FUEL
·
2017
·
IF 4.601
Yiquan Guo,Junying Zhang,Yongchun Zhao,Shaolong Wang,Cheng Jiang,Chuguang Zheng
Fly ash fine particles emitted from coal-fired power plants are the primary atmospheric pollutant in China. The pressure, temperature, and velocity distribution of the flow field in a chamber was simulated to evaluate chemical agglomeration. The effect on the removal efficiency of composition, concentration, pH, K + content, and zeta potential of the chemical agglomeration solutions as well as surfactant and flue gas temperature were evaluated. The results suggested that suitable solutions could significantly improve the removal efficiency of fine particles. Among these, kappa-carrageenan performed best and achieved a removal efficiency of 47.1%. Synergism was detected as two different chemical agglomeration solutions were mixed together: a mixture of kappa-carrageenan and konjac glucomannan attained a removal efficiency of 59.3%, higher than their individual values. The efficiency improved initially and then decreased as the solution K + concentration increased. Also surfactants affected agglomeration: cationic and non-ionic surfactants enlarged the removal efficiency by 9.0% and 3.7%, respectively, whereas anionic surfactants lessened average removal efficiency by 5.6%. Zeta potential influenced the removal efficiency as well: it peaked as the zeta potential was around 0 mV.
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ENERGY & FUELS
·
2025
·
IF 5.3
Minghang Mao,Kefeng Yan,Chang Chen,Xiaosen Li,Zhaoyang Chen,Gang Li,Yi Wang
As a new type of clean energy, the exploitation of natural gas hydrate resources is key in global energy development of the future. A fundamental understanding of the heat transfer characteristics of natural gas hydrate reservoirs is critical for effective natural gas hydrate exploitation. In this work, the heat transfer characteristics of the sediments on marine natural gas hydrate reservoirs were investigated by using experiments and machine learning algorithms. The thermal conductivities of natural marine sediments from the marine natural gas hydrate reservoir and their primary porous media (quartz sand, Illite, and montmorillonite) were measured. The effects of the porous media component, the water content, the salt concentration, and the phase state change on the thermal conductivity of the reservoir were discussed. The experimental results show that the thermal conductivity of the reservoir depends not only on the inherent thermal conductivity of the porous media but also on the heat transfer mode between the components. The effective thermal conductivity of the porous media system is proportional to the water content and inversely proportional to the salt concentration in porous media. The swelling characteristics of porous media affect the heat transfer mode of the system, thus affecting the extent of change in the effective thermal conductivity with variations in the water content and salt concentration. During the phase transition process, the swelling characteristics of the porous media slow down the heat transfer process, an effect that can be mitigated by the swelling inhibition caused by salt. Additionally, the performances of six machine learning algorithms were evaluated using four evaluation indicators. Results show that the gradient boosted decision trees (GBDT) can yield good predicted values of the thermal conductivity of porous media in a marine natural gas hydrate. A feature importance analysis further reveals that the salt concentration and porous media components are the essential factors influencing the thermal conductivity of marine gas hydrate reservoirs.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Chengzhi Liu,Yanqi Zou,Kunmei Su,Zhenhuan Li
