Preparation of Manganese Lignosulfonate and Its Application as the Precursor of Nanostructured MnOx for Oxidative Electrocatalysis

Abstract

Abstract:The synthesis of manganese lignosulfonates by a two-step method has been reported. It was based on the conversion of technical sodium derivative of lignosulfonate to its hydrogen form i.e., lignosulfonic acid and its further reaction with manganese hydroxide. The obtained product was electroactive, and could be applied as the precursor of electroactive manganese oxide. The product showed a reversible redox activity in the potential range of 0 to 1 V vs. an Ag/AgCl reference electrode. The electroactivity of the obtained product can be tentatively assigned to the redox activity of both the electrodeposited MnO x and the presence of lignosulfonate-derived quinones since the energy dispersive spectroscopy (EDS) confirmed the presence of organic matter in the deposit. It also showed substantial electrocatalytic activity towards the anodic oxidation of hydrogen peroxide. This suggests that manganese lignosulfonates could be a valuable compound for the electrochemical preparation of electroactive layers that are suitable in the development of electrochemical sensors.

Lignin nanoparticles are renewable and functional platforms for the concanavalin a oriented immobilization of glucose oxidase–peroxidase in cascade bio-sensing

“…The electrochemical behavior of original LNPs (SI #5 †) was in accordance with data previously reported. 70,71 The experiments were performed in hydroquinone solution (H 2 Q) as electroactive mediator (1.0 Â 10 À4 M, PBS, 50 mM; pH 7.0), in the absence and presence of glucose (1.0 Â 10 À2 M) (the detailed procedure is reported in the experimental part). Cyclic voltammograms (CVs) have been recorded with a glassy carbon electrode (GC) reproducing Bio I, as shown in Fig.…”

Upgraded Valorization of Biowaste: Laser-Assisted Synthesis of Pd/Calcium Lignosulfonate Nanocomposite for Hydrogen Storage and Environmental Remediation

“…The ineptest characteristic of lignin would be impermeability, which possibly can be addressed by introducing various functional groups in lignin, 8 sulfonation being more adaptable for application in industrial products. 7,8 The enhancement of its water-soluble properties is the consequence of hydrophilic groups, such as sulfonate, phenolic hydroxyl, as well as alcoholic hydroxyl. 9 In the presence of sulfonic groups, carbon chain, hydrophobic groups, along with hydrophilic groups, lignosufonate (LS) shows good surface activity and acts as a catalyst.…”

“…10 According to the production process deployed, diverse ion-based LS can be obtained as calcium, sodium, or magnesium lignosulfonates. 8 LS, a three-dimensional network structured polyphenolic compound, can be simply oxidized electrochemically 7 and makes an ideal substrate to decorate with nanoparticles thus modifying and fine-tuning its properties for high-end applications, 6 namely, for energy storage and in catalysis. 7,11 Synthesis of nanocomposite-based materials for the hydrogen storage study has been one of the active research fields; nanocomposites encompassing nickel, palladium, platinum, and some metal oxide have the ability for hydrogen adsorption and desorption.…”

“…8 LS, a three-dimensional network structured polyphenolic compound, can be simply oxidized electrochemically 7 and makes an ideal substrate to decorate with nanoparticles thus modifying and fine-tuning its properties for high-end applications, 6 namely, for energy storage and in catalysis. 7,11 Synthesis of nanocomposite-based materials for the hydrogen storage study has been one of the active research fields; nanocomposites encompassing nickel, palladium, platinum, and some metal oxide have the ability for hydrogen adsorption and desorption. 12 Among these metals, Pd shows a unique ability for adsorption of hydrogen atom because of its structure, 13,14 turn them into effective catalysts for adsorption/desorption of hydrogen atoms 15 and also reduction/degradation of environmental pollutants; 16−21 such activity for hydrogen storage has been studied in nanocomposites, including Si wafer 12 and single-and multiwalled carbon nanotubes.…”

“…Aiming for this sustainable target, the design and synthesis of novel materials in a greener fashion from renewable and abundant resources has been the main objective. − Among the bio-based materials, after cellulose, lignin is the most widely known naturally occurring biopolymer comprising of cross-linked amorphous copolymer bonded together by means of different C–O–C and C–C linkages. The ineptest characteristic of lignin would be impermeability, which possibly can be addressed by introducing various functional groups in lignin, sulfonation being more adaptable for application in industrial products. , The enhancement of its water-soluble properties is the consequence of hydrophilic groups, such as sulfonate, phenolic hydroxyl, as well as alcoholic hydroxyl .…”