ChemCatChem
·
2024
·
IF 3.8
Mingwei Wang,Zhen Shi,Zhiquan Yu,Shushuang Li,Zhixin Zhang,Feng Wang
Graphical The HCHO-acetaldehyde condensation is a typic aldol reaction and a critical step to produce 1,3-propanediol from methanol and ethanol. The cross condensation of HCHO and acetaldehyde to acrolein has been conducted over MgO/SiO 2 catalyst, which shows the synergistic catalysis by the acidic sites (Mg-O-Si structure) and basic sites (Mg-O-Mg structure) for activation of HCHO and acetaldehyde, respectively. Acid-base synergistic catalysis greatly enhances the performance of MgO-based catalysts in the Aldol condensation. In this paper, the effect of acid-base strength/concentration/proportion and the synergistic catalysis on the performance of cross condensation between HCHO and acetaldehyde were studied. The NH 3 /CO 2 -TPD results indicated that the weak acidic sites combined with the medium basic sites were beneficial for the cross condensation of formaldehyde and acetaldehyde. The loading of MgO nanocrystals on SiO 2 induced the generation of new acidic sites (Mg-O-Si). Combined with the inherent basic sites (Mg-O-Mg) and Mg-O-Si, the acid-base bifunctions sites could catalyze the cross condensation of HCHO and acetaldehyde synergistically. The appropriate proportion of acidic/basic sites (10/1) was critical for the cross condensation in the presence of vast water in formalin. The effect of reaction parameters, including molar ratio of substrates, reaction temperature, linear velocity and weight hourly space velocity, were investigated for the cross condensation. The results showed that 10 wt% MgO/SiO 2 catalysts exhibited the highest catalytic activity (57.9% conversion of acetaldehyde and 84.3% selectivity of acrolein) under the optimal reaction parameters among the investigated catalysts. The catalytic performance of MgO/SiO 2 could be recovered after in situ regeneration in air to remove the carbon deposition.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Suhong Lu,Shuo Wang,Yewei Chen,Xinru Chen,Zhongtao Jiang,Chengyu Xu,Jurong Liu,Guilong Liu,Yuzhen Fang
Dumbbell-shaped α-MnO 2 hollow microspheres were synthesized via surface chemical oxidation of MnCO 3 microspheres using KMnO 4 , followed by removal of the residual MnCO 3 template with HCl. Subsequently, a series of Ag-modified α-MnO 2 catalysts with nominal loadings of m % Ag ( m = 0.05, 0.1, 0.3 and 0.5) were prepared through a redox etching process using H 2 O 2 . The strong interaction between highly dispersed Ag and the α-MnO 2 support was found to enhance the low-temperature reducibility and generate abundant active oxygen species. Furthermore, the presence of Ag increased the concentrations of Mn 2+ and Mn 3+ species, thereby facilitating the formation of oxygen vacancies. Simultaneously, the dynamic redox cycles between Ag + /Ag and Mn 4+ /Mn 3+ significantly improved oxygen mobility within the catalyst. These synergistic effects collectively contributed to the outstanding catalytic performance of the 0.3% Ag/α-MnO 2 , which achieved 75.8% HCHO conversion at 30 °C and reached complete conversion at 50 °C. In situ DRIFTS studies revealed that the addition of Ag into α-MnO 2 promoted the carbonate species qulickly converted into CO 2 and H 2 O. Both α-MnO 2 and 0.3% Ag/α-MnO 2 catalyst followed a similar reaction pathway of HCHO → DOM → HCOOH → H 2 CO 3 → CO 2 + H 2 O.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiao Wang,Wenjing Liu,Tongkai Wang,Yuli Zhao,Gang Zhao,Shouwei Zhang,Jinzhao Huang,Xijin Xu
Amorphous/crystalline heterophase composites possess expansive reaction interfaces and abundant oxygen vacancy defects, providing novel electron-hole transmittal mode and significantly facilitating the surface adsorptions and redox reactions . Herein, galvanic replacement reaction (GRR) was used to construct amorphous SnO x / crystalline Co 3 O 4 multishell heterostructures . Characterizations indicated the continuous transition from Co 3 O 4 to amorphous SnO x on each shell, generating abundant amorphous/crystalline interfaces. Moreover, the oxygen vacancy defects concentration also increased with the GRR proceeding. Benefitting from theses, the surface oxygen adsorption was facilitated due to more surface active sites and enhanced carrier densities. However, with further increasing the reaction time, decreased adsorbed oxygen concentrations were detected, owning to the unexpected high potential barriers induced by excessive heterojunctions . Gas sensing results showed that the sensors with 1 h GRR exhibited the best sensing performance with an exceptional response (1268) to 100 ppm formaldehyde gas and low detection limit (21 ppb) at low working temperatures (100 °C). The synergistic effects between oxygen vacancy defects and amorphous/crystalline heterophase interfaces on the superior gas sensing behaviors were also investigated. Most importantly, results presented will shed lights on the rational design of highly sensitive gas sensors through amorphous/crystalline interfaces constructions.