The emission of significant amounts of CO 2 from human industry has caused severe environmental damage, necessitating effective CO 2 capture methods for sustainable development. Membrane technology stands out as one of the most effective and economical solutions. In recent decades, polymer membranes have been recognized for their viability in gas separation applications. Aliphatic polycarbonates (APCs) are particularly notable due to their high chain segment flexibility, degradability, ease of processing, and the presence of carbonate groups, which enhance their affinity for CO 2 . This study uses a one-pot melt polycondensation process to synthesize three high-molecular-weight APCs: poly(1,4-butylene carbonate) (PBC), poly(1,5-pentamethylene carbonate) (PPC), and poly(1,6-hexamethylene carbonate) (PHC) from dimethyl carbonate and various diols. To improve the mechanical properties of the APC separation membranes, capping modification was applied. The molecular weights of PBC, PPC, and PHC were 6.48 × 10 4 g/mol, 4.78 × 10 4 g/mol, and 5.76 × 10 4 g/mol, respectively. These membranes were prepared by the evaporative solvent method. The PHC membrane demonstrated a CO 2 permeability of 20.84 Barrer and a CO 2 /N 2 selectivity of 22.24 at 35 °C under 0.1 MPa, approaching Robeson’s upper bound and indicating substantial potential for application.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jun Hu,Jiangzhou Luo,Yuxuan Zhao,Min Chen,Honglei Ling,Xiaoting Zhou,Song Xue
Constructing membranes that possess both exceptional gas transport property and strong resistance to CO 2 -induced plasticization is a crucial need in membrane separation , yet it still stands as an ongoing challenge. In present study, we firstly added the bromine atom into the 2, 2′-bis(trifluoromethyl)benzidine (TF) to synthesis two new bromine substituted diamines, and subsequently one of the brominated diamines was employed as a comonomer alongside commercial tris(4-aminophenyl)amine (TAPA) and dianhydride 6FDA to prepare the network polyimide (PI) membrane via copolymerization . Following this, these new brominated PIs would undergo debromination process during the subsequent heating treatment. As a result, the bromination/debromination effect created new microporosity , which increased the d-spacing and BET surface area of the membrane, thereby largely enhancing the crosslinked PI membrane’s gas separation performance. Moreover, the robust network structures achieved through in-situ crosslinking way, derived from a segment of trifunctional TAPA monomers , enhance the resultant membrane's resistance to CO 2 plasticization issue. An exemplified membrane referred to as 6 F-TA/TF-dBr-450 membrane displays outstanding CO 2 /CH 4 separation capabilities, with a CO 2 permeability of 1420.56 Barrer and a CO 2 /CH 4 selectivity of 39.67, surpassing the 2008 Roberson upper bound by a considerable margin. Besides, this membrane demonstrates outstanding durability against CO 2 -induced plasticization, showcasing its strength under pressures of at least 35 Bar.
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Arabian Journal of Chemistry
·
2024
·
IF 5.3
Jiyun Gao,Youyou Yin,Yongjing Guo,Lijuan Jia,Futing Xia,Chenhui Liu,Ming Hou,Fang Wang
NO 2 is a toxic gas that poses a significant threat to the environment and human health. In this work, one-dimensional ZnO nanowires and two-dimensional layered titanium carbide (Ti 3 C 2 T x ) have been prepared by hydrothermal and selective chemical etching methods, respectively. The Ti 3 C 2 T x /ZnO composites are synthesized by electrostatic self-assembly method. The characterization results indicate that the ZnO nanowires are uniformly dispersed on the surface of layered Ti 3 C 2 T x to form a heterostructure. Meanwhile, the gas sensitive performance of Ti 3 C 2 T x /ZnO composite material is investigated and compared with that of pure Ti 3 C 2 T x . The results reveal that the composite exhibits a high selectivity as well as sensitivity with a response value (S = Rg/Ra) of 18.66 to 100 ppm NO 2 at 250 ℃, which is 4.3 times higher than that of pure Ti 3 C 2 T x . This proves that the prepared composite material is an effective sensing material for detecting NO 2 gas.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-15
·
IF 15.7
Zhang Chunyu,Li An-Zhen,Yuan Bo-Jun,Liu Xiang,Liu Yuanbo,Kong Kejian,Shi Qiujin,Zhang Yixuan,Luo Yiqi,Li Shengnan,Zhou Hua,Duan Haohong
