Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
Stockbridge School of Agriculture, University of Massachusetts Amherst, Amherst, MA, 01003, USA.
Environ Sci Pollut Res Int. 2021 May;28(17):21276-21284. doi: 10.1007/s11356-020-12027-w. Epub 2021 Jan 7.
In the present study, graphitic carbon nitride (g-CN) was synthesized in a tube furnace and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR). Different concentrations (0-200 mg/L) of g-CN were prepared in nutrient solution amended with or without 20 mg/L CdCl for the greenhouse study. Rice seedlings were exposed to g-CN and Cd for 20 days. Our results suggest that 200 mg/L g-CN significantly increased the fresh weight and root and shoot length as compared with the control, and notably alleviated Cd-induced toxicity. The addition of 200 mg/L g-CN significantly reduced the root and shoot Cd content by approximately 14% and 23%, respectively. In addition, 200 mg/L g-CN significantly elevated the nitrogen content and decreased C/N ration in rice shoots; most importantly, it alleviated Cd-induced nitrogen reduction. Our findings demonstrated the potential of g-CN in regulating plant growth and minimizing the Cd-induced phytotoxicity, and shed light on providing a new strategy to maintain heavy metal contamination in agriculture using a low-cost and environmental friendly NMs.
在本研究中，采用管式炉合成了石墨相氮化碳（g-CN），并通过扫描电子显微镜（SEM）、X 射线衍射（XRD）和傅里叶变换红外（FTIR）进行了表征。在添加或不添加 20 mg/L CdCl 的营养液中制备了不同浓度（0-200 mg/L）的 g-CN，用于温室研究。将水稻幼苗暴露于 g-CN 和 Cd 中 20 天。我们的结果表明，与对照组相比，200 mg/L g-CN 可显著增加鲜重以及根和茎的长度，并显著减轻 Cd 诱导的毒性。添加 200 mg/L g-CN 可使根和茎中的 Cd 含量分别降低约 14%和 23%。此外，200 mg/L g-CN 可显著提高水稻茎中的氮含量并降低 C/N 比；最重要的是，它可减轻 Cd 诱导的氮减少。我们的研究结果表明 g-CN 具有调节植物生长和最小化 Cd 诱导的植物毒性的潜力，并为使用低成本和环保型纳米材料维持农业中重金属污染提供了新的策略。
