Advanced Powder Technology最新文献_第4页

An innovative process for clean ammonium-free vanadium precipitation and one-step preparation of vanadium dioxide based on hydrothermal enhancement of organic alcohols 基于水热法增强有机醇的清洁无铵钒沉淀和一步法制备二氧化钒的创新工艺

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-10-04 DOI: 10.1016/j.apt.2024.104682

Kun Song , Jin Wang , Hang Su , Miao Liu , Rucheng Wang , Liwen Hu , Weizao Liu , Xuewei Lv , Yuntao Xin

As a transition metal oxide, VO₂ has excellent optical and electrical properties and is widely used in many fields. The production of VO₂ by the reduction of NH₄VO₃ and V₂O₅ will inevitably produce ammonia–nitrogen wastewater and NH₃ emission during the production of NH₄VO₃ and V₂O₅, which will cause serious environmental pollution and will increase economic costs. The large-scale and low-cost synthesis of VO₂ still faces great challenges. In this paper, VO₂(B) was successfully prepared by a one-step hydrothermal method using NaVO₃ as the vanadium source and CH₃CH₂OH as the reducing agent, and the optimal conditions for vanadium precipitation are as follows: vanadium concentration = 30 g/L, CH₃CH₂OH dosage = 20 % (percentage of solution volume), initial pH = 1, reaction temperature = 220 °C, reaction time = 12 h. The vanadium precipitation efficiency under the optimal conditions could reach 98.93 %, and the purity of VO₂(B) could reach 98.59 %. The precipitation products were characterized by XRD, TG, FTIR, XPS, and SEM-EDS. The mechanism of VO₂(B) preparation by ethanol reduction was proposed. This process is characterized by green, clean, and high efficiency. At the same time, the vanadium precipitation effect and vanadium precipitation products of various alcohols were studied to provide technical and theoretical support for the preparation of VO₂(B).

作为一种过渡金属氧化物，VO2 具有优异的光学和电学性能，被广泛应用于许多领域。通过还原 NH4VO3 和 V2O5 的方法生产 VO2，在生产过程中不可避免地会产生氨氮废水和 NH3 排放，造成严重的环境污染，增加经济成本。大规模、低成本合成 VO2 仍面临巨大挑战。本文以 NaVO3 为钒源，CH3CH2OH 为还原剂，采用一步水热法成功制备了 VO2(B)，钒沉淀的最佳条件为：钒浓度 = 30 g/L，CH3CH2OH 用量 = 20 %（占溶液体积百分比），初始 pH = 1，反应温度 = 220 ℃，反应时间 = 12 h。在最佳条件下，钒的沉淀效率可达 98.93%，VO2(B)的纯度可达 98.59%。对沉淀产物进行了 XRD、TG、FTIR、XPS 和 SEM-EDS 表征。提出了乙醇还原制备 VO2(B) 的机理。该工艺具有绿色、清洁、高效的特点。同时，研究了各种醇的钒沉淀效应和钒沉淀产物，为制备 VO2(B) 提供了技术和理论支持。

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引用次数: 0

Effects of excipient properties on pharmaceutical printlet fabrication via selective laser sintering 3D printing 辅料特性对通过选择性激光烧结三维打印技术制造药用打印件的影响

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-10-02 DOI: 10.1016/j.apt.2024.104678

Ayana Gotoh , Eriko Yamazoe , Takaaki Ito , Yoko Koide , Mayumi Yamada , Yasuhiro Shimada , Kohei Tahara

In this study, the impact of excipients on the quality of printlets manufactured using selective laser sintering (SLS) 3D printing was investigated. Various thermoplastic polymers, commonly used as pharmaceutical additives, and mannitol of different particle property grades, were used as excipients. SLS can produce complex structures and customize drug release rates; therefore, it can be used for personalized medicine. The significance of selecting suitable excipients, focusing on their powder flowability and printability, and their influence on the printlet properties was evaluated. An optimal amount of yellow iron oxide, a necessary laser-absorbing agent for printlet formation, was determined. Results revealed that excipients with optimal flow and shape characteristics considerably enhanced the printlet quality. The relation between the powder properties of excipients (internal friction angle, shear adhesion force, and flow function coefficient) and the SLS printing outcomes was evaluated using the powder shear cell test. The powder properties considerably affected the application of the powder layer using a spreader from the powder reservoir to the building platform. Moreover, the electron laser density impacted the printlet hardness. The as-fabricated printlets exhibited higher porosity and faster dissolution rates than traditional tablets, suggesting the potential advantages of using SLS in drug manufacturing.

