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Zhou Y, Zhang X, Deng J, Li C, Sun K, Luo X, Yuan S. Adsorption and mechanism study for phenol removal by 10% CO 2 activated bio-char after acid or alkali pretreatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 348:119317. [PMID: 37857218 DOI: 10.1016/j.jenvman.2023.119317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 09/26/2023] [Accepted: 10/06/2023] [Indexed: 10/21/2023]
Abstract
The development of an efficient bio-char used to remove phenol from wastewater holds great importance for environmental protection. In this work, wheat straw bio-char (BC) was acid-washed by HF and activated at 900 °C with 10% CO2 to obtain bio-char (B-Ⅲ-0.1D900). Adsorption experiments revealed that B-Ⅲ-0.1D900 achieved a remarkable phenol removal efficiency of 90% within 40 min. Despite its relatively low specific surface area of 492.60 m2/g, it exhibited a high maximum adsorption capacity of 471.16 mg/g. Furthermore, B-Ⅲ-0.1D900 demonstrated a good regeneration capacity for at least three cycles (90.71%, 87.54%, 84.36%). It has been discovered that HF washing, which removes AAEM and exposes unsaturated functional groups, constitutes one of the essential prerequisites for enhancing CO2 activation efficiency at high temperatures. After 10% CO2 activation, the mesoporous structure exhibited substantial development, facilitating enhanced phenol infiltration into the pores when compared to untreated BC. The increased branching of the bio-char culminated in a more complete aromatic system, which enhances the π-π forces between the bio-char and the phenol. The presence of tertiary alcohol structure enhances the hydrogen bonding forces, thereby promoting intermolecular multilayer adsorption of phenol. With the combination of various forces, B-Ⅲ-0.1D900 has a good removal capacity for phenol. This work provides valuable insights into the adsorption of organic pollutants using activated bio-char.
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Affiliation(s)
- Yujie Zhou
- School of Chemical Science and Engineering, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, National Center for Experimental Chemistry and Chemical Engineering Education Demonstration, Yunnan Provincial Key Laboratory of Carbon Neutral and Green Low-Carbon Technology, Yunnan University, No. 2, Cuihu North Road, 650091 Kunming, Yunnan, China
| | - Xiaoguo Zhang
- School of Chemical Science and Engineering, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, National Center for Experimental Chemistry and Chemical Engineering Education Demonstration, Yunnan Provincial Key Laboratory of Carbon Neutral and Green Low-Carbon Technology, Yunnan University, No. 2, Cuihu North Road, 650091 Kunming, Yunnan, China
| | - Jin Deng
- School of Chemical Science and Engineering, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, National Center for Experimental Chemistry and Chemical Engineering Education Demonstration, Yunnan Provincial Key Laboratory of Carbon Neutral and Green Low-Carbon Technology, Yunnan University, No. 2, Cuihu North Road, 650091 Kunming, Yunnan, China
| | - Chun Li
- School of Chemical Science and Engineering, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, National Center for Experimental Chemistry and Chemical Engineering Education Demonstration, Yunnan Provincial Key Laboratory of Carbon Neutral and Green Low-Carbon Technology, Yunnan University, No. 2, Cuihu North Road, 650091 Kunming, Yunnan, China
| | - Keyuan Sun
- School of Chemical Science and Engineering, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, National Center for Experimental Chemistry and Chemical Engineering Education Demonstration, Yunnan Provincial Key Laboratory of Carbon Neutral and Green Low-Carbon Technology, Yunnan University, No. 2, Cuihu North Road, 650091 Kunming, Yunnan, China
| | - Xiaodong Luo
- School of Chemical Science and Engineering, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, National Center for Experimental Chemistry and Chemical Engineering Education Demonstration, Yunnan Provincial Key Laboratory of Carbon Neutral and Green Low-Carbon Technology, Yunnan University, No. 2, Cuihu North Road, 650091 Kunming, Yunnan, China
| | - Shenfu Yuan
- School of Chemical Science and Engineering, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, National Center for Experimental Chemistry and Chemical Engineering Education Demonstration, Yunnan Provincial Key Laboratory of Carbon Neutral and Green Low-Carbon Technology, Yunnan University, No. 2, Cuihu North Road, 650091 Kunming, Yunnan, China.
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Sun H, Ma X, Fei L, Cao Z, Zhong H, Wang S. Amide group enhanced self-assembly and adsorption of dicarboxylic amino acid surfactants on a rhodochrosite surface through intermolecular weak interaction. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Ma M, Wang W, Zhang K. Occurrence Characteristics of Fine-Grained Pyrite in Coal and Its Scaling Effect on Flotation Desulfurization. ACS OMEGA 2022; 7:42467-42481. [PMID: 36440164 PMCID: PMC9685748 DOI: 10.1021/acsomega.2c05698] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 11/02/2022] [Indexed: 05/24/2023]
Abstract
To explore the occurrence and distribution characteristics of fine-grained pyrites in coal and the effect of pyrite particle size on flotation efficiency, coal samples from Guizhou province and Shanxi province, China, were selected for pyrite morphology observation and sulfur content test before and after flotation desulfurization experiments with different coal particle sizes. Experimental results showed that the fine-grained fine pyrites in coal have various occurrence forms and complex connections with the coal matrix. The fragmentation process can change the distribution of pyrite content in coal. Flotation desulfurization experiments showed that the sum of pyrite content in the cleaned coal and middlings gradually became significantly higher in coal particles with size 15-37 μm compared with particle sizes 37-44 and 44-75 μm. The complex occurrence morphology and crystal structure of fine-grained pyrite make it difficult to be removed from the coal matrix by ore grinding during flotation. Fine-grained pyrite mainly occurs in the form of framboïdal pyrite, disseminated pyrite, and monomer pyrite with a size of 0.69-33.94 μm in the middlings and cleaned coal. Therefore, 37 μm is considered as the critical dimension for ore grinding to improve the effective flotation desulphurization efficiency in this study, and some more effective methods should be used to increase the desulfurization efficiency of fine-grained pyrite.
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Affiliation(s)
- Mengya Ma
- Key
Laboratory of Coalbed Methane Resources & Reservoir Formation
Process, Ministry of Education, China University
of Mining and Technology, Xuzhou221008, Jiangsu, China
- School
of Resources and Geosciences, China University
of Mining and Technology, Xuzhou221116, Jiangsu, China
| | - Wenfeng Wang
- Key
Laboratory of Coalbed Methane Resources & Reservoir Formation
Process, Ministry of Education, China University
of Mining and Technology, Xuzhou221008, Jiangsu, China
- School
of Resources and Geosciences, China University
of Mining and Technology, Xuzhou221116, Jiangsu, China
| | - Kun Zhang
- State
Key Laboratory of Mining Response and Disaster Prevention and Control
in Deep Coal Mines, Anhui University of
Science and Technology, Huainan232001, Anhui, China
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