Unveiling a recycling-sourced composite to help meet Sustainable Development Goals in the circular economy
Unveiling a Recycling-Sourced Mineral-Biocellulose Fibre Composite for Use in Combustion-Generated NOx Mitigation Forming Plant Nutrient: Meeting Sustainability Development Goals in the Circular Economy
NOx (nitrogen oxides) are emitted during combustion in air at high temperatures and/or pressure; if they exceed recommended levels, this has a negative impact on the population. The authors found that when moist, limestone (CaCO3) readily sorbs NO2 to form calcium nitrate, which provides the basis for developing a surface flow filter. The substrate was made from “over-recycled” cellulose fibres such as newsprint, magazines and packaging fibres which are too weak for further recycling. The substrate was coated with fine-ground calcium carbonate and micro-nano-fibrillated cellulose, which was used as a binder and essential humectant to prevent a stagnant air layer forming. Pre-oxidation countered the action of denitrification bacteria colonising the cellulose substrate.