H 2 S capture and valorization from polluted natural gas offer environmental and resource recovery benefits, but current approaches produce moderate-value sulfur with intensive carbon footprint. Herein, we develop an electrochemical deep oxidation method that converts H 2 S from polluted natural gas into value-added K 2 SO 4 using in-situ cathodically generated H 2 O 2 . We first validate this concept using commercial H 2 O 2 and then in-situ generated H 2 O 2 in H-cell, revealing the importance of high H 2 O 2 concentration for deep H 2 S oxidation, especially sluggish S 2 O 3 2− -to-SO 3 2− conversion. We then showcase its application potential in 4-cm 2 and then 100-cm 2 flow reactor with high interfacial H 2 O 2 concentration and large current, with the latter achieving H 2 S removal (100,000 ppm to <15 ppm), >70% K 2 SO 4 selectivity, and 100-h stable operation. Life-cycle assessment and techno-economic analysis confirm the strategy’s sustainability advantages and economic viability. We finally extend this method to produce a 1.4 wt% H 2 SO 4 solution by modifying the flow reactor with a solid-electrolyte type.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hang Liu,Chanyu Yang,Jinkai Zhang,Runkang Lv,Yihao Wen,Yuhong Zhang
In this paper, a series of Eu-doped ZnSnO 3 nanoblocks are prepared through one-step hydrothermal method. The structure and morphology of Eu-ZnSnO 3 nanoblocks are characterised using SEM,XRD, XPS and TEM tests. The gas-sensitive properties of Eu-ZnSnO 3 nanoblocks towards isopropanol are explored. Compared with pure ZnSnO 3 , the response of 4 % Eu-ZnSnO 3 sensor is enhanced nearly three times. The response recovery time was greatly improved by Eu doping, and the 4 % Eu-ZnSnO 3 sensor showed a recovery time of only 8/10s for 100 ppm isopropanol at 260 °C, which is a 2.9-fold reduction in recovery time. The catalytic effect of Eu and n-n heterojunction structure of Eu 2 O 3 -ZnSnO 3 all contribute to enhance the gas response. The results prove that the Eu-ZnSnO 3 nanoblocks have great potential for the detection of isopropanol.
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CHIRALITY
·
2025
·Vol. 37
·期 8
·e70049
·
IF 3
Jia Huang,Yizhuo Ma,Maria Abbasi,Junzhe Qin,Mingxuan Li,Zi Yang,Xuran Sun,Wei Wang,Zhen Wang,Fang Liu,Luo Aiqin,Lina Geng
As enantiomers can have different pharmacological and toxicological impacts even though they have the analogous chemical composition, efficient chiral separation is crucial. Chromatography is one of the primary methods for separating enantiomers, and the key to chromatographic separation lies in the chiral stationary phase (CSP). Chiral porous materials have emerged as innovative chiral stationary phases and garnered extensive attention. Zr based MOF materials, have been regarded as one of the most stable metal–organic framework (MOF) materials. In this paper, after grafting with L-proline, UiO-66 was used for the first time for chiral gas chromatography separation. The newly developed CSP provided high resolution for xylenes within only 2–3 min. For substances like linalool, α-pinene, and xylenes, the UiO-66-NH 2 -L-Pro–coated capillary column acquired bas3ic resolution and showed outstanding enantiomeric and positional isomer isolation. Comprehensive characterizations, including SEM, XRD, FT-IR, TGA, N 2 adsorption–desorption isotherms, CD spectra, and XPS, were conducted to analyze the material stucture and chiral recognition mechanism. The chiral separation relies on transient diastereomeric complexes formed between L-proline and enantiomers, stabilized by hydrogen bonding, intermolecular forces, and steric constraints within UiO-66's micropores. These interactions enforce enantioselective discrimination via the pore's stereochemical filtering, enabling chiral resolution. This study is expected to provide significant value for both chromatographic chiral separation and large-scale chiral substance separation.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 7
·1-11
·
IF 5.3
Zhao Zhihua,Yao Longqi,Zhang Shuaiwen,Shi Qingsheng,Rahmatullah Abu Bakker Md,Wu Lan
Industrialization and agricultural demand have both improved human life and led to environmental contamination. Especially the discharge of a lot of poisonous and harmful gases, including ammonia, ammonia pollution has become a pressing problem. High concentrations of ammonia can pose significant threats to both the environment and human health. Therefore, accurate monitoring and detection of ammonia gas are crucial. To address this challenge, we have developed an ammonia gas sensor using In(OH) 3 /Ti 3 C 2 T x nanocomposites through an in-situ electrostatic self-assembly process. This sensor was thoroughly characterized using advanced techniques like XRD, XPS, BET, and TEM. In our tests, the I/M-2 sensor exhibited remarkable performance, achieving a 16.8% response to 100 ppm NH 3 at room temperature, which is a 3.5-fold improvement over the pure Ti 3 C 2 T x MXene sensor. Moreover, it provides swift response time (20 s), high response to low NH 3 concentrations (≤ 10 ppm), and excellent long-term stability (30 days). These exceptional characteristics indicate the immense potential of our In(OH) 3 /Ti 3 C 2 T x gas sensor in ammonia detection. Graphical Abstract
