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Lei Su

Bio: Lei Su is an academic researcher from Beijing University of Chemical Technology. The author has contributed to research in topics: Lamellar structure & Langmuir adsorption model. The author has an hindex of 2, co-authored 5 publications receiving 22 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, hemispherical shell-thin lamellar Tungsten disulfide (WS2) porous structures have been designed to make use of synergistic effect between slow photo effect of WS2 pore and high electron transfer of 2D WS2 for promoting photocatalyst activity.

53 citations

Journal ArticleDOI
TL;DR: In this paper, a two-dimensional transition metal disulfide (2D TMD) cocatalyst with a unique lamellar flower-like porous structure was fabricated to boost the photocatalytic H2 evolution of CdS.

24 citations

Journal ArticleDOI
TL;DR: In this article, transition metal disulfides of both ReS2 and MoS2 were explored as cocatalysts for CdS photocatalyst, and the effect of rhenium on the photocatalytic activity was confirmed and optimized.

19 citations

Journal ArticleDOI
01 Jun 2020
TL;DR: In this paper, a series of sulfur-incorporated Cu2O nanomaterials are synthesized by a facile chemical reduction method, which favors the formation of small sized S-Cu2O particles in the range of 50-100nm and their enhanced adsorption performances.
Abstract: Cu2O-based materials are potential adsorbents for the removal of anionic dyes pollutions. Herein, sulfur incorporation is designed to promote adsorption capacity of Cu2O. A series of sulfur-incorporated Cu2O nanomaterials are synthesized by a facile chemical reduction method. Sulfur incorporation favors the formation of small sized S-Cu2O particles in the range of 50–100 nm and their enhanced adsorption performances. The S-Cu2O particles show good adsorption activities for methyl orange solution (75–500 mg L−1) under pH 6–10 at room temperature. A superior adsorption capacity of 1485.24 mg g−1 for the removal of methyl orange is achieved on the S-Cu2O adsorbent. Adsorption behaviors of the S-Cu2O adsorbent fit well with Langmuir isotherm and pseudo-second-order kinetic model. Adsorption thermodynamic results indicate the exothermic and spontaneous adsorption process. Anionic dye can be adsorbed selectively on the S-Cu2O adsorbent and separated from cationic dyes. Density functional theory calculations prove a pronounced electron accumulation on sulfur sites, benefiting to the adsorption on S-Cu2O. A nonmetallic element incorporation for improving adsorption capacity of metal oxide adsorbents is provided as a promising strategy for other adsorbents.

4 citations

Journal ArticleDOI
20 Oct 2021-Langmuir
TL;DR: In this paper, a ternary Co1-xS@ZnCoS/CdS composites are constructed as photocatalysts through the hydrothermal formation of Co1xS and zinc nanoparticles on CdS nanorods.
Abstract: Photocatalytic reactions over effective photocatalysts are attractive to explore clean hydrogen energy from water with the utilization of solar energy. Ternary Co1-xS@ZnCoS/CdS (ZCS/CdS) composites are constructed as photocatalysts through the hydrothermal formation of Co1-xS and ZnCoS nanoparticles on CdS nanorods. Superior to the binary Co1-xS/CdS composite, ZCS/CdS shows the improved photocatalytic activity with a hydrogen production rate of 58.4 mmol·g-1·h-1, which is 31.4 and 2.1 times higher than those of CdS and Co1-xS/CdS, respectively. Different from binary Co1-xS/CdS, the participation of a small amount of zinc favors the formation of ZnCoS solid solution in ZCS/CdS. A synergistic promotion effect of ZnCoS and Co1-xS is confirmed due to tight heterojunctions among Co1-xS, ZnCoS, and CdS in ZCS/CdS. The unique heterostructure of ZCS/CdS benefits its enhanced absorption ability of visible light, accelerating the separation of photoinduced electron-hole pairs and the electron transfer. ZCS/CdS exhibits the strong reduction ability and superior photocatalytic stability due to the role of double Z-scheme electron transfer pathways in the ternary composite. This work provides a suitable way to tune noble metal-free composite photocatalysts for efficient H2 production.

4 citations


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Journal ArticleDOI
TL;DR: In this article , a review of the recent advances, challenges, and opportunities for removal, degradation, and electrochemical sensing 4-aminophenol (4-AP) in real samples is presented.
Abstract: p_Aminophenol, namely 4-aminophenol (4-AP), is an aromatic compound including hydroxyl and amino groups contiguous together on the benzene ring, which are suitable chemically reactive, amphoteric, and alleviating agents in nature. Amino phenols are appropriate precursors for synthesizing oxazoles and oxazines. However, since the toxicity of aniline and phenol can harm human and herbal organs, it is essential to improve a reliable technique for the determination of even a trace amount of amino phenols, as well as elimination or (bio)degradation/photodegradation of it to protect both the environment and people's health. For this purpose, various analytical methods have been suggested up till now, including spectrophotometry, liquid chromatography, spectrofluorometric and capillary electrophoresis, etc. However, some drawbacks such as the requirement of complex instruments, high costs, not being portable, slow response time, low sensitivity, etc. prevent them to be employed in a wide range and swift in-situ applications. In this regard, besides the efforts such as (bio)degradation/photodegradation or removal of 4-AP pollutants from real samples, electroanalytical techniques have become a promising alternative for monitoring them with high sensitivity. In this review, it was aimed to emphasize and summarize the recent advances, challenges, and opportunities for removal, degradation, and electrochemical sensing 4-AP in real samples. Electroanalytical monitoring of amino phenols was reviewed in detail and explored the various types of electrochemical sensors applied for detecting and monitoring in real samples. Furthermore, the various technique of removal and degradation of 4-AP in industrial and urban wastes were also deliberated. Moreover, deep criticism of multifunctional nanomaterials to be utilized as a catalyst, adsorbent/biosorbent, and electroactive material for the fabrication of electrochemical sensors was covered along with their unique properties. Future perspectives and conclusions were also criticized to pave the way for further studies in the field of application of up-and-coming nanostructures in environmental applications.

