FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
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2023
·
IF 2.3
Long He,Dan Li,Chengxin Zhou,Ming Wang,Yunlong Deng,Jian Gao
Herein, NiO cubes with {100} facets or NiO trapezohedrons with {311} facets modified graphite carbon nitride (g-C3N4) nanoparticles acidified by HCl (HCN) were fabricated to form a p-n heterojunction (NiO/HCN) for the first time. These were further used for the degradation of rhodamine B (RhB) in water. 8-{100}NiO/HCN exhibited the highest degradation efficiency of 98.56% in just 60 min within peroxymonosulfate (PMS) under visible light. It was 2.51% higher than that of 8-{311} NiO/HCN. A series of characterization and experimental results showed that introducing {100} NiO could improve both the photocatalysis and PMS activation efficiency of the g-C3N4 compared with {311} NiO. The influence of environmental parameters on RhB degradation was systematically studied as well. Stability experiments demonstrated that 8-{100}NiO/HCN maintained high catalytic performance over a period of 10 h. The degradation mechanism behind PMS activation under visible light involved several factors: the unique micron-nano interface structure, electron (e-) transfer between NiO and g-C3N4, as well as effective facilitation of PMS activation by Ni2+. These factors led to the formation of singlet oxygen (1O2), which contributed significantly to RhB degradation. Overall, this work highlights how facet design can be utilized in metal oxide cocatalysts to improve photocatalytic degradation performance.
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高影响因子
Water
·
2026
·Vol. 18
·期 16
·1928
·
IF 3.5
Yixin Pan,Yajun Chen,Wenshuo Zhang,Xiaofan Lv
A nitrogen-doped carbon-confined cobalt–iron bimetallic catalyst (CFNC) was fabricated through high-temperature pyrolysis of a ZIF-67-modified CoFe2O4precursor and employed as a heterogeneous activator for peroxymonosulfate (PMS)-mediated Rhodamine B (RhB) degradation. The physicochemical properties of the as-prepared catalyst were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) analysis. These analyses demonstrated that Co–Fe bimetallic species were successfully embedded within the nitrogen-doped carbon framework, forming a confined carbon-supported catalytic structure. Under optimized conditions (CFNC dosage of 20 mg L−1, PMS concentration of 150 mg L−1, and initial pH of 7), the CFNC/PMS system achieved 99.45% RhB removal within 10 min. Moreover, the catalyst retained 78.91% degradation efficiency after five successive cycles, indicating its satisfactory reusability and structural stability. Mechanistic investigations based on radical scavenging experiments and electron paramagnetic resonance (EPR) analysis revealed that PMS activation over CFNC involved the coexistence of radical and non-radical oxidation pathways, in which singlet oxygen (1O2) played a predominant role. The defect-rich nitrogen-doped carbon matrix facilitated PMS adsorption and activation, promoting the selective formation of1O2, while the confined Co–Fe bimetallic sites contributed to efficient electron transfer during the catalytic process. The synergistic coupling between the Co–Fe active centers and conductive carbon framework accounted for the enhanced catalytic performance, suppressed metal leaching, and long-term stability of CFNC. This work presents a promising approach for constructing robust bimetallic carbon-based catalysts and advances the application of PMS-driven advanced oxidation processes for wastewater remediation.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Yanqun Zhang,Kefeng Zhao,Jingtao Huang,Hsien-Yi Hsu,Jingwei Xu,Rafael Luque,Wenxin Niu,Guobao Xu
Micelles of surfactants have been employed as a powerful tool for the synthesis of hollow nanostructures. Nonetheless, it is still challenging to use micelles to direct the growth of hollow nanostructures with open interiors, especially for crystalline materials. Herein, we report a versatile method to precisely synthesize non-centrosymmetric hollow BiOCl nanocaps with open interiors for the first time. The growth mechanism of the hollow BiOCl nanocaps is elucidated, and the openings of BiOCl nanocaps can be precisely controlled by fine tuning their growth conditions. The non-centrosymmetric BiOCl nanocaps yield a pseudo-first-order degradation kinetic rate constant of up to 0.1217 min–1 in the photodegradation of rhodamine-B, 7.8 times higher than that of common BiOCl nanoplates. This suggests that BiOCl nanocaps show excellent photocatalytic performance to degrade colored rhodamine B. Furthermore, the BiOCl nanocaps can be also extended in the photodegradation of colorless contaminants in industrial wastewater. More importantly, the micelle-directed growth strategy can be generalized to synthesize non-centrosymmetric BiOCl0.5Br0.5 and BiOBr hollow nanocaps. This synthetic strategy heralds a paradigm for designing non-centrosymmetric hollow nanostructures with micelles and may open up an avenue for unique hollow nanomaterials with tailorable structures and properties.
