CRYSTENGCOMM
·
2024
·
IF 2.6
Chengwei Wang,Rui Wang,Yanan Liao,Kai Liu,Qingyi Zhang,Lei Wang,Dawei Gu,Feifei Qin,Feng Chen
PbX(OH) (X=Cl, Br, I) is considered one of the effective encapsulation matrixes to improve the stability and luminescence efficiency of perovskite. Several strategies have been explored to construct perovskite@PbBr(OH) composites with high photoluminescence quantum yield. However, there is limited research on their precise growth kinetics mechanism and morphology control. Here, PbBr2 microwires (MWs) were applied to act as the lead source and serve as a skeleton frame for the growth of CH3NH3PbBr3 (MAPbBr3) MWs. The structures transition from MAPbBr3 to MAPbBr3@PbBr(OH) MWs were triggered by the synergistic effect of H2O and CH3NH3OOCCH3 (methylamine acetate, MAAc). All components and synthesis processes used in this system are explicit which allows a more in-depth exploration of the MAPbBr3@PbBr(OH) formation kinetics. The results indicate that the hydrolysis of MAAc provides OH- and partly replaces Br- ions in MAPbBr3 to form MAPbBrxAc3-x intermediate, which induces the transformation of MAPbBr3 into PbBr(OH) and until the stable MAPbBr3@PbBr(OH) microwires are formed. Based on this growth kinetics process, utilizing H2O-MAAc and extra sodium halide (NaCl, NaI) mixture can synthesize MAPbBrnX3-n@PbX(OH) (X=Cl, I) microwires successfully. Our study can open a new avenue for developing high-efficiency and high-stability fluorescent hybrid perovskites for three primary color detectors, lasing cavities, and sensors.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ruixiang Li,Shu Chen,Beibei Wang,Xiaodan Wang,Xinyu Hu,Sonia Estrade Albiol,Cristian Fabrega Gallego,Hao Shen,Chunhua Luo,Hui Peng,Hechun Lin
Room-temperature gas sensors are crucial for detecting toxic gases and volatile organic compounds (VOCs). Conventional metal oxide semiconductor (MOS)-based sensors, however, often require high-temperature operation and suffer from low sensitivity. Here, we present a one-step mini-mechanochemical synthesis of CuO/M(OH) 2 (M = Mg, Ca) heterostructures that exhibit exceptional room-temperature sensing performance towards triethylamine (Et 3 N). Our results reveal a tenfold enhancement in the sensor response to Et 3 N compared to pristine CuO. This remarkable improvement is attributed to the in-situ formation of oxygen vacancies in CuO induced by the incorporation of M(OH) 2 , as evidenced by X-ray photoelectron spectroscopy (XPS), positron annihilation spectroscopy (PAS), and electron paramagnetic resonance (EPR). Notably, CuO/Mg(OH) 2 demonstrates superior long-term stability, while CuO/Ca(OH) 2 suffers from performance decay due to environmental carbonation. Furthermore, we developed a portable Et₃N analysis device based on the CuO/Mg(OH) 2 sensor, which enables real-time monitoring with Wi-Fi capability and achieves an accuracy within 6 % error across a 1 to 100 ppm detection range. This study not only provides a cost-effective and scalable fabrication method for CuO-based gas sensors but also highlights the potential of CuO/M(OH)₂ in practical applications for environmental monitoring and food safety assessment.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120354
·
IF 7.2
Dan Dang,Xinyi Jiang,Juncheng Zhang,Yichao Wu,Baoxin Zha,Yingying Zhao
The valorization of crude glycerol, a major byproduct of biodiesel production, into high-value chemicals is critical for sustainable biorefineries. Herein, we report a novel alkali-free and homogeneous photocatalytic strategy for selectively converting glycerol to glycolic acid (GLYA) and formic acid (FA) using H 2 O 2 as a radical initiator under 365 nm UV irradiation. By optimizing volume fraction of H 2 O 2 (3.18％), light intensity (10 W), and temperature (35 °C), 99.3 % glycerol conversion with 23.47 % GLYA yield and 22.66 % FA yield was achieved within 2 h at ambient pressure. Crucially, scavenging experiments, post-illumination reactivity studies and the electron paramagnetic resonance (EPR) spectra revealed a synergistic •OH /•O 2 ⁻/ 1 O 2 radical cycle triggered by H 2 O 2 photolysis: (1) •OH initiates glycerol oxidation to glyceraldehyde; (2) •O 2 ⁻ (generated from O 2 reduction or H 2 O 2 decomposition) produces 1 O 2, which drives selective C-C cleavage to GLYA; (3) •OH/•O 2 ⁻/ 1 O 2 cycle enables mutual regeneration of active species, sustaining oxidation even after light cessation. This autocatalytic cycle eliminates the need for strong bases or noble metals, offering a green, energy-efficient route for glycerol upcycling.
