Anthraquinone-2-sulfonate enhances endogenous denitrification and phosphorus removal: Electron shuttle-mediated syntrophic partnerships.

Pseudocapacitive conductive materials drive selective shifts in direct versus mediated electron transfer pathways during sludge anaerobic digestion.

Interfacing nitrogen biochemistry with electrochemical output in Saccharomyces cerevisiae microbial fuel cells.

Low-dose nitrogen-doped carbon quantum dots boost medium-chain fatty acids production via enhanced proton-electron transfer.

Revealing the activation mechanism of periodate by groundwater treatment plant waste iron-containing sludge for sulfadiazine removal: the key activation role of transition metal Mn.

Treatment of waste activated sludge and the enhancement mechanism for electron transfer in an osmotic microbial fuel cell.

Synergistic effect of ternary nanoparticles ag@Zn-In2S3-(3-MPA): enhancement of catalyst electrocatalytic activity and luminophore electrochemiluminescence efficiency.

Electrochemical sensor based on MWCNTs/ZnONPs for detection of prostate specific antigen.

Biofilm-suspension syntrophy drives synergistic electro-fermentation through engineered spatial division of labor for concurrent carbon recovery and pollutant degradation.

Perennial tungsten release versus seasonal antimony source-sink transitions in macrophyte-dominated lake sediments: The interplay of Fe-Mn cycling and DOM molecular heterogeneity.

Conductive wire-activated iron-carbon potential: Self-driven bio-electrochemical system for efficient nitrogen and phosphorus removal from wastewater.

Biogenic FeS Reshapes microbial interactions to regulate acetogenesis in CO2-Fed microbial electrosynthesis.

Direct electron transfer (DET) between redox enzymes and electrodes is a crucial process in developing biosensors and cofactor-free bio electrosynthesis. However, due to unfavourable orientations, the absence of accessible redox centres, or long electron transfer distances, DET efficiency can be low. Here we present a systematic approach to better understand, evaluate and increase the DET capabilities of a formaldehyde dehydrogenase (F ald DH). F ald DH catalyses the reversible oxidation of formaldehyde to formate and is part of the CO 2 to methanol enzyme cascade. F ald DH from Burkholderia multivorans was fused to a DET capable domain, the soluble subunit of cytochrome b 562 from Escherichia coli. Fusion proteins with two different linker morphologies and various lengths were designed and biochemically and electrochemically characterised. The longest flexible linker had minor effects on biochemical constants and exhibited the highest increase in current density. We also identified an undesirable side-reaction between formaldehyde and basic amino acids to interfere with the electrochemical measurements and therefore normalised all currents to the percentage of basic amino acids on the solvent exposed surface area of the protein. This enabled us to present the first protein engineering approach to increase DET in this enzyme, resulting in a 1.6-fold increase in current density, compared to the wild-type enzyme. • Novel formaldehyde dehydrogenase fusion proteins were produced and characterised. • Fusion proteins are biochemically and electrochemically active. • Control experiments with non-enzymatic albumin also showed electroactivity. • The current density was normalised to the amount of basic amino acids. • This normalised data clearly indicates improvement in one fusion protein.

Polystyrene nanoplastics facilitate the Fe(II)-catalyzed ferrihydrite transformation into goethite and hematite under sedimentary conditions.

Biogeochemical cycling of sulfur and iron constrains arsenic enrichment in groundwater: Microbial functionality and organic matter composition.

Nutrients such as nitrogen (N) and phosphorus (P) reclamation from wastewater prior to discharge, specifically targeting concurrent nitrate and phosphate recovery, are vital for mitigating eutrophication and enabling resource circularity. In this study, three-dimensional spherical MgFe-layered double hydroxide functionalized with sludge-derived alginate-like exopolymers (MgFe-LDH-ALE) was elaborated for the recovery of nitrate and phosphate, with subsequent valorization of spent adsorbents as plant fertilizers. MgFe-LDH-ALE with a specific surface area of 44.54 m 2 ‧g -1 exhibited Langmuir maximum adsorption capacity of 17.51 and 34.15 mg‧g -1 for nitrate and phosphate at 25 o C, respectively. Adsorption kinetics followed a pseudo-second-order model, confirming chemisorption governed by combined intraparticle and film diffusion. Mechanism studies revealed synergistic pathways, including electrostatic attraction, interlayer anion exchange, surface complexation, and electron transfer. Post-adsorption MgFe-LDH-ALE-N/P composites, enriched with Fe/Mg/N/P, significantly enhanced lettuce growth, significantly accelerating the root length, plant height, stem diameter, leaf area, and chlorophyll a and chlorophyll b contents of lettuce. This sludge-to-resource strategy innovatively transforms waste into agricultural amendments while closing nutrient loops in wastewater treatment. • ALE was successfully componded with MgFe-LDH, realizing sludge recycling and pollutant removal. • N/P is removed by electrostatic attraction, interlayer anion exchange and surface complexation. • Post-adsorption MgFe-LDH-ALE-N/P significantly promote lettuce growth and chlorophyll production.

Biological reduction of Fenton sludge: Electron transfer mechanisms, regulatory strategies, and prospects.

Mn-doping-mediated electron transfer and active site modulation mechanism in Co2AlO4: Enabling efficient degradation and toxicity reduction of SDBS in industrial laundry wastewater

Unraveling the role of iodide in photosensitized oxidation of Met-Enkephalin.

Decoupled recovery of phosphorus and iron from sewage sludge via electrochemical anaerobic fermentation.