SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Dongdong Fan,Meihua Hu,Songyuan Li,Pinghua Chen,Hualin Jiang,Xinman Tu,Xibao Li,Xubiao Luo
The efficient activation of peroxymonosulfate for degrading emerging contaminants has become a focal point in recent decades, emphasizing the development of novel materials and efficient strategies for high-performance degradation. This study explores a spatial confinement strategy, where TiO 2 is confined inside carbon nanotubes with Co 3 O 4 loading outside, is performed to prepare the nano-confined composite TiO 2 -in-CNT/Co 3 O 4 . Norfloxacin is chosen as the primary target pollutant, revealing a degradation rate exceeding 97 % within 30 min. The non-radical 1 O 2 species were confirmed to be generated in nano-confined catalyst, but not observed in the control non-confined catalyst. Additionally, the quantity of original radical active species significantly increases in nano-confined catalyst compared to non-confined catalyst. TiO 2 -in-CNT/Co 3 O 4 has excellent reusability and application universality. Wonderful stability is observed in real water and anti-ion interference experiments, highlighting its robust stability. Experimental and DFT calculation results also demonstrate that the spatial confinement strategy prevents nanoparticle aggregation, accelerates electron transfer efficiency, and promotes the cycling of Co 2+ /Co 3+ electron pairs. This work provides insights into the regulation of confined effects in activating PMS and offers a feasible strategy for the synergistic activation of PMS for water environment remediation through a radical and non-radical mixed mechanism.
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MATERIALS RESEARCH BULLETIN
·
2024
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IF 5.3
Bowen Zhang,Zhiyong Zhao,Fangfang Yu,Diandian Chen,Fei Cheng,Hari Bala,Zhanying Zhang
The CsPbBr 3 perovskite solar cells (PSCs) based on carbon counter electrode (CCE) are promising because of the advantages including fabrication simplicity and excellent stability, but their power conversion efficiencies (PCE) are low due to interfacial carrier recombination as the direct contact of the CsPbBr 3 with electron transport materials (ETM). In this paper, PbTiO 3 shells were grown onto TiO 2 nanorods to form PbTiO 3 -coated TiO 2 scaffold layer via a two-step method. The presence of PbTiO 3 could promote crystallinity of the CsPbBr 3 perovskite film and inhibits interface recombination at the CsPbBr 3 /TiO 2 interface. Consequently, the carbon-based CsPbBr 3 solar cells with PbTiO 3 /TiO 2 scaffold layer achieves a high PCE of 7.28%, demonstrating an increase by 19.9% compared with the devices based on TiO 2 NRs. Moreover, the champion devices exhibited excellent stability in ambient air, with the PCE value remaining at 93% over 28 days.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Tao Xiang,Fang Li,Mingyao Yuan,Zhenxing Zeng,Hong Peng,Hong Xiao,Xiaohui Lu,Yanzong Zhang,Shihuai Deng,Guangshan Zhang,Peng Xu,Tianyao Shen,Xueming Dang,Xiaojing Wang
Ineffective utilization of generated oxidants, such as H 2 O 2 , together with the nonselectivity of •OH, the principal active species, has significantly hindered the growth of discharge plasma in application for wastewater treatment. Herein, the introduction of constructed Fe 2 O 3 /TiO 2 heterojunction to dielectric barrier discharge plasma (DBDP) not only increased oxidant utilization, but also triggered a shift of decisive position of active species from •OH to selective 1 O 2 and O 2 • - towards bisphenol A (BPA) degradation. Experiments and theoretical calculations collectively revealed that the above process was realized under the joint drive of high-energy electrons, photons, and an interfacial electric field in Fe 2 O 3 /TiO 2 heterojunction. Among them, the interfacial electric field facilitated the separation of electron-hole ( e - - h + ) pairs and the transfer of charge to the antibonding orbit for O-O in H 2 O 2 , dissolved O 2 and O 3 absorbed on the metal sites. Such a work offered theoretical guidance for the ongoing growth of discharge plasma at both the macro and micro levels.
