Method for carrying out surface modification on quantum dot/rod, preparation of photosynthetic catalyst as well as system and method

A modification and quantum dot technology, applied in the chemical industry, can solve problems such as complex extraction or synthesis, lack of surface catalytic sites, instability, etc.

Active Publication Date: 2013-04-24
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such systems have achieved photosynthetic efficiency superior to conventional molecular or semiconductor systems, but such pathways either lack effective surface catalytic sites, or the extraction or synthesis of natural or artificial photosynthetic enzymes serving as catalytic sites is complex and unstable.
So far, there have been no patents or literature reports on the surface modification of quantum dots / rods to assemble simple non-noble metal ion bonds as catalytic active sites onto the surface of quantum dots to construct simple, efficient and durable photosynthesis system

Method used

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  • Method for carrying out surface modification on quantum dot/rod, preparation of photosynthetic catalyst as well as system and method
  • Method for carrying out surface modification on quantum dot/rod, preparation of photosynthetic catalyst as well as system and method
  • Method for carrying out surface modification on quantum dot/rod, preparation of photosynthetic catalyst as well as system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Synthesis of oil-soluble CdSe quantum dots:

[0131] Add 0.06g CdO, 0.28g octylated diphenylamine (abbreviation: ODPA), 3g tri-n-octylphosphine oxide (abbreviation: TOPO) into a 25ml three-neck flask, heat to 300°C under Ar atmosphere, and dissolve CdO until the solution is clear Transparent, inject 1.5g trioctylphosphine (abbreviation: TOP), the temperature rises to 350°C, inject Se precursor (0.058g Se+0.36g TOP), [Cd]:[Se] (molar ratio) = 0.64, The reaction was stopped after 5s to obtain CdSe seeds with a diameter of about 2.6nm. Using the method of alcohol precipitation, it was precipitated, centrifuged, and the liquid was poured out, and then the precipitate was dissolved in chloroform. Quantum dots of different sizes can be obtained by changing the ratio and temperature of the precursors.

Embodiment 2

[0133] Synthesis of oil-soluble CdSe / CdS core-shell nanorods:

[0134] The CdSe seeds synthesized in Example 1 above can be further used to synthesize CdSe / CdS core-shell nanorods: 0.29g ODPA, 0.08g hydroxypropyl acrylate (abbreviation: HPA), 0.06g CdO and 3g TOPO were added to a 25ml three-necked flask , heated to 300°C under Ar atmosphere, CdO was dissolved until the solution was clear, 1.5g TOP was added, the temperature was raised to 350°C, and 0.8umol of CdSe seeds and S precursor (0.12g S+0.15g TOP) were quickly injected, and after 8mins The heating was stopped, and the nanorods were precipitated by alcohol precipitation, and then dissolved in chloroform for other uses. Different sizes of core-shell quantum rods can be obtained by changing the ratio and temperature of the precursors.

Embodiment 3

[0136] Synthesis of oil-soluble CdSe quantum rods:

[0137] Add CdO, n-tetradecylphosphoric acid (hereinafter referred to as: TDPA), n-dodecylamine (hereinafter referred to as: DDA) and TOPO of the quality listed in the following table into a 50ml three-necked flask, and connect the air condenser, The Ar gas was exhausted for 15 min, and the system was heated to 315° C. under Ar atmosphere. The system will dissolve slowly, and the color will change from brown-red to clear and transparent light yellow.

[0138] While the above system is heating, prepare TOPSe according to the configuration in the table below (selenium powder is dissolved in TOP, it needs to be heated to about 300°C). After the above system is clear and transparent, inject TOP and TOPSe into the system, and the temperature of the system drops to 260°C or so, continue to grow CdSe QDs at 270 °C. [Cd]:[Se]=1.6 Quantum dots grow faster in the early stage. If you want to observe their growth changes, you should ta...

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Abstract

The invention relates to a method for carrying out surface modification on a quantum dot / rod, preparation of a photosynthetic catalyst as well as a system and a method. The surface modification is carried out on the quantum dot / rod, and the quantum dot / rod is simply and rapidly used as a carrier; and metal ions which are used as catalytic activity sites are further key-bonded and assembled on the surface of the quantum dot to prepare a high-activity photosynthetic hydrogen-producing photocatalyst and prepare hydrogen. According to the method for carrying out the surface modification on the quantum dot / rod, the preparation of the photosynthetic catalyst as well as the system and the method disclosed by the invention, high-efficiency photosynthetic hydrogen production can be realized by the simple, low-cost and stable photocatalyst; complicated and unstable catalytic activity centers which is natural or artificially-simulated and the like do not need so as to avoid complicated synthesis and system construction; and the method disclosed by the invention has the advantages of efficient reaction, simplicity in reaction, low cost and practical applicability, and provides an effective way for effectively reducing the photosynthetic hydrogen production cost and improving the catalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a photosynthesis catalyst and its preparation and application, in particular to a method for surface modification of quantum dots / rods through a synthesis approach, preparation, system and method of the photosynthesis catalyst. Background technique [0002] Photosynthesis in nature has provided human beings with direct or indirect sources of energy since ancient times. According to statistics, biological photosynthesis can provide 100TW of energy to the earth every year. For example, well-known oil and coal are transformed by nature through photosynthesis and after millions of years. These fossil energy sources have changed the way of life of human beings. Human beings use the energy they provide for heating, driving equipment, synthesizing useful materials and necessities for clothing, food, housing and transportation. However, these fossil fuels are non-renewable and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J27/057B01J27/04B01J31/16B01J31/26B01J31/28B01J31/34B01J31/30C09K11/02C09K11/88C09K11/56C01B3/32
Inventor 吴骊珠李治军樊祥冰王久菊李嘉欣李旭兵李成博于珊佟振合
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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