Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Liu Lulu,Sun Yuanhui,Cui Xiaoqiang,Qi Kun,He Xin,Bao Qiaoliang,Ma Weiliang,Lu Jiong,Fang Hanyan,Zhang Peng,Zheng Lirong,Yu Liping,Singh David J.,Xiong Qihua,Zhang Lijun,Zheng Weitao
Moiré superlattices (MSLs) are modulated structures produced from homogeneous or heterogeneous 2D layers stacked with a twist angle and/or lattice mismatch. Expanding the range of available materials, methods for fabricating MSL, and realization of unique emergent properties are key challenges. Here we report a facile bottom-up synthesis of homogeneous MSL based on a wide-gap 2D semiconductor, BiOCl, using a one-pot solvothermal approach with robust reproducibility. Unlike previous MSLs usually prepared by directly stacking two monolayers, our BiOCl MSLs are realized in a scalable, direct way through chemical growth of spiral-type nanosheets driven by screw-dislocations. We find emergent properties including large band gap reduction ( ∼ 0.6 eV), two-fold increase in carrier lifetime, and strongly enhanced photocatalytic activity. First-principles calculations reveal that such unusual properties can be ascribed to the locally enhanced inter-layer coupling associated with the Moiré potential modulation. Our results demonstrate the promise of MSL materials for chemical and physical functions.
研究领域:
材料科学
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纳米技术
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半导体物理
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光化学
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产品关联
DOI
PubMed
高影响因子
QUIMICA NOVA
·
2025
·
IF 0.7
Meng Shuangyan,Liu Bin,Xie Minglin,Yun Chaoxin,Qiang Jin,He Kaizhou,Yang Zhiwang,Wang Xiangqian
A composite photocatalyst, xTCN (xOTiO2/g-C3N4, where x represents the added quantity of graphite carbon nitride (g-C3N4)), was synthesized using a straightforward one-step hydrothermal method with H2O2 as an oxidant. The H2O2 incorporation into the xTCN composite facilitated the enrichment of oxygen (O) in titanium dioxide (TiO2). This synthesis process effectively reduced the bandgap energy, minimizing the recombination of photogenerated carriers. Concurrently, an O atom was integrated into the g-C3N4 molecule, which altered its bandgap structure and enhanced the photogenerated electron-hole separation efficiency. The dual modification effect was observed when 0.9TCN was used as the catalyst, which converted 77% of benzalcohol with a selectivity exceeding 99%. Additionally, five cycles of reuse only slightly decreased the benzalcohol conversion (by 16%) and selectivity (by 9%), indicating good reusability of the xTCN photocatalyst. The xTCN photocatalyst had an unchanged molecular structure before and after the photocatalytic reaction, demonstrating its superior light stability. The potential photocatalytic reaction mechanism was explored through an active species capture experiment and a Mott-Schottky (M-S) curve test. The results of these studies suggested that •O2- and •OH were the primary reactive species in the photocatalytic reaction.
研究领域:
材料科学
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催化
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环境化学
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纳米技术
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化学工程
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 8
·3381-3393
·
IF 3.134
Yang Haoguo,Guo Yijun,Han Shitong,Xi Hailing,Lin Huaxiang,Yuan Rusheng,Ding Zhengxin,Long Jinlin,Lin Qun
Mustard gas is a kind of erosive poison with great harm and used as a chemical weapon since World War. It has suggested that the photocatalytic technology is an effective method to eliminate it. Because the small difference in molecular structure between 2-CEES and Mustard gas, and the less toxic of 2-CEES, 2-CEES is often used as a simulator to evaluate the photocatalytic activity of catalysts. In this work, symbiotic mixture of Bi 2 WO 6 and Bi 6 O 6 (OH) 3 (NO 3 ) 3 ·1.5H 2 O nanosheets doped with Mo (Mo-B-B) have been synthesized by a facile hydrothermal treatment. The samples were characterized by XRD, DRS, XPS, SEM, TEM, Raman, and PL. The photocatalytic activity of the samples was evaluated by measuring the degradation of 2-CEES under visible light irradiation. The results showed that the doped Mo reduce the Eg of bare symbiotic mixture and improve the separation efficiency of photo-generated carriers that is beneficial to photocatalytic activity. The optimum amount of doped Mo is 5% that exhibits the best activity for degradation for 2-CEES.
研究领域:
材料科学
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环境科学
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化学工程
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纳米技术
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光催化
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yuan Meng,Zhifeng Li,Jie Tan,Jie Li,Junxue Wu,Tingting Zhang,Xiaohui Wang
Due to the effective removal of refractory organic pollutants, advanced oxidation technology based on sulfate radicals (SO 4 · - ) has attracted widespread attention. However, it is still a challenge to design an eco-friendly catalyst that efficiently activates persulfate. In this paper, oxygen-doped porous graphitic carbon nitride (OCN) was prepared by a simple thermal polymerization method to activate persulfate for removing the stubborn drug carbamazepine and showed a good removal effect. Compared with the pristine g-C 3 N 4 , the catalytic performance of OCN increased by 5.6 times under dark conditions and 4.1 time under visible light irradiation conditions, respectively. Under dark conditions, oxygen doping mainly modulated the electronic structure of the catalyst to provide more active sites to enhance persulfate activation. Under visible light conditions, oxygen doping reduced the band gap and introduced impurity defect energy level, so that the light absorption capacity was improved and photo-generated carriers were effectively separated. The results of electron paramagnetic resonance and active species trapping experiments showed that the combined action of free radicals and non-radical oxidation pathways was the main mechanism of carbamazepine degradation. Therein, singlet oxygen ( 1 O 2 ) was the main active species, followed by O 2 · - and SO 4 · − . In addition, environmental factor experiments showed that chloride ions, bicarbonate ions and humic acid all had significant promoting effects, and there were other interactions between humic acid and carbamazepine besides adsorption to promote the degradation reaction. Finally, high-resolution mass spectrometry identified that ring condensation, hydroxylation and carboxylation were the primary degradation pathways of carbamazepine. This work provides a feasible way for designing high-efficiency and pollution-free persulfate activators to remove refractory pollutants.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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DOI
高影响因子
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