研究领域:
材料科学
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传感器技术
·
表面化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jinyu Huang,Jianwei Li,Zhonglei Zhang,Junda Li,Xiangdong Cao,Jihua Tang,Xuejin Li,Youfu Geng,Jiaqi Wang,Yu Du,Yatao Yang,Xiaofang Pan
Detecting trace ppb-level of formaldehyde (HCHO) in indoor ambient and human exhaled breath using metal oxide semiconductor (MOS) gas sensor has attracted increasing attention. Herein, Ag nanoparticles (Ag NP) modified In 2 O 3 and Au nanocage (Au NC) modified In 2 O 3 as well as bimetal Ag NP and Au NC co-modified In 2 O 3 were successfully prepared via one-step microwave-assisted solvothermal method and were used to construct semiconductor gas sensor. It is exciting to observe that the sensor based on Ag 6 Au 1 /In 2 O 3 exhibits the highest response of 277 toward 5 ppm HCHO at low operating temperature (170 °C), which is about 7 times, 38 times and 102 times higher than 6 wt. % Ag/In 2 O 3 , 1 wt. % Au/In 2 O 3 and pristine In 2 O 3 , respectively. Moreover, the selectivity and detection limit (down to 26 ppb) of Ag 6 Au 1 /In 2 O 3 sensor to HCHO have been proven to be greatly improved. This excellent sensing performance indicates that the proposed bimetal Ag and Au co-modification with synergistic catalysis effect offers an effective design for highly sensitive and efficient HCHO detection devices. Moreover, the mechanism of HCHO sensing with Au and Ag co-loaded In 2 O 3 was explored by the calculations obtained from first-principle density functional theory studies .
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2026
·Vol. 34
·期 7
·177
·
IF 5.6
Li Bingbing,Lin Guoguo,Liu Xixi,Wu Mengdi,Zhi Shuangcheng,Zhu Mingyu,Ye Yanxin,Chen Yanyan,Liu Junhong,Sun Jie
The escalating contamination of water resources by chlortetracycline hydrochloride (CTC) poses significant threats to human health and ecosystems, necessitating the development of effective adsorbents. This study presents a novel β -resorcylic-HCHO type phenolic composite (RPC) as an efficient and regenerable adsorbent for CTC removal under high-concentration conditions. The RPC, featuring abundant carboxyl (-COOH) and phenolic hydroxyl (-OH) groups, achieved a removal efficiency of 90.1% and an adsorption capacity of 69 mg/g under typical operational conditions (1 g RPC treating 15 mL of 5 mg/mL CTC solution at pH ≈ 6.0 and 298 K). The adsorption process was spontaneous and best described by pseudo-second-order kinetics and the Freundlich isotherm, indicating significant chemical interactions (ion exchange, electrostatic attraction) alongside physical contributions (π-π interactions, hydrogen bonding, and swelling-induced diffusion). Over 90% of adsorbed CTC was desorbed using a binary eluent (95% ethanol + 8% MgCl 2 , w/v). Importantly, the regenerated RPC retained over 85% of its initial capacity after five consecutive adsorption–desorption cycles, demonstrating superior regenerability compared to many reported adsorbents. Although its maximum adsorption capacity is moderate, RPC’s excellent reusability and robust performance under high-concentration conditions highlight its potential for treating antibiotic-contaminated wastewater, pending further techno-economic assessment for scale-up.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xueming Bao,Leilei Wu,Biaobiao Yan,Ying Liu,Man Zhou,Qiang Wang,Ping Wang
Transition metal oxides have shown great potential in catalytic indoor pollutant removals, but their applications are hindered by the poor aqueous dispersity, inhalable powder forms and concerning substrate adhesion. Herein, we proposed a simple technique to fabricate durable textile coatings with ‘brick-mud’ nanostructure of Ti 3 C 2 T x (MXene) and manganese dioxide (MnO 2 ). Viscosity-controllable inks were prepared by hybridizing inulin-templated MnO 2 nanoparticles with acid-etched MXene nanosheets at room temperature, establishing firm bindings through coordination bonds between transition metal cores and hydroxyls, covalent redox linkages of Mn/Ti vacancies and intermolecular hydrogen bonds. Meanwhile, the high flatness of MXene optimized the binder/catalyst-free deposition of MnO 2 onto cotton textiles, simplifying the finishing process and providing MXene@MnO 2 coatings with encouraging fastness through the aforementioned triple bridges. Consequently, the resulting textiles exhibit satisfactory photo-antibacterial activities against gram negative and positive bacteria (>99 % within 10 min), accompanying with promising formaldehyde (HCHO) removal ability (>83 % within 30 min) and encouraging ultraviolet-absorption property (<0.05 % of UVA). Summarily, the presented deposition strategy of ‘brick-mud’-like coatings of transition metal catalysts on textiles provides a reliable alternative for the fabrication of multifunctional home textiles to improve indoor living quality.
