Adsorption of Strontium onto Adaxial and Abaxial Cuticle of Photinia serrulata Leaf

Yungui Li, Xiang Luo, Xueying Bai, Wenxuan Lv and Yang Liao
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Yungui Li: Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Xiang Luo: Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Xueying Bai: Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Wenxuan Lv: Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Yang Liao: Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, China

IJERPH, 2020, vol. 17, issue 3, 1-11

Abstract: 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 Photinia serrulata 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 ( R 2 , 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.

Keywords: leaf cuticle; strontium; adsorption; adaxial; abaxial (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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