Electronic Materials Letters
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2022
·Vol. 19
·期 1
·94-107
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IF 3.151
Luo Menghao,Feng Hange,Hu Yuechuan,Chen Keke,Dong Zibo,Xue Shaolin
Abstract Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55 times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Ning Liu,Rumin Li,Jiahui Zhu,Qi Liu,Rongrong Chen,Jing Yu,Ying Li,Hongsen Zhang,Jun Wang
In the present research, ZnS/WO 3 composites were prepared by coprecipitation method to construct the Z-scheme heterojunction photocatalyst with high efficiency electron separation for the photocatalytic reduction of U(VI). Compared with WO 3 and ZnS, the visible light absorption, photoreduction ability and photocatalytic activity of ZnS/WO 3 composites were improved. The ZnS/WO 3 composites show higher photoreduction U(VI) performance under visible light irradiation with the maximum extraction capacity of U(VI) at 1.52 g g −1 . The ZnS/WO 3 composites exhibit high uranium reduction ability under natural light with removal efficiency reaching 93.4 %. In-situ monitoring experiments and DFT calculations were designed to explore the mechanism and pathway of photoelectron transfer in the reduction process from U(VI) to U(IV). The results show that ZnS/WO 3 has an internal electric field to form a Z-scheme electron transfer , and uranium reduction is a dual-electron transfer pathway. In addition, the band gap regulation mechanism of binary composite semiconductor materials is deeply discussed.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Kejie Jin,Mian Qin,Xinyi Li,Rui Wang,Yang Zhao,Huan Wang
Semiconductor photocatalysis can be regarded as one of effective strategies to overcome the great challenges encountered with conventional technologies for environmental remediation. In this research, Z-scheme heterostructure composed of core–shell Au@TiO 2 nanoparticles and flower-like Bi 2 WO 6 nanosheets has been successfully prepared through the reverse micelle sol–gel method followed by a hydrothermal process. The structural characteristics, chemical compositions and photoelectrochemical properties of this ternary composite photocatalyst (Au@TiO 2 /Bi 2 WO 6 ) were further investigated in detail. Benefitted from the synergy of the heterojunction construction and metallic surface plasmon resonance effect, the Au@TiO 2 /Bi 2 WO 6 with an optimal mass ratio of Au@TiO 2 to Bi 2 WO 6 exhibited the significantly enhanced photocatalytic activity for degradation of antibiotics under visible-light irradiation, in which the degradation efficiency of sulfamethoxazole (SMX) and tetracycline hydrochloride (TC) could be up to 96.9% and 95.0% within 75 min, respectively. The reaction rate constant for SMX and TC degradation was calculated to be around 0.0425 min −1 and 0.0314 min −1 , which has 7.2 times and 1.9 times enhancement compared with single Bi 2 WO 6 , respectively. In addition, the cyclic stability and photocatalytic mechanism of Au@TiO 2 /Bi 2 WO 6 were further verified. Our primary results provide a feasible strategy to develop core–shell heterostructured photocatalysts with superior performance for the efficient removal of low-concentration antibiotics in water.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
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IF 7.926
Nannan Geng,Wei Chen,Hang Xu,Mingmei Ding,Zongli Xie,Anqi Wang
Because of the unique advantages, ultrasound (US) has become a popular technology for water organic treatment. In order to compensate for the disadvantages of expensive equipment and large energy input caused by US, researchers combine US with iron-based sono-catalyst to realize the rapid and efficient degradation of pollutants. Aiming at the ultrasonic hot spot and sonoluminescence effect, in this work, Z-type heterojunction sono-catalyst Fe II -MIL-88B/GO/P25 (Fe II -MGP) was synthesized for TC-HCl removal. The physicochemical properties of the material were characterized by SEM, XRD , XPS and BET. The addition of GO contributed to the formation of the Z-Scheme heterojunction. At the optimal reaction conditions determined by influential factor experiments (ultrasonic power of 100 W, sono-catalyst dose of 0.3 g/L, H 2 O 2 dose of 20 mM and pH 5), in only 7 min, 83.3 % of TC-HCl was removed, and the TOC degradation efficiency reached 52.2 %. The contrast experiment demonstrated that the US/Fe II -MGP/H 2 O 2 system had the best pollutant removal performance. After three repeated experiments, the removal efficiency decreased by only 6 %. ∙OH was identified as the major radical from the quenching experiments and technical EPR. UV–vis and Mott-Schottky measurements suggested that the possible carrier transfer paths followed the Z-Scheme heterojunction model.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yanyan Cui,Ping Zhang,Mengke Li,Chengcheng Lin,Yaling Wang