本研究调查了辅料对使用选择性激光烧结（SLS）三维打印技术制造的打印件质量的影响。辅料采用了各种常用的热塑性聚合物和不同颗粒特性等级的甘露醇。SLS 可以生成复杂的结构并定制药物释放率，因此可用于个性化医疗。研究人员评估了选择合适辅料的意义，重点关注其粉末流动性和可印刷性，以及它们对印模特性的影响。确定了形成打印小片所需的激光吸收剂--黄色氧化铁的最佳用量。结果表明，具有最佳流动性和形状特征的辅料可大大提高打印小片的质量。使用粉末剪切池测试评估了辅料粉末特性（内摩擦角、剪切粘附力和流动功能系数）与 SLS 印刷结果之间的关系。粉末特性在很大程度上影响了使用撒粉器将粉末层从粉末储存器撒到构建平台上。此外，电子激光密度也会影响打印件的硬度。与传统片剂相比，制成的打印片具有更高的孔隙率和更快的溶解速度，这表明在药物生产中使用 SLS 具有潜在的优势。

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引用次数: 0

X-ray computed tomography (XCT) study of jetting in a fluidized bed: Measurement method development and single component fluidization 流化床喷射的 X 射线计算机断层扫描 (XCT) 研究：测量方法开发和单组分流化

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-10-01 DOI: 10.1016/j.apt.2024.104681

Xi Chen , Wenqi Zhong , Shuguang Liu , Theodore J. Heindel

Air injected into a fluidized bed through a perforated plate distributor may form individual jets above the distributor plate, which can have a significant impact on the gas–solid flow and heat/mass transfer in the dense phase region. Therefore, it is important to study the jetting characteristics in a fluidized bed, but the measurement of such jets is extremely challenging because of the opaque dense phase region. In this paper, an X-ray computed tomography (XCT) measurement system was constructed, and three-dimensional reconstruction software based on the cone beam filtered back projection algorithm (FDK) was implemented. A jet recognition and quantification algorithm was also developed and tested. Based on these methods, the influence of the jet velocity (U_j) and bed material size (d_p) on the structure and shape of the jets was studied. The results show that when the jet velocity increases, the average jet length (L), jet maximum diameter (D), and jet volume (V) increase, while the average jet half angle (θ) fluctuates around a constant value. Under the same jet velocity (U_j), the average jet length (L), jet maximum diameter (D), and jet volume (V) are inversely proportional to the bed material size (d_p), while the average jet half angle (θ) is directly proportional to the bed material size (d_p). Finally, a correlation for jet length (L) in a fluidized bed is proposed. This study provides a new characterization method for jetting in a fluidized bed, and offers unique experimental data for CFD model validation in fluidized bed simulations.

通过穿孔板分配器注入流化床的空气可能会在分配器板上方形成单独的射流，这可能会对稠密相区的气固流动和热量/质量传递产生重大影响。因此，研究流化床中的喷射特性非常重要，但由于稠密相区域不透明，测量这种喷射极具挑战性。本文构建了一套 X 射线计算机断层扫描（XCT）测量系统，并实施了基于锥束滤波背投影算法（FDK）的三维重建软件。此外，还开发并测试了一种射流识别和量化算法。基于这些方法，研究了射流速度（Uj）和床层材料尺寸（dp）对射流结构和形状的影响。结果表明，当射流速度增加时，平均射流长度 (L)、射流最大直径 (D) 和射流体积 (V) 会增加，而平均射流半角 (θ)则围绕一个恒定值波动。在相同的射流速度（Uj）下，平均射流长度（L）、射流最大直径（D）和射流体积（V）与床层材料尺寸（dp）成反比，而平均射流半角（θ）与床层材料尺寸（dp）成正比。最后，还提出了流化床中射流长度（L）的相关性。这项研究为流化床中的喷射提供了一种新的表征方法，并为流化床模拟中的 CFD 模型验证提供了独特的实验数据。

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引用次数: 0

The effect of cylinder structure on the pre-dusting of axial separator 筒体结构对轴向分离器预除尘的影响

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-10-01 DOI: 10.1016/j.apt.2024.104685

Shihang Li , Muze Han , Bo Ren , Xingyue Chen , Shuda Hu , Liang Yuan , Fubao Zhou

