Antifouling wood matrix with natural water transfer and micro reaction channels for water treatment
G Liu, D Xu, S Chang, J Hu, Xianjun Li5, Y Liu
Wood with abundant nutrition transport channels could be considered as a kind of natural water purifier due to quick and effective passages for separation. Nevertheless, microporosity as main porous structure of initial wood are not enough to effectively separate small molecular, such as organic dye pollutants. Meanwhile, like most filters the fouling resulting in blocking and poor water flux will also restrict their large scale. Here, we incorporate Fenton-like catalysis based on Mn3O4 loading for degradation of methyleneblue with water transfer and separation channel of fir wood (the interfacial area was estimated up to 6×104 m2/m3) to solve the low separating efficiency and fouling problem. The results show that wood matrix treated by hydrothermal carbonization loading with Mn3O4 nanoparticles (Mn3O4/TiO2/wood) exhibited remarkable catalytic efficiency on methylene blue (MB) moles degradation and the fouling problem could be significantly alleviated during Fenton-like catalysis. The turnover frequency of the wood matrix is 6.072×10-3 molMB·molMn3O4−1·min−1 which is much higher than the values reported in the literature. The flux maintained approached 2045 L·m-2·h-1 with a high rejection rate of more than 95%. Wood with natural interconnected micropores as main fluid transfer and micro reaction channels is a promising material for construction parallel-series microreactors, applying to some vital chemical process besides sewage purification and desalination.
Keywords: wood matrix, water purifier, fouling, Mn3O4 nanoparticles, Fenton-like, microreactor