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FLOW MEASUREMENT AND INSTRUMENTATION
·
2022
·
IF 2.42
Jiahui Zhang,Jingquan Luo,Yiwei Wang,Bo Dong,Zhen Xu,Lin Wang,Aixian Liu,Xuqiang Guo
Hydrodynamic cavitation (HC) commonly occurs within industrial pipelines and its unsteady flow characteristics are of great significance for energy conservation and efficiency improvement. This study investigates the effects of methanol concentration (0–20 wt%) on the cavitating flow characteristics and the degradation of Rhodamine B (RhB) under operating conditions of a 0.7 MPa pressure drop, temperature of 30 °C, 200 passes through a venturi reactor, and an initial RhB concentration of 40 μmol/L. The transient cavitation behavior was monitored using a high-speed camera. The cavitation images show that the presence of methanol generates more stable bubbles, which results in less violent bubble collapse. The pressure pulsation and vibration induced by cavitation flow were synchronously measured using high-frequency pressure and acceleration sensors. The spectral analyses of the pressure pulsation indicate that methanol has no effect on the dominant frequency (∼5.5 Hz) at different positions, and the amplitude initially increases with increasing methanol concentration and then stabilizes. The pressure pulsation intensity increases due to the increased vapor pressure of the solution. The vibration spectral analyses show that methanol has little effect on the peak frequencies, which occur near 4.0 kHz and 14.3 kHz of the low and high-frequency bands, respectively, whereas the peak amplitude decreases with increasing methanol concentration. The per-pass degradation model of RhB in methanol solution considering pyrolysis of methanol was verified for the first time and show to adequately describe the experimental data. The degradation percentage and per-pass degradation factor decrease with increasing methanol concentration. The reduced surface tension of the solution prolongs the bubble lifespan and prevents bubble coalescence , thus weakening the vibration and degradation performance . The results provide important insight for cavitation applications and degradation modeling of mixed solutions.
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Zhu Bingxing,Yu Yang,Ding Yindi,Ge Shifu
Anaerobic granular sludge (AnGS) is a potential resource for biochar production due to its unique microstructure and high organic contents. In this study, Fe 3 O 4 -loaded biochar derived from AnGS as a catalyst for peroxymonosulfate (PMS) activation was synthesized through iron modification and pyrolysis at different temperatures. The biochar characterization indicated that surface area (249.145 m 2 g −1 ) and microporosity (131.819 m 2 g −1 ) were significantly enhanced at 800 °C. Furthermore, the excellent magnetic properties of the iron-modified biochar at 800 °C (S@Fe-800) (45.28 emu g −1 ) were confirmed, in which Fe 3 O 4 was identified as the dominant reactive species. S@Fe-800 exhibited remarkable PMS activation ability for organic pollutants, which displayed superior Rhodamine B (RhB) removal efficiency. Results from the quenching experiments and electron paramagnetic resonance (EPR) detections demonstrated that the reactive oxidizing species (ROS), including sulfate radical (SO 4 •− ), were generated in the S@Fe-800/PMS system. Meanwhile, the significant intermediates and possible degradation path of PMS decomposition over RhB were proposed. It is believed that this work provides an effective method for organic contaminants removal and a green utilization route for AnGS.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Qin Yang,Yujie Zhang,Jie Liang,Yongsong Luo,Qian Liu,Yingchun Yang,Xuping Sun
Sulfate radical based advanced oxidation processes (SR-AOPs) are regarded as a promising technology to degrade organic pollutants in water. Here, hydrothermally synthesized Co-glycerate (Co-G) microspheres are proposed as an efficient heterogeneous catalyst to activate peroxymonosulfate (PMS) for degradation of refractory organic pollutant rhodamine B (RhB) in aqueous solution. The presence of Co-G microspheres enhanced the degradation rate significantly with a short full degradation time (8 min) and a total organic carbon (TOC) removal exceeding 41% (10 min), thus implying the excellent catalytic performance of Co-G microspheres for PMS activation. Furthermore, the effects of PMS and catalyst concentration, initial pH value and co-existing ions on RhB degradation were investigated. Radical quenching and EPR tests identify that active species including SO 4 - ·, HO·, O 2 - · and 1 O 2 are involved in the degradation process. Additionally, a possible reaction mechanism of PMS activation by Co-G microspheres for RhB degradation was suggested. This study can provide a new insight for design of cobalt-based heterogeneous catalysts as activators to activation PMS for pollutants degradation.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Shaoxiong Feng,Weigang Ding,Yan Zhang,Jingwei Wu,Zhiming Zou,Tongfa Wu,Qun Tang
