Oxidation of the manganese-substituted polyoxometalate [SiW(11)Mn(II)(H(2)O)O(39)](6-) (SiW(11)Mn(II)) to [SiW(11)Mn(III)(H(2)O)O(39)](5-) (SiW(11)Mn(III)), one of the most selective polyoxometalates for the kraft pulp delignification, by versatile peroxidase (VP) was studied. First, SiW(11)Mn(II) was demonstrated to be quickly oxidized by VP at room temperature in the presence of H(2)O(2) (K(m)=6.4+/-0.7 mM and k(cat)=47+/-2s(-1)). Second, the filtrate from eucalypt pulp delignification containing reduced polyoxometalate was treated with VP/H(2)O(2), and 95-100% reoxidation was attained. In this way, it was possible to reuse the liquor from a first SiW(11)Mn(III) stage for further delignification, in a sequence constituted by two polyoxometalate stages, and a short intermediate step consisting of the addition of VP/H(2)O(2) to the filtrate for SiW(11)Mn(II) reoxidation. When the first ClO(2) stage of a conventional bleaching sequence was substituted by the two-stage delignification with polyoxometalate (assisted by VP) a 50% saving in ClO(2) was obtained for similar mechanical strength of the final pulp.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.biortech.2010.02.093 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Carbon dioxide-mediated catalytic pyrolysis of lignin in syngas production.
Int J Biol Macromol
January 2025
Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea. Electronic address:
Kraft lignin (KL), a byproduct of the pulp and paper industry, is commonly combusted as a low-grade fuel. However, its high sulphur content results in the emission of sulphur oxides, which pose environmental hazards. This study explores a sustainable approach for the valorisation of waste KL into syngas via CO-mediated pyrolysis.
View Article and Find Full Text PDFLignin and black liquor based composite hydrogels for the enhanced adsorption of malachite green dye from aqueous solutions: Kinetics, rheology and isotherm studies.
Int J Biol Macromol
January 2025
Department of Chemical Engineering, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar 144008, Punjab, India.
Article Synopsis
- Effluent from the textile industry, particularly dye wastewater like malachite green, poses significant environmental risks, leading to increased research into sustainable dye removal methods.
- A hydrogel composite was developed using black liquor from corncobs and sodium alginate, achieving optimal dye adsorption at a 1:4 weight ratio, with a capacity of 650 mg/g for a dye concentration of 1500 mg/L.
- Characterization techniques confirmed high dye removal efficiencies (up to 95.54%) for both the black liquor/sodium alginate and alkaline lignin/sodium alginate hydrogels, with the adsorption kinetics fitting the pseudo-second-order model and a strong correlation to the Langmuir isotherm.
The morphology and structure of zero-valent iron nanosheets promote the activation of persulfate for degradation of ciprofloxacin.
Environ Res
January 2025
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457, PR China. Electronic address:
Herein, a biochar-supported zero-valent iron (ZVI) nanosheet catalyst (Fe@BC) for the activation of persulfate to degrade ciprofloxacin (CIP) was prepared using industrial kraft lignin and Fenton sludge as carbon and iron sources, respectively. Fe@BC showed considerably better CIP degradation efficiency (96.9% at 20 mg L) than traditional catalysts.
View Article and Find Full Text PDFBiocomposites Based on Mould Biomass and Waste Fibres for the Production of Agrotextiles: Technology Development, Material Characterization, and Agricultural Application.
Materials (Basel)
December 2024
Biotechnika Poland Sp. z o.o., Tymienieckiego 25, 90-350 Łódź, Poland.
This study explores the potential use of mould biomass and waste fibres for the production of agrotextiles. First, 20 mould strains were screened for efficient mycelium growth, with optimized conditions of temperature, sources of carbon and nitrogen in the medium, and type of culture (submerged or surface). A method was developed for creating a biocomposite based on the mould mycelium, reinforced with commercial bleached softwood kraft (BSK) pulp and fibre additives (cotton, hemp).
View Article and Find Full Text PDFDataset of some added-lignin thermoformed pulps.
Data Brief
December 2024
RISE PFI AS, Høgskoleringen 6B, 7491 Trondheim, Norway.
This data article summarizes the material properties of some added-lignin thermoformed pulps (ALTPs). This type of molded pulp is particularly suited for replacing plastics in environments, where moisture is encountered, as the lignin reduces the transport and adsorption of water. The dataset was measured on wet formed substrates with either softwood chemi-thermomechanical pulp (CTMP) or northern bleached softwood Kraft pulp (NBSK).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!