Journal of Cleaner Production
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2021
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IF 9.297
Bo Lv,Zeya Zhao,Xiaowei Deng,Chaojun Fang,Baolin Xing,Bobing Dong
The removal of copper ions from wastewater is of great significance for reducing pollution of surrounding environments and ensuring the quality of drinking water . In this study, a liquid–solid fluidized bed with nutshell activated carbon was used to adsorb copper ions from wastewater. The fluidization characteristics and adsorption performance of the liquid–solid fluidized bed were investigated through batch, cyclic, and continuous adsorption experiments. The results showed that nutshell activated carbon had a strong adsorption capacity for copper ions in wastewater by the electrostatic adsorption function of its oxygen-containing groups, and the adsorption isotherm was fitted by the Langmuir isotherm model ( R 2 reached 0.98), which indicated a positive single-layer adsorption. The pseudo-second-order model described the adsorption process well, and the adsorption process was controlled by a continuous migration step with internal and external diffusion. The high-frequency contact between adsorbent and adsorbate in the fluidized bed layer increased its external diffusion rate, thereby promoting improved adsorption efficiency of 96% compared with 76% of the packed bed. The weight of the particle bed was the factor influencing adsorption performance the most, followed by fluidization number, and then initial concentration, indicating that the fluidization characteristics determined the adsorption efficiency. The breakthrough curve showed that the adsorption saturations of the fluidized and packed bed were 0.694 and 0.660 g/g, respectively, which demonstrated the superiority of the fluidized bed in the adsorption process.
研究领域:
环境科学
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水处理工程
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DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Hanzi Liu,Yi Zhang,Haiming Wang,Changfu You
Selective non-catalytic reduction of NOx (SNCR) with NH 3 is commonly used in industrial facilities like circulating fluidized bed (CFB) furnaces. However, the strongly temperature-dependent de-NOx feature confines its applications in a specific temperature range (900–1050 °C). Here, we report a new strategy on using Fe-Ni-W exchanged zeolite (0.5FNW-H) as a catalyst to extend the SNCR temperature window. In the CFB reactor, a significant NOx conversion improvement ranging from 14.1% to 80.9% was achieved at 700 to 850 °C by applying the developed catalyst. Catalyst dosage of 4500 h −1 (GHSV), a particle diameter of 0.1–0.3 mm, and NH 3 injection position at the dense-phase zone were found preferred for NOx reduction with the highest efficiency of ~85% at 700 °C. The physicochemical properties of the catalysts remained stable after the circulating reactions in the CFB reactor. The developed catalyst is particularly applicable for improving the SNCR performance when the thermal power plants are operated at low loads.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yong Wei,Guijian Liu,Biao Fu,Ruwei Wang,Yuan Liu,Xuan Xue,Mei Sun
Inhalable fine particulate matter (PM), which is rich in Pb and other pollutants from coal-fired power plants, can cause air pollution and severe health problems. To facilitate the development of efficient techniques for controlling fine particulate Pb emissions, in this study, various types of size-resolved fine PM (<10.0 μm) were collected from the outlets of fabric filter units (FFs) at an industrial circulating fluidized bed (CFB) power plant to assess the distribution and partitioning behavior of Pb. The results showed that the mass particle size distribution (PSD) of the collected fine PM followed unimodal distribution, peaking at 5.8–4.7 μm, which might be caused by the fragmentation of limestone additives and new-formed CaSO 4 . However, the mass PSD of Pb for size-fractionated PM displayed different distribution pattern. Two peaks were observed in the size ranges of 5.8–4.7 μm and 1.1–0.7 μm. The mechanism of Pb enrichment in the supermicron particles was mainly controlled by the surface adsorption reaction, which could be explained by 1/d p dependence and be improved using excess active CaO produced by the injected limestone. For submicron particles, gas-film transfer or heterogenous condensation (mass transfer) might represent the deposition mechanism . Besides Pb enrichment, it was found that the submicron particles (<0.7 μm) mainly consisted of Si-rich and Si–Al phases. The emission of those fine SiO 2 -bearing particles should be limited as they can be inhaled and can damage the respiratory system.
