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Using macroporous ion exchange resin macrosphere D113 as an inexpensive organic carbon source, a composite precursor was constructed with Bi(OH)3 using a hydrothermal method. A series of new bismuth-based composite photocatalytic materials, Bi2O3/C, were prepared using pyrolysis technology and it was shown that the bismuth element existed in the form of Bi2O3 in the composite. It was uniformly distributed on the surface of a graphitized carbon macrosphere and exhibited a high electron transfer rate. The UV-vis diffuse reflectance spectrum and photoluminescence verified that Bi2O3/C exhibited a good light absorption performance and a low photogenerated electron hole recombination rate due to the optimized band structure. Electrochemical tests such as an i–t curve and electrochemical impedance spectroscopy showed that Bi2O3/C-500 had a good photoelectric response. In combination with the Tauc curve, the band structure of Bi2O3/C-500 was verified. Bi2O3/C-500 could degrade methylene blue (20 mg L−1) completely in 120 min, and the degradation rate remained at 90.30% for three photocatalytic cycles. The preparation method of the new Bi2O3/C was simple, inexpensive, and convenient for the commercial application of dye wastewater. [ABSTRACT FROM AUTHOR]

A series of novel resin-based MOF composites Co-MOF@D113-N (N = 1, 6) were prepared using 2-methylimidazole, cobalt acetate and D113 resin, through the layer-by-layer self-assembly method. The Co-MOF presented an amorphous form with the inducement of resin groups and the loading capacity increased with the number of self-assembled layers. The strong anchoring effect between Co and N effectively improved the thermal stability of the composites. The adsorption experiments showed that the adsorption capacity of the Co-MOF@D113-6 resin for Cu(II) increased with temperature in the range of 283–303 K. The adsorption capacity of Co-MOF@D113-6 for Cu(II) increased under the synergistic effect of MOFs and D113. The maximum adsorption capacity of Co-MOF@D113-6 was 273.88 mg g−1. The fitting results showed that the adsorption of Cu(II) by the Co-MOF@D113-6 conformed to the pseudo-second-order kinetic model dominated by chemisorption, and also conformed to the preferential Freundlich adsorption isotherm model. A low cost resin carrier combined with a high efficiency MOF composite adsorption material provided high efficiency and low consumption for promising development. [ABSTRACT FROM AUTHOR]