查找使用阿拉丁产品的科研文献

Hierarchical diffusion pathways into VOC adsorption films by direct ink writing and ammonium carbonate treatment

Qiwei Chen,Zhuo Chen,Yan Wang,Enze Tian,Jinhan Mo

In-situ thermally restorable adsorption films exhibited brilliant performance for indoor volatile organic compounds (VOCs) purification with negligible wind resistance and considerable lifetime. However, the morphology of adsorption films should be restructured for better adsorption kinetics. This study structured adsorption films with submillimeter-sized channels by direct ink writing (DIW). Submicron-micron-sized porous structure was further fabricated through ammonia carbonate treatment. Pore size distribution characterization proved 33% of extra mesopores were created in the hierarchical porous adsorption film. Dynamic adsorption behaviours for formaldehyde and toluene illustrated that the hierarchical porous adsorption film exhibited an over 80% initial one-pass efficiency for both formaldehyde and toluene, improved by 20% over the plane adsorption film. The purification rate was also significantly improved by 83% and 67% for formaldehyde (from 0.059 mg g -1 h −1 to 0.106 mg g -1 h −1 ) and toluene (from 0.143 mg g -1 h −1 to 0.239 mg g -1 h −1 ), respectively. This study proposed a method for conveniently preparing multi-scale porous structured adsorption components under mild conditions. The hierarchical diffusion pathways induced by DIW and ammonium carbonate treatment will enhance the adsorption kinetics and the purification performance of the adsorption film, overcoming the weak purification performance and short material lifetime of the existing indoor VOCs adsorption components. This research can be further applied to gas separation, as well as gas sensing, as DIW can achieve sub-millimeter scale resolution, providing a versatile approach for heat and mass transfer enhancement in chemical and environmental fields.

Segmented Control of Selenization Environment for High-Quality Cu2ZnSn(S,Se)4 Films Toward Efficient Kesterite Solar Cells

Yue Jian,Litao Han,Xiangrui Kong,Tianliang Xie,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yuena Meng,Yafang Qi,Guangxing Liang,Xianghua Zhang,Zhi Zheng,Sixin Wu

High-crystalline-quality absorbers with fewer defects are crucial for further improvement of open-circuit voltage ( V OC ) and efficiency of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells. However, the preparation of high-quality CZTSSe absorbers remains challenging due to the uncontrollability of the selenization reaction and the complexity of the required selenization environment for film growth. Herein, a novel segmented control strategy for the selenization environment, specifically targeting the evaporation area of Se, to regulate the selenization reactions and improve the absorber quality is proposed. The large evaporation area of Se in the initial stage of the selenization provides a great evaporation and diffusion flux for Se, which facilitates rapid phase transition reactions and enables the attainment of a single-layer thin film. The reduced evaporation area of Se in the later stage creates a soft-selenization environment for grain growth, effectively suppressing the loss of Sn and promoting element homogenization. Consequently, the mitigation of Sn-related deep-level defects on the surface and in the bulk induced by element imbalance is simultaneously achieved. This leads to a significant improvement in nonradiative recombination suppression and carrier collection enhancement, thereby enhancing the V OC . As a result, the CZTSSe device delivers an impressive efficiency of 13.77% with a low V OC deficit.

High-Performance Flexible Gas Sensor Using Natural Rubber/MXene Composite for Selective and Stable VOC Detection

Na Kong,Ting Ren,Hui Yang,Mia Angela N. Judicpa,Ken Aldren S. Usman,Xu Zhao,Yanqiu Shao,Joselito M. Razal,Jinlong Tao,Jizhen Zhang

Flexible gas sensors are gaining interest for real-time volatile gas monitoring. A natural rubber (NR)/MXene nanocomposite sensor is developed. Among the six selected target volatile gases, the composite sensor exhibited a strong response value (82% toward 100 ppm NH 3 ) with the fastest response/recovery time (12.3 s/15.5 s) to NH 3 . The sensitivity showed a clear dependence of gases, suggesting a good selectivity to varying gases. Ti 3 C 2 T x MXene gas sensors exhibited a very low limit of detection of 50–100 ppb for volatile organic compounds (VOCs) at room temperature. In addition, the NR/MXene sensor allows detection of the mixture of ammonia (NH 3 ), dimethyl sulfoxide (DMSO), and acetone (C 3 H 6 O) and it shows good response depending on the total concentration of VOC gases. Furthermore, the flexible nanocomposite sensor exhibits stable sensing performance at different bending states (0-120°) and shows 20-day atmospheric stability. This sensor's ability extends to alcohol breath analysis, useful for drunk driving detection. This work paves the way to the possibility of using robust MXene-based toward practical realization of electronic devices.