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高影响因子
ENERGY
·
2025
·
IF 9.4
Qi Zhou,Liu Wu,Jingyue Wang,Jie Liang
Lignin, with its complex structure and high stability, poses a significant challenge in the directed depolymerization to obtain aromatic-rich bio-oil. To prevent the formation of hard-shelled char resulting from the melting and agglomeration of lignin during pyrolysis, this study proposed a dual strategy combining Ca(OH) 2 pretreatment and Beta zeolite, which demonstrated a synergistic effect through β-O-4 bond cleavage, effectively suppressing lignin condensation while achieving high aromatic selectivity. In this study, the influence of various operational parameters was examined. Key variables including pretreatment procedures, concentration levels, catalyst selection, catalyst-to-raw material ratio, carrier gas velocity, and pyrolysis thermal conditions were analyzed to determine their effects on the critical processes. Pretreatment with 5 wt% Ca(OH) 2 significantly reduced lignin agglomeration during pyrolysis. Using Beta zeolite (1:1 mass ratio) in CFP at 500 °C with 75 mL/min carrier gas flow increased bio-oil yield from 5.0 wt% to 7.5 wt% and enhanced aromatic selectivity from 1.9 area% to 84.9 area%. Using 2-phenoxy-1-phenylethanol (α-OH-PPE) as a model compound, we found Ca(OH) 2 pretreatment and Beta zeolite together enhanced β-O-4 bond cleavage in lignin. This synergistic approach facilitated efficient bond cleavage and showed remarkable effectiveness in aromatic production.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Tingan Yao,Guohui Dong,Ying Gao,Dongfeng Sun,Hehua Zeng
This study successfully constructed a g-C₃N₄/FeOOH S-scheme heterojunction photocatalyst with lotus-leaf structural effects, addressing the challenges of insufficient oxygen and water adsorption sites and high photocurrent recombination rates in g-C₃N₄ photocatalysts. The optimized photocatalyst exhibits outstanding performance, generating hydroxyl radicals via dual pathways under visible light (generation rate: 2.8 μmol/(L·min)). The lotus-leaf effect in the composite was confirmed through morphology analysis, static water contact angle measurements, and oxygen adsorption/desorption experiments, demonstrating an 18.9-fold enhancement in oxygen capacity. In situ XPS, built-in electric field intensity measurements, and theoretical calculations confirm that the built-in electric field at the interface, directed from g-C₃N₄ toward FeOOH, drives an S-scheme charge transport pathway. This not only achieves efficient spatial separation of photogenerated carriers but also uniquely preserves the system's strongest redox capability, significantly enhancing photocatalytic efficiency. Furthermore, in situ infrared spectroscopy and electron paramagnetic resonance studies confirm the composite material's dual-channel mechanism for hydroxyl radical generation via oxygen reduction and water oxidation. This work provides robust experimental and theoretical foundations for understanding and designing S-scheme heterojunctions for dual-channel hydroxyl radical generation in photocatalysis.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Bojun Zhang,Mingliang Zhang,Sinong Wang,Jinchan Zhao,Zhenyu Dai,Yizhuo Li,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
Paper-based cultural relics possess great historical and cultural value but are vulnerable to irreversible degradation from high-energy ultraviolet (UV) light exposure and acidification, threatening their long-term preservation. Current paper protection predominantly relies on exogenous materials with single functions, which not only provide limited protective effects but also pose a risk of secondary damage. In this study, we developed a Dual-Functional paper by directly integrating a carbon quantum dot–magnesium hydroxide (CQDs@Mg(OH)2) nanocomposite into the papermaking process, thereby endowing the paper with intrinsic resistance to both acidification and UV-induced photodegradation, which reduces the reliance on subsequent protective treatments and fundamentally enhances the paper’s longevity. The results demonstrate that the functional paper integrated with CQDs@Mg(OH)2 nanocomposites shows good structural compatibility and strong resistance to degradation. Under the conditions of both UV exposure and dry-heat aging, the functional paper demonstrates excellent resistance to photooxidative and acid-induced degradation, indicating its strong potential for extending the longevity of paper-based materials. Additionally, the fluorescent properties of CQDs reveal promising potential as optical anticounterfeiting markers. This work opens an avenue for the design of long-lasting functional paper enabled by carbon-based materials, with promising applications in the preservation of paper-based cultural heritage.