研究领域:
材料科学
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环境科学
·
纺织工程
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xueming Bao,Bingjie Fan,Yuanyuan Yu,Ying Liu,Man Zhou,Qiang Wang,Ping Wang
Nowadays, the applications of nanoparticle-decorated textiles for environmental governmental governance have aroused great concerns, while the poor fastness and uncontrolled aggregation of the nanoparticles negatively influenced its practical use. Herein, an environmental-friendly synthesis strategy of water-dispersible MnO 2 was demonstrated by using the reductant of 2-(N-morpholino) ethanesulfonic acid (MES) and template of cetyltrimethylammonium bromide (CTAB), and then the as-prepared MnO 2 was further employed as a multifunctional textile coating. In all the procedures under room temperatures, three effects of cationic CTAB micelles were thoroughly explored, from optimizing MnO 2 to uniform micro/nanoscale through template strategy, to bridging the gaps between electronegative particles and fabrics, and even providing stable antibacterial effect. Consequently, without any additional binding agents, multifunctional cotton textile was obtained by simply immersing cotton into a MnO 2 -CTAB aqueous solution, and appeared antibacterial rates (over 99 %) to both E. coli and S. aureus . Meanwhile, HCHO removal and ultraviolet blocking (UVA<0.1 %) properties as well as high durability of the nanoparticles are also introduced to the textiles. We believe as-presented cationic surfactant-templated strategy for regulating synthesis and deposition of functional particles onto cotton textiles has broad application prospects in green and sustainable functionalization of decoration textiles.
研究领域:
环境科学
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材料科学
·
纺织工程
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DOI
高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2024
·
IF 2.1
Yufei Zhang,Sile Liu,Chuan Tian,Peng Xu,Xinzhong Deng,Congna Lv
To solve the pollution of natural water bodies by organic dyes and the exceeding of indoor HCHO standards caused by renovation, the study realized the band gap modulation of g-C3N5, a novel semiconductor photocatalytic material, by using H3BO3 as a source of nonmetallic B. The prepared B/g-C3N5 has shown excellent photocatalytic performance and stability for organic dye degradation in water bodies and indoor HCHO removal. The degradation rate of methylene blue (MB) reached 95% in 60 min of visible light, and the removal rate of HCHO reached 96.3% in 180 min of visible light. The MB and HCHO were efficiently degraded to small molecule inorganic compounds such as CO2 and H2O under the oxidation of active groups such as ·O2− and h+. The doping of nonmetallic B realizes the efficient separation of e−-h+ of g-C3N5, improve the absorption performance of visible light, and broaden the spectral range significantly. The modulation of the g-C3N5 band gap provides a potential application scenario for the development of novel photocatalytic materials.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuting Qian,Wenrou Tian,Jun Han,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jianmei Lu
Catalytic oxidation of HCHO is often limited by the serious recombination of carriers in photocatalysts and the high cost of thermal catalysts based on precious metals. Herein, Bi 4 Ti 3 O 12 nanosheets enriched with bismuth vacancies were synthesized and decorated by UiO-66-NH 2 to obtain VBiTO@NU-66 for efficient removal of HCHO via piezocatalytic oxidation. The Bismuth vacancies in VBiTO enhanced the asymmetry of the crystal structure and introduced the atomic-level channels for energy and electron transfer. After loading UiO-66-NH 2 , the adsorption ability was substantially improved by the formation of Schiff-base covalent bonds between HCHO and –NH 2 . Under the joint action of adsorption and piezocatalysis, piezocatalytic oxidation rate of 300 mg/m 3 HCHO by VBiTO@NU-66 was as high as 95.1% within 3 h, which was 6 times of that of pure BiTO nanosheets. This work offers a novel tactics for the efficient purification of gaseous environmental pollutants.