Novel Oil-Absorbing Organogel for Asphalt Pavement: VOC Reduction, Mechanical Properties, and Environmental and Economic Influence

Song Li,Yiqiu Tan,Wei Luo,Huining Xu,Meizhao Han,Jilu Li,Shenqing Xiao

Asphalt materials release volatile organic compounds (VOCs) during construction, adversely impacting worker health and the environment. This study evaluated an oil-absorbing organogel as a VOC inhibitor to reduce VOC emissions along with its effects on the mechanical properties, environmental impact, and cost of asphalt materials. The oil-absorbing organogel was synthesized via addition copolymerization reaction of stearyl methacrylate (SMAL), ethylene glycol dimethacrylate (EGDMA), and styrene utilizing C=C bonds. The addition of the oil-absorbing organogel reduced VOC emissions from the asphalt mixture by up to 30%. On the other hand, the oil-absorbing organogel increased the deformation resistance and antifatigue performance by up to 85% and 25.2% while showing a slight decrease of the low-temperature performance at −6 °C below. In terms of the environmental influence, the asphalt mixture with 5% oil-absorbing organogel showed the biggest CO2, global warming potential (GWP), and acidification potential (AP), which were 12.2%,13.1%, and 6.2% higher than those without oil-absorbing organogel. The results of cost-benefit analysis of AC (asphalt mixture)-1, AC-3, and AC-5 were 20.5, 11.8, and 16.0, respectively. This indicated that the presence of oil-absorbing organogel has an obvious benefit. An appropriate oil-absorbing organogel enabled us to balance the VOC reduction, road performance, and environmental and economic influence. These findings provide feasible insight into promoting the use of VOC reduction materials in road engineering, balancing the VOC reduction effect, mechanical properties, and environmental and economic influence.

VOC elimination performance and mechanisms via ozone-based advanced oxidation processes coupled with micro-nano bubbling

Mei Dai,Liangkai Wu,Juncong Zou,Dexin Wang,Xiang Li,Shaohua Wu,Xinxing Zhou,Chunping Yang,Shanying He

Liquid-phase advanced oxidation processes (AOPs) offer a promising approach for enhanced VOC removal. However, hampered by low gas-liquid mass transfer efficiency and insufficient reactive oxygen species production, the efficient elimination of hydrophobic VOCs remains a challenge. This study evaluated the enhancement of aromatic hydrocarbon elimination from gas streams by adding H 2 O 2 or peroxymonosulfate (PMS) to ozone micro-nano bubbling (O 3 /MNB) technology. Results indicated that MNB increased the O 3 mass transfer coefficient (K L a) to 0.17 min −1 , 4.9 times that of conventional macrobubbling. Under an inlet load of (16 ± 0.8) g·m −3 ·h −1 and empty bed contact time (EBCT) of 45 s, adding H 2 O 2 or PMS markedly increased VOC removal. The O 3 /MNB/H 2 O 2 system achieved removal efficiencies of 86%, 83%, and 86% for benzene, toluene, and xylene, corresponding to elimination capacities of (13.76 ± 0.69), (13.28 ± 0.66), and (13.76 ± 0.62) g·m −3 ·h −1 , respectively. In the O 3 /MNB/PMS system, the removal efficiencies for these compounds were 91%, 80%, and 83%, with elimination capacities of (14.56 ± 0.73), (12.80 ± 0.64), and (13.28 ± 0.23) g·m −3 ·h −1 , respectively. Electron paramagnetic resonance (EPR), quenching tests, and probe experiments revealed that O 3 /MNB/H 2 O 2 system primarily utilized hydroxyl radicals (•OH) and singlet oxygen ( 1 O 2 ), whereas O 3 /MNB/PMS system employed •OH and sulfate radicals (SO 4 •- ). System optimization demonstrated that the O 3 /MNB/H 2 O 2 system showed optimal performance for moderate-to-low concentration waste streams under controlled pH, while the O 3 /MNB/PMS system exhibited superior adaptability for complex, high-concentration exhausts across broad pH ranges. This work provides a theoretical basis for industrial hydrophobic VOC treatment and insights into advanced low-temperature control technologies.

