Efficient Cr(VI) removal by pyrite/porous biochar: Critical role of potassium salt and sulphur.
Environ Pollut
; 346: 123641, 2024 Apr 01.
Article
em En
| MEDLINE
| ID: mdl-38428791
ABSTRACT
The excessive accumulation of hexavalent chromium (Cr(VI)) in the environment poses a risk to environment and human health. In the present study, a potassium bicarbonate-modified pyrite/porous biochar composite (PKBC) was prepared in a one-step process and applied for the efficient removal of Cr(VI) in wastewater. The results showed that PKBC can significantly remove Cr(VI) within 4 h over a wide range of pH (2-11). Meanwhile, the PKBC demonstrated remarkable resistance towards interference from complex ions. The addition of potassium bicarbonate increased the pore structure of the material and promoted the release of Fe2+. The reduction of Cr(VI) in aqueous solution was primarily attributed to the Fe(II)/Fe(III) redox cycle. The sulphur species achieved Fe(II)/Fe(III) cycle through electron transfer with iron, thus ensuring the continuous reduction capacity of PKBC. Besides, the removal rate was also maintained at more than 85% in the actual water samples treatment process. This work provides a new way to remove hexavalent chromium from wastewater and demonstrates the potential critical role of potassium bicarbonate and sulphur.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Sulfetos
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Poluentes Químicos da Água
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Bicarbonatos
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Compostos de Potássio
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Águas Residuárias
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article