The tungsten trioxide (WO3) has a band gap energy of about 2.5 eV and has potential photocatalytic ability in visible light having a wavelength of less than 500 nm. Therefore, WO3 has potential application prospects in the treatment of organic dye contaminated water.

Tungsten carbide buttons tip were first applied to cone bits and then to DTH bits. The history of button bit in China starts from the cone bits in large diameter and DTH bits.

Different operating conditions are matched with different types of tungsten carbide rock drilling button in different shapes and sizes. When we design and select the tungsten carbide button, the load conditions of the rock drilling bits should be taken into considerations. The design of the parabolic button can be done with its reference taper angle.

Tungstate nanomaterials have been widely used in many fields, such as optics, electricity, magnetism, conductor/superconductor, catalysis, biology and so on. The synthesis methods of transition metal tungstate materials include sol-gel method, copolymer assisted synthesis, reversed micellar soft template, wet chemical method and solution synthesis.