Preparation method and application of bamboo charcoal loaded au-tio2 composite material

Abstract

The invention relates to a preparation method of an Au-TiO2-bamboo charcoal composite material and its application, and aims to provide a solution to the problems of poor ability in removing ammonia nitrogen from a polluted water body at low temperature and unobvious effect in eliminating micro-pollution in present water treatment processes. The method first prepares Au-TiO2 nanometer powder by an isometric impregnation method, and then loads the Au-TiO2 nanometer powder on the bamboo charcoal. According to the invention, an Au-TiO2 nano-material with a large specific surface area and strong adsorption and oxidation performances is loaded into the pores of the bamboo charcoal, thus the bamboo charcoal simultaneously has the functions of ammonia nitrogen adsorption as well as photocatalytic oxidation of ammonia nitrogen. Therefore, the bamboo charcoal loaded Au-TiO2 composite material can remove ammonia nitrogen from low temperature water at efficiency of 60-90%, and heavy metals and persistent organic pollutants can be partly removed. Besides, the preparation method of the invention has a simple preparation process.

Description

technical field

[0001] The present invention relates to a kind of Au-TiO 2 -The preparation method and application of the composite material of bamboo charcoal. Background technique

[0002] In recent years, with the rapid development of the economy, most of the surface water and groundwater in my country have been polluted to varying degrees, and ammonia nitrogen is one of the main pollutants. If the polluted source water is not treated or treated properly, the ammonia nitrogen content in the effluent water from the waterworks will be high, which will cause the growth of nitrosifying bacteria and nitrifying bacteria in the pipe network, thus making the nitrate and nitrite in the pipe network content exceeded the standard. Excessive nitrates can cause methemoglobinemia in infants, and when nitrate nitrogen (NO 3 -N) When the content is higher than 10mg / L, the red blood cells cannot carry oxygen and cause the baby to suffocate and die; in addition, after the conversion of ...

Examples

specific Embodiment approach 1

[0017] Specific implementation mode 1: This implementation mode is bamboo charcoal loaded Au-TiO 2 The preparation method of composite material, it is realized through the following steps:

[0018] 1. Au-TiO 2 Preparation of nanomaterials: the TiO 2 The nano-powder is uniformly dispersed until the pH value is 8-9 and the concentration is 8-15g / L HAuCl 4 solution, then let it stand for 1-3 hours, then add ammonia water and soak for 1-3 hours, then filter, and then wash the precipitate on the filter paper until the filtrate is neutral to obtain Au-TiO 2 preform, and then Au-TiO 2 The preform is dried at 100°C-115°C for 12-16h, and then calcined at 400°C-600°C for 3-6h to obtain Au-TiO 2 Nanomaterials, among them, control TiO 2 Nanopowder quality and HAuCl 4 The ratio of solution volume is 1g: 8 ~ 15mL, the addition of ammonia water and HAuCl 4 The volume ratio of the solution is 1:1;

[0019] 2. Bamboo charcoal loaded Au-TiO 2 Preparation of composite materials: a, the ...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, TiO 2The nano powder is evenly dispersed to a concentration of 10g / L HAuCl with a pH value of 8-9 4 in solution. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that ammonia water is added in step 1 and soaked for 2 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

technical field

[0001] The present invention relates to a kind of Au-TiO 2 -The preparation method and application of the composite material of bamboo charcoal. Background technique

[0002] In recent years, with the rapid development of the economy, most of the surface water and groundwater in my country have been polluted to varying degrees, and ammonia nitrogen is one of the main pollutants. If the polluted source water is not treated or treated properly, the ammonia nitrogen content in the effluent water from the waterworks will be high, which will cause the growth of nitrosifying bacteria and nitrifying bacteria in the pipe network, thus making the nitrate and nitrite in the pipe network content exceeded the standard. Excessive nitrates can cause methemoglobinemia in infants, and when nitrate nitrogen (NO 3 -N) When the content is higher than 10mg / L, the red blood cells cannot carry oxygen and cause the baby to suffocate and die; in addition, after the conversion of ...

Examples

specific Embodiment approach 1

[0017] Specific implementation mode 1: This implementation mode is bamboo charcoal loaded Au-TiO 2 The preparation method of composite material, it is realized through the following steps:

[0018] 1. Au-TiO 2 Preparation of nanomaterials: the TiO 2 The nano-powder is uniformly dispersed until the pH value is 8-9 and the concentration is 8-15g / L HAuCl 4 solution, then let it stand for 1-3 hours, then add ammonia water and soak for 1-3 hours, then filter, and then wash the precipitate on the filter paper until the filtrate is neutral to obtain Au-TiO 2 preform, and then Au-TiO 2 The preform is dried at 100°C-115°C for 12-16h, and then calcined at 400°C-600°C for 3-6h to obtain Au-TiO 2 Nanomaterials, among them, control TiO 2 Nanopowder quality and HAuCl 4 The ratio of solution volume is 1g: 8 ~ 15mL, the addition of ammonia water and HAuCl 4 The volume ratio of the solution is 1:1;

[0019] 2. Bamboo charcoal loaded Au-TiO 2 Preparation of composite materials: a, the ...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, TiO 2The nano powder is evenly dispersed to a concentration of 10g / L HAuCl with a pH value of 8-9 4 in solution. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that ammonia water is added in step 1 and soaked for 2 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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