This study proposes a novel method using an axial separator as a pre-dusting device for a cartridge filter. The structural parameters with optimum dust removal performance were studied, and on this basis the distribution of pressure and air velocity fields inside the separator was analyzed. When the diameter of the cylinder increased to a certain value, the generation of vortex nuclei was eliminated, further improving the separation efficiency. Considering the requirements of the cartridge filter on the resistance and separation efficiency of the pre-dust removal device, it is appropriate to use #IV or #V axial separator (cylinder diameter of 40 mm, cylinder length of 100 and 120 mm, respectively). These separators exhibit resistance values of 417 Pa and 303 Pa, and separation efficiencies of 67.6 % and 63.9 % respectively, with #IV demonstrating superior efficiency in capturing small-sized dust particles. The study identifies the optimal structure of the pre-dusting device, guiding its design and implementation to reduce the operational load on the cartridge filter, extend cleaning cycles, and improve service life.

本研究提出了一种使用轴向分离器作为滤筒过滤器预除尘装置的新方法。研究了具有最佳除尘性能的结构参数，并在此基础上分析了分离器内部压力场和气流速度场的分布。当圆筒直径增大到一定值时，涡核的产生被消除，从而进一步提高了分离效率。考虑到筒式过滤器对预除尘装置的阻力和分离效率的要求，宜采用 #IV 或 #V 轴向分离器（圆筒直径分别为 40 毫米，圆筒长度分别为 100 毫米和 120 毫米）。这些分离器的阻力值分别为 417 Pa 和 303 Pa，分离效率分别为 67.6 % 和 63.9 %，其中 #IV 型分离器在捕获小尺寸尘粒方面表现出更高的效率。该研究确定了预除尘装置的最佳结构，指导其设计和实施，以减轻滤筒过滤器的运行负荷，延长清洁周期，提高使用寿命。

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引用次数: 0

3D CFD simulation of wet rough particles hydrodynamics in a pulsed fluidized bed using kinetic theory of rough spheres model 利用粗糙球体模型动力学理论对脉冲流化床中的湿粗糙颗粒流体力学进行三维 CFD 模拟

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-10-01 DOI: 10.1016/j.apt.2024.104680

Ruichao Tian , Jianlin Xie , Shuyan Wang , Xiaowei Li , Haoping Peng , Pengfei Yu , Yueming Guo

In the framework of kinetic theory of rough spheres (KTRS) model, a dynamic coefficient of restitution model is introduced to describe the collision behavior between wet rough particles in liquid. Based on the two-fluid model (TFM) combining kinetic theory of rough spheres, numerical simulations are conducted on the flow characteristic of rough particles and liquid in a pulsed fluidized bed. The simulation results are firstly validated against experimental data reported by Ehsani et al. Subsequently, the effects of pulsation flow on liquid–solid two-phase flow, particle collision and particle rotation behavior are studied. The results indicate that resonance fluidization occurs at a frequency of 1 Hz, which is approached to the natural frequency of the bed. Furthermore, the particle volume fraction increases with the pulsation amplitude at this frequency. Conversely, at a frequency of 36 Hz, the volume fraction exhibits the opposite trend with the pulsation amplitude. The interstitial fluid increases the dissipation of kinetic energy in particle collision, though its effect is much smaller than that caused by particle rotation.

在粗糙球体动力学理论（KTRS）模型的框架下，引入了动态恢复系数模型来描述湿粗糙颗粒在液体中的碰撞行为。基于结合粗糙球体动力学理论的双流体模型（TFM），对脉冲流化床中粗糙颗粒和液体的流动特性进行了数值模拟。模拟结果首先与 Ehsani 等人报告的实验数据进行了验证，随后研究了脉动流对液固两相流、颗粒碰撞和颗粒旋转行为的影响。结果表明，共振流化发生在频率为 1 Hz 时，接近床层的固有频率。此外，在该频率下，颗粒体积分数随脉动振幅的增加而增加。相反，在频率为 36 Hz 时，体积分数与脉动振幅呈相反趋势。间隙流体增加了颗粒碰撞动能的耗散，尽管其影响远远小于颗粒旋转造成的影响。

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引用次数: 0

Exploration of the formative mechanisms of colon-targeting composite particles of natural products prepared via mechanical dry particle coating 探索通过机械干法颗粒包衣制备的天然产品结肠靶向复合颗粒的形成机制

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-30 DOI: 10.1016/j.apt.2024.104648

