Molecularly imprinted photocatalytic material as well as preparation method and application thereof

Abstract

The invention discloses a molecularly imprinted photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The molecularly imprinted photocatalytic material is composed of titanium dioxide, iron oxide and carbon nitride. According to the invention, molecularly imprinted titanium dioxide is compounded with iron oxide and carbon nitride, so that the forbidden bandwidth of titanium dioxide is reduced, and the prepared molecularly imprinted catalytic material can generate photo-induced electrons and holes under natural light; and meanwhile, the prepared molecularly imprinted catalytic material is a ternary material, the separation degree of the photo-induced electrons and holes of the photocatalytic material is improved and the photocatalytic efficiency is improved by utilizing the exciton effect of the ternary material, so that the performance of photocatalytic degradation of pollutants is improved, and the molecularly imprinted catalytic material has a good application prospect in the fields of complex water body purification and the like.

Description

technical field

[0001] The invention relates to the technical field of photocatalytic materials, in particular to a molecularly imprinted photocatalytic material and its preparation method and application. Background technique

[0002] With the rapid development of the economy and the emphasis on human health, pharmaceuticals and personal care products (PPCPs) are widely used. These compounds cannot be completely absorbed by animals and humans, and are often excreted with feces and urine, resulting in the presence of excess in water. Micropollutants such as antibiotics, tranquilizers, steroids, and endocrine disruptors. Among them, the abuse of antibiotics is a serious problem. Antibiotics will produce drug-resistant bacteria, threatening the health of the ecosystem and human body. How to efficiently remove antibiotics in water is a scientific hotspot in recent years. At present, the methods for removing antibiotics in water mainly include biological methods, chemical oxida...

Examples

Embodiment 1

[0042] Step 1, dissolve 10ml of n-butyl titanate, 1.438g of sulfamethoxazole (SMZ) and 10ml of glacial acetic acid in 60ml of absolute ethanol, stir evenly to obtain TiO 2 Sol;

[0043] Step 2, 0.1588gFeCl 3 ·6H 2 O was dissolved in 10ml of absolute ethanol to obtain solution A, and then solution A was gradually added to 50ml of distilled water, and vigorously stirred in a water bath at 90°C for 3 hours to form a uniform and transparent Fe 2 o 3 Sol;

[0044] Step 3, the TiO that step 1 makes 2 Sol and the Fe produced in step 2 2 o 3 The sol is mixed evenly to obtain TiO 2 / Fe 2 o 3 Composite sol, aged for 48h to form xerogel, the xerogel was ground into powder and calcined in a muffle furnace at 500°C for 4h to obtain TiO 2 / Fe 2 o 3 Complex;

[0045] Step 4: Put melamine in the crucible and cover the crucible, bake at 550°C for 3 hours, and cool to room temperature to obtain blocky yellow solid g-C 3 N 4 , the yellow solid g-C 3 N 4 Grind into powder, and 10...

Embodiment 2

[0057] The difference from Example 1 is that the imprinted molecule is BPA.

[0058] Results: When the catalyst material dosage was 100mg, the pollutant concentration was 10mg / L, and the volume was 100ml, the molecularly imprinted photocatalytic material prepared in this example had an adsorption rate of 12.8% for BPA and a 70min degradation rate for BPA of 99%.

Embodiment 3

[0060] The difference from Example 1 is that the imprinted molecule is SDZ, and in step 2 FeCl 3 ·6H 2 The amount of O added is 0.158g, and the temperature of calcination in step 3 is 600°C and the time is 2h.

[0061] Results: The molar ratio of titanium dioxide molecules to iron oxide in the molecularly imprinted photocatalytic material prepared in this example was 100:1.

[0062] When the amount of catalyst material is 100 mg, the pollutant concentration is 10 mg / L, and the volume is 100 ml, the adsorption rate of the molecularly imprinted photocatalytic material prepared in this example to SDZ is 13.4%, and the degradation rate to SDZ 120min is 99%.

technical field

[0001] The invention relates to the technical field of photocatalytic materials, in particular to a molecularly imprinted photocatalytic material and its preparation method and application. Background technique

[0002] With the rapid development of the economy and the emphasis on human health, pharmaceuticals and personal care products (PPCPs) are widely used. These compounds cannot be completely absorbed by animals and humans, and are often excreted with feces and urine, resulting in the presence of excess in water. Micropollutants such as antibiotics, tranquilizers, steroids, and endocrine disruptors. Among them, the abuse of antibiotics is a serious problem. Antibiotics will produce drug-resistant bacteria, threatening the health of the ecosystem and human body. How to efficiently remove antibiotics in water is a scientific hotspot in recent years. At present, the methods for removing antibiotics in water mainly include biological methods, chemical oxida...

Examples

Embodiment 1

[0042] Step 1, dissolve 10ml of n-butyl titanate, 1.438g of sulfamethoxazole (SMZ) and 10ml of glacial acetic acid in 60ml of absolute ethanol, stir evenly to obtain TiO 2 Sol;

[0043] Step 2, 0.1588gFeCl 3 ·6H 2 O was dissolved in 10ml of absolute ethanol to obtain solution A, and then solution A was gradually added to 50ml of distilled water, and vigorously stirred in a water bath at 90°C for 3 hours to form a uniform and transparent Fe 2 o 3 Sol;

[0044] Step 3, the TiO that step 1 makes 2 Sol and the Fe produced in step 2 2 o 3 The sol is mixed evenly to obtain TiO 2 / Fe 2 o 3 Composite sol, aged for 48h to form xerogel, the xerogel was ground into powder and calcined in a muffle furnace at 500°C for 4h to obtain TiO 2 / Fe 2 o 3 Complex;

[0045] Step 4: Put melamine in the crucible and cover the crucible, bake at 550°C for 3 hours, and cool to room temperature to obtain blocky yellow solid g-C 3 N 4 , the yellow solid g-C 3 N 4 Grind into powder, and 10...

Embodiment 2

[0057] The difference from Example 1 is that the imprinted molecule is BPA.

[0058] Results: When the catalyst material dosage was 100mg, the pollutant concentration was 10mg / L, and the volume was 100ml, the molecularly imprinted photocatalytic material prepared in this example had an adsorption rate of 12.8% for BPA and a 70min degradation rate for BPA of 99%.

Embodiment 3

[0060] The difference from Example 1 is that the imprinted molecule is SDZ, and in step 2 FeCl 3 ·6H 2 The amount of O added is 0.158g, and the temperature of calcination in step 3 is 600°C and the time is 2h.

[0061] Results: The molar ratio of titanium dioxide molecules to iron oxide in the molecularly imprinted photocatalytic material prepared in this example was 100:1.

[0062] When the amount of catalyst material is 100 mg, the pollutant concentration is 10 mg / L, and the volume is 100 ml, the adsorption rate of the molecularly imprinted photocatalytic material prepared in this example to SDZ is 13.4%, and the degradation rate to SDZ 120min is 99%.

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