A novel neodymium-based metal-organic framework (Nd-MOF) {[Nd 2 (Hpdc) 3 (H 2 O) 6 ]·3H 2 O} n (H 3 pdc = 1H-pyrazole-3,5-dicarboxylic acid) was synthesized by a simple hydrothermal method and structurally characterized. By dropped onto glassy carbon electrodes (GCE), the prepared Nd-MOF was applied to construct an efficient electrochemical sensor for the rapid and reliable electrochemical detection of Rhodamine B (RhB). This proposed Nd-MOF/GCE sensor exhibited strong accumulation ability and high electrocatalytic activity for RhB. Electrochemical oxidation signal of RhB at the Nd-MOF/GCE was greatly enhanced as compared to that at the bare GCE. The effective factors such as pH of buffer solution , amount of Nd-MOF suspension and accumulation time were optimized for the quantitative detection of RhB. Under optimum conditions, the fabricated sensor showed two wide linear ranges of 0.08–2.0 and 2.0–40 μM with a low detection limit of 3.6 nM, which was ascribed to the advantages of Nd-MOF such as large specific surface area, multiple active sites, strong accumulation ability. Moreover, the developed Nd-MOF/GCE sensor displayed good selectivity and accuracy towards RhB detection in the actual samples. Thus, this simple and efficient approach for RhB detection has good prospective for application in environmental monitoring.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Qian He,Shengyi Zhuang,Yuxiu Yu,Haojie Li,Yaodong Liu
Quick and visual detection of component contents, such as water, in a mixed solvent is important for many practical applications, and a full range detection is especially preferred. In this work, a carbon dots based ratiometric fluorescent sensor was synthesized by grafting fluorescent group (Rhodamine B, RhB) on carbon dots, and the dual emission peaks exhibited a linear ratiometric response with the change of polarity and hydrogen bond of Solvent Hansen solubility parameters. This responsive behavior is attributed to surface state photoluminescence mechanisms, and has been used for the quantitative detection of water content in ethanol with an excellent linear relationship (R 2 = 0.996), a low detection limit (0.2%), and a full detection range (0–100%). Furthermore, a paper-based ratiometric fluorescence sensing strip is also demonstrated, which exhibits good storage stability and sensitivity. This study suggests that RhB grafted carbon dots could be feasibly and effectively used as ratiometric fluorescent sensors for solvent content detection.
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PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 12
·4847-4857
·
IF 1.941
Wang Hui,Zhang Jia-Rui,Wu Xiang-Feng,Wang Chao,Li Yan,Ci Li-Jie,Jia Yun-Ning,Chang Tian-Long,Liu Xu-Tao,Fu Yun-Xuan
Ag 2 WO 4 is a typically noble metal based photocatalyst with highly efficient photocatalytic activity. However, due to photocorrosion, the pristine Ag 2 WO 4 is prone to inactivation during illumination. Constructing composite photocatalyst may be a useful method to promote the stability of Ag 2 WO 4 . In this work, Ag 2 WO 4 /graphitic carbon nitride nanotubes (g-C 3 N 4 NTs) composite photocatalyst was prepared by adopting an in-situ composite strategy. The photocatalytic performance of the samples was discussed by the degradation of rhodamine B under visible light, and the catalytic mechanism was also analyzed. The characterization results show that the photocatalytic efficiency of the as-prepared Ag 2 WO 4 /g-C 3 N 4 NTs composite increases firstly and then decreases along with the increase of the Ag 2 WO 4 content. When the theoretical molar ratio of Ag 2 WO 4 :g-C 3 N 4 NTs reaches 3:2, the photocatalytic degradation efficiency achieves the optimal value, that is 92.4% within 20 min, which obviously exceeds 2.8% of pure Ag 2 WO 4 and 48.9% of pure g-C 3 N 4 NTs. Moreover, the separation and migration efficiency of photoelectron–hole pairs of the composites can be accelerated in comparison with pure samples. In addition, superoxide radicals and hydroxyl radicals play major roles in the photocatalytic degradation process.
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Journal of Cleaner Production
·
2021
·
IF 9.297
Yanping Cui,Zhengwei Zhou,Ya Gao,Lidan Lei,Jungang Cao,Ruojie Wu,Lili Liang,Zhaoqiang Huang
Without external O 2 supply and solution pH adjusting, commercial molybdenum sulfide (MoS 2 ) was firstly applied as co-catalyst in intermittent electro-Fenton process for Rhodamine B (RhB) degradation. In this energy saving system, Fe 2+ /Fe 3+ conversion was facilitated and H 2 O 2 activating was accelerated by MoS 2 . Granular activated carbon wrapped with stainless steel mesh (GACSS) was used as cathode, from which, H 2 O 2 and iron sources were in-situ generated. With 0.1 g/L MoS 2 , and 50 mA applied current with 10 min on-10 min off power frequency, RhB degradation rate constant in the MoS 2 intermittent electro-Fenton was approximately 2.4 times as that without MoS 2 system. Quenching experiments, electron spin resonance (ESR) characterization and free radical fluorescence tests demonstrated hydroxyl radicals (·OH) was the dominant reactive species, and the superiority of intermittent electrolysis mode for RhB degradation. During power on, H 2 O 2 was constantly generated on cathode. In electricity interval, Fe 2+ /Fe 3+ conversion was accelerated on the active sites (Mo 4+ ) to activate residual H 2 O 2 and more ·OH was generated to RhB degradation. Additionally, the characterization analysis (XPS, SEM and FT-IR) demonstrated MoS 2 and GACSS cathode exhibited excellent catalytic and chemical stability in recyclability . Low-cost multifunctional cathode with a high efficiency co-catalyst was combined in this energy saving electro-Fenton operating system for RhB degradation.