Photocatalysis technology is considered an effective way to solve the problem of water pollution and energy shortage, and is hinged on the development of the photocatalyst . In this study, p-type semiconductor AgFeO 2 and the n-type photocatalyst Ag 3 VO 4 formed a p-n junction via a simple hydrothermal method . Compared with pure Ag 3 VO 4 , the 4 % AgFeO 2 -modified Ag 3 VO 4 photocatalyst (AgVFe-4) exhibited the best photocatalytic activity: the photodegradation rate of RhB reached 95.1 % within 60 min and possessed good photostability under UV–visible light irradiation. The physical and chemical properties of AgVFe-4 indicated that the composite structure showed a larger special surface area, much lower intensity of photoluminescence , and higher photogenerated carriers separation efficiency. The p-type AgFeO 2 and n-type Ag 3 VO 4 could form the p-n junction structure. Based on the analysis of reactive agents, the h + , •O 2 − and •OH were the main active species during organic pollutions photodegradation, and the photocatalysis process followed the Z-scheme mechanism. Meanwhile, some silver element in the photocatalyst was reduced into Ag 0 , which could act as the recombination center of the photogenerated carriers, further improving the photocatalytic performance. This work may arouse an increasing interest in designing more Z-scheme silver-based p-n junction heterojunction photocatalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 11
·1-13
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IF 2.8
Liu Jinsong,Sun Zhongbao,Wu Zhengying,Huang Yanfang,Zhu Kongjun,Zheng Hongjuan,Wang Jie,Chen Jiankang
AgBr/Bi 2 SiO 5 photocatalyst with Z-scheme structure was obtained via a hydrothermal reaction, calcination, and in situ precipitation process. The as-prepared AgBr/Bi 2 SiO 5 composite photocatalytically degraded 96.2% of RhB under visible light irradiation within 30 min. Moreover, the photodegradation efficiency remained above 81.7% after being reused five times. Trapping experiments revealed that ·O 2− was the main reactive species during RhB photodegradation. The degradation mechanism study of AgBr/Bi 2 SiO 5 showed that the Z-scheme structure between AgBr and Bi 2 SiO 5 facilitated the separation of charge carriers, thereby improving the photocatalytic degradation with the assistance of a dye sensitization effect. This work provides a reference for developing other Z-scheme photocatalysts for the removal of organic pollutants.
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DALTON TRANSACTIONS
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2023
·Vol. 52
·期 47
·17711-17716
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IF 4
Xudun Shen,Liping Huang,Shuaishuai Li,Longnian Tang,Qiumei Lei,Bowang Zhao,Huilian Hao,Wenyao Li,Min Zeng,Guanjie He
We used sodium hydroxide-mediated approach and tannic acid etching to prepare hollow structured trimetallic MOF-derived CoFeNi/Z-P NC nanocomposites. Remarkably, the resulting CoFeNi/Z-P NC nanocomposites have large specific surface area and mesoporous structure, making their active sites more accessible and mass transfer more effective. More complex trimetallic components provide greater possibilities for further improving electrocatalytic performance. The CoFeNi/Z-P NC nanocomposites demonstrate notable enhancements for the OER, and 10 mA cm−2 current density is achieved at a low overpotential of 244 mV, with a low Tafel slope of 66.2 mV dec−1 and have good stability in alkaline solutions. In addition, as a cathode material for overall alkaline water splitting, CoFeNi/Z-P NC is better than RuO2 with longer cycling stability.
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Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Jinghao Hua,Sheng Feng,Changchang Ma,Haitao Huang,Kai Wei,Xiaojun Dai,Kaidi Wu,Haihong Wang,Zhaowei Bian
In this study, a novel 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst was prepared by combining NiFe-LDH with Bi 5 O 7 Br through self-assembly. Under simulated solar irradiation, compared with pure NiFe-LDH and Bi 5 O 7 Br, the 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst revealed a significant improvement in the efficiency of photocatalytic reduction of CO 2 . Z-scheme heterojunction promotes the separation of photo generated charge carriers and 2D/2D structure is conducive to exposing more active site and enhancing the migration rate of interface carriers. The photocatalytic activity experiment revealed that the CH 4 production efficiency of the Bi 5 O 7 Br/NiFe-LDH (37.77 μmol/g/h) after 8 h of light exposure was 2 times and 10 times that of Bi 5 O 7 Br (22.41 μmol/g/h) and NiFe-LDH (3.84 μmol/g/h), respectively. The successful formation of Z-scheme heterojunction was determined through band analysis and related characterization. The advantage of Z-scheme heterojunction is that it has high electron mobility and low resistivity. This work launches a feasible design strategy of special structure photocatalysts to enhance the photocatalytic activity for the CO 2 reduction.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 6
·1-15
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IF 20.1
Tang Jijun,Gao Guicheng,Luo Weiqi,Dai Qiuyang,Wang Yuchen,Elzilal Hala A.,Abo-Dief Hala M.,Algadi Hassan,Zhang Jiaoxia
Domestic wastewater contains trace amounts of organic pollutants that are difficult to remove, such as antibiotics and dyes, so effective degradation technologies need to be found. Therefore, we report the fabrication of a novel Z-scheme MIL-125(Ti)/GO photocatalyst by an in-situ growing method. The photodegradation experiment showed that MIL-125(Ti)/GO degraded TC by 81.1% at 5% GO addition, which is 1.7 and 3.8 times higher than MIL-125(Ti) and GO, respectively. The degradation rate reached 0.0201 min −1 , 3.3 times and 8.1 times higher than MIL-125 (Ti) and GO, respectively. The study shows that GO and MIL-125(Ti), as electron donors and electron acceptors, respectively, form a Z-scheme heterojunction structure, which effectively improves the photocatalytic performance of MIL-125(Ti). MIL-125(Ti)/GO has excellent structural stability and reusable availability, and the main reactive radicals are ·O − 2 and h + . This study provides new insights into the design and fabrication of MIL-125 (Ti) derivatives as photodegrading organic pollutants.
