Application of an organic photothermal eutectic material in clean water and power cogeneration

Abstract

The present invention provides an application of an organic photothermal eutectic material in clean water and power cogeneration, wherein the polycyclic aromatic hydrocarbons are naphthalene, anthracene, phenanthrene or pyrene, or naphthalene, anthracene, phenanthrene or pyrene with CH3, CH2CH3, OH or NH2 substituents. The organic photothermal material has a simple and efficient preparation method and is environmentally friendly; it has high stability, good performance, and excellent photothermal-electrical conversion performance.

Description

Technical Field

[0001] The present invention relates to the technical field of photothermal catalytic degradation, and in particular to the application of an organic photothermal eutectic material in the cogeneration of clean water and electricity. Background Art

[0002] In recent years, the shortage of water resources and clean energy has become a global problem that needs to be solved urgently, which has seriously affected people's lives. Clean seawater production technology, as a freshwater resource increment technology, has received widespread attention. Although many technologies have been adopted for seawater desalination, cost is still a big problem. Direct evaporation of seawater by solar energy is an attractive and promising method. At present, the emergence of organic photothermal eutectic materials has made it possible to achieve seawater desalination and water and power cogeneration due to its simple synthesis and excellent light absorption ability, and is becoming an important material for utilizing solar energy. However, most photothermal materials still have many problems, such as complex synthesis, high price, poor absorption performance, low photothermal conversion efficiency and unclear mechanism, and thermal management. Therefore, the development of simple and high-performance photothermal materials is urgent.

[0003] In general, high-performance photothermal materials for interfacial water evaporation contain the following three important features:

[0004] (1) Wide spectrum absorption capability of photothermal materials;

[0005] (2) High photothermal conversion efficiency;

[0006] (3) Stability during application.

[0007] When photothermal materials are excited by visible light or near-infrared light, they will eventually return to their original equilibrium state. In this process, part of the absorbed photon energy is released as heat through non-radiative transitions. Good photothermal materials should have high photothermal conversion efficiency, suitable absorption spectrum, and high light absorption capacity. So far, various photothermal materials can be roughly divided into two categories: inorganic photothermal materials and organic photothermal materials. Traditional inorganic photothermal materials are difficult to synthesize and expensive, while organic photothermal materials have the characteristics of low toxicity, easy structural modification, adjustable properties, and rich molecular weight. Therefore, organic photothermal materials have developed rapidly in the past decade.

[0008] In recent years, eutectic materials have gradually entered people's field of vision due to their simple preparation, controllable design and unique application. Organic photothermal eutectic materials can freely regulate the light capture ability of the material to achieve excellent absorption capacity, and at the same time have high photothermal conversion efficiency, which provides an excellent material basis for the application of solar thermal conversion to drive interfacial water evaporation. Summary of the invention

[0009] The purpose of the present invention is to provide an organic photothermal eutectic material for use in clean water and power cogeneration in view of the defects of photothermal materials in the prior art.

[0010] The technical solution adopted to achieve the purpose of the present invention is:

[0011] An application of an organic photothermal eutectic material in clean water and power cogeneration, wherein the organic photothermal eutectic material is formed by self-assembly of a donor and an acceptor through a simple solution volatilization method, wherein the donor is a polycyclic aromatic hydrocarbon, and the acceptor is TCNQ, FTCNQ, F2TCNQ, or F4TCNQ.

[0012] In the above technical solution, the polycyclic aromatic hydrocarbons are naphthalene, anthracene, phenanthrene or pyrene, or naphthalene, anthracene, phenanthrene or pyrene with CH3, CH2CH3, OH or NH2 substituents.

[0013] In the above technical solution, the structural formula of the donor is:

[0014]

[0015] Wherein, R is CH3, CH2CH3, OH or NH2.

[0016] In the above technical solution, the method for preparing the organic photothermal eutectic material comprises the following steps:

[0017] The donor molecules and the acceptor molecules are uniformly dispersed in a solvent, ultrasonically dispersed, and volatilized in an environment of -10°C to 200°C for 0-150 hours (excluding 0 hour) to obtain the organic photothermal eutectic material.

