific community understand the enrichment mechanisms of soil Cd and As in karst areas.

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Section: Resultsmentioning

confidence: 99%

Enrichments of Cadmium and Arsenic and Their Effects on the Karst Forest Area

Wang

Bai

Liu

et al. 2019

IJERPH

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“…Using Zn K-edge EXAFS spectroscopy, Qian et al (2016) showed that precipitation and formation of new mineral phases are the main mechanisms of Zn 2+ retention in higher pyrolysis temperature. Furthermore, Penido et al (2019) found that complexation and precipitation were the predominant adsorption mechanisms when studying Cd 2+ retention by phosphorus/magnesiumengineered biochars. In our study, we could not rule out the effective retention mechanisms.…”

Section: Adsorption Of CD 2+ and Cu 2+mentioning

confidence: 99%

Biochar produced from Amazonian agro-industrial wastes: properties and adsorbent potential of Cd2+ and Cu2+

Dias

Souza

Costa

et al. 2019

Biochar

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In the Amazon region, several residues that have been misused can serve as feedstocks for biochar production with the aim of recovering soils contaminated by heavy metals. However, these biochars need to be firstly tested for their adsorption capacity as well as their physicochemical attributes prior to field application. Therefore, this study aimed to characterize and evaluate the adsorption capacities of Cd 2+ and Cu 2+ of biochars produced from acai (BA), Brazil nut (BN), and palm kernel cake (BK) residues. Biochars were produced by slow pyrolysis at four different temperatures (400, 500, 600, and 700 °C). The physicochemical properties of the biochars, such as cation exchange capacity, ash, recalcitrance index, and aromaticity were enhanced with increased pyrolysis temperature. The adsorption capacities of Cd 2+ and Cu 2+ showed high correlations with the physicochemical properties of biochar, indicating the importance of these characteristics in the adsorption process. Furthermore, the adsorption of Cd 2+ and Cu 2+ also increased with the increase in the pyrolysis temperature. In a competitive system, Cd 2+ exhibited higher adsorption capacity than Cu 2+ for all biochars. In general, BN showed the highest adsorption capacity, followed by BK and BA. Biochars produced from the Amazonian residues have the potential to improve soil quality when used as amendments in the recovery of soils contaminated with Cd and Cu, representing an environmentally sound technology for the reuse of these residues.

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“…Afterwards, the tubes were agitated horizontally in an end-to-end Heidolph Unimax type shaker, at a speed of 200 rpm/ min, with continuous shaking of 24 hours to achieve equilibrium. Several works showed that the kinetics of heavy metal adsorption is a fast process (less than 24h) (PENIDO et al, 2019;HUANG et al, 2018;HOSLLET et al, 2019). Thus, in this work it was assumed that equilibrium in adsorption process is reached within 24 h. The laboratory temperature was 25 ˚C (± 2 ˚C).…”

Section: Adsorption and Desorption Of Znmentioning

confidence: 99%

“…P. 3037 -37.200-000 -Lavras -MGleonidas.melo@ufla.br and produced from the thermal decomposition of biomass at medium temperatures (usually 400 to 700 o C) with little or no oxygen supply (LIN et al, 2017). Moreover, biochar has potential to constitute an effective, sustainable and low cost waste management solution (MELO et al, 2015;PUGA et al, 2015;PENIDO et al, 2019). The initial focus on biochar research was due to its potential to mitigate climate change, resulting in carbon sequestration (WOOLF et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Coffee Waste Biochar: Characterization and Zinc Adsorption From Aqueous Solution

Sertoli

Carnier

Abreu

et al. 2019

C.Sci.

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The final disposal of organic wastes has become a major challenge with increasing industrialization and population growth. Coffee wastes are examples of this, thus the conversion of these biomasses into biochar through pyrolysis could provide economic and environmental benefits, such as remediation of heavy metal polluted water. Therefore, in this work, biochar produced at 700 °C from spent coffee grounds and coffee parchment were evaluated for Zn removal from aqueous solution. Batch adsorption tests were performed with six Zn concentrations and four replicates for each material. The desorption process was performed sequentially with a pH 4.9 buffer acetic acid solution. Langmuir and Freundlich isotherms were fitted to the adsorption data using non-linear models. Batch adsorption tests showed that the adsorption was strongly dependent on biochar properties. Biochar prepared from coffee parchment was more effective at Zn binding, showing the highest adsorption capacity (0.792 mg g<sup>-1</sup>). Nevertheless, both biochars bounded Zn strongly and the adsorption process was not easily reversed.

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Cadmium binding mechanisms and adsorption capacity by novel phosphorus/magnesium-engineered biochars

Cited by 89 publications

References 50 publications

Enrichments of Cadmium and Arsenic and Their Effects on the Karst Forest Area

Enrichments of Cadmium and Arsenic and Their Effects on the Karst Forest Area

Biochar produced from Amazonian agro-industrial wastes: properties and adsorbent potential of Cd2+ and Cu2+

Coffee Waste Biochar: Characterization and Zinc Adsorption From Aqueous Solution

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