Efficient CZTSSe solar cells with the highest VOC of 591 mV enabled by thermal sputtering ITO

Liu Tong,Han Litao,Pei Lunan,Zhong Xinyi,Yang Wentong,Leng Kelin,Zeng Qiang,Kou Dongxing,Zhou Zhengji,Liu Fangyang,Wu Sixin

Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells suffer from significant open-circuit voltage ( V OC ) deficits due to severe interfacial and bulk recombination, restricting their power conversion efficiency (PCE) far below the Shockley-Queisser limit. This work proposes a low-temperature annealing strategy during ITO sputtering (SA) to synergistically address these challenges. The temperature applied during ITO sputtering not only improves the crystallinity, carrier concentration, and optical transmittance of the ITO layer but also promotes the diffusion of In from ITO into both CdS and CZTSSe layers. Consequently, lattice matching at the CZTSSe/CdS interface is optimized, enabling epitaxial growth. And a favorable ITO/In:CdS/In&Cd:CZTSSe structure with optimal band alignment is obtained. As a result, a champion device with a PCE of 14.29% was achieved. The SA-treating also enabled the CZTSSe solar cells to achieve the highest V OC reported to date, exceeding 590 mV. This underscores the essential role of SA processing in optimizing interface engineering and suppressing defects, thus promoting the development of low-cost, high-performance kesterite photovoltaics.

High-flux and anti-fouling membrane distillation membrane with VOC capture ability enabled by ZIF-8

Sheng Dafei,Li Xinlin,Huang Xin,Ma Dou,Sun Chao,Zhu Yuhao,Wang Xiaoqi,Wang Zhipeng,Feng Xiao,Zhao Shuang,Wang Bo

Seawater desalination and wastewater purification from brackish water, shale gas extraction, and industrial processes remain vital but challenging. Membrane distillation offers a promising solution yet struggles with low flux, membrane fouling, and the permeation of volatile organic compounds alongside water vapor. Here, we introduce an omniphobic ZIF-8 composite membrane that traps volatile organic compounds under vacuum through crystal phase transitions and enhances water evaporation via linkage swing within hydrophobic micropores. This membrane, with a 92% ZIF-8 loading, fabricated through thermally induced phase separation, hot-pressing, and surface coating, can process over 38,000 L of water with 10 ppm contaminants per square meter without needing reactivation. Achieving a normalized flux of 71.8 L m –2  h –1  bar –1 , it outperforms conventional membranes by fivefold in treating 10.5 wt% saline water, while maintaining excellent cyclic stability over 900 h and high anti-fouling properties. This work presents an effective approach for sustainable water purification.

Superacid catalyzed triptycene-based polymer to enhance membrane permeability for molecular sieving of nitrogen over VOC

Yuan Gao,Zhihao Huang,Wenyue Lv,Hua Zhang,Yuanqing Ye,Rongfei Zhou,Huiyun Liao,Haoli Zhou,Wanqin Jin

Superacid catalysis, a suitable method for the synthesis of membrane materials owing to its facile polymerization procedure, has been extensively studied. However, superacid-catalyzed binary coplanar polymer membranes generally exhibit low permeabilities. In this study, a rigid 3D triptycene-based polymer was synthesized by the superacid catalysis of triptycene with trifluoroacetophenone and diphenyl ether to enhance membrane permeability for the molecular sieving of nitrogen over volatile organic compound (VOC). The synthesis of polymers with (CF 3 PhET) or without triptycene (CF 3 PhE) was investigated using different characterizations. The triptycene content of the synthesized polymers was optimized based on an analysis of the molecular weight, membrane-forming properties, and separation performance. The separation performances of membranes fabricated using CF 3 PhE, CF 3 PhET, and a mixture of CF 3 PhE and triptycene were compared. Results showed that the introduction of non-coplanar triptycene in the membrane can increase permeability by nearly 60 times due to the enhanced free volume, from 30 Barrer for the CF 3 PhE membrane to 1755 Barrer for the membrane with 5 ​mol% triptycene content for the separation of a 3 ​mol% nitrogen/cyclohexane mixture at 1 ​L/(m 2 ·min). Furthermore, the rejection remains constant, which provides an effective idea for the synthesis of membrane materials with high performance using superacid catalysis.