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ENVIRONMENTAL POLLUTION
·
2024
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IF 7.6
Lihua Feng,Yuanyuan Lang,Leke Sun,Weihong Shi,Xiangxiang Chen,Yanan Xia,Hengyi Xu,Yang Liu
Titanium dioxide nanoparticles (TiO 2 NPs) are widely used in children’s daily necessities and foods, and their health hazards to children have attracted particular attention. Childhood is a critical time for accelerated bone growth and development. Current studies revealed that TiO 2 NPs exposure causes bone damage in juvenile rats; however, the underlying mechanism is unknown. Ghrelin is a polypeptide hormone that is considered to be a candidate factor for regulating bone growth and development. In this research, 3-week-old juvenile male rats were administered 0, 100 or 200 mg/kg TiO 2 NPs and 50 μg/kg ghrelin for 4 weeks to explore the underlying mechanism of TiO 2 NPs-induced bone damage, and the protective effect of ghrelin. Our results revealed that TiO 2 NPs resulted in decreased synthesis of bone growth-related hormones, disturbed bone metabolism, and destruction of bone structure. Further mechanism studies showed that TiO 2 NPs inhibited Wnt/β-catenin pathway, reduced collagen synthesis, inhibited chondrocyte proliferation and differentiation, promoted chondrocyte apoptosis, and inhibited endochondral osteogenesis, ultimately leading to long bone longitudinal growth retardation and osteoporosis. Ghrelin alleviated the negative effects of TiO 2 NPs-induced bone growth in juvenile rats by upregulating the Wnt/β-catenin signaling pathway. This study provided a reference for the clinical treatment of growth retardation and idiopathic short stature in juvenile children caused by environmental pollutants.
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International Journal of Nanomedicine
·
2024
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IF 6.6
Lixin Xie,Lihua Feng,Xiaomin Tang,Yunping Xu,Hengyi Xu,Yang Liu
Purpose To evaluate the therapeutic effect of oral administration of Lactiplantibacillus plantarum P101 (P101) on skeletal injury in young rats exposed to titanium dioxide nanoparticles (TiO2 NPs), and explore the potential mechanism.Methods Four-week-old male rats were orally administration to TiO2 NPs and supplemented with P101 2 hours later for 4 weeks. The growth and development, food intake, bone metabolism and serum inflammatory markers of the rats were evaluated. Their tibias were observed and evaluated using microcomputed tomography (micro-CT), tartrate-resistant acid phosphatase (TRAP) staining, immunohistochemistry (IHC) and real-time quantitative PCR (RT-qPCR). We observed the tibia growth plate using safranin and fast green staining. 16S rDNA sequence analysis of fecal samples was performed to observe changes in the gut microbiota.Results Our results showed that TiO2 NPs can lead to bone growth inhibition and osteoporosis, induce intestinal flora imbalance, and induce inflammation in young rats. Further mechanistic studies suggested that TiO2 NPs disrupts intestinal flora and increases serum IL-1β levels, which increased the expression of RANKL in bone, thereby enhancing osteoclast differentiation and function, leading to bone loss. Through a P101 supplementation experiment, we found that P101 ameliorated the inflammation and osteoporosis on bone caused by TiO2 NPs.Conclusion This study showed that the mechanism by which P101 alleviates bone damage caused by TiO2 NPs may be through restoring intestinal microbial homeostasis and inhibiting inflammatory response.
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Surfaces and Interfaces
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2024
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IF 5.7
Xiangming Yang,Yan Liu,Yuting Zhong,Hui Chen
Superhydrophobic coatings simultaneously exhibiting high substrate binding, mechanical durability and self-healing properties are of great significance for anti/de-icing applications. In this study, we fabricated a high substrate binding and mechanical durability anti/de-icing superhydrophobic coatings (SL-AP/SPS-SiO 2 ) with self-healing performance by spray-coating a photothermal self-healing organic layers (AP/SPS-SiO 2 ) plasma-sprayed porous Al 2 O 3 –13%TiO 2 underlayer (SL), the resulting soft-hard interlocking structure significantly increased the adhesion strength of the coating to 16.7 ± 0.36 MPa while reducing the ice adhesion strength to 46.5 ± 3.0 kPa. In the as-obtained organic layers, self-stratifying acrylic resin (AR)/20%polymethylsiloxane (PDMS) (AP), not only enhanced the bonding strength with the underlayer but also imparted photothermal self-healing capability to the coating through the action of the photothermal agent (SPS-SiO 2 ). And sodium alginate (SA) guided the self-oxidative polymerization of dopamine (DA) and its deposition on hydrophilic SiO 2 to form a π-π stacked fiber structure photothermal agent (SPS), after hydrophobic SiO 2 modification increased the coating's roughness and photothermal performance. Remarkably, the coating achieved a contact angle of up to 158.4 ± 0.89° and a rolling angle of 3.5 ± 0.89°, maintaining its superhydrophobic properties even after exposure to acid-base immersion and mechanical abrasion. Furthermore, the coating exhibited self-healing capabilities in superhydrophobicity against O 2 plasma etching, with a contact angle recovery rate of up to 98.9% after undergoing 10 cycles of O 2 plasma etching and light exposure. Enhancing mechanical and chemical stability with self-healing capabilities is beneficial for extending the lifespan of superhydrophobic coatings used in anti-/de-icing applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Xia Zhang,Changcheng Yang,Jian Su,Zhi-Hui Xie,Shixiong Hao
The lower specific surface area and limited surface contact between BiOCl and TiO 2 in composite fabricated by hybridization of TiO 2 with BiOCl extremely hinder its catalytic performance. In this work, the area of interface contact between BiOCl and TiO 2 was increased through the mediation of SiO 2 , and a Bi-modified ternary 0D/2D/2D TiO 2 /BiOCl Z-scheme heterojunction photocatalyst with large specific surface area (= 237.83 m 2 g −1 ) and surface plasmon resonance (SPR) effect was constructed in situ by ingeniously utilizing the reduction of carbon species generated during the calcination process. The results show that the COD removal rate of Bi/TBOC-10% for real liquor brewing wastewater (LBW) reaches 90.5% after 10 hours of visible light irradiation, which is 2.6 times and 2.1 times that of TiO 2 and Degussa P25, respectively. The COD removal rate of the composite was reduced only by 8.9% after five cycles of performance test (50 h). Photoluminescence spectroscopy (PL), Transient Photocurrent Response (TPR), Electrochemical Impedance Spectroscopy (EIS) and BET characterization suggest that its excellent photocatalytic activity should be attributed to the Z-scheme heterojunction that broadens the light absorption range while retains strong oxidation-reduction active sites, the SPR effect that facilitates the separation and migration of photogenerated carriers, and high specific surface area of the composite that provides more active sites for the photodegradation reaction.