研究领域:
环境科学
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公共卫生
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 3.7
Huijun Shang,Hengli Li,Weijun Li,Feng Pan,Zhan Du
In this paper, the effects of reaction parameters on the deep-reduction and carbonization process of WO 2 -Co to WC-Co were studied. The results indicate that oxygen loss rate of WO 2 is positively correlated with temperature and methane partial pressure. The partial pressure of methane has no significant effect on the formation rate of WC. The carbon content and particle size of the product increase with the increase of CH 4 partial pressure. By synergistically regulating the reaction temperature to 950 °C, methane partial pressure to 1.25%, and reaction time to 60 min, ultrafine WC-Co powder without η phase can be obtained. The particle size of the composite powder is 128 nm, with total carbon content of 6.16%, free carbon content of 0.4%, and residual oxygen content of 0.05%, respectively. The growth rate relationship of tungsten carbide is as follows:
研究领域:
材料科学
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化学工程
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Shuo Zhang,Zhen Liu,Shuran Li,Shihao Zhang,Hui Fu,Xuan Tu,Wenyi Xu,Xing Shen,Keping Yan,Ping Gan,Xiujuan Feng
This study proposed the fluidization-like dielectric barrier discharge (DBD) plasma for the remediation of lindane contaminated soil and integrated physical and chemical reaction pathway. Soil particle distribution within the reactor was simulated with Euler-Euler and Gidaspow drag models, and a bipolar pulsed power supply was applied to energize the DBD reactor after full fluidized. The effect of soil particles movement on electric features was discussed in terms of voltage waveforms and Lissajous figures. Lindane degradation was found to be related to electrics parameters and soil properties. Soil samples before and after treatment were analyzed by XRD and SEM methods. A 95.98% lindane decomposition and 0.66 mg Lindane /h average reaction rate were obtained with 3 wt% CaO injection by pulse power drove fluidization-like DBD after 32 min treatment. Ozone was proved to play a major role during lindane degrading by plasma. The reaction potential pathway of lindane decomposition contains 4 steps, including dehydrogen, dehydrochlorination, and dechlorination , respectively.
研究领域:
环境科学
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污染治理
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DOI
PubMed
高影响因子
Water
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2024
·Vol. 16
·期 12
·1690
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IF 3
Jingjing Yang,Jie Zhang,Jintong Liu,Quanxin Yang,Bingdang Wu,Xiaoyi Xu,Tianyin Huang
In order to recover the antimony from wastewater, a custom-designed fluidized-bed reactor (FBR) was employed to treat antimony-containing wastewater. By single-factor experiments, the effects of the solution pH, the molar ratio of [TA]/[Sb3+], the seed size and dosage, the up-flow velocity (U), and the hydraulic retention time (HRT) on antimony recovery were investigated based on the antimony removal and granulation efficiency. The optimum conditions for antimony recovery were obtained at pH 9.0, the molar ratio of [TA]/[Sb3+] of 2, 6 g/L of 13–38 μm Sb2O3as the fluidized seed, and the U and HRT of 42 m/h and 40 min, respectively; the antimony removal and granulation efficiency reached 95% and 91%, respectively. The granular products were analyzed by an X-ray polycrystalline diffractometer (XRD) and scanning electron microscopy (SEM) as cubic Sb2O3, widely used in various industries. The fluidized-bed reactor was operated continuously for 7 days, during which the antimony removal and granulation efficiency were stable at 96% and 93%, respectively. This study demonstrated the feasibility of the fluidized-bed granulation process for the recovery of antimony from wastewater. It provides a novel approach for retrieving and managing antimony-containing wastewater.
