Radiation Preparation And Environmental Purification Of 3D Polymer-based Photocatalysts

With the rapid development of the modern science and modern industries,water treatment has become one of the most topical issues as the aquatic environment polluted by waste water.And photocatalytic degradation is one of the best ideal to solve the problem of water pollution.Traditional physical adsorption will only transfer pollutants from one phase to another phase;the pollutants are not degraded and easily lead to secondary pollution.However,photocatalysis is a simple and efficient way to develop water pollution owing to completely degradation of inorganic pollutant into CO₂ and H₂O.The sustainable use of solar energy determines its important position in the field of energy in comparison with traditional energy sources,and load of photocatalyst materials for the use of solar energy is essential.so far,photocatalytic technology has been widely used in photocatalytic hydrogen production,carbon dioxide reduction,nitrogen fixation,organic synthesis and photocatalytic degradation of organic matter.Heterogeneous titanium dioxide and other semiconductor photocatalyst is a popular photocatalyst,usually in the form of powder.It can be applied to wastewater either in the form of powder that is suspended form or can be supported over a suitable substrate.Although when used in the form of powder,Low light utilization efficiency of suspended photocatalyst.It has been reported that less than 1%of UV light actually penetrates at a depth of 0.5m under the water surface.Post-treatment recovery is both time and money consuming.This is because catalyst requires long settling time and efficient solid-liquid?phase?separation techniques.It also leads to loss of catalyst.Unfavorable human health problems are also associated with the mobility of the powder form.To overcome the above mentioned drawbacks,continuous efforts are being made to coat photocatalyst on various substrates.Immobilization of photocatalyst has the following advantages:relatively high quantum utilization efficiency as compared to powder when used for large scale practical applications.Ease of post-treatment recovery that would reduce the operational cost,and minimize the catalyst loss.However,the immobilized photocatalyst also has its own shortcomings,such as reduction in the surface area available for reaction,need of various suitable techniques involving well-defined procedures and equipments,unlike powder form of photocatalyst which is available in“ready to be used form”.To solve the above problems,three parts work in this paper done as following:?1?Portable nanocomposite photocatalytic resin?MGT?is prepared by radiation graft embedding method.The loss and agglomeration of the catalyst was effectively avoided owing to the photocatalyst?TiO₂?is effectively embedded in the surface of the resin carrier.In addition,it retains the inherent properties of the resin.Inspired by the ion exchange column,it can be removed continuously low concentrations of organic pollutants when used of self-made fluid bed photocatalytic system.?2?Photoactive conductive composite hydrogel-based photocatalyst?PAT?with 3D biomimetic structures were prepared by assembly method and enhanced stability by electron beam radiation method.The loss and agglomeration of the catalyst was effectively avoided owing to the TiO₂ nanoparticles are located onto the 3D matrix of the hydrogel.What's more,the hybrid hydrogels show high efficient pollutants removal ability by synergistic effect of excellent adsorption and photocatalytic degradation.?3?Reformable and separation-free hydrogel-based smart photocatalyst?NHC?is fabricated by radiation polymerization/crosslinking method.The loss and agglomeration of the catalyst was effectively avoided since the photocatalyst?g-C₃N₄?is uniformly embedded in the hydrogel skeleton in situ.Overall,it can be achieved separation-free by a simple hot switch when used of self-made portable photoreactor system.