APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lianying Lu,Guohong Wang,Min Zou,Juan Wang,Jun Li
Hierarchical TiO 2 /g-C 3 N 4 heterojunction photocatalysts with well-defined multiscale porous TiO 2 framework are synthesized by simply calcinating tetrabutyl titanate and melamine precursors. The samples have been characterized by XRD, XPS, SEM, TEM, FTIR, nitrogen absorption-desorption equipment and TGA. The photocatalytic activity of these samples has been investigated in photo-degradation of Rhodamine B (RhB). The results show that calcining temperature critically affects the microstructure, surface area, interface structure and catalytic properties of the prepared samples. At the optimal calcining temperature of 550 °C, the apparent reaction rate constant of the catalyst is 55.0 × 10 −3 min −1 , which is 16.2 fold of pure TiO 2 (3.4 × 10 −3 min −1 ) and 3.4 fold of pure g-C 3 N 4 (16.4 × 10 −3 min −1 ), respectively. The strengthened visible-light-driven photocatalytic activity is attributed to the formation of a unique Z-scheme TiO 2 /g-C 3 N 4 heterojunction due to C- or N-doping at the surface of the porous TiO 2 framework. This mechanism explains the observation in a series of radical trapping experiments that superoxide ions and photo-generated holes play major roles in the photo-decolorizing process while hydroxyl radicals are also involved with a minor role.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yanyan Wang,Xin Ding,Ping Zhang,Qi Wang,Kang Zheng,Lin Chen,Jianjun Ding,Xingyou Tian,Xian Zhang
In this work, a TiO2/g-C3N4 photocatalytic coating is built on cotton fabrics with a simple layer-by-layer (LBL) self-assembly strategy in which TiO2 and g-C3N4 are alternately assembled on cotton fabrics via electrostatic attraction. The fabrics, as support, disperse TiO2/g-C3N4 powder photocatalyst to expose more active sites. The fabrics also act as an adsorbent to boost the pollutants capture. Consequently, the coated fabrics exhibit an outstanding photocatalytic property applicable for degradation of both liquid rhodamine (RhB) and gaseous toluene pollutants. The fabric with seven bilayer coatings shows the best for RhB decomposition with degradation rate of 92.5%. Over 90% toluene could be eliminated by the photocatalytic coating under simulated sunlight irradiation. Besides, the coating fabrics show excellent stability and reusability.
研究领域:
材料科学
·
环境科学
✓ 已验证
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
·
催化
·
环境化学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xinyu Du,Xue Bai,Lu Xu,Lei Yang,Pengkang Jin
A novel TiO 2 /g-C 3 N 4 -PS system was proposed, in which a TiO 2 /g-C 3 N 4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO 2 /g-C 3 N 4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO 2 /g-C 3 N 4 -PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation . The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO 2 /g-C 3 N 4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO 2 /g-C 3 N 4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO 4 − , OH and h + all contribute to eliminating organic compounds. Additionally, the TiO 2 /g-C 3 N 4 -PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol , bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO 2 /g-C 3 N 4 -PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants.
研究领域:
环境科学
·
化学
·
材料科学
·
水处理
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 47
·22123-22132
·
IF 3.591
Jing Liu,Dianming Li,Xiaofeng Liu,Jie Zhou,Hong Zhao,Nü Wang,Zhimin Cui,Jie Bai,Yong Zhao
Hydrogen evolution and dye degradation catalyzed by environmentally benign and inexpensive photocatalyst in aqueous solution is regarded as a promising avenue to effectively address the global energy and environmental crisis. It is difficult for traditional photocatalysts to perform efficient light harvesting, with conducive recycling and promoted charge separation and transport, which limit practical applications in photocatalytic conversion. In this study, a facile template-assisted coaxial electrospinning approach was explored to successfully build close contacted heterojunctions within the interface of g-C3N4 nanosheets and hollow porous TiO2 nanofibers, which significantly increased the separation efficiency of photo-induced electron–hole pairs in the visible-light region. A hollow and porous structure with abundant surface-active sites assisted in inducing multiple light reflection for more efficient light harvesting. Moreover, one dimensional TiO2/g-C3N4 composite nanofibers with a large length-to-diameter ratio would be more attractive for recovery. At the optimal g-C3N4 loading, hollow porous TiO2/g-C3N4-50% nanofibers exhibited the highest rate of hydrogen evolution and RhB degradation. The enhanced photocatalytic performance of hollow porous TiO2/g-C3N4 composite photocatalysts was mainly attributed to the synergistic effect of the hollow porous architecture and heterojunction. This work might make a significant contribution to insight into preparing hollow structure heterogenous nanofiber photocatalysts with improved activities in hydrogen generation and pollutant degradation.