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高影响因子
ChemCatChem
·
2025
·Vol. 17
·期 6
·e202401780
·
IF 3.9
Jingru Li,Siyuan Hu,Longmei Shang,Guowu Zhan
Graphical This study investigates N -doped Co 3 O 4 /Pt catalysts synthesized using a Pt-decorated ZIF-67 sacrificial template, followed by a water-soaking treatment to enhance surface hydroxyl (-OH) group content. The interfacial N -stabilized Co 3+ -OH-Pt active sites in N -Co 3 O 4 /Pt improved synergy between cobalt and platinum, enhancing agglomeration resistance and enhancing catalytic performance. CO 2 hydrogenation is a promising method for converting CO 2 into valuable products. Cobalt-based catalysts are favored for their low cost and high activity, but they face challenges from sintering-induced deactivation. This study investigates N -doped Co 3 O 4 /Pt catalysts synthesized using a Pt-decorated ZIF-67 sacrificial template, followed by a water-soaking treatment to enhance surface hydroxyl (─OH) group content. The as-designed N -Co 3 O 4 /Pt catalyst achieved a CO 2 conversion of 64% and CH 4 selectivity of 98% at 340 °C under ambient pressure. It was demonstrated that the interfacial N -stabilized Co 3+ -OH-Pt active sites in N -Co 3 O 4 /Pt improved synergy between cobalt and platinum, enhancing agglomeration resistance and enhancing catalytic performance. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) demonstrated that CO 2 is converted to methane mainly through a formic acid pathway, with no CO detected. This work underscores the critical role of surface hydroxyl groups in promoting CO 2 adsorption and activation, guiding the CO 2 methanation reaction toward efficient methane production.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 2
·B42
·
IF 3.12
Yongling Du,Yifeng He,Zhixiang Zheng,Xuan Shen,Yaxin Zhou,Tingxia Wang,Zhengping Zhu,Chunming Wang
Co(OH)2 nano particles (NPs)/three-dimensional graphene frameworks (3DGFs) nano-materials was fabricated via electrochemical methods. The Co(OH)2 NPs/3DGFs hybrid retain the 3DGFs's structure and have superior catalytic activity for glucose oxidation. The electrochemical sensors based on Co(OH)2 NPs/3DGFs exhibited high sensitivity of 2410 μA cm−2mM−1, wide linear range of 2 μM to 1.4 mM, low detection limits of 0.67 μM and a quick response (less than 3s) to glucose. The Co(OH)2 NPs/3DGFs were used as a high performance platform to detect glucose in human serum, fetal bovine serum, and human urine. The excellent catalytic activity of Co(OH)2 NPs/3DGFs is attributed to the high surface area of 3DGFs and the highly catalytic activity of Co(OH)2 NPs as well as the synergistic effects between Co(OH)2 NPs and 3DGFs. Importantly, the electrochemical glucose sensor could be renewable only being refreshed in 0.1 M NaOH for ten minutes.
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高影响因子
Arabian Journal of Chemistry
·
2021
·
IF 5.165
Na Li,Kai Yuan,Tengjia Gao,Shun Li,Jianliang Qin,Yirong Zhu,Jingjing Du,Lijian Xu,Jianxiong Xu
Design of electrode materials with excellent electrochemical properties for advanced energy storage device are important to the sustainable development of energy resources. In this manuscript, a novel hierarchical nanoporous carbon@nickel hydroxide (HNCMs@Ni(OH) 2 ) composites were prepared through simple in-situ chemical deposition of Ni(OH) 2 nanocrystals on HNCMs. By tailoring the deposition amount, core–shell structured rambutan-like HNCMs@Ni(OH) 2 microspheres with hairy nickel hydroxide nanocrystal covered on HNCMs were obtained. Ascribed to the high specific capacitance of nickel hydroxide and the interconnected hierarchical porous structure of HNCMs, the resultant rambutan-like HNCMs@Ni(OH) 2 microspheres as electrode materials display outstanding electrochemical properties including high specific capacity of 248.9 mAh/g at 1 A/g and good capacitance retention of 62.9% at 20 A/g. Furthermore, a hybrid supercapacitor with rambutan-like HNCMs@Ni(OH) 2 microspheres as cathode and HNCMs as anode were assembled and showed a comparable energy density of 41.3 Wh/kg at the power density of 173.3 W/kg and high capacity retention of 85.2% after 20,000 cycles at 5 A/g. As a proof of concept example, the fabricated hybrid supercapacitor can be utilized as energy source to instantaneous light up a red LED indicator. We envisioned that the as-prepared rambutan-like HNCMs@Ni(OH) 2 microspheres have great potential in constructing of advanced energy storage devices.
