Polyaniline (PANI) modified carbon-containing SnO2 composites (SnO2/Carbon/PANI) have been successfully synthesized via a simple liquid phase synthesis method. The compositions, structures, and properties of as-synthesized samples were characterized by X-ray diffraction, Fourier transform infrared spectorscopy, Brunauer-Emmett-Teller measurements, scanning electron microscopy, and tunneling electron microscopy. Meanwhile, the degradation mechanism of the photocatalysts was put forward. The photocatalytic tests showed that the SnO2/Carbon/PANI composites have excellent photocatalytic activity for methyl orange (MO) degradation under visible light irradiation and the MO can be degraded to 98% within 10 minutes. The photocatalytic activity is still excellent after three cycles and as-synthesized samples have emerged as powerful foundation for further industrial application.

The absorbent resin for Cu2+ removal was prepared under microwave irradiation through grafting acrylamide (AM) and acrylic acid (AA) to cellulose. The initiator is a kind of redox system composed of potassium persulfate/sodium thiosulfate. The crosslinking agent is N,N′-methylene bisacrylamide. The optimal reaction conditions are as follows: the ratio of AA to cellulose is 10 : 1, initiator to AA is 0.65 wt%, crosslinking agent to AA is 1.0 wt%, neutralization degree of AA is 75%, microwave power level is 320 W, and time is 300 s. The maximum absorption capability of the resin is 65 mg·g−1. Different from previous studies, the reaction was carried out without the protection of nitrogen and troublesome posttreatment. The product was obtained directly by one-step synthesis without purification and drying of the crude product. The pollution and cost caused by organic solvent are avoided, and the whole preparation period is shortened deeply. Moreover, the time of absorption equilibrium is shorter. In a word, the preparation in this paper has the obvious advantages, such as simple process, short time, no pollution, low-energy, and low-cost.