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Waste toner powder is considered not only a recyclable resource but also a hazardous material, because it has a unique microstructure and complex compositions, so it should be properly and effectively disposed of. Herein, we selected waste toner powder as a precursor to synthesize a three-dimensional (3D) porous graphene oxide (GO) hydrogel by a one-pot transformation based on the improved Hummers' method. A series of detection equipment such as a scanning electron microscope and a Raman spectrometer can be employed to probe the microstructure and formation mechanism of the 3D GO hydrogel. Our experimental results show that a 3D porous GO hydrogel with its excellent microstructure can be prepared by using waste toner powder as the precursor. It provides an effective way to dispose of waste toner powder for functional applications.

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By using different solvent molecules as structure agent, two novel selenidostannates were solvothermally synthesized. In compound K2HgSnSe4(1), tetrahedra Hg/SnSe4 are edge-sharing to form one-dimensional (1-D) anion chains [HgSnSe4]2-, and these...

Activated carbons derived from biomass have been proved to be one of the most promising adsorbents due to their abundance, low cost, reproducibility and environmental friendliness. In this study, a simple, facile and effective pyrolysis method was demonstrated to prepare hierarchical porous biomass charcoal by using peanut shells as precursor without chemical activation in an electric muffle furnace. The obtained products hold porous structure and abundant oxygen-containing functional groups, which were mainly due to in-built template of the structure of peanut shell and the preparation process without nitrogen protection, respectively. Interestingly, the obtained biomass charcoal sample with excellent adsorptive property quickly removed Pb2+ (100 mg/L) and methylene blue (50 mg/L) from water with removal efficiency of 96.5% and 97.1%, and removal capacity of 48 mg/g and 24 mg/g, respectively. The synthetic process was simple and economical, and it could be used as a beneficial reference in the recycling of biomass waste.

In the present study, synthesis and characterisation of titanium dioxide (TiO2) nanoparticles concurrently doped with fluorine (F) and manganese (Mn) are studied for the improved photocatalytic degradation and bacterial inhibition. The absorption spectrum observed at 400 nm is blue shifted to 398 nm in co-doped TiO2, which confirmed the increase in incorporation of F and Mn. Transmission electron microscopic images and XRD results confirm that the size of the TiO2 nanoparticles decreased with increasing concentration of co-dopants. Co-doping of TiO2 with F and Mn is confirmed by FTIR, XRD, EDAX and XPS studies. The TiO2 nanoparticles prepared at higher concentration of dopants show the existence of nanorods. It is obvious that the doping of TiO2 with Mn and F can degrade textile wastewater and methylene blue with 120 min of visible light irradiation. The antimicrobial activities of the prepared samples increased with increasing doping level of F and Mn against Staphylococus aureaus and Escherichia coli.