研究领域:
材料科学
·
环境科学
·
化学
·
能源
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Pin Chen,Siyuan Di,Xiaoqing Qiu,Shukui Zhu
In order to achieve excellent visible light photoactivity of TiO 2 , it is still urgently required to extend their optical absorption ability and improve the potential of charge separation and migration. Here we synthesized highly efficient visible-light-active catalysts F-TiO 2 /g-C 3 N 4 via a one-step-calcination method. Due to the synergic effect of ≡Ti−F, ≡Ti:F−H and the heterojunction, the obtained catalysts possess promising properties as highly efficient separation and migration of photoelectron-hole pairs. The prepared F-TiO 2 /g-C 3 N 4 heterojunction can be successfully applied to degrade the widely used flame retardants and antibiotics. More than 95% of tetrabromobisphenol A (TBBPA) was decomposed after light illumination for 120 min, and 98% of sulfamethazine (SMZ) was degraded for 60 min by F-TiO 2 /g-C 3 N 4 . Furthermore, a reasonable catalytic mechanism for the F-TiO 2 /g-C 3 N 4 catalysts was proposed. It could be seen that the active species •O 2 − , •OH, and h + played important roles in the photocatalytic process under visible light illumination.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 7
·7025-7039
·
IF 2.914
Gao Boru,Wang Jin,Dou Mengmeng,Xu Ce,Huang Xue
In present study, an efficient ternary Ag/TiO 2 /mesoporous g-C 3 N 4 (M-g-C 3 N 4 ) photocatalyst was successfully synthesized through depositing Ag nanoparticles (NPs) on the surface of TiO 2 /M-g-C 3 N 4 heterojunction. Ag/TiO 2 /M-g-C 3 N 4 nanocomposite displayed the highest degradation efficiency for amoxicillin (AMX) compared to TiO 2 /M-g-C 3 N 4 heterojunction, M-g-C 3 N 4 , and bulk-g-C 3 N 4 (B-g-C 3 N 4 ). The removal efficiency of AMX in real situation, surface water (SW), hospital wastewater (HW), and waste water treatment plant (WWTP) also were studied to illustrate the effectiveness of Ag/TiO 2 /M-g-C 3 N 4 photocatalysts. The vulnerable atoms in AMX structure were revealed through DFT calculation. Additionally, the dominating active groups produced in time of the photocatalytic procedure were determined on account of free radical trapping experiments and ESR spectra. The mechanism of photocatalytic degradation was proposed and verified. The transfer of the electrons and the inhibition of the recombination of photogenerated electron-holes were enhanced effectively under the synergistic effect of the Ag NPs and TiO 2 . As a consequence, the catalytic activity of the composite was improved under visible light.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2026
·Vol. 48
·期 12
·509
·
IF 4.3
Abudureyimu Mukaidasi,Chen Xi,Zhu Xiaoxuan,Huang Yu,Wang Yehui
Naphthalene, as a representative polycyclic aromatic hydrocarbon (PAH), is persistent, bioaccumulative, and toxic, posing a long-term threat to aquatic environments. To address this issue, a mineral-mediated Au-TiO 2 /g-C 3 N 4 composite photocatalyst with coupled adsorption and photocatalytic functions was constructed through photodeposition, co-pyrolysis, and subsequent in situ mineral loading/calcination. Characterization analyses demonstrated that 1.0 wt% Au provided the most effective electronic modulation, giving an apparent rate constant of 0.174 min −1 for naphthalene degradation, which was 3.78 times that of the Au-free counterpart. Among the tested mineral supports, bentonite exhibited the strongest adsorption-enrichment effect, increasing the adsorption efficiency to 47.2% and enabling complete removal and near-complete mineralization of naphthalene within 25 min of irradiation. Radical trapping experiments and ESR spectra identified ·OH, ·O 2 − , and h + as the dominant reactive species. Combined with Gas Chromatography-Mass Spectrometry (GC-MS) and in situ Gas Chromatography (GC) analyses, naphthalene was found to undergo progressive hydroxylation, ring opening, and oxidation before final mineralization. This work provides a feasible strategy for designing mineral-semiconductor composite photocatalysts for efficient PAH removal from water.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Shenglei Feng,Miaomiao Zhu,Yu Ning,Huisen Dong,Hanshuo Wei,Xiaoying Liang,Jielu Zhu