Zekai Chen , Chenyi Yuan , Weiman Hong , Rong Xie , Liangliang Zhou , Yangbiao Li , Zhenhua Chen

Mechanical dry particle coating, coating fine particles in waterless environment, possesses great potential to prepare colon-targeting composite particles of natural products. However, host and guest particles physical properties may impact its surface coverage efficiency. This study selected 10 natural products and 4 colon-targeting excipients as host and guest particles, respectively, and characterized 13 physical properties. Using planetary ball mill, 40 composite particles were prepared and evaluated for SEM, infrared features, and in vitro release. Grey relation analysis, served as the core method, identified critical materials attributes of host and guest particle physical properties affecting the surface coverage and colon-targeting of composite particles. Results indicated that only 9 composite particles achieved favorable surface coverage and in vitro colon-targeting, like guar gum coated total saponins of Pulsatilla with respective surface area coverage and maximum cumulative drug release in colon of 76.71 % and 83.55 %, and revealed the prerequisite of well-covered structure of composite particle for colon-targeting. Identified critical material attributes, including particle size and specific surface area, etc., affected surface coverage efficiency through influencing interparticle forces for adhesion, particularly in van der Waals forces. Moreover, guest particle with favorable hydrophobicity may form a hydrophobic layer, preventing host particles from dissolving under well-covered structure.

机械干法颗粒包衣是在无水环境中对细小颗粒进行包衣，具有制备天然产品结肠靶向复合颗粒的巨大潜力。然而，主客体颗粒的物理特性可能会影响其表面覆盖效率。本研究选择了 10 种天然产品和 4 种结肠靶向辅料分别作为主颗粒和客颗粒，并对 13 种物理性质进行了表征。使用行星球磨机制备了 40 种复合颗粒，并对其进行了扫描电镜、红外特征和体外释放评估。以灰色关系分析为核心方法，确定了影响复合微粒表面覆盖率和结肠靶向性的主客体微粒物理性质的关键材料属性。结果表明，只有 9 种复合微粒达到了良好的表面覆盖和体外结肠靶向效果，如瓜尔胶包覆的白头翁总皂苷的表面覆盖率和结肠内最大累积药物释放率分别为 76.71% 和 83.55%，这也揭示了复合微粒的良好覆盖结构是实现结肠靶向的先决条件。已确定的关键材料属性，包括粒度和比表面积等，通过影响粒子间的粘附力，特别是范德华力，影响表面覆盖效率。此外，具有良好疏水性的客体粒子可能会形成疏水层，阻止主粒子在良好覆盖结构下溶解。

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引用次数: 0

Flotation separation scheelite from calcite by using a novel depressant of Poly(sodium 4-styrenesulfonate) 利用新型抑制剂聚（4-苯乙烯磺酸钠）从方解石中浮选分离白钨矿

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-27 DOI: 10.1016/j.apt.2024.104664

Jiali Chen, Peng Gao, Jie Liu, Yimin Zhu

Scheelite and calcite was firstly separated by new depressant Poly(sodium 4-styrenesulfonate) (PSS) with NaOL system. The recovery of scheelite was 87.18 % and the recovery of calcite was 5.57 % in single flotation experiments, the recovery and grade of WO₃ was 70.53 % and 61.08 % respectively in artificial mixed ore flotation under the optimal conditions of 10 mg/L NaOL, 10 mg/L PSS and pH of 8. Contact angle measurements, atomic force microscope (AFM) analysis, zeta potential analysis, fourier transforming infrared spectra (FT-IR) analysis and X-ray photoelectron spectroscopy (XPS) analysis were performed to uncover the reaction mechanism. The results showed that PSS could not adsorbed on scheelite by chemical reaction, and PSS had no impact on the further adsorption of NaOL onto the scheelite surface. Therefore, scheelite could still keep a high recovery with PSS. However, PSS could be strongly adsorbed on calcite by chemisorption between the Ca site of calcite and O site of PSS, which increased the hydrophilia of calcite and imped the further adsorption of NaOL. Therefore, it could selectively depress the flotation of calcite.