90 citations

Journal ArticleDOI
01 Feb 2022-Langmuir
TL;DR: In this article , an S-scheme heterojunction was constructed on the basis of the modification of a Ni-based metal-organic framework (Ni-MOF) by different in situ treatment strategies.
Abstract: Here, an S-scheme heterojunction was constructed on the basis of the modification of a Ni-based metal-organic framework (Ni-MOF) by different in situ treatment strategies. First, NiS2, NiO, and Ni2P were derived in situ on the surface of Ni-MOF through surface sulfonation, oxidation, and phosphatizing treatments. They can efficiently accept the electrons from the conduction band of Ni-MOF as the trap centers, thus improving the hydrogen production activity. Additionally, phosphatizing makes the electronegativity of Ni-MOF/P stronger than that of the original Ni-MOF, which can enhance the absorption of protons, thus promoting the hydrogen evolution reaction. Next, the S-scheme heterojunction was successfully built by the coupling of 2D CeO2 with Ni-MOF/P. The maximum hydrogen production rate of the hybrid catalyst (6.337 mmol g-1 h-1) is 14.18 times that of the untreated Ni-MOF due to the full utilization of photo-induced electrons. Finally, the probable hydrogen evolution mechanism was proposed by analyzing a series of characterization results and by the density functional theory (DFT) calculation.

88 citations

Journal ArticleDOI
TL;DR: In this article , a review of 2D/2D interfaces with state-of-the-art 2D cocatalysts, spanning from carbon-containing to phosphorus-containing, metal dichalcogenide, and other cocatallysts, is presented.
Abstract: Sparked by natural photosynthesis, solar photocatalysis using metal‐free graphitic carbon nitride (g‐C3N4) with appealing electronic structure has turned up as the most captivating technique to the quest for sustainable energy generation and pollution‐free environment. Nonetheless, low‐dimensional g‐C3N4 is thwarted from sluggish kinetics and rapid recombination of photogenerated carriers upon light irradiation. Among multifarious modification strategies, engineering 2D cocatalysts is anticipated to accelerate redox kinetics, augment active sites and ameliorate electron–hole separation of 2D g‐C3N4 for boosted activity thanks to its face‐to‐face contact surface. It is of timely and technological significance to review the 2D/2D interfaces with state‐of‐the‐art 2D cocatalysts, spanning from carbon‐containing to phosphorus‐containing, metal dichalcogenide, and other cocatalysts. Fundamental principles for each photocatalytic application will be introduced. Thereafter, the recent advances of 2D/2D cocatalyst‐mediated g‐C3N4 systems will be critically evaluated based on their interfacial engineering, emerging roles, and impacts toward stability and catalytic efficiency. Importantly, mechanistic insights into the charge dynamics and structure–performance relationship will be deciphered. Last, noteworthy research directions are prospected to deliver insightful ideas for future development of g‐C3N4. Overall, this review is anticipated to serve as a scaffold and cornerstone in designing dimensionality‐dependent 2D cocatalyst‐assisted g‐C3N4 toward renewable energy and ecologically green environment.

67 citations

Journal ArticleDOI
TL;DR: In this article, the NiTiO3-CuI-GD ternary system was successfully constructed based on morphology modulation and energy band structure design, and the unique spatial arrangement of the composite catalyst was utilized to improve the hydrogen production activity under light.
Abstract: As the demand of fossil fuels continues to expand, hydrogen energy is considered a promising alternative energy. In this work, the NiTiO3-CuI-GD ternary system was successfully constructed based on morphology modulation and energy band structure design. First, the one-pot method was used to cleverly embed the cubes CuI in the stacked graphdiyne (GD) to prepare the hybrid CuI-GD, and CuI-GD was anchored on the surface of NiTiO3 by simple physical stirring. The unique spatial arrangement of the composite catalyst was utilized to improve the hydrogen production activity under light. Second, to combine various characterization tools and energy band structures, we proposed an step-scheme (S-scheme) heterojunction photocatalytic reaction mechanism, among them, the tubular NiTiO3 formed by the self-assembled of nanoparticles provided sufficient sites for the anchoring of CuI-GD, and the thin layer GD acted as an electron acceptor to capture a large number of electrons with the help of the conjugated carbon network; cubes CuI could consume holes in the reaction system; the loading of CuI-GD greatly improved the oxidation and reduction ability of the whole catalytic system. The S-scheme heterojunction accelerated the transfer of carriers and improved the separation efficiency. The experiment provides a new insight into the construction of an efficient and eco-friendly multicatalytic system.

63 citations

Journal ArticleDOI
TL;DR: In this paper, a step-scheme heterojunction was constructed between two materials, and through this heterjunction, the spatial charge separation was boosted, which led to more useful electrons with a higher reduction ability that participated in a photocatalytic H2 evolution reaction.

54 citations