河南农业科学 ›› 2023, Vol. 52 ›› Issue (2): 84-93.DOI: 10.15933/j.cnki.1004-3268.2023.02.010

• 农业资源与环境 • 上一篇    下一篇

硫改性生物炭镉铅吸附机制及其对油麦菜的影响

施玲芳1,2,张润花1,谢言兰1,2,黄兴学1,曹秀鹏1,2,周国林1   

  1. (1.武汉市农业科学院蔬菜研究所,湖北 武汉 430300;2.华中农业大学园艺林学学院,湖北 武汉 430070)
  • 收稿日期:2022-11-10 出版日期:2023-02-15 发布日期:2023-04-03
  • 通讯作者: 周国林(1971-),男,湖北汉川人,高级农艺师,硕士,主要从事蔬菜育种、安全生产技术研究。E-mail:glzhou@126.com
  • 作者简介:施玲芳(1999-),女,湖北宜都人,在读硕士研究生,研究方向:土壤重金属污染修复与农业废弃物资源化利用。E-mail:shilingfang0305@163.com
  • 基金资助:
    国家自然科学基金项目(31201618);武汉市农业科学院创新体系项目(CXJSFW202101-2);国家现代农业产业技术体系项目(CARS-23-G27)

Mechanism of Cadmium‑Lead Adsorption of Sulfur‑Modified Biochar and Its Effect on Lettuce

SHI Lingfang1,2,ZHANG Runhua1,XIE Yanlan1,2,HUANG Xingxue1,CAO Xiupeng1,2,ZHOU Guolin1   

  1. (1.Institute of Vegetable Research,Wuhan Academy of Agricultural Sciences,Wuhan 430300,China;2.College of Horticulture and Forestry,Huazhong Agricultural University,Wuhan 430070,China)
  • Received:2022-11-10 Published:2023-02-15 Online:2023-04-03

摘要: 为探究硫改性生物炭对镉(Cd)和铅(Pb)污染土壤的吸附机制及其对油麦菜的影响,将新鲜玉米秸秆生物炭(FBC)经过氢氧化钠和二硫化碳改性后得到硫改性生物炭(SBC),通过元素分析仪、扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和等温吸附试验探究FBC和SBC对Cd和Pb的吸附特性;以油麦菜为供试材料进行盆栽试验,探究2种生物炭对植物生长的影响。结果表明,通过生物炭的表征证实了SBC中成功引入了巯基官能团。和FBC相比,SBC的比表面积和孔容分别增加了39.97%、31.25%,其对Cd和Pb的吸附量增加46.81%、21.95%,土壤中Cd、Pb的有机结合态和Cd的残渣态分别提高了6.98%、23.23%、38.14%。此外,与施用FBC相比,施用SBC油麦菜根部的Cd和Pb含量分别降低了40.00%、23.61%,说明SBC提高了生物炭固定重金属的稳定性和油麦菜的安全品质。

关键词: 生物炭, 硫改性, 重金属污染, 油麦菜

Abstract: To investigate the adsorption mechanism of sulfur‑modified biochar on cadmium(Cd)and lead(Pb) contaminated soil and its effect on lettuce,sulfur‑modified biochar(SBC) was obtained by modifying fresh corn straw biochar(FBC)with NaOH and CS2. The adsorption characteristics of FBC and SBC on Cd and Pb were investigated by elemental analyzer,scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X‑ray photoelectron spectroscopy(XPS) and isothermal adsorption test.Pot experiments were conducted with lettuce as the test material to investigate the effects of the two kinds of biochar on plant growth.The characterization of biochar confirmed that the sulfhydryl functional group was successfully introduced into SBC. Compared with FBC,the specific surface area and pore volume of SBC increased by 39.97% and 31.25% respectively,and its adsorption capacity for Cd and Pb increased by 46.81% and 21.95%,the organic binding state and residue state of Cd and Pb in the soil increased by 6.98%,23.23% and 38.14% respectively.In addition,compared with the application of FBC,the content of Cd and Pb in the roots of lettuce with the application of SBC decreased by 40.00% and 23.61% respectively,indicating that SBC improved the stability of heavy metal fixation by biochar and the safety quality of lettuce.

Key words: Biochar, Sulfur modification, Heavy metal pollution, Lettuce

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