CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Feihong Wang,Qi Zhao,Hongpeng Li,Qiangshun Wu,Luyan Zhang,Yan Li,Liang Qiao,Ye Yuan,Jun Ma,Panpan Wang,Tianming Chen
Chlorophenolic pollutants pose serious threats to the aquatic ecosystem. Photocatalysis technology has broad prospects for decontamination. In this work, MXene-derived TiO 2 nanocomposites with mixed-crystal characteristics and oxygen vacancies (OVs) (E–TiO 2 @rGO) were successfully synthesized by atmosphere modulation. Compared with commercial TiO 2 and N 2 –TiO 2 @rGO (anatase phase), the rate constants of E–TiO 2 @rGO (0.06874 min −1 ) over 2,4,6-trichlorophenol (2,4,6-TCP) degradation increased 4 and 1.3 times, respectively. The enhanced photocatalytic performance was attributed to the co-existence of anatase and rutile phases. On the one hand, the mixed-crystal phase narrowed the band gap, broadening the light absorption range. On the other hand, it induced the generation of OVs, which has been demonstrated by DFT calculation. The presence of OVs improved the adsorption and activation of O 2 and H 2 O molecules, beneficial for the formation of active free radicals. In addition, the incorporation of rGO promoted the separation of electron-hole pairs. The Gibbs free energy of 2,4,6-TCP degradation revealed that the OVs and mixed-crystal could reduce the energy barrier of the rate-determining step, thereby boosting the dichlorination efficiency of 2,4,6-TCP. The superoxide free radical ( O 2 − ) was determined as the dominant active species. Finally, a possible mechanism of 2,4,6-TCP degradation with E–TiO 2 @rGO was clarified clearly. The proposed mixed-crystal defect engineering represents a novel strategy in the design and synthesis of photocatalysts.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Renhua Zheng,YingHong Huang,Beiqing Wang,DiWen Jia,Jingle Chen,Haichang Guo,Ting Wang
To enhance the removal efficiency of refractory organic pollutants in high-salinity wastewater, three types of advanced oxidation processes (AOPs), i.e., photocatalysis, Fenton catalysis, and photocatalysis coupled with Fenton catalysis, were used to degrade tetracycline (TC) and rhodamine B (RhB) in sodium sulfate solution (15 %). Different Fe-doped TiO 2 -loaded reduced graphene oxide materials prepared by adsorption-layer nanoreactor synthesis were employed as catalysts in AOPs. The differences in the mechanism of the three types of AOPs for TC and RhB degradation were explored. The results showed that Fe doping can improve the degradation performance of catalysts in these AOPs, both in freshwater and saline water. Salt ions strongly inhibited pollutant degradation in both the photocatalytic degradation and Fenton catalysis process. The synergistic photocatalytic Fenton system can resist the interference of salt ions, thus effectively degrading both TC and RhB. The removal rates of TC and RhB reached 75.21 % and 84.11 % in 3 h, respectively. In the combined photocatalytic Fenton system, the active species were mainly photogenerated holes (h + ), but some ·OH and ·O 2 − radicals also participated in the decomposition of pollutants. For the two molecules, density functional theory calculations revealed the different atomic sites that were attacked by h + and ·OH. Salt ions surrounded electrophilic atoms with large f − values in the molecule, thus hindering the h + attack on these atoms. In contrast, salt ions did not affect the atom with the largest f 0 . More h + and ·OH were generated in the photocatalytic Fenton system, effectively reducing the interference of salt ions with pollutant degradation.
