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| Adsorption capacity of surfactant-modified nano-hydroxyapatite for Cd2+ |
| Received:June 04, 2019 |
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| KeyWord:nano hydroxyapatite;SDBS modification;aggregation;adsorption;Cd2+ |
| Author Name | Affiliation | E-mail | | YIN Ying-jie | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | CHU Long-gang | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHU Si-hang | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | | | LI Yang | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | YAN Chao-rui | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | | | SHANG Jian-ying | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | jyshang@cau.edu.cn |
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| Abstract: |
| This study investigated the effect of the aggregation properties of nano-hydroxyapatite (nHAP) on its adsorption capacity. nHAP was modified by an anionic surfactant, sodium dodecyl benzene sulfonate (SDBS), to minimize its aggregation. Transmission electron microscopy (TEM), zetasizer, X ray diffraction (XRD), and fourier transform infrared spectroscopy (FTIR) were used to characterize the morphology and structure of nHAP. Then, the effect of SDBS modification on the adsorption capacity of nHAP was investigated using batch experiments and the possible mechanism of the effect of SDBS on nHAP adsorption of Cd2+ was examined. The results of the present study showed the particle size and hydrodynamic diameter (Dh) value of nHAP aggregates markedly decreased after SDBS modification. XRD and FTIR analysis indicated that the modification took place only on the surface of nHAP and a new functional group SO32- was introduced on the surface of nHAP, respectively. Adsorption kinetics of unmodified nHAP (B-HAP) and SDBS modified nHAP (S-HAP) were better described by the pseudo-second order model in comparison to the pseudo-first order model. The k2 value of S-HAP was 1.85 times that of BHAP. The isothermal adsorption process was more in line with the Freundlich model. The adsorption capacity of S-HAP for Cd2+ was higher than that of B-HAP as evident from the comparison of KF values. The mechanisms of SDBS modification which enhanced the adsorption capacity of nHAP mainly included:Modification of nHAP with SDBS increased the specific surface area of nHAP and minimized the aggregation of nHAP; Introduction of a new functional group on the surface of nHAP provided more adsorption sites for Cd2+. |
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