New Electrocatalyst Enables Simultaneous Wastewater Treatment and Sustainable Chemical Production

Researchers at Tohoku University have developed a novel electrochemical system that simultaneously converts biomass-derived materials and nitrate pollutants into high-value industrial chemicals. By utilizing a specialized nickel-vanadium catalyst, the process transforms 1,5-pentanediol into glutaric acid and nitrate contaminants into ammonia. This dual-reaction approach significantly reduces energy consumption compared to traditional electrolysis, offering a more sustainable pathway for the production of polymers and fertilizers.

Tohoku University researchers, led by Distinguished Professor Hao Li of the Advanced Institute for Materials Research (WPI-AIMR), have introduced a nickel-vanadium layered double hydroxide (NiV-LDH) catalyst designed to optimize industrial chemical synthesis. The catalyst features engineered nickel-oxygen-vanadium bridges that alter electronic properties to accelerate two distinct chemical reactions within a single electrolysis cell. This system replaces the standard, energy-intensive oxygen evolution reaction at the anode with the oxidation of 1,5-pentanediol, a biomass-derived compound, into glutaric acid, which is essential for manufacturing polymers and specialty materials.

The performance of the NiV-LDH catalyst reached high levels of efficiency, according to findings published in the journal Angewandte Chemie. The system converted 1,5-pentanediol into glutaric acid with a Faradaic efficiency of 98.5%, while nitrate pollutants were converted into ammonia at a 96.1% Faradaic efficiency. These figures represent a significant improvement over previously reported catalysts, as the atomic-scale structures within the catalyst optimize how reaction molecules interact with the surface, ensuring that nearly all electrical energy contributes to the production of desired chemicals.

To demonstrate industrial viability, the research team operated the electrolysis device for 240 continuous hours using solar power. During this period, the system produced nearly 56 grams of glutaric acid and over 23 grams of ammonium chloride, showcasing long-term stability that exceeds many comparable technologies. Professor Li noted that the goal is to address environmental challenges and chemical production needs simultaneously by transforming waste streams into valuable products. Future efforts will focus on scaling the technology for real-world industrial wastewater applications and refining product-separation methods to maximize economic and environmental benefits.