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Wu Q, Zhang H, Zhou Y, Tang Z, Li B, Fu T, Zhang Y, Zhu H. Core-Shell Structured Carbon@Al 2O 3 Membrane with Enhanced Acid Resistance for Acid Solution Treatment. MEMBRANES 2022; 12:1246. [PMID: 36557154 PMCID: PMC9784977 DOI: 10.3390/membranes12121246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/29/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
Ceramic membrane has an important application prospect in industrial acid solution treatment. Enhancement of the acid resistance is the key strategy to optimize the membrane treatment effect. This work reports a core-shell structured membrane fabricated on alumina ceramic substrates via a one-step in situ hydrothermal method. The acid resistance of the modified membrane was significantly improved due to the protection provided by a chemically stable carbon layer. After modification, the masses lost by the membrane in the hydrochloric acid solution and the acetic acid solution were sharply reduced by 90.91% and 76.92%, respectively. Kinetic models and isotherm models of adsorption were employed to describe acid adsorption occurring during the membrane process and indicated that the modified membrane exhibited pseudo-second-order kinetics and Langmuir model adsorption. Compared to the pristine membrane, the faster adsorption speed and the lower adsorption capacity were exhibited by the modified membrane, which further had a good performance with treating various kinds of acid solutions. Moreover, the modified membrane could be recycled without obvious flux decay. This modification method provides a facile and efficient strategy for the fabrication of acid-resistant membranes for use in extreme conditions.
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Affiliation(s)
- Qianlian Wu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Jiangsu Botanical Medicine Refinement Engineering Research Center, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Huimiao Zhang
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Jiangsu Botanical Medicine Refinement Engineering Research Center, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Yi Zhou
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Jiangsu Botanical Medicine Refinement Engineering Research Center, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Zhishu Tang
- State Key Laboratory of Research & Development of Characteristic Qin Medicine Resources, Shaanxi University of Chinese Medicine, Xianyang 712038, China
- China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Bo Li
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Jiangsu Botanical Medicine Refinement Engineering Research Center, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Tingming Fu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Jiangsu Botanical Medicine Refinement Engineering Research Center, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Yue Zhang
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Jiangsu Botanical Medicine Refinement Engineering Research Center, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Huaxu Zhu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Jiangsu Botanical Medicine Refinement Engineering Research Center, Nanjing University of Chinese Medicine, Nanjing 210023, China
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Liu T, Chen Z, Li Z, Fu H, Chen G, Feng T, Chen Z. Preparation of magnetic hydrochar derived from iron-rich Phytolacca acinosa Roxb. for Cd removal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 769:145159. [PMID: 33482558 DOI: 10.1016/j.scitotenv.2021.145159] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 01/04/2021] [Accepted: 01/07/2021] [Indexed: 05/28/2023]
Abstract
Considering that hyperaccumulators can accumulate high concentrations of iron salt, they can successfully obtain magnetic hydrochar from iron-rich hyperaccumulators. In this study, iron-rich biomass was obtained by irrigating Phytolacca acinosa Roxb. using iron salt. Magnetic nano-Fe3O4 hydrochar was prepared from iron-rich Phytolacca acinosa Roxb. via hydrothermal carbonization to remove Cd. The characterization results showed that the synthesized magnetic nanoparticles had an average size of 2.62 ± 0.56 nm and N elements were doped into magnetic nano-Fe3O4 hydrochar with abundant oxygenic groups. Cd adsorption on magnetic nano-Fe3O4 hydrochar was better fitted using the Langmuir isotherm and the pseudo-second-order kinetic model. The maximum adsorption capacity was 246.6 mg g-1 of Cd. The research confirmed that Cd adsorption was controlled by multiple mechanisms from the jar test, transmission electron microscopy mapping, scanning electron microscopy-energy dispersive X-ray spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. CdCO3 crystals can be formed after adsorption, indicating that surface precipitation played an important role in Cd adsorption. The abundance of O atoms and the doping of N atoms on the hydrochar surface were conducive to Cd adsorption, indicating that the mechanisms were related to surface complexation and electrostatic attraction. In addition, the significant decrease in Na+ content after Cd adsorption illustrated that ion exchange had a non-negligible effect on Cd adsorption. This study not only provides a strategy for preparing magnetic nano-Fe3O4 hydrochar derived from iron-rich plants but also verifies multiple Cd adsorption mechanisms using magnetic nano-Fe3O4 hydrochar.
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Affiliation(s)
- Tao Liu
- Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
| | - Zhenshan Chen
- Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
| | - Zhixian Li
- Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
| | - Hao Fu
- School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
| | - Guoliang Chen
- Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
| | - Tao Feng
- Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
| | - Zhang Chen
- Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China.
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