Effects of temperature and frozen-thawed on cadmium adsorption enhancement by adding biochar in degraded soil

doi:10.14088/j.cnki.issn0439-8114.2021.07.009

Abstract

Abstract: Cd and degraded soils from northwestern Sichuan province were selected to investigate the effects of temperature and frozen-thawed adsorption enhancement by adding biochar in degraded soil which is of great significance on the application of biochar in alpine regions. The adsorption enhancement by biochar adding in degraded soil was found to be less affected by temperature. However, the influence of frozen-thawed on adsorption enhancement by biochar adding in degraded soil could not be ignored, which was related to the degree of soil degradation and the initial concentration of Cd. At low Cd concentrations, the Cd adsorption enhancement of biochar on mildly and moderately degraded soils notably decreased after frozen-thawed while the Cd adsorption enhancement effect on severely degraded soils was slightly improved. The key factor affecting the Cd adsorption enhancement of biochar on degraded soil was the degree of soil degradation, the adsorption enhancement would be higher as soil degradation became more serious. In the current study, biochar was demonstated which can effectively strengthen the adsorption and sequestration of heavy metals in degraded soils in alpine regions, reducing the environmental risk in migration and plant uptake of heavy metals.

Key words: temperature, frozen-thawed, degraded soil, biochar, cadmium, adsorption

CLC Number:

XIA Kun, LI Yun-gui, GONG Meng-sha, WU Cai-xia. Effects of temperature and frozen-thawed on cadmium adsorption enhancement by adding biochar in degraded soil[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(7): 53-60.

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