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21 results on '"Liu, Ruichun"'

17. Sorption mechanisms of lead on soil-derived black carbon formed under varying cultivation systems

Author

Zhao, Qingjie, Li, Jianhong, Sarkar, Binoy, Wu, Weidong, Li, Boling, Liu, Ruichun, Nawaz, Mohsin, Zia-ur-Rehman, Muhammad, Wang, Hailong, Wu, Zhipeng, Zhao, Qingjie, Li, Jianhong, Sarkar, Binoy, Wu, Weidong, Li, Boling, Liu, Ruichun, Nawaz, Mohsin, Zia-ur-Rehman, Muhammad, Wang, Hailong, and Wu, Zhipeng

Abstract

The knowledge about lead (Pb) sorption on soil-derived black carbons (SBCs) under different cultivation intensities of soils is limited. In this study, chemical and spectroscopic methods were applied to investigate the Pb sorption mechanisms on SBCs in soils from a forest land, a rubber plantation area, and a vegetable farm with none, less and highly intensive cultivation, respectively, that are located in the Hainan Island of China. Results showed that the specific surface area and cation exchange capacity of the SBCs from the less and highly intensive cultivation soils were 4.5- and 2.7-fold, and 1.3- and 1.8-fold higher compared to that of SBC from the no-cultivation soil, which subsequently enhanced the Pb sorption capacities of SBCs in iron exchange fraction. Ion exchange and hydrogen bonded Pb fractions together accounted for about 80% of total Pb sorbed on all SBCs at an externally added 1000 mg L−1 Pb solution concentration. The Odouble bondC–O groups also played key roles in Pb sorption by forming complexes of Odouble bondC–O–Pb–O and/or Odouble bondC–O–Pb. Overall, SBCs in soils under all studied cultivation intensities showed high potential to sorb Pb (with the maximum absorbed Pb amount of 46.0–91.3 mg g−1), and increased Pb sorption capacities of the studied soils by 18.7–21.1 mg kg−1 in the stable fraction (complexation). Therefore, SBC might be a potential environment-friendly material to enhance the Pb immobilization capacity of soil.

Published
2020

21. Sorption mechanisms of lead on soil-derived black carbon formed under varying cultivation systems

Author

Muhammad Zia-ur-Rehman, Weidong Wu, Boling Li, Qingjie Zhao, Jianhong Li, Ruichun Liu, Mohsin Nawaz, Zhipeng Wu, Hailong Wang, Binoy Sarkar, Zhao, Qingjie, Li, Jianhong, Sarkar, Binoy, Wu, Weidong, Li, Boling, Liu, Ruichun, Nawaz, Mohsin, Zia-ur-Rehman, Muhammad, Wang, Hailong, and Wu, Zhipeng

Subjects
aging of organic carbon, China, Environmental Engineering, Health, Toxicology and Mutagenesis, Iron, 0208 environmental biotechnology, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, Soil, Natural rubber, Soot, Specific surface area, Biochar, XPS, Cation-exchange capacity, Environmental Chemistry, biochar, 0105 earth and related environmental sciences, Ion exchange, Chemistry, Public Health, Environmental and Occupational Health, Sorption, General Medicine, General Chemistry, Carbon black, Pollution, 020801 environmental engineering, Lead, visual_art, Environmental chemistry, Soil water, visual_art.visual_art_medium, Environmental Pollutants, Adsorption
Abstract

The knowledge about lead (Pb) sorption on soil-derived black carbons (SBCs) under different cultivation intensities of soils is limited. In this study, chemical and spectroscopic methods were applied to investigate the Pb sorption mechanisms on SBCs in soils from a forest land, a rubber plantation area, and a vegetable farm with none, less and highly intensive cultivation, respectively, that are located in the Hainan Island of China. Results showed that the specific surface area and cation exchange capacity of the SBCs from the less and highly intensive cultivation soils were 4.5- and 2.7-fold, and 1.3- and 1.8-fold higher compared to that of SBC from the no-cultivation soil, which subsequently enhanced the Pb sorption capacities of SBCs in iron exchange fraction. Ion exchange and hydrogen bonded Pb fractions together accounted for about 80% of total Pb sorbed on all SBCs at an externally added 1000 mg L−1 Pb solution concentration. The O[dbnd]C–O groups also played key roles in Pb sorption by forming complexes of O[dbnd]C–O–Pb–O and/or O[dbnd]C–O–Pb. Overall, SBCs in soils under all studied cultivation intensities showed high potential to sorb Pb (with the maximum absorbed Pb amount of 46.0–91.3 mg g−1), and increased Pb sorption capacities of the studied soils by 18.7–21.1 mg kg−1 in the stable fraction (complexation). Therefore, SBC might be a potential environment-friendly material to enhance the Pb immobilization capacity of soil Refereed/Peer-reviewed

Published
2020

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