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TALANTA
·
2024
·
IF 5.6
Lvhong Gong,Shengxi Wu,Junjie Liu,Mingjun Zhang,Jinghao Zhuang,Doudou Xu
An ultrasensitive immunosensor of Cys/Au@TiO 2 based on disposable screen-printed electrodes (SPE) for PIVKA-II detection for hepatocellular carcinoma (HCC) diagnosis was developed by utilizing Cystine (Cys) and nanocomposite Au@TiO 2 . Firstly, HAuCl 4 underwent a reduction reaction with NaBH 4 , then Au nanoparticles were coated onto TiO 2 nanoparticles. Followed, Cys/Au@TiO 2 was formed through self-assembly of cysteine to allow the monoclonal antibody of abnormal thrombospondin to bound to the amino group on the surface of the composite by covalent bonding. The mechanism is to determine the changes in the current of the sensor caused by the specific binding of the abnormal prothrombin monoclonal antibody adsorbed by the complex with its antigen. The Cys/Au@TiO 2 immunosensor was fully characterized by various analytical approaches and it showed a wide linear testing range of 1–10000 pg mL −1 (R 2 = 0.991) and the limit of detection down to 0.77 pg ml −1 , with highly sensitivity and specificity. The results showed that the developed immunosensor platform can effectively detect trace amounts of PIVKA-II protein and has potent clinical application for HCC diagnosis.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Tianxing Fang,Qingyi Wei,Erwen Wu,Hongbin Pu
Malachite green (MG)-contaminated aquatic products pose a serious threat to animal and human health. Hence, a novel recyclable surface-enhanced Raman scattering (SERS) substrate based on AuNPs/TiO 2 /Ti 3 C 2 heterostructures was developed for the detection and degradation of MG in aquatic products. Specifically, AuNPs/TiO 2 /Ti 3 C 2 heterostructures were synthesized by in situ oxidation and electrostatic adsorption based on Ti 3 C 2 nanosheets. The excellent photocatalytic and SERS performance of the AuNPs/TiO 2 /Ti 3 C 2 was demonstrated by Density functional theory (DFT) calculations and experimental results, which was attributed to the enhancement of charge transfer (CT) after the formation of heterostructures. The results demonstrate that AuNPs/TiO 2 /Ti 3 C 2 is highly sensitive and recyclable. The detection limit of the sensor for MG is 8.91 × 10 −5 mg/L. The sensor can be recycled for five times under the condition of light, and shows satisfactory self-cleaning performance in the food matrix, providing a possible alternative solution for the recyclable detection of MG.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ruiui Hao,Kaijia Zhang,Guohong Wang
Developing a low-cost, stable but efficient heterojunction photocatalyst is very crucial and challenging. A multivalent TiO 2 @Cu 3 (BTC) 2 heterojunction photocatalyst with active copper center has been prepared by a simple solvothermal method. In the photocatalytic process, photogenerated electrons produced by TiO 2 are transferred to the copper center in Cu 3 (BTC) 2 , partially reducing Cu 2+ and forming a highly active Cu 2+ /Cu + mixed center. This electron transfer path effectively increases the carrier density and prolongs the lifetime of the photogenerated charge. Under the optimal composite ratio, the hydrogen production activity of the TiO 2 @Cu 3 (BTC) 2 heterojunction photocatalyst was significantly enhanced, exceeding that of TiO 2 (8.39 μmol·g −1 ·h −1 ) by a factor of 72.2 times, and overcoming the barrier of no hydrogen production activity in pure Cu 3 (BTC) 2 . Additionally, the heterojunction photocatalyst demonstrated excellent chemical and photocatalytic stability over a period of at least 200 days. The enhanced photocatalytic activity is attributed to the improved visible light absorption efficiency, the effective heterojunction interfaces, particularly the highly active Cu 2+ /Cu + mixed center formed. Importantly, noble metal was not used in the photocatalytic hydrogen production process. Instead, Cu 2+ /Cu + were employed as active centers, making it possible to synthesize low-cost photocatalysts. This work provides conceptual guidance for the development of highly efficient multivalent TiO 2 -based heterojunction photocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Siyu Qiang,Sijuan Zeng,Hualei Liu,Jin Dai,Shuyu Liu,Yihe Yin,Fei Wang,Jianyong Yu,Yi-Tao Liu,Bin Ding
In light of the high energy consumption and substantial carbon emissions associated with traditional NH 3 production based on the Haber–Bosch process, the aqueous electrochemical nitrogen reduction reaction (NRR) offers a clean and sustainable alternative production route. Nevertheless, activating the N N bonds at room temperature is challenging due to the high bond energy, severely hindering the development and commercialization of the electrochemical NRR. Herein, we report a synergistic strategy for achieving efficient N 2 activation at ambient conditions that combines electrolyte engineering with catalytic site-modulated TiO 2−x nanofiber electrocatalysts. The synthesized TiO 2−x nanofiber electrocatalysts contained abundant intrinsic oxygen vacancies and were further modified with hydroxyl groups to create electron-rich Lewis acidic Ti sites. Additionally, BF 3 was engineered into the electrolyte microenvironment, and it could form adducts with N 2 , serving as a dynamic carrier for N 2 transport. The electron-rich Lewis acidic sites and the dynamic carriers exerted a ‘pull–pull’ effect on N 2 , thereby weakening the N N bonds. Through electrochemical performance evaluation, the designed electrocatalytic scheme achieved an NH 3 yield of ∼57.15 μg h −1 mg −1 and a Faradaic efficiency of ∼15.14 %. We anticipate that this methodology will provide new insights into the development of electrochemical ammonia synthesis, particularly in relation to multifaceted design.