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhiwei Wang,Xiang Zhao,Fangzhen Hong,Hao Wang,Heng Lei,Zhiming Chou,Jiandong Zheng
The development of room-temperature (RT) formaldehyde sensors is significant for indoor air quality monitoring. In this contribution, titanium (Ti)-incorporated 1T/2H molybdenum disulfide (MoS2) phase heterostructures were prepared via a facile hydrothermal method. Compared with 1T/2H MoS2, the as-prepared 1T/2H Mo1–xTixS2 nanosheets showed a boosted RT formaldehyde sensing performance, which was attributed to the enhanced gas adsorption and charge transfer processes induced by Ti incorporation and could be regulated by tuning the Mo/Ti ratio in Mo1–xTixS2. In addition, the Ti-incorporated phase heterostructures with an optimized 1T concentration showed further improved gas-sensing properties compared to the highly metallic or semiconducting nanosheets with the same chemical composition, which exhibited an obvious response of 0.035% to 1 ppm formaldehyde with an excellent limit of detection as low as 39 ppb, good repeatability, and short response and recovery times. Moreover, flexible gas sensors based on the optimized nanosheets showed well-maintained responses under moderately bent conditions. Our findings demonstrate that the creation of phase heterostructures with tunable compositions and phases may provide more opportunities to tailor their sensing properties.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Hairui Fang,Hong Chen,Feng Zhang,Rong Tan,Chenshuai Han,Xin Ai,Xiao Ma,Yiwen Cui,Dong Wang
Sulfur hexafluoride (SF 6 ) from Gas Insulated Switchgear (GIS) will decompose and produce hydrogen sulfide (H 2 S) in the event of equipment failure. Therefore, the detection of H 2 S can determine whether the equipment has malfunctioned. Due to the low concentration of the SF 6 decomposition product H 2 S and its application in industrial environments, sensors must have a low detection limit and rapid response time . Considering that the oxides of rare earth elements can improve the sensing characteristics, praseodymium oxide (Pr 6 O 11 )-indium oxide (In 2 O 3 ) was prepared. The impact of Pr 6 O 11 doping on In 2 O 3 was investigated through characterization methods. To validate its feasibility for use in GIS, the best sensor (F3) exhibits good sensing characteristics for H 2 S in the SF 6 and air ambient. The responses to 10 parts per million (ppm) H 2 S at 190°C were 146.6 in SF 6 and 190.8 in air. In SF 6 ambient, the F3 sensor demonstrated a low detection limit (50 parts per billion (ppb)). The good sensing characteristics are attributed to the doping of rare earth elements, which induces an increase in the proportion of defect oxygen and accelerate the chemical reaction. The sensing characteristics of the material can be attributed to the doping of Pr 6 O 11 and the electronic effect. This study provides a novel approach for detecting H 2 S generated from SF 6 decomposition.
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ADVANCED MATERIALS
·
2020
·Vol. 32
·期 22
·1907701
·
IF 27.398
Bo Wang,Zhihua Qiao,Jiayou Xu,Jixiao Wang,Xinlei Liu,Song Zhao,Zhi Wang,Michael D. Guiver
Ultrathin unobstructed gas transport channels through the membrane selective layer are constructed in mixed matrix membranes (MMMs) by using gravity-induced interface self-assembly of poly(vinylamine) and polymer-modified MIL-101(Cr). For CO 2 /N 2 (15/85 by volume) mixed gas, the MMMs achieve a high CO 2 permeance of 823 gas permeation units and CO 2 /N 2 selectivity of 242 at 0.5 MPa. Based on economic analyses, a two-stage membrane process can achieve gas separation and economic targets.
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