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MOLECULES
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2023
·Vol. 28
·期 18
·6554
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IF 4.6
Yue Chang,Kaili Suo,Yuhang Wang,Xiaona Ren,Jiangli Cao
In this work, a TiO2/In2S3heterojunction film was successfully synthesized using a one-step hydrothermal method and applied in the photocathodic protection (PCP) of 304SS. The octahedral In2S3and In2S3@TiO2nanoparticles combined and coexisted with each other, with In2S3quantum dots growing on the surface of TiO2to form In2S3@TiO2with a wrapping structure. The composite photoelectrode, which includes TiO2with a mixed crystalline phase and In2S3, exhibited significantly enhanced PCP performance for 304SS compared with pure In2S3and TiO2. The In2S3@TiO2/In2S3composites with 0.3 g of P25 titanium dioxide (P25) showed the best protection performance, resulting in a cathodic shift of its OCP coupled with 304SS to −0.664 VAgCl. The electron transfer tracking results demonstrate that In2S3@TiO2/In2S3forms a Z-scheme heterojunction structure. The enhanced PCP performance could be attributed to the synergistic effect of the mixed crystalline phase and the Z-scheme heterojunction system. The mixed crystalline phase of TiO2provides more electrons, and these electrons are gathered at higher energy potentials in the Z-scheme system. Additionally, the built-in electric field further promotes the more effective electrons transfer from photoelectrode to the protected metals, thus, leading to enhanced photoelectrochemical cathodic protection of 304SS.
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ACS Nano
·
2021
·
IF 15.881
Shufang Chang,Jinxing Yu,Ran Wang,Qingyang Fu,Xiaoxiang Xu
LaTaON2 porous single crystals (PSCs), integrating structural coherence and porous microstructures, will warrant promising photocatalytic performance. The absence of grain boundaries in PSCs ensures rapid photocarrier transportation from bulk to the surface, thereby mitigating photocarriers’ recombination. Porous microstructures not only provide ample reachable surface to host photochemical reactions but also reinforce photon-matter interactions by additional photon reflection/scattering. Here, we have synthesized LaTaON2 PSCs via a topotactic route and show significantly improved photocatalytic performance. Efficient water oxidation into O2 has been realized by LaTaON2 PSCs with an apparent quantum efficiency as high as 5.7% at 420 ± 20 nm. Stable overall water splitting into stoichiometric H2 and O2 has also been achieved in a Z-scheme setup using LaTaON2 PSCs as the O2 evolution photocatalyst. These results not only prove that PSCs facilitate photocarrier migrations, which in turn deliver exceptional photocatalytic performance, but also imply that PSCs are useful to reinvigorate conventional semiconductor photocatalysts toward efficient solar energy conversions.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Wen Ge,Kong Liu,Shukang Deng,Lanxian Shen,Peizhi Yang
Construction of heterostructure is an efficient approach to improve the photocatalytic performance of catalysts. Herein, the Bi 6 Fe 1.5 Co 0.5 Ti 3 O 18 (BFCTO) nanoplates are successfully loaded on g-C 3 N 4 nanosheets by a facile chemical process for the first time. The photocatalytic activity of all g-C 3 N 4 /BFCTO catalysts are measured by the degradation of Rhodamine B (RhB) under visible-light irradiation. The results display that g-C 3 N 4 /BFCTO heterojunctions exhibit greatly improved photocatalytic activity compared with corresponding bare g-C 3 N 4 and BFCTO catalysts. Based on the experimental results of photocurrent responses, EIS and ESR, it is clearly demonstrated that the improved activity is attributed to the formation of Z-scheme photocatalyst. The g-C 3 N 4 /BFCTO-2 heterojunction showed the optimal photocatalytic activity with the photodegradation efficiency of 84.9% within 20 min. We hope that the work can provide a new insight for exploring Bi n +1 Fe n −3 Ti 3 O 3 n +3 -based Z-scheme heterojunction for pollutant degradation and environment restoration.
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