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JOURNAL OF CATALYSIS
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2025
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IF 6.5
Cailing Wu,Mingming Sun,Xinyang Gao,Qifei Huang,Zhaojun Min,Yanxing Zhang,Jianji Wang
Single atom catalysts (SACs) supported on metal oxide are usually prepared at high temperature, high pressure, and complex process. Herein, a new strategy is developed to prepare SACs anchored on vacancy-rich TiO 2 using Ti 2 O 3 as the support precursor under mild conditions, where Ti 3+ on Ti 2 O 3 surface acts as “traps” to capture and then reduce metal ions through electron transfer without using reducing agents. This approach is universally applicable for different single metal atoms supported on diverse phases of TiO 2 (anatase, rutile, metastable and mixed counterpart). The as-obtained Pt 1 /TiO 2 with controllable Pt loading and multiple oxygen vacancies (Ov) exhibits excellent activity in photocatalytic H 2 evolution. At optimal conditions, the H 2 evolution rate is up to 95,180 μmol g −1 h −1 , which is the highest for TiO 2 supported SACs reported.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Shiva Pandeya,Rui Ding,Qianqian Shang,Xueqing Zhu,Yufei Ma,Xuling Han,Meixing Gui,Narayan Bhattarai,Ziliang Li,Mahesh Kumar Joshi
This study aims to develop a reusable, self-supporting Ag 2 S/TiO 2 photocatalyst for the degradation of tetracycline hydrochloride (TCH) and chemical oxygen demand (COD) removal under visible light irradiation. The flexible Ag 2 S/TiO 2 nanofibrous membranes (NFMs) were prepared by electrospinning and subsequent calcination followed by the deposition of Ag 2 S quantum dots (QDs) on TiO 2 nanofibers by the successive ionic layer adsorption and reaction (SILAR) method. The precise deposition of Ag 2 S QDs preserved the self-standing properties of TiO 2 NFM, and the amount of Ag 2 S QDs was regulated by altering precursor concentration while keeping the SILAR cycles constant. The SEM-EDX, XPS, TEM, and PL measurements confirmed the formation of an Ag 2 S/TiO 2 heterojunction, which lowered the band gap energy to 2.68 eV. This band gap engineering reduced the electron-hole pair recombination and accelerated TCH degradation and COD removal under visible light. The photocatalytic degradation of TCH obeyed pseudo-first-order reaction dynamics, showing a strong influence of the Ag 2 S amount and the pH of the TCH solution on degradation. The Ag 2 S/TiO 2 heterojunction exhibited superior photocatalytic degradation, achieving up to 85.6 % in 90 min, compared to 66.6 % for TiO 2 NFM. The TCH degradation rate significantly increased from 0.012 min⁻¹ for TiO 2 NFM to 0.029 min⁻¹ for Ag 2 S/TiO 2 NFM, marking a 2.4-fold improvement. Furthermore, the optimal TCH degradation occurred at neutral pH 7, while COD removal (94.2 %) from pharmaceutical samples was most effective at acidic pH 5, demonstrating the significant influence of pH on photocatalytic pollutant removal. The as-prepared Ag 2 S/TiO 2 NFM demonstrated strong recyclability, retaining high efficiency after five cycles of use, while maintaining its self-supporting properties, allowing for easy separation after application.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.2
Mao Xiqiang,Zou Sujing,Lu Xue,Li Shaoyi,Wu Lei,Li Jun,Yang Jian,Fan Ximei
Photocatalysis technology has garnered significant attentions for addressing water pollution issues, however, conventional photocatalysts face great challenges such as poor recoverability, low light utilization rates, and severe caking that hinder their widespread use. This study presents the development of floating Bi 2 O 3 /TiO 2 /HGM (BTH) photocatalysts utilizing hollow glass microspheres (HGM) as a supporting material. The optimized heterojunction of BTH-0.3 achieves an 83.9% removal rate of tetracycline hydrochloride within 60 min irradiation under simulated sunlight, surpassing the 77.3% achieved by TH-2 loaded with only TiO 2 and the 62% achieved by pure Bi 2 O 3 . Furthermore, BTH-0.3 exhibits outstanding photocatalytic performance across varying solution pH levels and diverse water matrices. Moreover, consistent tetracycline hydrochloride removal rates were observed over four consecutive degradation cycles, demonstrating its excellent reusability. This research offers a promising approach with practical potential for addressing water pollution challenges via photocatalytic technology.
