CRYSTENGCOMM
·
2022
·Vol. 24
·期 42
·7420-7426
·
IF 3.756
Mingming Ruan,Anqi Li,Yaping Wen,Lian Zhou,Jun Zhang,Xiaopeng Xuan
Ammonia capture is of great importance to environmental protection and resource conservation. In this work, two isoreticular bio-MOFs, namely, Zn(3-AIN)(AD)·DMF and Zn(3-AIN)(AD)·DMA, were constructed with inexpensive, easily available and low-toxicity/non-toxic ligands and Zn2+ in different solvents, respectively. They possess 1D channels decorated by four free amine groups and N atoms from pyrimidine rings and can retain their crystallinity and porosity even after soaking in boiling water for 4 hours and in aqueous solution with various pH values ranging from 1 to 14. These two bio-MOFs can serve as promising sorbents for NH3, exhibiting a large uptake of about 7–10 mmol g−1 at 1 bar.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Baoyou Liu,Jie Tian
The efficient and environmentally friendly recovery and separation of ammonia (NH3), as a toxic substance in the environment and an indispensable chemical raw material, has always been a challenge. In the present work, natural deep eutectic solvents (DESs) based on dual solid components of glycolic acid (GA) and xylitol (XYL) were designed and synthesized as absorbents to capture ammonia efficiently and reversibly. The results showed that DESs exhibited ideal physical properties, high NH3 absorption capacity, and high NH3/CO2 selectivity. At 303.15 K and 101.33 kPa, the absorption capacity of GA+XYL (3:1) for NH3 is as high as 0.225 g NH3·(g DES)−1, which is much higher than those of ionic liquids and DESs reported so far. DES absorbs NH3 with high reversibility and can represent high absorption performance after five absorption–desorption cycles. In addition, the intrinsic absorption mechanism was analyzed using spectral characterization and quantum chemical calculation. These protic DES-based GA and XYL with high efficiency and reversible NH3 capture are expected to be promising substitutes for ammonia absorbents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yuan Cheng,Sheng Zhou,Kunfeng Zhao,Fawen Wu,Dechun Huang,Hongliang Qian
Although deep eutectic solvents (DESs) are green ammonia capture solvents with simple synthesis and easy availability of raw materials, their absorption rate is limited due to inherent high viscosity barrier. Herein, a high-viscosity hybrid DES (choline chloride/resorcinol/glycerol = 1:3:5, CRG) was encapsulated in a highly permeable shell of polydimethylsiloxane (PDMS) by microfluidics. The absorption capacity and absorption rate of the 550 μm Microcapsule were found to be 1.45 and 6.01 times higher than that of unpacked CRG respectively for the increased mass transfer area of CRG. Additionally, the 550 μm Microcapsule maintained 93 % of its initial maximum absorption capacity after 8 cycles. Moreover, a model of mass transfer resistance 1 / k μ based on chemical potential into the ammonia absorption rate formula was established. Then 1 / k μ related to the sizes of microcapsules was proposed based on the observation that there is a certain linear relationship between d m NH 3 / d t and l n ( x NH 3 , e / x NH 3 , t ) , based on which, mass transfer enhancement mechanism was analyzed. This study is the first to extend the concept of microencapsulation to the field of ammonia capture, which has a certain guiding role for other gases capture research.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 7
·526
·
IF 4.3
Wenshuo Pan,Shaojuan Zeng,Jiang Chang,Guilin Li,Wei Zhang,Xiangping Zhang
Recently, low-concentration ammonia (NH3) capture has attracted considerable attention for applications in ammonia–hydrogen fuel cells and confined spaces. The main objective of this study was to develop novel ultramicropore ionic liquid-supported aerogel composites (UILACs), designed to effectively expose the multiple hydrogen bonding sites of the ionic liquid through the constructed ultramicropore structure in order to capture and selectively separate low-concentration NH3. UILACs achieved a maximum NH3capacity of 164.69 mg NH3/g absorbent at 25 °C and 0.10 MPa, which was 3.47 times higher than that of the pure aerogel. In breakthrough experiments with low NH3concentrations (1000–10,000 ppm), UILACs exhibited exceptional NH3/H2and NH3/N2selectivity of 2460 and 10,474, respectively, at 1000 ppm NH3, values which are 31.5 and 22.1 times higher than the pure aerogel. These values significantly exceeded those of aerogels, owing to high hydroxyl ammonium ionic liquid (HAIL) loading, interactions between HAIL and NH3, and ultramicropores, as confirmed by density functional theory (DFT) calculations and isothermal analysis. Furthermore, UILACs maintained stable adsorption performance through ten adsorption–desorption cycles, demonstrating UILACs’ potentials for efficient NH3capture and separation in energy applications.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Junhui Zhang,Kuiling Li,Mengfei Xie,Qi Han,Li Feng,Dan Qu,Liqiu Zhang,Ke Wang
To unravel the low membrane fouling tendency and underlying membrane fouling mechanism of liquid-liquid hollow fiber membrane contactor (LL-HFMC) capturing ammonia from human urine, the ammonia flux decline trend, membrane fouling propensity, foulant-membrane thermodynamic interaction energy and microscale force analysis at different feed urine pH were comprehensively investigated. The 21-d continuous experiments showed that the ammonia flux decline trend and membrane fouling propensity significantly strengthened with the decrease of feed urine pH. The calculated foulant-membrane thermodynamic interaction energy decreased with the decreasing feed urine pH and agreed with the ammonia flux decline trend and membrane fouling propensity. The microscale force analysis showed that the absence of hydrodynamic water permeate drag force resulted in the foulant located at long distance from the membrane were difficult to approach the membrane surface, thus considerably alleviating membrane fouling. Additionally, the vital thermodynamic attractive force near the membrane surface increased with the decrease of feed urine pH, which made the membrane fouling further relieved at high pH condition. Therefore, the absence of water permeate drag force and operating at high pH condition minimized the membrane fouling during the LL-HFMC ammonia capture process. The obtained results provide a new insight into the low membrane tendency mechanism of LL-HFMC.
研究领域:
环境工程
·
膜技术
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）