Fe/Mn oxide decorated polyacrylonitrile hollow fiber membrane as heterogeneous Fenton reactor for methylene blue decolorization

Abstract

A very distinctive modification route was schemed to fabricate a membrane reactor that could heterogeneously catalyze Fenton reactions to decolorize dye wastewater in the process of filtration. Through this route, porogen-free polyacrylonitrile (PAN) hollow fiber membrane was decorated with in situ generated well-distributed Fe/Mn composite oxide, and the so-called membrane reactor was finally acquired. Its performance of decolorizing dye wastewater was evaluated by feeding methylene blue (MB) aqueous solution into its lumen side and analyzing the permeate gained from its shell side. The results showed that about 97.4% of MB could be removed from its aqueous solution as the solution passed through the shell side of hollow fiber membrane, and this removal efficiency would keep unchanged when operation period was lengthened. The membrane reactor presented excellent capability to decolorize MB aqueous solution and could be used repeatedly without any loss in decolorization efficiency. Finally, the mechanism of causing MB decolorization was proposed by comparing decolorization performance of modified and unmodified membranes, measuring total organic carbon, and analyzing UV-Vis spectra.

Visible Light Accelerates Cr(III) Release and Oxidation in Cr–Fe Chromite Residues: An Overlooked Risk of Cr(VI) Reoccurrence

“…However, as mentioned above, Cr in rCOPR often coexists with Fe species. It has been widely proven that Fe-containing agents could trigger the production of active oxygen species for the oxidation and degradation of pollutants in wastewater, both with and without light irradiation. , From this point of view, Fe-incorporated rCOPR, as the typical product of Fe-reduced chromium sludge, might be subject to light illumination to release highly toxic Cr­(VI).…”

Compact Carbon-Based Membrane Reactors for the Intensified Anaerobic Decolorization of Dye Effluents

“…For CSGOM and CSCM, because of having a nanoporous carbon layer on the top, decolorization gradually decreased to reach a stable 20% for R-CSGOM and 6% for R-CSCM. In this case, the pore size of the carbonaceous layers was able to partially reject the dyes, although both the adsorption site and pore size decreased with the stream time [50]. The highest decolorization, 99%, was observed for the bioreactor operated with CSGOM, while 97% of color removal was observed for B-CSCM.…”

Catalytic Reaction Intensification by a Novel Cryogenic Auxiliary Synthesized Fe-PAN Membrane

“…The results indicate that Fe-PAN exhibited high catalytic activity with excellent stability. As discussed in the SEM results, the porous structure of the Fe-PAN fiber could reduce both the external and internal diffusion resistance of reactants, 27,29 leading to a high contact efficiency and excellent catalytic activity. Meanwhile, the inside NZVI was protected and strongly complexed with PAN, making it not easy to deactivate and wash out.…”

“…The Fe leakage of C−Fe-PAN at the same time was 2.85 mg/L, which was similar to that of Fe-PAN. Unlike common Fe-incorporated catalysts, whose Fe leakages are severe under strong acidic conditions, 29 the Fe leakage in Fe-PAN can be nearly neglected (pH = 3). The results indicate that Fe-PAN exhibited high catalytic activity with excellent stability.…”