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Environmental Technology & Innovation
·
2024
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IF 6.7
Cheng Chang,Zitao Li,Saeed Rad,Lei Gan,Junfeng Dai,Asfandyar Shahab
The high demand for water treatment and environmental restoration via advanced oxidation process (AOP) has estimated the increased production of TiO 2 -based materials. Low cost, high transmittance, durability, and thermal stability, make the recycling low-iron crushed glass an excellent candidate for nano TiO 2 film coating via sol-gel process. Besides support selection, the reactor design plays a vital role in the final product's applicability and efficiency. In this work, small pieces (3–6 mm) of recycled low iron crushed glass were deep coated with multiple layers of nano TiO 2 film for photocatalytic degradation of selected contaminants in a new design packed-bed reactor. A multi-chamber packed-bed photocatalytic reactor was set up for efficient BOD degradation under UV light exposure. SEM, XRD, and BET analysis characterized coating characteristics, morphology, phase, and surface area. For film adherence and coating durability, SEM characteristics and durability of TiO 2 photocatalytic activity tests were performed after the second reutilization. Results revealed that the new reactor can achieve 45.81 up to 79.50% BOD 5 reduction after 24 to 48 h of circulation with constant operation, respectively. low iron crushed glass appeared to be a perfect support for TiO 2 film coating with a BET of 0.0742 m 2 /g after 9 cycles of coating. XRD results showed 95–97% anatase phase crystals with an average particle size of 12.97 nm with different rounds of annealing at 550 °C in muffle. Results underpinned that the technique seems promising to be applied on a large scale for pretreated industrial or pharmaceutical wastewater.
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Journal of Water Process Engineering
·
2024
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IF 6.3
Jie Yan,Jin Chen,Xiaofeng Yang,Yueying Wang,Xinle Wang,Jianye Shi,Jing Zhang,Yuzhao Ma,Yanjun Li
The photocatalytic destruction of contaminants in water, such as antibiotics and dyes, has emerged as a hot topic in environmental treatment. The 2D/2D BiOBr/(001)-TiO 2 S-scheme heterojunction , decorated with Pt, was fabricated through in-situ construction and photochemical deposition techniques and utilized to effectively eliminate tetracycline hydrochloride , rhodamine B , and methyl orange. 0.3 wt% has the highest degradation activity when exposed to visible light , and all TC-HCL degradation can be accomplished in 5 min. The photodegradation rate constants of BiOBr and BiOBr/(001)-TiO 2 are 15.3 and 6.3 times higher, respectively. Its satisfactory photocatalytic performance can be attributed to efficient interfacial charge separation, surface plasmon resonance (SPR) effect-induced broadening of the light absorption range, and enhanced migration and separation of photogenerated electron-hole pairs, as well as the formation of an S-scheme heterojunction with strong redox ability. Meanwhile, the larger heterogeneous interface of 2D/2D nanostructures offers efficient charge transfer channels and more reactive sites. Experiments involving electron spin resonance (ESR) and free radical capture demonstrated the generation of not only h + and O 2 − , but also more potent OH radicals. Furthermore, an effective S-scheme heterojunction carrier migration and degradation pathway was proposed based on the experimental results. This study proposes a novel concept for the production of S-scheme heterojunctions photocatalysts that are effective for wastewater pollutant degradation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Jiangwen Xu,Jinxu Song,Haotian Li,Hui Song,Zicong Yang,Yukun Chang,Wenyuan Zhou,Jinshu Wang,Hongyi Li
The chlorine evolution reaction (CER) is essential for chlorine (Cl 2 ) production. However, the catalyst deactivation and side reaction oxygen evolution reaction (OER) are still serious problems for CER. Improving the stability and selectivity of catalyst for long term electrocatalytic reaction in large current density is highly desired. In this work, a self-supporting Ti/RuO 2 @TiO 2 nanotubes (NTs) electrode had been developed by co-sputtering titanium (Ti) and ruthenium oxide (RuO 2 ) onto the high-ordered titanium dioxide (TiO 2 ) nanotubes substrate. This process produced a well-distributed incorporation of Ti species within the RuO 2 coating. It has revealed that the presence of Ti element optimizes the surface morphology of electrode and modulates the electronic state of ruthenium (Ru) species, effectively preventing over-oxidation and thereby enhancing stability. The Ti/RuO 2 @TiO 