[0018] In the above technical solution, the stoichiometric ratio of the donor molecule to the acceptor molecule is (0.5-1): (0.5-1).

[0019] In the above technical solution, the solvent is dichloromethane, acetonitrile, tetrahydrofuran or chloroform.

[0020] In the above technical solution, the absorption wavelength of the organic photothermal eutectic material is 220-2400nm.

[0021] In the above technical solution, when the organic photothermal eutectic material is applied to photothermal conversion, its temperature rises to 90-100°C in 30s.

[0022] In the above technical solution, when the organic photothermal eutectic material is applied to photoelectric conversion, the power supply output voltage can be 160mV.

[0023] In the above technical solution, when the organic photothermal eutectic material is used for seawater evaporation, the rate can be as high as 1.6 kg / m 2h -1 .

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The organic photothermal material that can be used for solar thermal conversion provided by the present invention has a simple, efficient and environmentally friendly preparation method, high stability and good performance.

[0026] 2. There are three kinds of interaction forces between molecules of the organic photothermal eutectic material provided by the present invention, and the excellent light absorption ability is beneficial to the light capture ability of the water evaporation device. The absorption wavelength covers 220-2400nm, and the solar light absorption rate reaches 86%. The organic photothermal eutectic material has excellent photothermal effect, which makes the evaporation device heat up quickly.

[0027] 3. The organic photothermal eutectic material provided by the present invention is applied to interfacial water evaporation, which can avoid the shortcomings of flash evaporation and other methods such as high energy consumption and high cost. On the one hand, the strong interaction between the charge transfer eutectic molecules narrows its band gap, and the narrow band gap promotes non-radiative transitions so that light energy decays rapidly into heat energy. On the other hand, the excellent photothermal capacity can promote the water evaporation device to quickly absorb sunlight to achieve heat conversion, and then evaporate water from the interface.

[0028] Organic photothermal eutectics for solar thermal conversion with wide spectrum absorption have strong charge transfer interactions, which increase the light absorption capacity to a certain extent. The wide range of sunlight absorption capacity is conducive to solar thermal conversion, further promotes the interfacial water evaporation effect, and shows excellent water evaporation advantages, showing great potential application value in fields such as seawater desalination. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A diagram showing a method for synthesizing an organic photothermal eutectic material obtained in Example 1;

[0030] Figure 2 The optical microscope morphology of the organic photothermal eutectic material obtained in Example 1;

[0031] Figure 3 The crystal stacking structure diagram of the organic photothermal eutectic material obtained in Example 1;

[0032] Figure 4 The XRD diffraction pattern and simulated XRD pattern of the organic photothermal eutectic material obtained in Example 1;

[0033] Figure 5 The ultraviolet-visible light absorption diagram of the organic photothermal eutectic material obtained in Example 1;

[0034] Figure 6 This is the photothermal performance curve of the organic photothermal eutectic material;

[0035] Figure 7 The photothermal performance curve of the organic photothermal eutectic material at different power densities;

[0036] Figure 8 This is the photothermal stability test curve of the organic photothermal eutectic material;

[0037] Fig. 9 Schematic diagram of the device for testing the evaporation of organic photothermal eutectic materials in clean water;

[0038] Fig.10 To test the production performance of the obtained clean water;

[0039] Fig.11 This is the output voltage curve of the thermal eutectic material during the photothermal-electrical conversion process. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] Example 1

[0042] An organic photothermal eutectic material is prepared by the following method:

[0043] The donor molecules and the acceptor molecules are uniformly dispersed in a solvent, ultrasonically dispersed, and allowed to stand until the solvent is completely volatilized to obtain the organic photothermal eutectic material.

[0044] The donor molecule is:

[0045]

[0046] The receptor molecule is:

[0047]

[0048] The molar ratio of the donor molecule to the acceptor molecule is 1:1, and the solvent is dichloromethane.

