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Adsorption-desorption behavior of carbendazim by sewage sludge-derived biochar and its possible mechanism

机译：污水污泥衍生生物炭及其机制的碳污染的吸附 - 解吸行为及其机制

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Biochar application in agricultural soil for environmental remediation has received increasing attention, however, few studies are focused on sewage sludge based biochar. The present study evaluated the effect of raw sewage sludge and sewage sludge based biochars produced at different pyrolysis temperatures (100-700 degrees C) on the adsorption-desorption of carbendazim in soil. Sewage sludge derived biochar significantly enhanced the sorption affinity and limited the desorption capacity of the soil for carbendazim. A maximum removal efficiency of 98.9% and a greatest value of 144.05 +/- 0.32 mu g g(-1) sorption capacity occurred in soil amended with biochar pyrolyzed at 700 degrees C (BC700). As the pyrolysis temperature and the amendment rate of biochars increased, the sorption of carbendazim was promoted and desorption was further inhibited. The adsorption-desorption hysteresis index of carbendazim was consistently higher in soils amended with biochars (>0.85) than in the unamended soil (0.42-0.68), implying that carbendazim could be immobilized in soil amended with sewage sludge derived biochars. The partition effect was dominant in the sorption process for carbendazim in the biochar-soil mixtures. This study will be helpful for the disposal of sewage sludge and its utilization, and it is the first report for the study the sorption-desorption process of carbendazim in soil amended with sewage sludge derived biochar. Furthermore, these findings may be also useful for understanding the distribution and transport of carbendazim in the environment and will be of great significance in remediation strategies for contaminated soil.
机译：农业土壤中的生物炭申请环境修复得到了越来越多的关注，然而，很少的研究专注于基于污水的生物炭。本研究评估了在不同热解温度（100-700℃）下产生的原始污水污泥和基于污泥的生物脉冲的影响对土壤中碳纳西姆的吸附 - 解吸。污水污泥衍生的生物炭显着提高了吸附亲和力，并限制了碳纳西姆土壤的解吸能力。在700℃（BC700）下热解的土壤中，最大去除效率为98.9％，最大值为144.05 +/-0.32μmg（-1）吸附能力。随着热解温度和Biochars的修正率增加，促进了碳纳嗪的吸附，并进一步抑制了解吸。在未来未来的土壤中修正的土壤（> 0.85），碳氮扎姆的吸附 - 解吸滞后指数始终如一的土壤（0.42-0.68），这意味着在用污水污泥衍生的Biochars修正的土壤中可以固定碳纳西姆。分区效果在生物炭土壤混合物中的碳纳西姆的吸附过程中显着。本研究将有助于处理污水污泥及其利用，是第一份研究污泥污泥衍生生物炭土壤碳纳西姆的吸附解吸过程的报告。此外，这些发现也可用于理解碳纳西姆在环境中的分布和运输，并且对污染土壤的修复策略具有重要意义。

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    《RSC Advances》 |2019年第60期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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