研究领域:
环境工程
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材料科学
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DOI
高影响因子
Particuology
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2021
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IF 3.067
Miao Song,Yafeng Yang,Hongdan Zhao,Maoqiao Xiang,Qingshan Zhu,Jibin Jia,Chaoquan Hu,Fen Yue
TiCl 2 is a promising precursor for producing metallic titanium alloys and titanium-based ceramics. However, the effective synthesis of high-quality TiCl 2 powder remains challenging. Herein, a fluidized bed reactor (FBR) providing a high gas–solid contact area was employed to synthesize TiCl 2 powder using a reliable TiCl 4 –Ti reaction system. Optimal reaction conditions (600 °C and 120 min) were determined for the proposed Ti–TiCl 4 system by kinetic investigation. A dense Ti layer was regenerated upon the original surface of the Ti powder as a result of TiCl 2 disproportionation at high temperature (above 700 °C), which impeded infiltration by gaseous TiCl 4 . The particle size of the Ti reducing agent played a vital role in the production of TiCl 2 powder. A mean particle size of 24.5 μm was confirmed to be the most feasible option based on the optimal chlorinated depth (17 μm).
研究领域:
材料科学
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化学工程
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DOI
高影响因子
FUEL
·
2023
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IF 7.4
Jiayong Ni,Jiaqi Si,Tian Lan,Weidong Sun,Guofeng Zhao,Ye Liu,Yong Lu
The fluidized-bed reactor is a preferred option for the design of an intrinsic-safety oxidative coupling of methane (OCM) process, because it permits such strongly exothermic reaction to proceed isothermally. However, the widely studied Mn-Na 2 WO 4 /SiO 2 catalyst cannot meet the requirements of the fluidized-bed reaction. Ground-breaking fluid catalyst coupling high activity/selectivity with good anti-agglomeration and high attrition resistance represents a grand challenge. Herein, we report an Mn 2 O 3 -Na 3 PO 4 /TiO 2 catalyst (280–355 μm) for the fluidized-bed OCM process, achieving 28.5% CH 4 conversion with 70.1% C 2 -C 3 selectivity at 760 °C for a feed gas of CH 4 /O 2 of 5/1 while remaining unchanged within 16 h test. This catalyst shows significant fluidization behavior under OCM reaction conditions. It is found that TiO 2 nanorods tangle up with each other to form an interpenetrating nano-structure thereby inducing strong mechanical strength and robustness with a low attrition index of only 2.8%. Moreover, high melting-point Na 3 PO 4 and use of TiO 2 support impart the catalyst to good anti-agglomeration because of eradication of formation of the sticky Na 2 Si 2 O 5 and molten Na 2 WO 4 (main cause for agglomeration) encountered in the Mn-Na 2 WO 4 /SiO 2 .
研究领域:
化学工程
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催化化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2024
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IF 4.2
Hengli Li,Huijun Shang,Feng Pan,Weijun Li,Zhan Du
This article investigated the preparation of ultrafine W powder by fluidized bed hydrogen reduction, and the apparent activation energy was determined for various reduction stages by using temperature programmed reduction with hydrogen. The results demonstrate that the introduction of Co 3 O 4 significantly enhances the reduction process of WO 3 .High Co 3 O 4 content can lead to the formation of CoWO 4 in the initial stage and obtain products with high content of Co 3 W. An increase in the Co 3 O 4 content correlates with a gradual decrease in the particle size of the product. The apparent activation energy for the WO 3 → WO 2 and WO 2 → W processes decreases as the Co 3 O 4 content increases. It can be decreased from 105.59 kJ /mol to 78.72 kJ/mol for the WO 3 → WO 2 stage, and from 107.38 kJ/mol to 78.38 kJ/mol for the WO 2 → W stage, respectively.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Hongtao Li,Haitao Yang,Jiaxin Cheng,Qingshan Zhu
Electroless plating is the main method for preparing metal-coated composite powders , such as Ni-coated graphite powders with wide applications in electromagnetic shielding materials, sealing coating, and electrocatalysis. However, the issues of uniform and dense coating during synthesis are hindering its practical implementation. Incorporating noble metals, such as Pd, to activate powders is a typical technique to prepare an electroless Ni coating. However, noble metal utilization is hindered by issues such as high costs and substantial wastewater. Herein, a novel low-cost and eco-friendly activation method based on fluidized bed hydrogen reduction is designed to prepare densely coated Ni@irregular graphite particles (Ni@IGP) using a low Ni content. This method can be used to construct a uniform and dense Ni coating for composite powders without acid alkali treatment and use of precious metals during the overall manufacturing process . Results demonstrated that the Ni@IGP particle obtained through this approach have good electrical conductivity and ferromagnetic properties. In addition, the uniformity and integrity of the Ni plating were adjusted, and the dense coating of graphite at a low Ni content of 35 wt% was effectively achieved. This new activation method sheds light on the field of electroless Ni plating on powders.
