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| Comparison of copper adsorption onto unmodified and nano-hydroxyapatite-modified wheat straw biochar |
| Received:April 11, 2017 |
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| KeyWord:nano-hydroxyapatite;wheat straw;biochar;Cu2+;adsorption |
| Author Name | Affiliation | E-mail | | 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 | | | ZHAO Jing-jing | 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 | | | CHU Long-gang | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | YIN Ying-jie | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | CHEN Chong | 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: |
| To improve wheat straw biochar's removal ability of copper from polluted water and soils, wheat straw biochar was modified using nano-hydroxyapatite. The characteristics of unmodified and nano-hydroxyapatite-modified wheat straw biochars were analyzed, and batch and kinetic adsorption experiments were conducted. The results showed that the nano-hydroxyapatite coating was uniformly attached to the surface and improved the thermal stability of the wheat straw biochar. All three concentrations of the nano-hydroxyapatite coating decreased the hydrophobicity of the biochar. The nano-hydroxyapatite coating increased the adsorption rate of copper by 7.69%~130.77%. The maximum adsorption capacity of nano-hydroxyapatite-modified wheat straw biochar increased from 32.65 mg·g-1 without coating to 57.01 mg·g-1 with 0.5% coating. Copper adsorption onto unmodified and nano-hydroxyapatite-modified wheat straw biochars were well fitted by the pseudo-second-order kinetics and Langmuir adsorption models. |
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