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Floating type super-hydrophilic CdS/RGO composite aerogel, preparation method and application thereof

A composite aerogel, super-hydrophilic technology, applied in aerogel preparation, catalyst activation/preparation, water/sewage treatment, etc., can solve the problems of difficult separation and recovery of powder catalysts, easy particle agglomeration, poor stability, etc. Achieve high practical value and application prospects, large specific surface area, and strong renewable ability.

Pending Publication Date: 2020-11-20
福建生物工程职业技术学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide a novel floating super-hydrophilic CdS / RGO composite airgel and its preparation method and application, adopting a one-step in-situ synthesis hydrothermal method, which will solve the traditional Photocatalyst CdS particles are easy to agglomerate, have poor stability, are prone to photocorrosion, and powder catalysts are not easy to separate and recycle, etc.

Method used

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  • Floating type super-hydrophilic CdS/RGO composite aerogel, preparation method and application thereof
  • Floating type super-hydrophilic CdS/RGO composite aerogel, preparation method and application thereof
  • Floating type super-hydrophilic CdS/RGO composite aerogel, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0025] Preparation of Floating Superhydrophilic CdS / RGO Composite Airgel with Efficient Adsorption and Photocatalytic Degradation Capabilities

[0026] Add cadmium acetate and thiourea to 4g / L L-lysine solution, stir vigorously at room temperature for 30min to form a clear and transparent solution, then add GO oxide to adjust the pH of the system to 3, 7, 12, at 160 CdS / RGO composite (such as figure 1shown). Use hydrochloric acid and sodium hydroxide to adjust the pH value of the system. After the reaction of the synthetic system with pH = 3 and 7, the sample is black and yellow solid, no hydrogel is formed, and there is a yellow solid floating in the system, indicating that CdS and RGO are not effective. Composite; in the synthetic system of pH=12, adjust the filling amount of CdS, can obtain such as figure 2 The series of hydrogels shown (in the figure, R G:C:L Indicates GO(G):CdAc during synthesis 2 (C): the usage ratio of lysine (L). The floating superhydrophilic CdS...

Embodiment 2

[0031] Formation Process of Floating Superhydrophilic CdS / RGO Composite Airgel with Efficient Adsorption and Photocatalytic Degradation Capabilities

[0032] Our previous work showed (published literature: Chem.Commun.,2014,50,10311-10314), due to the electrostatic attraction and hydrogen bonding between L-lysine and GO and the π-π stacking between GO, The hydrothermal treatment of the mixed solution of L-lysine and GO can make the GO nanosheets cross-link and gel each other to form a 3D lys-RGO hydrogel. On this basis, we proposed the formation process of CdS / RGO composite airgel ( Figure 6 ). L-lysine is a basic amino acid, and the pH value of the mixed solution formed with GO is about 10.8. At this pH, L-lysine exists mainly as a zwitterion with a deprotonated carboxyl group and a protonated amino group. The protonated amino group on L-lysine is adsorbed on the surface of GO by electrostatic attraction, while the deprotonated carboxyl group is exposed. Adding cadmium a...

Embodiment example 3

[0034] Comparison of floating superhydrophilic CdS / RGO composite airgel and CdS powder in liquid phase photocatalytic degradation of tetracycline hydrochloride (TC)

[0035] TC wastewater belongs to medical wastewater containing refractory organic matter and biotoxic substances. It is difficult to biochemically, has high solubility in water, and is difficult to separate. Conventional water treatment technology has little effect on antibiotic wastewater treatment, and it can only be decomposed during the degradation process. It is difficult to completely mineralize it. CdS / RGO composite airgel of the present invention is superhydrophilic type ( Figure 7 a Inset), which can be used for adsorption and photocatalytic degradation of hydrophilic TC under visible light. The process of photocatalytic degradation of TC can be represented by the spectrogram of TC concentration changing with time, that is, the change of absorbance of the main peak of TC at 356 nm with time is monitored...

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Abstract

The invention provides a floating type super-hydrophilic composite aerogel photocatalyst for degrading tetracycline hydrochloride, and belongs to the technical field of photocatalytic material preparation and environment purification. According to the preparation method, L-lysine is used as a reducing agent and a cross-linking agent to effectively compound CdS nanosheets and reduced graphene oxide(RGO) to obtain a floating type super-hydrophilic CdS / RGO composite aerogel, so that compounding of electrons and holes can be effectively slowed down while the photocatalyst can automatically floaton the water surface without stirring or under the condition of natural light in a hydrophilic pollutant system, the utilization rate of visible light in a photocatalytic reaction is improved to the greatest extent, and the photocatalytic efficiency is improved; the floating aerogel has a macrostructure with a diameter of 20 mm and a height of 30 mm, is convenient for large-area throwing and easyto recover, and can be removed from a photocatalytic reaction system by clamping the aerogel with tweezers; and the preparation method is simple, raw materials are cheap and easy to obtain, large-scale industrial production is facilitated, and remarkable economic and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation and environmental purification, and in particular relates to a floating superhydrophilic CdS / RGO composite airgel photocatalytic material and a preparation method thereof which can efficiently absorb and photocatalytically degrade hydrophilic antibiotic pollutants. Background technique [0002] CdS is a traditional semiconductor material with narrow bandgap energy (about 2.4eV). It has visible light response and can exert an efficient photocatalytic degradation effect on refractory organic pollutants in water. However, CdS is easy to agglomerate, has poor stability, and is prone to photocorrosion (CdS+2h + →Cd 2+ +S) and other problems reduce its photocatalytic performance. Reducing the recombination of electrons and holes is one of the key factors determining quantum efficiency. At the same time, photocatalytic degradation occurs on the surface of semiconductors, and...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J35/10B01J37/10B01J13/00B01J20/20B01J20/28B01J20/30C02F1/28C02F1/30C02F1/72C02F101/34C02F101/38
CPCB01J27/04B01J37/10B01J13/0091B01J20/20B01J20/28047B01J20/28011C02F1/725C02F1/30C02F1/281C02F1/283C02F2101/38C02F2101/34C02F2305/10B01J35/23B01J35/61B01J35/39
Inventor 刘文君何文胜王倩雯
Owner 福建生物工程职业技术学院