研究领域:
环境科学
·
材料科学
·
催化
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产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Suhong Lu,Shuo Wang,Chengyu Xu,Yewei Chen,Nan Sun,Jurong Liu,Yuzhen Fang,Guilong Liu
A series of setaria viridis-like Mn 2 O 3 @MnO 2 - T ( T = 3, 6, 9, 12 and 15 h) heterojunctions with switchable nanotube/nanosheet morphologies were synthesized via a controllable redox process. This involved precisely regulating the duration of acidic KMnO 4 treatment to induce in situ MnO 2 growth on rod-like Mn 2 O 3 substrates. Among these, Mn 2 O 3 @MnO 2 -12 exhibited the highest catalytic activity and outstanding stability, achieving 100 % conversion of 150 ppm HCHO at 50 °C under conditions of 30 % relative humidity and 36,000 mL g cat −1 h −1 . The strong electronic coupling at the interface between the Mn 2 O 3 (211) and MnO 2 (110) planes lowered the energy barrier for HCHO oxidation. Lattice mismatch at this interface likely induced oxygen vacancies, critical for activating O 2 into reactive oxygen species. Correspondingly, abundant surface active oxygen was observed in Mn 2 O 3 @MnO 2 -12, which contributed to the formation of dioxymethylene and formate intermediates, as monitored by in situ DRIFTS. Furthermore, greater charge enrichment on Mn combined with a lower work function ( W f ) indicated enhanced electron transfer to reactants and intermediates, establishing a favorable catalytic environment. This study provides a viable strategy for designing cost-effective, highly efficient transition metal oxide catalysts suitable for low-temperature HCHO oxidation.
研究领域:
材料化学
·
环境催化
·
纳米材料科学
·
表面科学
·
大气污染控制
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 82
·78257-78263
·
IF 3.289
Jiabao Cui,Jingjing Jiang,Linqi Shi,Fei Zhao,Dejun Wang,Yanhong Lin,Tengfeng Xie
Ni-Doped ZnO nanofibers have been synthesized by a simple, facile electrospinning method. The structure and morphology of the products were characterized by SEM, HRTEM and XRD analysis. X-ray photoelectron spectroscopy (XPS) confirmed that Ni2+ ions exist in the ZnO nanofiber structures. The photoelectric gas-sensing tests reveal that the response was significantly enhanced by Ni doping, and the 0.7% molar ratio Ni-doped sample (NZ0.7) exhibits the highest response of 532.7% to 100 ppm HCHO at room temperature. Photoluminescence (PL) measurements show that there are more donors in Ni-doped ZnO nanofibers by the introduction of Ni2+ ions. Furthermore, the surface photovoltage (SPV) and transient photovoltage (TPV) tests indicated that Ni doping can effectively enhance the donor density, which could facilitate charge separation and transport in the semiconductor, and promote photogenerated holes to move toward the irradiated surface of the samples. These results contribute to the photocatalytic oxidation of HCHO so as to achieve higher gas-sensing properties for Ni-doped ZnO nanofibers.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Small
·
2025
·
IF 12.1
Yanlin Zhang,Changming Zhang,Zheng Zhang,Huakang Zong,Pengwei Tan,Liyang Luo,Yuanyuan Luo,Guotao Duan
In the sensing field, the electronic structure of sensing materials has a great influence on the properties of the sensors. Here, by Ga doping pure rhombohedral In 2 O 3 (h-In 2 O 3 ), the double-phase In 2 O 3 (cubic/rhombohedral In 2 O 3 , c/h-In 2 O 3 ) porous nanospheres are obtained. And then Micro Electromechanical System (MEMS) gas sensors based on monolayer film are further fabricated by self-assembling the above nanospheres. The 5% Ga-doped In 2 O 3 sensors exhibit excellent HCHO sensing performance with a high-response (110.6@100 ppm), rapid response/recovery time (5.2/18.4 s) and low limit of detection (50 ppb) at an operating temperature of 180 °C. The 5% Ga-doped In 2 O 3 sensors also show high consistency (fluctuations of only 8.3%). Besides, a handheld device is developed to enable real-time monitoring and early warning of indoor HCHO at ppb-level. Based on experimental results and DFT theoretical calculation, the enhanced sensing mechanism is revealed, which is correlated with the optimization of electronic band structure by Ga doping and the appearance of double-phase heterostructures caused by Ga doping. Therefore, the relationship between electronic structure and gas sensing properties has also been established. This work significantly introduces a novel approach for the mass production of MEMS gas sensors, ensuring high sensitivity, repeatability and consistency.
研究领域:
材料科学
·
传感器技术
·
环境监测
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DOI
PubMed
高影响因子
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