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郑丽颖,温俊宝. 热解温度对秸秆生物炭钝化重金属污染土壤影响分析[J]. 科学技术与工程, 2020, 20(16): 6683-6687.
ZHENG Li-ying,WEN Jun-bao.Effect of Pyrolysis Temperature on Heavy Metal Contaminated Soil Passed by Straw Biochar[J].Science Technology and Engineering,2020,20(16):6683-6687.
热解温度对秸秆生物炭钝化重金属污染土壤影响分析
Effect of Pyrolysis Temperature on Heavy Metal Contaminated Soil Passed by Straw Biochar
投稿时间:2019-09-22  修订日期:2020-06-14
DOI:
中文关键词:  生物炭,重金属Pb,重金属Cd,热解温度,钝化
英文关键词:Biochar, heavy metal lead, heavy metal Cd, pyrolysis temperature, passivation
基金项目:国家重点研发计划项目(2018YFC1200400)
     
作者单位
郑丽颖 绥化学院,农业与水利工程学院,水利水电工程系
温俊宝 北京林业大学省部共建森林培育与保护教育部重点实验室
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中文摘要:
      为了探究热解温度对以黄豆秸秆制备生物炭对土壤重金属Pb及Cd的吸附及钝化性能,以黄豆秸秆为原材料,在300,500和700℃热解温度下制备生物炭,并探究其对土壤重金属铅锌的钝化作用。实验结果表明随热解温度升高,生物炭中碳含量呈现上升趋势,且pH由8.95升高至10.23,灰分的含量却由34.5%下降至28.6%。热解温度能对生物炭吸附重金属Pb及Cd产生影响,并且热解温度升高,重金属吸附量呈现上升趋势,并且当热解温度为700℃时,生物炭对Pb及Cd的吸附量分别为1.2和26.8 mg/g。进一步探究表明热解温度能够提高生物炭对Pb及Cd的钝化性能,机制研究表明生物炭能够提高土壤中pH,并且热解温度升高提高了残渣态Pb及Cd的含量而降低酸可提取态Pb及Cd的含量。
英文摘要:
      In order to investigate the adsorption and passivation of heavy metals Pb and Cd on Soil by biochar prepared from soybean straw under pyrolysis temperature, biochar was prepared from soybean straw at 300, 500 and 700 ℃, and its passivation effect on heavy metals Pb and Zn in soil was investigated. The experimental results showed that with the increase of pyrolysis temperature, the C content in biochar increased, and the pH increased from 8.95 to 10.23, while the ash content decreased from 34.5% to 28.6%. Pyrolysis temperature can affect the adsorption of heavy metals Pb and Cd by biochar. With the increase of pyrolysis temperature, the adsorption of heavy metals shows an upward trend. When pyrolysis temperature is 700 ℃, the adsorption of Pb and Cd by biochar was 1.2 and 26.8 mg/g, respectively. Further research showed that pyrolysis temperature improved the passivation of lead and cadmium by biochar. The mechanism study showed that biochar could improve the pH of soil, and the pyrolysis temperature increases the content of residual lead and cadmium, while decrease the content of acid extractable lead and cadmium.
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