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Su N. Spherical Polyelectrolyte Brushes as Flocculants and Retention Aids in Wet-End Papermaking. Molecules 2023; 28:7984. [PMID: 38138474 PMCID: PMC10745445 DOI: 10.3390/molecules28247984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/02/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
As the criteria of energy conservation, emission reduction, and environmental protection become more important, and with the development of wet-end papermaking, developing excellent retention aids is of great significance. Spherical polyelectrolyte brushes (SPBs) bearing polyelectrolyte chains grafted densely to the surface of core particle have the potential to be novel retention aids in wet-end papermaking not only because of their spherical structure, but also due to controllable grafting density and molecular weight. Such characteristics are crucial in order to design multi-functional retention aids in sophisticated papermaking systems. This review presents some important recent advances with respect to retention aids, including single-component system and dual-component systems. Then, basic theory in papermaking is also briefly reviewed. Based on these advances, it emphatically describes spherical polyelectrolyte brushes, focused on their preparation methods, characterization, conformation, and applications in papermaking. This work is expected to contribute to improve a comprehensive understanding on the composition, properties, and function mechanisms of retention aids, which helps in the further investigation on the design of novel retention aids with excellent performance.
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Affiliation(s)
- Na Su
- Department of Printing and Packaging Engineering, Shanghai Publishing and Printing College, Shanghai 200093, China
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Matebese F, Moutloali RM. Integrating Ultrafiltration Membranes with Flocculation and Activated Carbon Pretreatment Processes for Membrane Fouling Mitigation and Metal Ion Removal from Wastewater. ACS OMEGA 2023; 8:9074-9085. [PMID: 36936310 PMCID: PMC10018693 DOI: 10.1021/acsomega.2c03524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 09/29/2022] [Indexed: 06/18/2023]
Abstract
The presence of metal ions in an aqueous medium is an ongoing challenge throughout the world. Processes employed for metal ion removal are developed continuously with the integration of these processes taking center stage. Herein, an integrated system consisting of flocculation, activated carbon (AC), and an ultrafiltration (UF) membrane was assessed for the removal of multiple metal ions contained in wastewater generated from a university chemistry research laboratory. The quality of the wastewater was established before and further determined after treatment with inductively coupled plasma optical emission spectrometry (ICP-OES) for metal content, total dissolved solids (TDS), turbidity, electrical conductivity (EC), and pH. Assessing the spent AC indicated minimal structural changes, indicating a potential for further reuse; for instance, the BET for both the pristine and spent AC exhibited type I isotherms with a mesoporous structure, indicating no major structural changes due to metal complexation. The relative performance of the integrated system indicated that the use of flocculation improved the water quality of metal-laden wastewater for safe disposal. The integrated treatment systems exhibited high removal efficiencies between 80 and 99.99% for all the metal ions except for Mn (<0.008 mg L-1) and Cr (<0.016 mg L-1) both at ca. 70%, indicative of the positive influence of the polyelectrolyte in the treatment process. The fabricated UiO-66-NH2@GO membranes (Z4 and Z5) exhibited high fouling resistance and reusability potential as well as relatively high pure water flux. Consequently, the integrated process employed for the treatment of laboratory metal-containing wastewater is promising as a generic approach to improving the quality of metal-containing wastewater to meet the standards of discharging limits in South Africa.
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Affiliation(s)
- Funeka Matebese
- Department
of Chemical Sciences, Faculty of Science, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028Johannesburg, South Africa
- DSI/Mintek
Nanotechnology Innovation Center−UJ Water Research Node, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028Johannesburg, South Africa
| | - Richard M. Moutloali
- Institute
for Nanotechnology and Water Sustainability, College of Science, Engineering
and Technology, University of South Africa, Florida, 1709Johannesburg, South Africa
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Wang Y, Chen X, Wu B, Ma T, Jiang H, Mi Y, Jiang C, Zang H, Zhao X, Li C. Potential and mechanism for bioremediation of papermaking black liquor by a psychrotrophic lignin-degrading bacterium, Arthrobacter sp. C2. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129534. [PMID: 35850064 DOI: 10.1016/j.jhazmat.2022.129534] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 06/23/2022] [Accepted: 07/02/2022] [Indexed: 06/15/2023]
Abstract
To meet the challenge of bioremediation of black liquor in pulp and paper mills at low temperatures, a psychrotrophic lignin-degrading bacterium was employed in black liquor treatment for the first time. In this study, Arthrobacter sp. C2 exhibited excellent cold adaptability and lignin degradation ability, with a lignin degradation rate of 65.5% and a mineralization rate of 43.9% for 3 g/L lignin at 15 °C. Bioinformatics analysis and multiple experiments confirmed that cold shock protein 1 (Csp1) was the dominant cold regulator of strain C2, and dye-decolorizing peroxidase (DyP) played a crucial role in lignin degradation. Moreover, structural equation modeling (SEM), mRNA monitoring, and phenotypic variation analysis demonstrated that Csp1 not only mediated cold adaptation but also modulated DyP activity by controlling dyp gene expression, thus driving lignin depolymerization for strain C2 at low temperatures. Furthermore, 96.4% of color, 64.2% of chemical oxygen demand (COD), and 100% of nitrate nitrogen (NO₃--N) were removed from papermaking black liquor by strain C2 within 15 days at 15 °C. This study provides insights into the association between the cold regulator and catalytic enzyme of psychrotrophic bacteria and offers a feasible alternative strategy for the bioremediation of papermaking black liquor in cold regions.
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Affiliation(s)
- Yue Wang
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Xi Chen
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Bowen Wu
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Tian Ma
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Hanyi Jiang
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Yaozu Mi
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Cheng Jiang
- College of Life Sciences, Resources and Environment, Yichun University, Yichun 336000, Jiangxi, PR China
| | - Hailian Zang
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Xinyue Zhao
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China
| | - Chunyan Li
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, Heilongjiang, PR China.
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