[0049] Simple and easy preparation methods of organic photothermal eutectics such as Figure 1 As shown: the donor molecule and the acceptor molecule are dissolved in a solvent of dichloromethane according to a stoichiometric ratio of 1:1 and evaporated at 25°C for 48 hours. The organic photothermal eutectic obtained by this method has a black metallic luster, such as Figure 2 shown.

[0050] Figure 3The crystal structure was analyzed by using a Bruker SMART APEX II instrument (ray emission target Cu Kα, λ=0.154nm, 100K) for data acquisition and single crystal structure analysis using Olex2 software. The donor and acceptor molecules in the organic photothermal co-crystal present face-to-face π-π close stacking, providing a material basis for the excellent photothermal effect.

[0051] Figure 4 What is shown is the XRD spectrum of the organic photothermal eutectic material and the standard crystal. It can be seen that the synthesized organic photothermal eutectic material is consistent with the standard crystal material, indicating that the crystal material is successfully synthesized and has high quality.

[0052] like Figure 5 As shown, the organic photothermal eutectic exhibits an ultra-wide range of light absorption capabilities, with an absorption wavelength of about 2400nm, showing strong light capture capabilities.

[0053] Example 2

[0054] This example is a test of the photothermal performance of the organic photothermal eutectic material prepared in Example 1.

[0055] 100 mg of organic photothermal eutectic material was weighed, ground into powder with a mortar, and then pressed into discs with a diameter of 1 cm. The organic photothermal eutectic material powder was irradiated with an 808 nm laser, and the real-time temperature was monitored using an infrared thermal imager.

[0056] Figure 6 The photothermal performance curve of the organic photothermal eutectic material. It can be seen that the prepared organic photothermal eutectic material has excellent photothermal conversion performance. It can be quickly heated to around 100°C within 30s.

[0057] Figure 7 The photothermal performance curves of organic photothermal eutectic materials at different power densities. It can be seen that the equilibrium temperature of organic photothermal eutectic materials increases with the increase of laser power density, indicating that the highest equilibrium temperature of the eutectic can be flexibly adjusted by adjusting the laser power density.

[0058] Figure 8 This is the photothermal stability test curve of the organic photothermal eutectic material. By testing the powder XRD structure of the material under different irradiation times, it can be seen that after 12 hours of irradiation test, the organic photothermal eutectic powder still maintains a good crystal structure.

[0059] Example 3

[0060] 80 mg of organic photothermal eutectic material powder was weighed and placed in a PDMS sponge and placed in a beaker of Bohai Sea water. The evaporator was irradiated with a xenon lamp solar simulator with a wavelength range of 220-2500 nm, and 0.1 mg of Taiping was used to monitor the mass change of water evaporation.

[0061] Fig. 9 Schematic diagram of the device for testing the evaporation of organic photothermal eutectic materials in clean water. The production performance of clean water obtained by the test is as follows Fig.10 As shown, it can be seen that compared with the blank, the organic photothermal eutectic material has excellent photothermal performance and exhibits a power output voltage of 156mV, showing an excellent clean electricity production effect.

[0062] Fig.11 The output voltage curve of the organic photothermal eutectic material in the photothermal-electrical conversion process is shown in Figure 2. It can be seen that compared with the blank, the organic photothermal eutectic material has excellent photothermal and photothermal-electrical properties, providing a clean electricity production effect.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Application of an organic photothermal eutectic material in clean water and power cogeneration, characterized in that: The organic photothermal eutectic material is formed by self-assembly of a donor and an acceptor through a simple solution volatilization method, wherein: The structural formula of the donor is: The structural formula of the receptor is: The molar ratio of donor molecules to acceptor molecules is 1:

1.

2. The use according to claim 1, characterized in that The method for preparing the organic photothermal eutectic material comprises the following steps: The donor molecules and the acceptor molecules are uniformly dispersed in a solvent, ultrasonically dispersed, and volatilized in an environment of -10°C to 200°C for 0-150 hours (excluding 0 hour) to obtain the organic photothermal eutectic material.

3. The use according to claim 2, characterized in that The solvent is dichloromethane, acetonitrile, tetrahydrofuran or chloroform.

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