Biochar
·
2023
·Vol. 5
·期 1
·1-20
·
IF 12.7
Yang Bowen,Dai Jiawei,Zhao Yuan,Wang Zhanchao,Wu Jingwei,Ji Caiya,Zhang Yuhu,Pu Xiao
Biochar-coupled Fe 3 O 4 @SiO 2 /TiO 2 /g-C 3 N 4 composites were successfully constructed through simple sol–gel and calcination methods. The composites efficiently removed high-concentration toxic tetracycline (TC) by means of ·OH and · \({\rm O}_2^{-}\) , whose removal rate exhibited 91.88% during 3 h, and the degradation rate constant reached up to 0.0068 min −1 . The excellent performance can be attributed to the high specific surface area, enhanced visible light response, the introduction of magnetic nanoparticles and biochars expediting charge transfer, Z-scheme heterojunction enhancing the spatial separation of photo-generate carriers and, importantly extraordinary adsorption capacity of 147.96 mg g −1 . Moreover, the composites showed the most excellent efficiency under the calcination temperature of 450 ℃, and exhibited good stability with tolerance to a wide range of pH and anions. Interestingly, a synergistic photocatalytic effect was discovered in the TC/Cr(VI) combined pollution systems, resulting in significantly improved removal of Cr(VI). Besides, the photocatalytic mechanism and degradation path of tetracycline were also elucidated. All these findings suggested the as-synthesized catalyst was an excellent photocatalyst for removal of TC/Cr(VI)-contaminated water. Graphical Abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 20
·20206-20216
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IF 2.8
Wang Peifang,Guo Xiang,Rao Lei,Wang Chao,Guo Yong,Zhang Lixin
A TiO 2 /g-C 3 N 4 composite photocatalytic film was prepared by in situ synthesis method and its photocatalytic capability under weak-visible-light condition was studied. The co-precursor with different ratio of melamine and TiO 2 sol-gel precursor were treated using ultrasonic mixing, physical deposition, and co-sintering method to form the smooth, white-yellow, and compact TiO 2 /g-C 3 N 4 composite films. The prepared TiO 2 /g-C 3 N 4 materials were characterized by SEM, TEM, EDS, XRD, BET, VBXPS, and UV-vis diffuse reflectance spectra. The results of composite showed that TiO 2 and g-C 3 N 4 have close interfacial connections which are favorable to charge transfer between these two semiconductors with suitable band structure, g-C 3 N 4 retard the anatase-to-rutile phase transition of TiO 2 significantly, the specific surface area were increased with g-C 3 N 4 ratio raised. Under weak-light irradiation, composite films photocatalytic experiments exhibited RhB removal efficiency approaching 90% after three recycles. Powders suspension degradation experiments revealed the removal efficiency of TiO 2 /g-C 3 N 4 (90.8%) was higher than pure TiO 2 (52.1%) and slightly lower than pure g-C 3 N 4 (96.6%). By control experiment, the enhanced photocatalysis is ascribed to the combination of TiO 2 and g-C 3 N 4 , which not only produced thin films with greater stability but also formed heterojunctions that can be favorable to charge transfer between these two semiconductors with suitable band structure. This study presents the potential application of photocatalytic film in the wastewater treatment under weak-light situation.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Peng Mei,Huihui Wang,Han Guo,Ning Zhang,Sailun Ji,Yapeng Ma,Jiaqi Xu,Ying Li,Hamed Alsulami,Mohammed Sh Alhodaly,Tasawar Hayat,Yubing Sun
A new photocatalyst of TiO 2 /C 3 N 4 composite (TiO 2 /g-C 3 N 4 ) was synthesized by the hydrothermal method. The characterization showed that TiO 2 /g-C 3 N 4 extended absorption light range and enhanced generation efficiency of photo-induced electron. Under the simulated solar irradiation, the photodegradation rate of bisphenol A (BPA) by TiO 2 /g-C 3 N 4 was twice as fast as that of g-C 3 N 4 . Furthermore, TiO 2 /g-C 3 N 4 presented the good stability and excellent selectivity for BPA degradation. The high degradation rate of BPA by TiO 2 /g-C 3 N 4 was demonstrated to be superoxide radical (·O 2 − ) and singlet oxygen ( 1 O 2 ) by radical quenching experiment, which was further evidenced by EPR, XPS, DRS and PL analysis. These findings revealed that TiO 2 /g-C 3 N 4 can be used as a potential photocatalyst for removing organic pollutants in actual environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
RSC Advances
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2022
·Vol. 12
·期 17
·10258-10266
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IF 4.036
Jing Liu,Jinxiao Zheng,Guichu Yue,Huaike Li,Zhaoyue Liu,Yong Zhao,Nü Wang,Chenghua Sun,Zhimin Cui
TiO2/g-C3N4 composite photocatalysts with various merits, including low-cost, non-toxic, and environment friendliness, have potential application for producing clean energy and removing organic pollutants to deal with the global energy shortage and environmental contamination. Coating a continuous g-C3N4 layer on TiO2 fibers to form a core/shell structure that could improve the separation and transit efficiency of photo-induced carriers in photocatalytic reactions is still a challenge. In this work, porous TiO2 (P-TiO2)@g-C3N4 fibers were prepared by a hard template-assisted electrospinning method together with the g-C3N4 precursor in an immersing and calcination process. The continuous g-C3N4 layer was fully packed around the P-TiO2 fibers tightly to form a TiO2@g-C3N4 core/shell composite with a strong TiO2/g-C3N4 heterojunction, which greatly enhanced the separation efficiency of photo-induced electrons and holes. Moreover, the great length–diameter ratio configuration of the fiber catalyst was favorable for the recycling of the catalyst. The P-TiO2@g-C3N4 core/shell composite exhibited a significantly enhanced photocatalytic performance both in H2 generation and dye degradation reactions under visible light irradiation, owing to the specific P-TiO2@g-C3N4 core/shell structure and the high-quality TiO2/g-C3N4 heterojunction in the photocatalyst. This work offers a promising strategy to produce photocatalysts with high efficiency in visible light through a rational structure design.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Lv,Lili Lu,Xuefan Feng,Xiaoping Wu,Xiaoming Wang,Xiong Zou,Fuqin Zhang
Photocatalysis is one of the most promising ways to realize artificial photosynthesis. The biologically inspired photocatalysts with 3D flower-like structures have attracted much attention. In this study, an effective method for the synthesis of composite photocatalytic material, NH 4 TiOF 3 /TiO 2 /g-C 3 N 4 , with a 3D camellia-like structure, was developed. The 3D hierarchical structure of the composite material enabled multiple refractions and reflections of light within the catalyst, which greatly improved the efficiency of the sunlight harvesting. The combination of NH 4 TiOF 3 and TiO 2 also effectively reduced the electron-hole recombination in the g-C 3 N 4 . To evaluate its photocatalytic performance, the prepared nanostructured composite materials were tested for the water-splitting with simulated sunlight. It showed the hydrogen evolution at the rate of 3.6 mmol/g/h, which is 4.0 times faster than that from the pure g-C 3 N 4 . The composite materials exhibited excellent cycling stability. The detailed mechanism of the Z-scheme heterojunction was also discussed. The proposed synthesis route for the creation of 3D flower-like hierarchical composites provides a new effective technique for developing efficient, active, and stable composite photocatalysts for hydrogen production.