2 NTs self-supporting electrode exhibits remarkable electrocatalytic activity for CER, evaluated by lower overpotential (58 mV) at 10 mA cm −2 and reduced Tafel slope (78 mV dec −1 ) than that of other electrodes. Moreover, its mass activity achieving 478 mA mg Ru −1 at 1.3 V (vs SCE) is 4.3 times that of commercial dimensionally stable anodes (DSA). After operating for approximately 150 h at 100 mA cm −2 , the electrode exhibits minimal performance degradation, underscoring its exceptional stability. Additionally, the large potential difference between CER and OER makes it maintain high Cl 2 selectivity, achieving up to 91 % across varying current densities and reaction times. This work provides valuable strategy for designing novel Ru-based catalysts for practical CER applications in seawater and industrial environments.
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NEW JOURNAL OF CHEMISTRY
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2025
·Vol. 49
·期 9
·3526-3535
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IF 2.5
Shuang Meng,Yan Zhuang,Xue Yang,Dongxuan Guo,Jinlong Li
Volatile organic compounds (VOCs) emitted from industrial activities and transportation pose significant health risks to humans and contribute to environmental issues. As a result, there has been growing interest in developing effective technologies for VOC removal. This study investigates the removal of low-concentration VOCs from air using a membrane catalytic process that combines a supported ionic liquid membrane (SILM) with a novel visible light-driven photocatalyst. The system, consisting of a 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) SILM and N-doped La–TiO2 photocatalysts, achieves a mineralization rate of 40%–60% and a removal efficiency of approximately 75% for VOCs under visible light exposure for 10 hours. The synergistic effects of membrane separation and photocatalytic degradation significantly enhance the overall VOC removal efficiency compared to using either method alone. The membrane catalytic system demonstrates particular applicability and stability for various organic compounds, including toluene, acetone, chloroform, benzene, and xylene. Overall, this work presents a promising approach for the removal and mineralization of VOCs.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
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IF 8
Xue-Fei Chen,Xiangping Xian,Wei-Zhi Chen,Binmeng Chen
In this study, a pioneering methodology is delineated, wherein Fe 2 O 3 -enriched recycled red brick aggregates are harnessed as avant-garde carrier substrates, resulting in a profound enhancement of the intrinsic self-cleansing capabilities of TiO 2 . The innate porous core-shell architecture of these recycled aggregates engenders a notable synergistic interaction between nano-TiO 2 and Fe 2 O 3 , culminating in a marked escalation of photocatalytic efficiency. An exhaustive examination of the degradation proficiency across a spectrum of samples against methyl blue, conducted over a gradient of temporal intervals, has been executed. The findings indicate that the rates of degradation for all samples increase progressively with the prolongation of exposure to UV irradiation. The control group, consisting exclusively of white cement, demonstrated the most diminutive degradation rate, achieving merely a 4 % reduction in methyl blue concentration through UV irradiation alone. Conversely, the nano-TiO2-modified recycled grey brick aggregate (NT-RGBA) and recycled red brick aggregate (NT-RRBA) samples showcased substantially elevated degradation rates, a phenomenon attributable to the incorporation of photocatalytic agents capable of capitalizing on UV energy to expedite the degradation process of methyl blue. The NT-RRBA composite, an amalgamation of the photocatalytic attributes of TiO 2 , the synergistic interplay between Fe 2 O 3 and TiO 2 , and the intricate three-dimensional pore framework of RRBA, manifested the most pronounced degradation rate. To delve deeper into the determinants influencing the efficacy of photocatalytic degradation, a fuzzy inference system has been deployed to construct a mathematical model that scrutinizes the effects of variables such as the initial concentration of pollutants and the flow rate. This quantitative methodology affords to establish a functional relationship that encapsulates the underlying dynamics of the photocatalytic degradation phenomenon. Deploying this functional material, a derivative of construction detritus, paves the way for an innovative strategy of closed-loop resource utilization, marking a significant milestone towards sustainable development within the construction sector.
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