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ZnIn2S4 photocatalyst synergistically modified by hole assistant Ti(IV) and electron assistant MXene QDs

A technology of znin2s4, catalyst

Active Publication Date: 2021-06-04
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the severe photogenerated carrier recombination rate and low visible light utilization limit ZnIn 2 S 4 practical application, in order to further improve the ZnIn 2 S 4 The efficiency of photocatalytic hydrogen production can better meet the needs of practical applications. Existing research has improved ZnIn 2 S 4 Photocatalytic hydrogen production activity
But overall, ZnIn 2 S 4 Photocatalytic hydrogen production activity is still low and needs to be further improved
There is no information about ZnIn 2 S 4 / Ti(IV) / MXene QDs Composite Photocatalyst Report

Method used

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  • ZnIn2S4 photocatalyst synergistically modified by hole assistant Ti(IV) and electron assistant MXene QDs
  • ZnIn2S4 photocatalyst synergistically modified by hole assistant Ti(IV) and electron assistant MXene QDs
  • ZnIn2S4 photocatalyst synergistically modified by hole assistant Ti(IV) and electron assistant MXene QDs

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Experimental program
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Effect test

Embodiment 1

[0040] 1. This step provides ZnIn 2 S 4(ie ZIS) photocatalyst preparation, its preparation method comprises the following steps.

[0041] 0.136g (1mmol) ZnCl 2 , 0.586g (2mmol) InCl 3 4H 2 O. Dissolve 0.46g (6mmol) thioacetamide in 80mL deionized water and stir for 30min to obtain a suspension. The suspension obtained above was transferred into a 100mL reaction kettle with a polytetrafluoroethylene substrate, and placed in an oven at 80°C for 12h. Naturally cool to room temperature after the reaction, centrifuge to obtain a yellow powder sample, wash the yellow powder sample several times with deionized water and absolute ethanol, and dry it in a common oven at 60°C for 5 hours to obtain pure ZIS powder.

[0042] 2. This step provides ZIS / Ti (0.2wt.％) The preparation of photocatalyst, its preparation method comprises the following steps.

[0043] To 1.0g ZnIn 2 S 4 Add 10mL of 0.2g / L Ti(SO 4 ) 2 solution, raise the temperature of the suspension to 80°C, stir at 500r...

Embodiment 2

[0048] Embodiment 2: this step provides ZIS / Ti (0.2wt.％) / MQDs (1wt.％) The preparation of photocatalyst, its preparation method comprises the following steps.

[0049] Stir 2.0 g of LiF and 40 mL of 9M HCl in a Teflon beaker for 30 min. Add 2.0g of MAX-Ti 3 AlC 2 Slowly added to a polytetrafluoroethylene beaker, and set the temperature to 35°C, and continued to stir for 24h. Then centrifuge at 3500rpm for 10min, and wash with deionized water several times until the pH value of the supernatant poured out after centrifugation is 5 to obtain solid Ti 3 C 2 (MXene) powder. At 1.0g Ti 3 C 2 Add 40 mL of absolute ethanol to the solution, sonicate for 1 h, then centrifuge at 10,000 rpm for 10 min to collect the suspended Ti 3 C 2 Nanosheets. Add 20 mL of deionized water to the unexfoliated particles, place in a cell crushing device at 80% power for 1 h, and then centrifuge at 3500 rpm for 3 min to collect the suspended Ti 3 C 2 Nanosheets. Repeat the above steps severa...

Embodiment 3

[0052] Embodiment 3: this step provides ZIS / Ti (0.2wt.％) / MQDs (3wt.％) The preparation of photocatalyst, its preparation method comprises the following steps.

[0053] Stir 2.0 g of LiF and 40 mL of 9M HCl in a Teflon beaker for 30 min. Add 2.0g of MAX-Ti 3 AlC 2 Slowly added to a polytetrafluoroethylene beaker, and set the temperature to 35°C, and continued to stir for 24h. Then centrifuge at 3500rpm for 10min, and wash with deionized water several times until the pH value of the supernatant poured out after centrifugation is 5 to obtain solid Ti 3 C 2 (MXene) powder. At 1.0g Ti 3 C 2 Add 40 mL of absolute ethanol to the solution, sonicate for 1 h, then centrifuge at 10,000 rpm for 10 min to collect the suspended Ti 3 C 2 Nanosheets. Add 20 mL of deionized water to the unexfoliated particles, place in a cell crushing device at 80% power for 1 h, and then centrifuge at 3500 rpm for 3 min to collect the suspended Ti 3 C 2 Nanosheets. Repeat the above steps severa...

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Abstract

The invention relates to a ZnIn2S4 photocatalyst synergistically modified by a hole assistant Ti(IV) and an electron assistant MXene QDs, belongs to the technical field of photocatalysis, and particularly discloses a ZIS / Ti / MQDs composite photocatalyst, a preparation method and application thereof. The ZIS / Ti / MQDs composite photocatalyst comprises, by mass, 1%-4% of MXene quantum dots; and 96%-99% of a ZIS / Ti mixture; the ZIS / Ti mixture is ZnIn2S4 doped with Ti(IV), and the doping mass percent of the Ti(IV) is 0.2%. According to the invention, ZnIn2S4 is synergistically modified by utilizing the hole assistant Ti(IV) and the electron assistant MXene QDs, and abundant active sites are provided for hydrogen evolution reaction. The preparation method provided by the invention is simple in process, and the prepared composite photocatalyst has very high efficiency of catalytically cracking water to produce hydrogen when no noble metal is used as a cocatalyst, is high in photocatalytic activity, low in cost and pollution-free, can be recycled, and is high in application and popularization performance.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and more specifically, relates to a ZnIn2S4 composite photocatalyst synergistically modified by a hole assistant Ti(IV) and an electron assistant MXene QDs and its preparation method and application. The present invention utilizes the hole assistant Ti (IV) Synergistic modification of ZnIn with electronic additives MXene QDs 2 S 4 , providing abundant active sites for the hydrogen evolution reaction. Background technique [0002] With the increasingly serious problems of environmental pollution and energy shortage, the development of renewable, sustainable, environmentally friendly and clean energy has become the primary task of current researchers. Therefore, converting the inexhaustible sunlight into the clean energy needed by human beings has become a current research hotspot. A large number of existing studies have found that semiconductor photocatalysis technology can use abundant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J27/22B01J35/00C01B3/04
CPCB01J27/04B01J27/22C01B3/042B01J35/39Y02E60/36
Inventor 陈志鸿杨丽琴王新
Owner SOUTH CHINA NORMAL UNIVERSITY
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