白钨矿和方解石首先通过新型抑制剂聚（4-苯乙烯磺酸钠）（PSS）与 NaOL 系统进行分离。在 10 mg/L NaOL、10 mg/L PSS 和 pH 值为 8 的最佳条件下，人工混矿浮选白钨矿的回收率为 87.18%，方解石的回收率为 5.57%；WO3 的回收率和品位分别为 70.53%和 61.08%。为揭示反应机理，还进行了接触角测量、原子力显微镜分析、ZETA 电位分析、傅立叶变换红外光谱分析和 X 射线光电子能谱分析。结果表明，PSS 不能通过化学反应吸附在白钨矿上，并且 PSS 对 NaOL 在白钨矿表面的进一步吸附没有影响。因此，白钨矿在使用 PSS 后仍能保持较高的回收率。然而，PSS 可通过方解石的 Ca 位点和 PSS 的 O 位点之间的化学吸附作用强力吸附在方解石上，从而增加了方解石的憎水性，阻碍了 NaOL 的进一步吸附。因此，它可以选择性地抑制方解石的浮选。

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引用次数: 0

Development of thermally stable, single-phased CaAl4O7:Dy3+ phosphor and a study on their down-conversion features for lighting applications 开发热稳定的单相 CaAl4O7:Dy3+ 荧光粉并研究其在照明应用中的下转换特性

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-27 DOI: 10.1016/j.apt.2024.104672

Rajashree Panda , Mitrabhanu Behera , Mahesha Hegde , R. Arun Kumar , R.K. Padhi , Anuradha M. Ashok , Neeraj Kumar Mishra , Kaushal Kumar

This investigation underscores the structural, optical and temperature-dependent photoluminescence characteristics of CaAl₄O₇:Dy³⁺-doped phosphor synthesized via microwave-assisted combustion synthesis route for the first time. The sample crystallizes in monoclinic structure affirmed by XRD analysis. Morphological behaviour was conducted via SEM analysis. The existence of functional groups was validated through FTIR study. Bandgap of the optimized sample was established as 4.11 eV from the UV–VIS absorbance spectra. The emission spectra possessed characteristic peaks of Dy³⁺ ion around 485 nm (blue), 576 nm (yellow) upon suitable excitation at 347 nm. The concentration of Dy³⁺ ion at x = 0.03 was established to be optimal. The CIE chromaticity co-ordinate of (x = 0.347, y = 0.427), correlated color temperature of 5109 K and color purity of 32.87 % were inferred. The PL decay time for CaAl₄O₇:Dy³⁺(x = 0.03) phosphor was obtained as 0.31 ms. Excellent thermal stability of the sample was established from the temperature-dependent PL analysis. To assess the lighting ability of the phosphor, phosphor-in-glass (P-i-G) material was fabricated. Superior luminous efficacy (428 lm/W) and luminous efficiency (62.66 %) were established for the fabricated P-i-G. The outcome vividly declares the potency of the CaAl₄O₇:Dy³⁺phosphor as a promising contender for n-UV excited phosphors for wLED applications.

这项研究首次强调了通过微波辅助燃烧合成路线合成的 CaAl4O7:Dy3+ 掺杂荧光粉的结构、光学和随温度变化的光致发光特性。XRD 分析证实，样品呈单斜结构。通过 SEM 分析进行了形态学研究。傅立叶变换红外光谱研究验证了官能团的存在。通过紫外-可见吸收光谱，确定了优化样品的带隙为 4.11 eV。在 347 纳米的适当激发下，发射光谱在 485 纳米（蓝色）和 576 纳米（黄色）附近出现了 Dy3+ 离子的特征峰。Dy3+ 离子的最佳浓度为 x = 0.03。推断出 CIE 色度坐标为 (x = 0.347, y = 0.427)，相关色温为 5109 K，色纯度为 32.87%。CaAl4O7:Dy3+(x = 0.03) 荧光粉的聚光衰减时间为 0.31 ms。根据随温度变化的 PL 分析，可以确定样品具有出色的热稳定性。为了评估该荧光粉的照明能力，制作了玻璃中的荧光粉（P-i-G）材料。所制造的 P-i-G 材料具有卓越的光效（428 lm/W）和发光效率（62.66%）。这一结果生动地表明，CaAl4O7:Dy3+荧光粉有望成为紫外激发荧光粉在白炽灯应用中的有力竞争者。

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引用次数: 0

Improving the removal of fine particles in cyclone using heterogeneous vapor condensation enhanced by atomization 利用雾化增强的异相蒸汽冷凝技术提高旋风分离器去除细颗粒的能力

