Adsorption of Strontium onto Adaxial and Abaxial Cuticle of Photinia serrulata Leaf
Abstract
:1. Introduction
2. Material and Methods
2.1. Samples Collection
2.2. The Characterization of Abaxial and Adaxial Cuticles
2.3. Batch Adsorption Experiment
2.4. Data Analysis
3. Results and Discussion
3.1. The Characterizations of Cuticles
3.2. Adsorption Kinetics
3.3. Adsorption Isotherm
3.4. Effect of pH on Sr Adsorption
3.5. FTIR Spectra of the Cuticles before and after Loading with Sr
4. Conclusions
- The elemental composition and FTIR spectra for both adaxial and abaxial 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). Adsorption of Sr onto adaxial and abaxial cuticles was up to equilibrium with 10 min, and both adsorption isotherms fit well with Langmuir model (R2, 0.97 and 0.97).
- Neither adaxial nor abaxial cuticles play a negative role on the absorption of nuclide which was usually considered to be a barrier for the foliar uptake of pollutants, but showed a strong retention capacity for the nuclides in the environment. The maximum adsorption capacity of PAC was 12.1 mg·g−1, little higher than that of PBC (10.3 mg·g−1).
- The adsorption of Sr increased with the increase of pH, and the maximum was attained when pH ≥ 4. Electrostatic attraction was demonstrated to be the main mechanism of Sr adsorption onto PAC and PBC, and the similar adsorption of adaxial and abaxial cuticles was consistent with their similar isoelectric point (≈ 2).
- Importantly, the characteristic functional groups in the abaxial and adaxial foliar cuticles did not change before and after the adsorption for Sr, suggesting that there was no chemical precipitation in the adsorption of cuticles for Sr.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | Yield/%a | C/% | H/% | N/% | O/%b | H/C | (O + N)/C |
---|---|---|---|---|---|---|---|
adaxial cuticle | 7.01 | 56.88 | 7.55 | 0.45 | 35.12 | 1.59 | 0.47 |
abaxial cuticle | 5.78 | 55.60 | 7.63 | 0.45 | 36.32 | 1.65 | 0.50 |
Sample | Langmuir Regression Parameters | Freundlich Regression Parameters | ||||
---|---|---|---|---|---|---|
KL/(L·mg−1) | Qmax/(mg·g−1) | R2 | Kf/(mg/g)/(mg/L)N | N | R2 | |
PAC PBC | 0.125 ± 0.023 | 12.1 ± 0.71 | 0.97 | 2.15 ± 0.32 | 0.415 ± 0.044 | 0.92 |
0.109 ± 0.021 | 10.3 ± 0.64 | 0.97 | 1.76 ± 0.20 | 0.417 ± 0.032 | 0.96 |
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Li, Y.; Luo, X.; Bai, X.; Lv, W.; Liao, Y. Adsorption of Strontium onto Adaxial and Abaxial Cuticle of Photinia serrulata Leaf. Int. J. Environ. Res. Public Health 2020, 17, 1061. https://doi.org/10.3390/ijerph17031061
Li Y, Luo X, Bai X, Lv W, Liao Y. Adsorption of Strontium onto Adaxial and Abaxial Cuticle of Photinia serrulata Leaf. International Journal of Environmental Research and Public Health. 2020; 17(3):1061. https://doi.org/10.3390/ijerph17031061
Chicago/Turabian StyleLi, Yungui, Xiang Luo, Xueying Bai, Wenxuan Lv, and Yang Liao. 2020. "Adsorption of Strontium onto Adaxial and Abaxial Cuticle of Photinia serrulata Leaf" International Journal of Environmental Research and Public Health 17, no. 3: 1061. https://doi.org/10.3390/ijerph17031061