In recent years, lead-containing materials are being gradually eliminated due to their high pollution, high toxicity, low strength and low efficiency. It is hoped that high-energy polymer composites with good processability will be developed to expand the application of metal materials.

Bismuth tungstate nanometer is a kind of photocatalytic material with high efficiency, low toxicity and good stability. It is a typical Olivis oxide with perovskite-like WO₆ layer structure and narrow band gap (only about 2.80 eV). It can effectively remove organic pollutants in water by visible light photocatalysis. In the treatment of water pollution, Bi₂WO₆ nanometer is a typical perovskite-like oxide. It has important application value.

As a traditional material, nickel-tungsten alloy has attracted much attention because of its many superior properties and some potential applications. Tungsten-nickel alloy electroplating has compact structure, high heat resistance, comparable to ceramics, wear resistance and oxidation resistance at high temperature, and good self-lubrication and corrosion resistance.

Bismuth tungstate is the simplest orivis oxide with narrow band gap (about 2.7eV) and can absorb part of visible light. This material has been used for photocatalytic degradation of organic pollutants, photocatalytic organic reaction and photocatalytic decomposition of water.