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.apt.2024.104684

Teng Cheng, Jinxiang Wei, Hongwei Yu, Mingqing Tao, Minghao Mu, Bo Wang

Using a heat exchanger to cool high humidity flue gas can create a supersaturated water vapor environment, allowing fine particles to grow into large droplets by heterogeneous vapor condensation, which is conductive to the removal of fine particles by traditional equipment. However, due to the limited condensable vapor obtained by cooling, this technology can only be used in the flue gas with low particle concentration. In this study, atomization droplets were added before the heat exchanger to improve the effect of heterogeneous vapor condensation at high particle concentration, and then coupled with a cyclone separator, which was used for the deep treatment of the flue gas after the wet dedusting system. The particle removal characteristics were investigated through laboratory experiments and bypass experiments in a metallurgical company. The experimental results show that the application of atomization-heterogeneous condensation reduced the particles concentration after cyclone by 74.2 % compared with that of single heterogeneous condensation. Temperature-drop and atomized volume affected the removal of particles with size < 2 μm and > 2 μm, respectively. The industrial flue gas bypass experiment indicated that the system had strong adaptability to fluctuating conditions. When the inlet particle concentration did not exceed 2000 mg/Nm³, the outlet particle concentration can be maintained within 20 mg/Nm³.

使用热交换器冷却高湿度烟气可以创造一个过饱和的水蒸气环境，使细小颗粒通过异相水蒸气冷凝长成大液滴，有利于传统设备去除细小颗粒。但由于冷却获得的可冷凝水汽有限，该技术只能用于颗粒浓度较低的烟气中。本研究在热交换器前加入雾化液滴，以改善高颗粒浓度下的异相蒸汽冷凝效果，然后与旋风分离器耦合，用于湿法除尘系统后的烟气深度处理。通过实验室实验和某冶金公司的旁路实验，研究了颗粒物的去除特性。实验结果表明，与单一异相冷凝相比，雾化-异相冷凝的应用使旋风分离器后的颗粒浓度降低了 74.2%。温降和雾化体积分别影响了尺寸为 < 2 μm 和 > 2 μm 的颗粒的去除。工业烟气旁路实验表明，该系统对波动条件有很强的适应性。当入口颗粒浓度不超过 2000 mg/Nm3 时，出口颗粒浓度可保持在 20 mg/Nm3 以内。

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引用次数: 0

An experimental and theoretical validation of dual role of Fe on improving the photocatalytic performance of doped mixed phase titania 通过实验和理论验证铁对改善掺杂混合相二氧化钛光催化性能的双重作用

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.apt.2024.104683

S.K. Nikhil , Gopika Rajeev Nair , Abinash Das , Sebin Devasia , Ranjith G. Nair

The present work proposes a strategic approach of using Fe doping to form a mixed-phase TiO₂ direct Z-scheme catalyst at low onset temperature. The doping-induced modifications are explained from the experimental and theoretical viewpoint. Fe-doped Z-scheme-based mixed-phase TiO₂ at optimal calcination temperature (TiFe-400) exhibits maximum photon absorption and reduces charge carrier recombination, enhancing photocatalytic and PEC performance. TiFe-400 has the highest rate constant for the degradation of MB (0.084 min⁻¹ under solar irradiation) and showed exceptional photooxidation current (0.8 mA, 1.3 V vs Ag/AgCl). The Z-scheme formation significantly inhibits the recombination of photocarriers, resulting in a directed migration of charge carriers to the high redox potential mixed-phase TiO₂. This migration is validated by identifying the primary reactive species participating in the photocatalytic process. This work, demonstrating both experimental and theoretical approaches, may provide valuable insight into designing stable and inexpensive catalysts for dual applications on an industrial scale.

本研究提出了一种利用铁掺杂在低起始温度下形成混合相 TiO2 直接 Z 型催化剂的战略方法。从实验和理论角度解释了掺杂引起的改性。在最佳煅烧温度（TiFe-400）下，掺杂铁的 Z 型混合相 TiO2 表现出最大的光子吸收率，并减少了电荷载流子的重组，从而提高了光催化和 PEC 性能。TiFe-400 具有最高的甲基溴降解速率常数（在太阳光照射下为 0.084 min-1），并显示出优异的光氧化电流（0.8 mA，1.3 V 对 Ag/AgCl）。Z 型结构的形成极大地抑制了光载流子的重组，导致电荷载流子向高氧化还原电位的混合相 TiO2 定向迁移。这种迁移通过识别参与光催化过程的主要反应物得到了验证。这项工作同时展示了实验和理论方法，可为设计稳定、廉价的催化剂以实现工业规模的双重应用提供有价值的见解。

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引用次数: 0