To overcome the issues of difficult dispersion and recovery of powdered photocatalytic catalysts and secondary pollution, a double-sided adhesive loaded with TiO2/g-C3N4 photocatalytic material was prepared by a brushing method. The photocatalytic double-sided adhesive (PDSA) was analyzed by scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), contact angle analysis, ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and fluorescence spectroscopy (PL). The degradation of Rhodamine B (RhB) was used to evaluate the photocatalytic performance of the PDSA. The best degradation of 96.96% after 2 h illumination and ultrasound treatment was achieved when the conditions were 10 mg L−1 RhB solution, 10 mL, 25 °C and pH = 7. Quenching agent experiments determined that ˙O2− and ˙OH were the main active species. The effect of impurity ions and soaking in acidic/alkaline solution on PDSA degradation was evaluated. After 5 cycles of degradation experiments, the degradation efficiency of PDSA was still up to 96.55%. This study provides a new solution for the loading of powdered photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Ning Li,Yihui Qi,Shujie Zang,Tingna Shao,Jiaojiao Gao,Lina Lin,Yu Zhao
A novel TiO 2 –g-C 3 N 4 –BiOI (TCB) dual-heterojunction nanocomposite with a hierarchical nanoflower morphology was synthesized via a combined hydrothermal–calcination method. The TCB-2 sample, which contained 2.4% Bi, exhibited exceptional photocatalytic activity for methyl orange degradation, achieving 98.55% removal under xenon-lamp irradiation within 100 min. SEM characterization revealed a nanoflower architecture composed of interlaced nanosheets with abundant interspaces, providing increased active sites and facilitating reactant diffusion. UV–Vis DRS analysis confirmed the narrowed optical band gap and extended visible-light absorption range. The formation of intimate contact between components, which is a prerequisite for heterojunctions, was supported by XRD and XPS analyses, suggesting the possible establishment of dual heterojunctions (Type II and p-n). The catalyst maintained an 82.80% degradation efficiency after three cycles, demonstrating excellent stability. This work provides valuable insights for designing TiO 2 -based photocatalysts with enhanced visible-light utilization for environmental applications.
✓ 已验证
DOI
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
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Huihui Zhu,Xiaoju Yang,Min Zhang,Qiuye Li,Jianjun Yang
Constructing two-dimensional (2D) heterostructure is an effective method to obtain highly efficient photocatalysts. In this work, 2D/2D TiO 2 /g-C 3 N 4 heterostructures were constructed via in-situ growth of TiO 2 nanosheets on the surface of g-C 3 N 4 nanosheets by a facile hydrothermal co-assembly technique. The increased dispersion is favorable to expose more vacancies, which is beneficial to the enhancement of visible light absorption. This unique 2D/2D heterostructure exhibits ultrathin thickness and larger interfacial contact area, which results in shorter migration distance of photo-generated carriers to the surface and faster participation in photocatalytic water splitting. As expected, the optimized TiO 2 /g-C 3 N 4 nanocomposites showed a higher photocatalytic hydrogen evolution performance under visible light irradiation than that of pristine g-C 3 N 4 and TiO 2 nanosheets. The improved performance can be attributed to the ultrathin nanosheet structure, the intimate interfacial contact and the presence of surface oxygen vacancies. More appealingly, this environment-friendly 2D/2D TiO 2 /g-C 3 N 4 nanohybrid would attract more attention in water splitting.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能量转换
·
环境技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）