期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.109007
关键词
Modified biochar; Silicate composite biochar; Cadmium contaminated soil; In-situ passivation
资金
- Wuhan Science and Technology Project of Hubei Province of China
- National Key Research and Development Program of China
- National Natural Science Foundation of China
- Fundamental Research Funds for the Central Universities
- [2020020601012264]
- [2018YFD0800703]
- [2016YFD0800702]
- [41571283]
- [2662018PY078]
Modified silicate composite biochar prepared through magnetization and granulation can effectively fix the heavy metal cadmium in soil, increase wheat yield, and reduce cadmium content.
Original biochar has the characteristic of fragile texture, which is easy to cause difficulties in application and environmental pollution during soil remediation. Moreover, it is difficult to be separated from the soil, the heavy metals passivated in-situ have the risk of being reactivated when the environment changes. Through the steps of magnetization and granulation, modified silicate composite biochar was prepared and the fixation mechanism of the materials on cadmium was also explored. The results showed that: (1) The dry weight of wheat in the blank was only 0.062 g, as well as the dry weights treated by biochars were more than 0.117 g. The content of cadmium in wheat cultured with KM6 was 0.22 mu g, only 39.64 % of the blank. (2) The biochar addition increased the soil's pH. The pH value of soil treated by silicate composite biochar reached 7.64-7.94, which promoted the trans-formation of cadmium ions to insoluble precipitation. (3) The content of available cadmium in untreated soil was 54.6 %, while which decreased to 22.9 %-29.9 % after adding silicate composite biochar. (4) Magnetic biochar contained the special iron-containing structures and iron oxides, which can react with cadmium to form stable complexes (such as (FeO)2Cd and (Fe-R-O)2Cd) to promote the removal of heavy metals.
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