研究领域:
材料科学
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能源化学
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光催化
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Songyu Yang,Kailin Wang,Qiao Chen,Yan Wu
S-scheme heterostructure photocatalysts can achieve highly efficient solar energy utilization. Here, single-atom Ni species were deposited onto TiO 2 /g-C 3 N 4 (TCN) composite photocatalyst with an S-scheme heterojunction for highly efficient photocatalytic water splitting to produce hydrogen. Under solar irradiation, it realized the hydrogen production activity of 134 µmol g –1 h –1 , about 5 times higher than the TCN without atomic Ni. In-situ Kelvin probe force microscopy characterization and the density functional calculation certify that by forming the S-scheme heterojunction, the photo-excited electrons from the TiO 2 combine with the photogenerated holes at the coupled g-C 3 N 4 driven by a built-in electric field. More importantly, the single-atom Ni species stabilized the photogenerated electrons from the g-C 3 N 4 could effectively enhance the charge separation between the holes on the valence band of TiO 2 and electrons at the conduction band of g-C 3 N 4 . Meanwhile, the Ni atoms act as the surface catalytic centers for the water reduction reaction, which greatly improves the reactivity of the photocatalyst. The present work provides a new approach for developing noble metal-free heterojunctions for high-efficiency photocatalysis.
研究领域:
材料科学
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能源化学
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催化科学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 10
·3486-3495
·
IF 4.052
Juying Lei,Bin Chen,Weijia Lv,Liang Zhou,Lingzhi Wang,Yongdi Liu,Jinlong Zhang
A TiO2/g-C3N4 composite photocatalyst with an inverse opal structure and heterojunction has been successfully prepared by a relatively facile approach. The catalyst was characterized by a combination of XRD, SEM, HRTEM, XPS, PL, EIS and DRS techniques and applied for the photocatalytic degradation of organic pollutants represented by Rhodamine B, phenol and levofloxacin. The results of RhB degradation showed that the rate constant of inverse opal TiO2/g-C3N4 with the best compound ratio is 0.184 min−1, which is 2.7 times faster than that of normal TiO2/g-C3N4 and 4.2 times faster than that of inverse opal TiO2. The enhancement of photocatalytic activity may be attributed to the matched overlapping band structure and the interaction between inverse opal g-C3N4 and TiO2. The inverse opal structure of g-C3N4 has improved the optical absorption properties of g-C3N4 and the interaction between inverse opal g-C3N4 and TiO2 creates more interfaces for the efficient transfer of photogenerated electron–hole pairs to restrict the recombination, which was proved from the photoluminescence spectra (PL). Moreover, a possible photocatalytic mechanism has been tentatively proposed according to the experimental results. All in all, both the inverse opal structure and heterojunction construction play significant roles in the excellent photocatalytic degradation performance according to the mechanism investigation.
研究领域:
材料科学
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环境科学
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光催化
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 10
·1-14
·
IF 2.9
Jiang Huize,Yang Jinge,Wang Xinxin,Wang Aihong,li Yuzhi,Wang Jinyu
The massive use of acetaminophen (APAP) poses a potential crisis for humans and the environment. In this paper, the degradation of APAP in aqueous solution was carried out using photocatalytic synergistic persulfate oxidation. To enhance the photocatalytic activity of g-C 3 N 4 and thus activate the persulfate (K 2 S 2 O 8 , PS) more effectively, the heterojunction photocatalyst TiO 2 /g-C 3 N 4 (TCN) was prepared by a hydrothermal method. The TCN-PS catalytic system showed a high efficiency for APAP degradation. When the amount of TCN and PS added was 0.6 g/L, the degradation rate of APAP at 10 mg/L was 78.3% after 60 min of illumination. Moreover, the TCN-PS catalytic system was effective in removing organic pollutants in acidic, neutral, and weakly alkaline environments. The radical quenching experiment results indicate that both sulfate radicals (SO 4 − •) and hydroxyl radicals (•OH) are involved in the degradation reaction. After five cycles, the TCN-PS catalytic system still has stable catalytic activity.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
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
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）