Synthesis of triptycene-based linear polyamide membrane for molecular sieving of N2 from the VOC mixture

Shanyin Dai,Ruoxing Liao,Haoli Zhou,Wanqin Jin

In this study, triptycene-based carboxylic acid (triptycene-2,3,6,7-tetracarboxylic acid) was synthesized for polycondensation with two amino compounds to ultimately form linear polyamides with different backbone structures. Characterizations, including nuclear magnetic resonance (NMR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy, were performed to confirm the polycondensation, and the structural properties were determined. Solubility of the synthesized polyamides was also measured. Subsequently, these polyamides were fabricated into membranes to investigate the separation of N 2 over the VOCs, and their stability and separation performance under different operating conditions were determined. Good separation performance, such as a rejection rate above 95%, was obtained during the studied separation range for the N 2 /VOC mixture, indicating that a linear polymer can also be used for the separation of a condensable gas/vapor mixture and only the rotation of polymer chains can be restricted to a certain extent by the side groups.

Concentration Estimator of Mixed VOC Gases Using Sensor Array With Neural Networks and Decision Tree Learning

Zhiyun Chen,Yangong Zheng,Ken Chen,Hanyu Li,Jiawen Jian

Ultramicroporous Carbon Molecular Sieve for Air Purification by Selective Adsorption Low-Concentration CO2 and VOC Molecules

Yajun Wei,Tan Zhao,Jiawei Wang,Yanli Chen,Qiang Wang,Xizheng Liu,Yunfeng Zhao

The development of an ultramicroporous (<7 Å) adsorbent with a narrow pore distribution for capturing and adsorbing gas molecules has received a lot of attention. In this paper, the commercial carbon molecular sieve (CMS) was used as the precursor, and a carbon molecular sieve (CMS-A-5) with better performance was obtained by activating with potassium hydroxide (KOH). After activation, the ultramicroporous volume increased from 0.163 cm3 g–1 (CMS) to 0.329 cm3 g–1 (CMS-A-5), and the CO2 capacity increased from 42.76 to 71.92 cm3 g–1 at 298 K and 1 bar. The breakthrough experiments demonstrated that the CO2 capture ability of CMS-A-5 increased by ∼9.5 times for the respiratory air containing CO2/O2/N2 (4:20:76) and was easily regenerated and reused. CMS-A-5 was also capable of selectively capturing VOC molecules including benzene, toluene, and C8 alkyl aromatics (BTEX) with a high adsorption capacity at a low pressure. The excellent CO2 and VOC molecule adsorption capacity make CMS-A-5 a promising candidate for selective separation of the gas mixture, in particular, for air purification in confined spaces.

Design and Synthesis of a Water-Resistant Mesoporous Silica Gel for the VOC Adsorption–Desorption Treatment

Juan Li,Junxin Cai,Xiang Liu,Yurou Guo,Hong Sui,Lin He

Herein, to improve the water resistance of silica gel without sacrificing its adsorption capacity to volatile organic compounds (VOCs), the silica gel surface was modified by hydrophobic chemical groups, including methyl (–CH3), vinyl (–C2H3), and phenyl (–C6H5). After preliminary screening and optimization by molecular simulation, the optimal pore sizes and structures of the potential modified silica gel adsorbents were obtained. Based on the results of molecular design, a hydrophobic mesoporous silica gel has been successfully prepared by the co-condensation method with sodium silicate and phenyltriethoxysilane (PTES) as mixed precursors under acidic conditions. After systematic characterizations, it is found that the synthesized silica gel possesses a well-developed mesoporous structure (5.1 nm) and hydrophobicity. According to the adsorption tests to polar and nonpolar VOCs with humidity, it is observed that the humidity resistance of the synthetic adsorbent was significantly enhanced. For p-xylene, the adsorption capacity of Qwet/Qdry increased from 54.1 to 80.2% (Qdry and Qwet stand for the adsorption capacity under dry and wet conditions, respectively). Results also showed that the synthetic adsorbents possessed a high desorption rate (up to 89.7%) at the first recycling by vacuum desorption under wet conditions. The adsorption/desorption recycling tests proved the stability in adsorption capacity after five repeated cycles.