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高影响因子
Environmental Science-Processes & Impacts
·
2024
·Vol. 26
·期 9
·1526-1542
·
IF 4.3
Junwei Yang,Tianye Zhou,Yuting Lyu,Brix Raphael Go,Jason Chun-Ho Lam,Chak K. Chan,Theodora Nah
Many phenolic compounds (PhCs) in biomass burning and fossil fuel combustion emissions can partition into atmospheric aqueous phases (e.g., cloud/fog water and aqueous aerosols) and undergo reactions to form secondary organic aerosols (SOAs) and brown carbon (BrC). Redox-active transition metals, particularly Fe and Cu, are ubiquitous species in atmospheric aqueous phases known to participate in Fenton/Fenton-like chemistry as a source of aqueous ˙OH. However, even though the concentrations of water-soluble Cu are close to those of water-soluble Fe in atmospheric aqueous phases in some areas, unlike Fe, the effects that Cu have on SOA and BrC formation in atmospheric aqueous phases have scarcely been studied and remain poorly understood. We investigated the effects of Cu(II) on PhC reaction rates and BrC formation during the aqueous oxidation of four PhCs (guaiacol, catechol, syringol, and vanillin) by ˙OH generated from Fenton-like chemistry under different pH conditions. While the PhCs reacted when both H2O2 and Cu(II) were present in the absence (i.e., dark oxidation) and presence (i.e., photooxidation) of light, the reaction rates were at least one order of magnitude higher during photooxidation. Higher PhC reaction rates were measured at higher pH during both dark oxidation and photooxidation as a result of higher ˙OH concentrations produced by Fenton-like chemistry. Only water-soluble BrC was formed during dark oxidation and photooxidation when Cu(II) was present. Mass absorption coefficients (103 to 104 cm2 g−1) comparable to those of biomass burning BrC were measured during dark oxidation and photooxidation when Cu(II) was present. Light absorption was enhanced at higher pH during dark oxidation and photooxidation, which indicated that higher quantities and/or more absorbing BrC chromophores were formed at higher pH. The effects that Cu(II) had on the PhC reaction rates and the composition of SOAs and BrC formed depended on the PhC base structure (i.e., benzenediol vs. methoxyphenol). Overall, these results show how aqueous reactions involving Cu(II), H2O2, and PhCs can be an efficient source of daytime and nighttime water-soluble BrC and SOAs, which can have significant implications for how the atmospheric fates of PhCs are modeled for areas with substantial concentrations of water-soluble Cu in highly to moderately acidic cloud/fog water and aqueous aerosols.
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高影响因子
Polymers
·
2022
·Vol. 14
·期 23
·5255
·
IF 4.967
Xiaohong Yi,Jingshu Huang,Yizhang Tong,Hui Zhao,Xianwu Cao,Wei Wu
Biodegradable polylactide (PLA) has been widely utilized in people’s daily lives. In order to improve the fire safety of PLA, ammonium polyphosphate (APP) was self-assembled onto the surface of serpentine Ni3Si2O5(OH)4through the electrostatic method, followed by mixing with PLA by melt compounding. The APP-modified serpentine (serpentine@APP) dispersed uniformly in the PLA matrix. Compared with pure PLA, the PLA composite with 2 wt% serpentine@APP reduced the peak heat release rate (pHRR) and total heat release (THR) by 43.9% and 16.3%, respectively. The combination of APP and serpentine exhibited suitable synergistic flame-retardant effects on the fire safety enhancement of PLA. In addition, the dynamical rheological tests revealed that the presence of APP and serpentine could reduce the viscosity of PLA composites. The plasticizing effects of APP and serpentine benefited the processing of PLA. The mechanical properties of PLA/serpentine@APP maintained suitable performance as pure PLA. This study provided a feasible way to enhance the fire safety of PLA without sacrificing its mechanical properties.
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高影响因子
Journal of the Australian Ceramic Society
·
2019
·Vol. 56
·期 2
·795-801
·
IF 0.692
Zhang Tao,Wei Yaowu,Chen Junfeng,Li Nan
In spite of the advantages of CaO refractories, such as high refractoriness, potential to produce pure steel molten, and high alkaline corrosion resistance, their application has been limited due to its poor hydration resistance. Introducing additives to improve the hydration resistance of lime is a novel method. The influences of Mg(OH) 2 and sintering temperatures on the sintering and hydration resistance of CaO aggregates that were produced by thermal decomposition were investigated in this paper. The purpose of this work was to produce high-purity CaO raw material with high density, low porosity, well grain growth, and good hydration resistance economically. The sintered samples were characterized by bulk density, apparent porosity, surface appearance, and microstructure. The results indicated that (1) Mg(OH) 2 promoted the grain growth of CaO, reduced the apparent porosity, and improved the density of the specimens. The hydration resistance of the samples was increased. (2) Increasing the sintering temperature improved the hydration resistance of the specimens obviously in the experiment. (3) Grain size of CaO was more uniform with the increment of Mg(OH) 2 content, and the density of the compacts was improved.
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高影响因子
危险品化学品经营许可证（带存储）