Magnetic mesoporous carbon/nano TiO2 compound adsorbent and preparation method thereof

Abstract

The invention belongs to the technical field of nanometer materials and preparation thereof and particularly relates to a magnetic mesoporous carbon / nano TiO2 compound adsorbent and a preparation method thereof. The compound adsorbent contains 50 to 80 percent of nano TiO2, 10 to 20 percent of magnetic metal nanoparticles and 10 to 30 percent of mesoporous carbon, wherein the mesoporous carbon is taken as a carbonaceous substrate; the nano TiO2 is distributed on the carbonaceous substrate; the magnetic metal nanoparticles are embedded in mesopores of the carbonaceous substrate. The preparation method of the magnetic mesoporous carbon / nano TiO2 compound adsorbent comprises the following steps of dispersing TiO2 nanoparticles in resin; adding transition metal hydroxide colloidal particles as a template agent; performing resin impregnation, heating curing, high temperature carbonization, washing and purifying and the like to obtain the magnetic mesoporous carbon / nano TiO2 compound adsorbent. According to the magnetic mesoporous carbon / nano TiO2 compound adsorbent disclosed by the invention, organic pollutants can be quickly and efficiently absorbed to be nearby the surface of the nano TiO2, and organic matters are decomposed into small-molecule gases or soluble substances, so that the biological toxicity and the environment pollution of the organic matters are reduced; the adsorbent can be separated and recovered by magnetic particles, so that secondary pollution to a water body is avoided, and the recycling of the adsorbent is facilitated.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and their preparation, in particular to a magnetized mesoporous carbon / nano-TiO 2 Composite adsorbent and its preparation method. Background technique [0002] Nano titanium dioxide (TiO 2 ) has a forbidden band width of 3.2eV, so under the condition of ultraviolet light irradiation (wavelength ≤ 387nm), the electrons in the valence band can be excited to transition to the conduction band, leaving photoinduced holes with electron capture ability, while the electrons in the conduction band Excited state electrons also have high activity, thus forming a strong oxidation-reduction effect on the surface of the semiconductor, forming a certain oxidation-decomposition effect on surrounding substances, especially organic substances; TiO 2 The smaller the particle size, the higher the oxidation-reduction potential on the surface, and the blue-shift of the absorption range of ultraviolet light ...

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Problems solved by technology

[0004] Nano TiO 2 In the wastewater treatment experiment, there are also some long-standing technical problems, which can be summarized as the following two main aspects: one is nano-TiO 2 The effective range of photocatalytic oxidation is small, mainly concentrated near the particle surface, resulting in the degradation rate of organic pollutants will be significantly affected by the diffusion speed of organic pollutant molecules in the solution, making nano-TiO 2 The photocatalytic degradation ability cannot be fully exerted; the second is that nano-TiO 2 The particles are small, the separation and recovery from the solution are difficult, and there will be a large amount of loss in the open water body, which is not conducive to the process control of the wastewater treatment process

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