Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, China.
Sichuan Provincial Sci-Tech Cooperation Base of Low-cost Wastewater Treatment Technology, Southwest University of Science and Technology, Mianyang 621010, China.
Int J Environ Res Public Health. 2020 Feb 7;17(3):1061. doi: 10.3390/ijerph17031061.
Leaf cuticle sorption is one important process for the uptake of environment pollutants in plants, and mixed powder including adaxial and abaxial cuticle is generally used to demonstrate the sorption behavior. However, the difference of adaxial and abaxial cuticle on plant cuticle sorption is not well understood. Abaxial cuticle (PAC) and adaxial cuticle (PBC) were isolated from hypostomatic to investigate their adsorption of a model radionuclide (strontium). The elemental composition and FTIR spectra for two cuticles were quite similar and both show high affinity (H/C, 1.59 and 1.65) and polarity ((O + N)/C, 0.470 and 0.499). Both adsorption isotherms fit well with Langmuir model (, 0.97 and 0.97), and the maximum adsorption capacity of PAC was 12.1 mg/g, little higher than that of PBC (10.3 mg/g). Adsorption of strontium increased with the increase of pH, and the maximum was attained when pH ≥4. Electrostatic attraction was demonstrated to be the main mechanism of -strontium adsorption onto PAC and PBC, and the similar adsorption of adaxial and abaxial cuticle was consistent with their similar isoelectric point.
叶片角质层的吸附是植物吸收环境污染物的一个重要过程，通常使用包括上表皮和下表皮的混合粉末来展示吸附行为。然而，植物角质层的上表皮和下表皮在吸附方面的差异尚未得到很好的理解。本研究从下表皮中分离出下表皮（PAC）和上表皮（PBC），以研究它们对模型放射性核素（锶）的吸附作用。两种角质层的元素组成和傅里叶变换红外（FTIR）光谱非常相似，均表现出较高的亲和力（H/C，1.59 和 1.65）和极性（（O + N）/C，0.470 和 0.499）。两种吸附等温线均很好地符合朗缪尔模型（，0.97 和 0.97），PAC 的最大吸附容量为 12.1 mg/g，略高于 PBC（10.3 mg/g）。锶的吸附随 pH 值的增加而增加，当 pH≥4 时达到最大值。静电吸引被证明是 -锶吸附到 PAC 和 PBC 上的主要机制，上表皮和下表皮的相似吸附与它们相似的等电点一致。