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高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 4
·期 11
·3216-3225
·
IF 6.788
Majid Basharat,Muhammad Shuaib Khan,Yasir Abbas,Shuangkun Zhang,Hanlin Ma,Zhanpeng Wu,Wei Liu
The utilization of solar energy is an epitome towards water splitting for hydrogen generation and environmental remediation. For efficient use of solar energy, photocatalysts capable of light-harvesting, with appropriate band energetics, that are inexpensive, stable, and scalable, are desired. Herein, a prototypical cyclotriphosphazene (P3N3)-based covalent inorganic–organic hybrid framework (CIOF) is designed with highly crosslinked aggregation that can produce hydrogen fuel from photocatalytic water splitting, as well as the degradation of industrial waste-water pollutant (rhodamine B). The P3N3-CIOF was synthesized by the aggregation, self-assembly, and subsequent polycondensation of hexachlorocyclotriphosphazene, tris(4-hydroxyphenyl)ethane and pyridine, in one-pot under ultrasonication. Morphology and structure of the newly synthesized P3N3-CIOF are characterized through scanning electron microscopy, Fourier transform infrared spectroscopy, solid-state 31P and 13C nuclear magnetic resonance spectroscopy, X-ray photoelectron microscopy, UV-visible absorbance, photoluminescence, and micro-spectrophotometry. The P3N3-CIOF shows selective response to the UV-visible light by emitting bright green (Ex. 365 nm), yellow (Ex. 420 nm), and red (Ex. 546 nm) colors. Moreover, the onset bandgap (2.14 eV) and the potential of the conduction band (−0.26 eV) and valence band (+1.88 eV) straddle the potential range for photocatalytic water splitting and dye degradation. The as-synthesized P3N3-CIOF continuously produced hydrogen fuel (24.5 μmol g−1 h−1) during photocatalytic water splitting for a period of 16 h, using Pt (3 wt%) and triethanolamine as the co-catalyst and holes scavenger, respectively. It also showed photodegradation ability to rhodamine B as a proxy dye to industrial waste-water pollutants. The plausible photocatalytic mechanism is also proposed based on the energetics of the photogenerated excitons, and scavenging experiments. These findings exemplify a critical first step towards photocatalytic hydrogen generation and remediation of organic pollutants through P3N3-CIOF, as well as motivation to engineer new materials based on aggregation-induced phenomena.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 6
·2414-2422
·
IF 3.288
Panqi Huang,Jingfei Luan
A highly efficient Ag3PO4/GaOOH composite was innovatively prepared and its photocatalytic performance was evaluated through degrading rhodamine B (RhB) under illumination, in this paper. Characterizations including XRD, SEM-EDS, TEM, FT-IR, XPS, UV-Vis DRS, PL and EPR were performed to analyze the properties of the Ag3PO4/GaOOH composite. The SEM-EDS results indicated that Ag3PO4 particles were dispersed on the surface of GaOOH sticks. The (210) plane of Ag3PO4 particles and the (200) plane of GaOOH sticks were simultaneously observed in the TEM results. UV-Vis DRS analysis indicated that the spectrum of the Ag3PO4/GaOOH composite showed a significant red shift compared to that of pure GaOOH. PL spectra also indicated that the construction of the Ag3PO4/GaOOH composite significantly declined the recombination rate of photogenerated electrons-hole pairs. The photocatalytic degradation experiments showed that the 30 wt% Ag3PO4/GaOOH composite demonstrated excellent performance under illumination. After a reaction time of 60 min, the decolorization rate of RhB was up to 97.83% using the 30 wt% Ag3PO4/GaOOH composite. Further studies confirmed that the 30 wt% Ag3PO4/GaOOH composite had good stability and the contribution of active species during degradation was of the order h+ > ˙O2− > ˙OH. The results of this study would provide a new perspective for improving the applications of wide band gap semiconductors, particularly for light-induced degradation.
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