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Nguyen-Thi NY, Nguyen CQ, Le Dang Q, De Tran Q, Do-Thi TN, Vu Thanh LH. Extracting lignin from sugarcane bagasse for methylene blue and hexavalent chromium adsorption in textile wastewater: a facile, green, and sustainable approach. RSC Adv 2024; 14:4533-4542. [PMID: 38312723 PMCID: PMC10835761 DOI: 10.1039/d3ra08007b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 01/16/2024] [Indexed: 02/06/2024] Open
Abstract
This study presents the process of extracting lignin from sugarcane bagasse collected in the Mekong Delta, Vietnam by the alkali method. NaOH has been used as an effective, environmentally friendly chemical to enhance the extraction process. The obtained lignin was applied for methylene blue (MB) and hexavalent chromium (Cr(vi)) removal. Factors influencing lignin extraction and adsorption processes of MB and Cr(vi) were investigated, showcasing the sustainable reusability of lignin extracted from sugarcane bagasse. Lignin characterization was also carried out by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) techniques. The results showed that the extracted lignin content reached 38.61% under optimal conditions (NaOH concentration of 10%, reaction temperature of 90 °C and reaction time of 90 min). The adsorption efficiency and capacity of lignin reached 90.90% and 9.09 mg g-1 for MB and 80.10% and 28.04 mg g-1 for Cr(vi), respectively, under optimum adsorption conditions (pH, adsorption time, initial methylene blue concentration, and used lignin content). The adsorption process obeyed Langmuir adsorption and was principally physical adsorption. These findings prove sugarcane bagasse based lignin as a cheap and efficient adsorbent for MB and Cr(vi) removal, which contributes to the utilization of the abundant agricultural by-product for wastewater treatment.
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Affiliation(s)
- Nhu Y Nguyen-Thi
- Can Tho University of Technology Can Tho 94000 Vietnam +84-909-163-385
| | - Cuong Quoc Nguyen
- Department of Chemistry, College of Natural Sciences, Can Tho University Can Tho 94000 Vietnam
| | - Quang Le Dang
- Institute for Tropical Technology, Vietnam Academy of Science and Technology Hanoi 10072 Vietnam
| | - Quang De Tran
- Department of Chemistry, College of Natural Sciences, Can Tho University Can Tho 94000 Vietnam
| | | | - Luong Huynh Vu Thanh
- Department of Chemical Engineering, College of Engineering, Can Tho University Can Tho 94000 Vietnam
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Zhu G, Ye D, Chen X, Wu Y, Yang Z, Mai Y, Liao B, Chen J. Lignin-derived polyphenols with enhanced antioxidant activities by chemical demethylation and their structure-activity relationship. Int J Biol Macromol 2023; 237:124030. [PMID: 36921813 DOI: 10.1016/j.ijbiomac.2023.124030] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/06/2023] [Accepted: 03/08/2023] [Indexed: 03/14/2023]
Abstract
Lignin valorization to biobased polyphenols antioxidants is increasingly attractive in the modern industry due to their inherent phenolic structures. Herein, lignin-derived polyphenols with enhanced antioxidant activities were prepared from the most available technical lignin including organosolv lignin (OL), alkali lignin (AL), and enzyme lignin (EL) by iodocyclohexane (ICH) chemical demethylation. The structural evolution of lignin indicated that the CAr-OCH3 group and the CAr-O-Calkyl side-chain could be effectively transformed into the CAr-OH group, resulting in a significant increase of the phenolic-OH content and a slight decrease of the molecular weight. The 1,1-diphenyl-2-picrylhydrazyl radical (DPPH·) scavenging activity was in the order of ICHOL-24 > ICHAL-24 > ICHEL-24 ≈ FA > BHT, and the IC50 value of ICHOL-24 was 0.56 times lower than that of BHT. The structure-activity relationship demonstrated the activities were quasi-linearly related to phenolic-OH contents and could be affected by molecular weights. The H/G/S proportions of lignin could be an indicator for accurate screening of efficient lignin-derived polyphenols antioxidants (LPA). It was preliminarily estimated to have economic feasibility for producing LPA from technical lignin by demethylation compared with synthetic or natural antioxidants. This work will help to develop efficient biobased antioxidants for lignin valorization.
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Affiliation(s)
- Guozhi Zhu
- Guangdong Provincial Key Laboratory of Industrial Surfactant, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, Guangdong, PR China
| | - Dawei Ye
- Guangdong Provincial Key Laboratory of Industrial Surfactant, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, Guangdong, PR China.
| | - Xiaotian Chen
- Guangdong Provincial Key Laboratory of Industrial Surfactant, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, Guangdong, PR China
| | - Yuchao Wu
- Guangdong Provincial Key Laboratory of Industrial Surfactant, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, Guangdong, PR China
| | - Zongmei Yang
- Guangdong Provincial Key Laboratory of Industrial Surfactant, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, Guangdong, PR China
| | - Yuliang Mai
- Guangdong Provincial Key Laboratory of Industrial Surfactant, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, Guangdong, PR China
| | - Bing Liao
- Guangdong Academy of Sciences, Guangzhou 510070, Guangdong, PR China.
| | - Jiazhi Chen
- Guangdong Provincial Key Laboratory of Industrial Surfactant, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, Guangdong, PR China.
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