研究领域:
材料科学
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表面工程
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环境科学
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高影响因子
Microorganisms
·
2024
·Vol. 13
·期 1
·22
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IF 4.1
Hyun-Jin Kang,Hwan Hee Yu,Chang-Won Cho,Young Kyung Rhee,Tae-Wan Kim,Young-Wook Chin
Yeast formulations such as dry yeast are essential for supplying microbial starters to the alcoholic beverage industry. In Korea, the expensive freeze-drying method is used to manufacture brewer’s dry yeast, and therefore an economical process such as fluidized bed drying is needed. In the dry yeast manufacturing process, the medium and drying conditions are key factors that determine its quality and manufacturing cost. In this study, we aimed to optimize the medium composition and fluidized bed drying conditions for the efficient production of dry yeast. Muscovado and corn steep liquor were used as the carbon and nitrogen sources, respectively, and their optimal concentrations were identified using response surface methodology for efficient cultivation ofSaccharomyces cerevisiaeReY4-7 isolated fromnuruk. Central composite design analysis revealed that the optimal medium composition was 146.12 g/L muscovado and 58.68 g/L corn steep liquor. A dry cell weight of 36 g/L was achieved during 24 h of batch fermentation in a 30-L bioreactor containing this medium. Analysis of protective agents against fluidized bed drying revealed Span 80 as the strongest protective agent forS. cerevisiaeReY4-7. Response surface methodology revealed 50 °C and 41.45 min as the optimal fluidized bed drying conditions, under which the viable cell count reached 10.28 log CFU/g, comparable to that of the commercial dry yeast products. Overall, optimization of the medium and drying conditions significantly improved the final cell concentration in the cultivation process and the viable cell count in the drying process of dry yeast.
研究领域:
生物工程
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食品科学
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微生物学
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DOI
PubMed
高影响因子
Journal of Pharmaceutical Innovation
·
2025
·Vol. 21
·期 1
·16
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IF 2.7
Jia Chaoliang,Qu Jianlu,Liu Taoning,Wu Wei,Li wenlong
Objective This research intended to establish a curcumin nanosuspension micro-pellets (CUR-NSP) delivery system combining Hummer acoustic resonance (HAR) and fluidized bed coating technologies. Methods Polyvinylpyrrolidone K30 and sodium lauryl sulfate were employed as stabilizers to optimize and scale up the preparation of curcumin nanosuspension (CUR-NS) via HAR equipment. Using CUR-NS as the coating medium, the fluidized bed coating process for CUR-NSP was optimized through experimental design methodologies. Results First, this study prepared CUR-NS, which reduced the average particle size of raw curcumin from 5.38 ± 2.46 μm to 95.9 ± 0.46 nm. Under the optimal coating conditions, the redispersed CUR-NSP exhibited an average particle size of 104.86 ± 0.34 nm, a polydispersity index of 0.180 ± 0.002, a Zeta potential of -36.24 ± 0.80 mV, and a pellets yield of 97.14 ± 0.12%. Furthermore, this study evaluated the solidification efficiencies of fluidized bed coating, freeze drying, and rotary evaporation for CUR-NS. Structural characterizations via DSC, XRD, and FTIR confirmed the interaction between curcumin and stabilizers, along with partial amorphization. Saturation solubility tests demonstrated that CUR-NSP increases the solubility of curcumin in hydrochloric acid buffer solution at pH 1.2 and phosphate buffer solution at pH 6.8 by 2221.4 and 2761.89 times, respectively. In vitro dissolution tests indicated that CUR-NSP releases rapidly within 5 min. Conclusions The combination of HAR and fluidized bed coating enables an efficient and feasible approach for preparing CUR-NSP, addressing the issue of poor solubility.
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高影响因子
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