Study on Adsorption of Cd in Solution and Soil by Modified Biochar-Calcium Alginate Hydrogel

Contamination with cadmium (Cd) is a prominent issue in agricultural non-point source pollution in China. With the deposition and activation of numerous Cd metal elements in farmland, the problem of excessive pollution of agricultural produce can no longer be disregarded. Considering the issue of Cd...

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Bibliographic Details
Published in:Gels 2024-06, Vol.10 (6), p.388
Main Authors: Wang, Shuyue, Wang, Yajun, Wang, Xinyi, Sun, Sijia, Zhang, Yanru, Jiao, Weixiong, Lin, Dasong
Format: Article
Language:English
Subjects:
Acids
Adsorption
Agricultural land
Cadmium
Calcium alginate
Cd pollution
Cellulose
Composite materials
Ecosystems
Functional groups
Heavy metals
Hydrogels
Hydroxyapatite
in situ passivation
Lignin
modified biochar
Morphology
Nonpoint source pollution
Nutrients
Outdoor air quality
Passivity
Plant growth
Point source pollution
Pollutants
Pollution
Pollution sources
Soil contamination
Toxicity
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Summary:Contamination with cadmium (Cd) is a prominent issue in agricultural non-point source pollution in China. With the deposition and activation of numerous Cd metal elements in farmland, the problem of excessive pollution of agricultural produce can no longer be disregarded. Considering the issue of Cd pollution in farmland, this study proposes the utilization of cross-linked modified biochar (prepared from pine wood) and calcium alginate hydrogels to fabricate a composite material which is called MB-CA for short. The aim is to investigate the adsorption and passivation mechanism of soil Cd by this innovative composite. The MB-CA exhibits a higher heavy metal adsorption capacity compared to traditional biochar and hydrogel due to its increased oxygen-containing functional groups and heavy metal adsorption sites. In the Cd solution adsorption experiment, the highest Cd removal rate reached 85.48%. In addition, it was found that the material also has an excellent pH improvement effect. Through the adsorption kinetics experiment and the soil culture experiments, it was determined that MB-CA adheres to the quasi-second-order kinetic model and is capable of adsorbing 35.94% of Cd in soil. This study validates the efficacy of MB-CA in the adsorption and passivation of Cd in soil, offering a novel approach for managing Cd-contaminated cultivated land.
ISSN:2310-2861
2310-2861
DOI:10.3390/gels10060388