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RSC Advances
·
2024
·Vol. 14
·期 8
·4975-4989
·
IF 3.9
Jianrou Li,Zhuangzhuang Yin,Jun Guo,Wei Gan,Ruixin Chen,Miao Zhang,Zhaoqi Sun
In this study, Sb2S3/In2S3/TiO2 (SIT) heterojunction photocatalysts were prepared by a simple two-step hydrothermal method and applied to the photocatalytic degradation of levofloxacin (LEV). After 160 min of reaction under visible light, the SIT heterojunction photocatalyst degraded 10 mg L−1 LEV at a rate of 86.7%. The degradation of LEV follows pseudo-first-order kinetics with a rate constant 1.16 × 10−2 min−1, which is 1.42, 1.22 and 1.05 times higher than that of TiO2, SI and IT, respectively. Meanwhile, the SIT photocatalysts also showed high photocatalytic activity for other antibiotics. The enhanced photocatalytic activity of the ternary heterostructures was attributed to the full-spectrum response and the synergistic effect of the dual Z-type heterojunctions, which improved the visible light absorption and facilitated the charge separation. In addition, ˙OH and ˙O2− play a dominant role in the photodegradation process. This work contributes to the design of novel photocatalytic materials with dual Z-type heterojunctions and efficient photocatalysts for the degradation of antibiotics.
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JOURNAL OF POWER SOURCES
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2012
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IF 4.951
Wei-Wei Cui,Dong-Yan Tang,Zai-Lin Gong
An organic/inorganic hybrid nanocomposite , poly(methyl methacrylate) grafted titanium dioxide (PMMA- g -TiO 2 ), is synthesized by atom transfer radical polymerization (ATRP). The hybrid nanocomposites are incorporated into poly(vinylidene fluoride) (PVdF) membranes during the electrospinning process to fabricate a composite nanofibrous membrane. Then the resultant fibrous polymer electrolyte is obtained by immersing the composite membrane into liquid electrolyte . FTIR , TEM , TGA , GPC , SEM, XRD , and DSC are used to characterize the structure, morphology and thermal properties of PMMA- g -TiO 2 hybrid nanocomposite and the composite nanofibrous membrane. The composite nanofibrous membrane is proven to be a good absorbent for the liquid electrolyte, and it exhibits a high electrolyte uptake and a high electrolyte retention ratio. The incorporation of PMMA- g -TiO 2 into the nanofibrous membrane inhibits the crystallization of PVdF during the solidification process and improves the ionic conductivity of the fibrous polymer electrolyte from 2.51 × 10 −3 to 2.95 × 10 −3 S cm −1 at 20 °C. The electrochemical stability window of the polymer electrolyte is also enhanced due to the presence of PMMA- g -TiO 2 .
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Bo Sun,Yu Tian,Menglin Feng,Sihan Zhang,Hong Yang,Junmei Qin,Wenlong Bi,Xingxing Qiao,Fenwu Liu,Qingjie Hou
Flocculation is often used for the preliminary treatment of wastewater. However, pollutants especially some emerging contaminants, cannot be completely removed in this process. Meanwhile, the flocculated sludge may cause secondary pollution to the environment. This study investigates producing functional sludge biochar (FBC) from flocculated sludge obtained in the initial wastewater treatment phase, then introducing functional elements (Fe 3+ , Cu 2+ , Zn 2+ , and N) derived from flocculated sludge to modified waxberry-shaped TiO 2 photocatalyst. The next step involved using FBC/TiO 2 with functional elements for the deep degradation of swine wastewater. Under simulated sunlight, FBC/TiO 2 demonstrated a COD removal efficiency is 51.35 %, which is 2.65 times greater than that of pure TiO 2 . Furthermore, FBC/TiO 2 showed enhanced removal of dissolved organic matter (fulvic-like acids and soluble microbial products) and biotoxic substances from wastewater under both sunlight and visible light, particularly exhibiting significant efficacy in the removal of hard-degradation humic-like acids. In the photocatalytic process, water molecules oxidation by h + generates •OH, the primary reactive oxygen species responsible for organic matter degradation in wastewater. Applying this process to prepare FBC 15 /TiO 2 can lower sludge treatment costs for wastewater treatment plants while generating a profit of 52.28 $·kg −1 . This research offers a win–win solution for treating swine wastewater, promoting sludge reuse, and reducing the cost of TiO 2 deployment, thus presenting a new approach for efficient, cost-effective treatment of livestock and poultry wastewater.
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