Abstract
In order to explore the effects of biochar prepared at different pyrolysis temperatures and different solid-liquid ratios on the adsorption and degradation of thiacloprid and imidacloprid in biochar, three biochar were prepared by oxygen pyrolysis with sawdust and as raw materials at 300, 500 °C and 600 °C respectively. The effects of biochar on the adsorption degradation of thiacloprid and Imidacloprid in biochar were studied. The results showed that the addition of biochar could significantly increase the soil pH, available phosphorus and organic carbon content, and reduce the soil H / C. The addition of biochar significantly improved the adsorption of thiacloprid and imidacloprid, and the adsorption capacity increased with the increase of biochar pyrolysis temperature. Biochar with different pyrolysis temperatures had different effects on the degradation of thiacloprid and imidacloprid. The strong adsorption capacity of high temperature biochar system reduces the chemical degradation rate of thiacloprid and imidacloprid. Proper solid-liquid ratio can avoid the waste of adsorbent and achieve the optimal utilization rate. Therefore, the types and properties of biochar should be fully considered when using biochar to repair pesticide contaminated soil.
Highlights
Imidacloprid, known as mimimidine, is a new nitromethylene insecticide
It is found that the addition of biochar can improve the adsorption of imidacloprid, atrazine and isoproturon in soil system, due to the specific surface area and organic carbon of the mixed system of biochar and soil The actual value of organic carbon (OC) content is lower than the theoretical value, resulting in its actual adsorption capacity being lower than the theoretical adsorption capacity
Due to the strong adsorption of biochar on pesticides, the utilization of pesticides by microorganisms and plants is reduced, which inhibits the microbial degradation of pesticides, and the inhibition increases with the increase of biochar dosage
Summary
Imidacloprid, known as mimimidine, is a new nitromethylene insecticide. Its chemical name is 1-6-. Compost and biochar are common remediation agents for fixing or transforming pesticides [12], while biochar is considered as an environmental remediation agent for adsorbing and degrading pollutants to reduce the risk of soil pollution. It is obtained by pyrolysis of biomass under anoxic and low temperature (< 700 °C) [10]. After 144 h, the liquid in 4 mL flask was extracted completely, and 4mL acetonitrile solution was added each time After shaking well, it was placed in a 25 ± 1 °C shaker to avoid light oscillation, and the oscillation speed was 150 rꞏmin-1.
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