[Modified Biochar for Remediation of Soil Contaminated with Arsenic and Cadmium: A Review].
Huan Jing Ke Xue
; 44(7): 4077-4090, 2023 Jul 08.
Article
em Zh
| MEDLINE
| ID: mdl-37438305
ABSTRACT
Binary pollution of arsenic (As) and cadmium (Cd) has become the main soil environmental problem in China. As an adsorbent or immobilizer, modified biochar is playing an increasing role in the remediation of As and Cd-contaminated soil. Here, the limitations regarding the primitive biochar as an immobilizer for the remediation of As and Cd-contaminated soil were highlighted by this study. Meanwhile, the biochar modification methods for the remediation of As and Cd-contaminated soil were reviewed, and the main interaction mechanisms were analyzed. Finally, the prospects and questions for the future remediation of soil contaminated with As and Cd using modified biochar were proposed. The results showed that metal-modified biochar had a better synergistic effect on the remediation of As and Cd-contaminated soil and thus had better application prospects. The immobilization mechanisms of As and Cd using biochar material remediation were affected by its modification methods. For example, the mechanisms for (non)metal-modified biochar involved the functional group-induced bonding complexation, co-precipitation, and oxyanion As redox; for microorganism-modified biochar, the mechanisms were precipitation and As redox, and those for physical- and acid-modified biochar only included the physical adsorption and weak electrostatic attraction. In view of the limitations of present research on the application of modified biochar for the remediation of As and Cd-contaminated soil, future research is suggested to study the followingâ the effect of biomass feedstock type, pyrolysis temperature, preparation conditions, cost, and soil aging; â¡ evaluation for stability and durability of heavy metal immobilization by modified biochar remediation under different environmental factors; and ⢠insight to key remediation mechanisms of As and Cd-contaminated soil by material.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arsênio
/
Cádmio
Idioma:
Zh
Revista:
Huan Jing Ke Xue
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
China