JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Huang Ouyang,Li Guo,Cao Li,Xueqin Chen,Bingbing Jiang
Advanced porous organic materials with high gas storage capacity and high selectivity have been rapidly developed for CO 2 adsorbents in the recent decade, due to extremely high surface area and nanoscale pore size. Here, novel amino acids-incorporated solid adsorbents based on porous hypercrosslinked polymers were fabricated by a dispersion polymerization of an aromatic monomer and quaternary ammonium salt comonomer, subsequently a hypercrosslinked reaction and an ion-exchange step. The developed adsorbents presented mesopores structure with BET surface area up to 864 m 2 /g and an extremely high CO 2 capturing capacity up to 60.7 wt% (13.8 mmol/g) at 273 K/1 bar. The results also showed the adsorbent had an excellent recycling ability over repetitive adsorption-desorption cycles. All the results suggest that the amino acids-modified porous sorbents are promising CO 2 sorbents that can meet the challenges of the current CO 2 capture and storage technology.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Xinru Zhang,Tao Zhang,Yonghong Wang,Jinping Li,Chengcen Liu,Nanwen Li,Jiayou Liao
Mixed-matrix membranes (MMMs) for CO 2 /N 2 separation were prepared by incorporating nickel-substituted ZIF-8 (Zn/Ni-ZIF-8) into a polyether-block-amide (PEBA2533) polymer, in which the Zn and Ni ions in Zn/Ni-ZIF-8 have different affinities for CO 2 based on π-complexation; these MMMs exhibited exceptional molecular sieving properties compared to ZIF-8-PEBA MMMs. Scanning electron microscopy revealed that Zn/Ni-ZIF-8 nanoparticles were small and uniformly distributed within the PEBA, and attenuated total reflectance Fourier-transform infrared spectroscopy revealed good interfacial compatibility between the Zn/Ni-ZIF-8 and PEBA; consequently these MMMs exhibited excellent mechanical properties . The 10% Zn/Ni-ZIF-8-PEBA MMM showed a high CO 2 permeability of 321 Barrer, and a CO 2 /N 2 selectivity of 42.8 at 2 bar; these values were much higher than those of the 10% ZIF-8-PEBA MMM (266 Barrer and 33.8, respectively). We assume that different metal-ion affinities towards CO 2 resulted in the asymmetric adsorption/desorption behaviour of these MMMs, which led to a significantly higher permselectivity for the Zn/Ni-ZIF-8-PEBA MMM. The MMM loaded with 10% Zn/Ni-ZIF-8 exhibited long-term CO 2 -separation-performance stability under mixed-gas conditions, with a CO 2 permeability of 282 Barrer and a CO 2 /N 2 selectivity of 42.7. Moreover, the permselectivity of the 10% Zn/Ni-ZIF-8-PEBA MMM under pure-gas condition surpassed Robeson's upper bound reported in 2008.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2018
·Vol. 20
·期 30
·19900-19905
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IF 3.906
Caili Dai,Qianru Yang,Mingwei Gao,Mingwei Zhao,Jianfeng Jiang
To indicate the difference between pH and CO2 stimuli mechanisms, a dual responsive system is constructed with the aid of N-[3-(dimethylamino)propyl]docosanamide (NDPD) and sodium salicylate (NaSal), which is responsive to pH and CO2. The dual responsive system is characterized by rheometry, cryo-TEM and 1H NMR spectroscopy. After bubbling CO2 or adjusting the pH, the rheological properties indicate the formation of wormlike micelles. The cyro-TEM images also confirmed wormlike micelles. The effect of temperature is also clarified. By comparing the rheological properties of the wormlike micelles with pH and CO2 stimuli conditions, combined with cryo-TEM and 1H NMR results, the stimuli mechanisms of pH and CO2 to the dual responsive system are shown. Through this work, we expect to deepen our understanding of the responsiveness of a self-assembled system.
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JOURNAL OF SUPERCRITICAL FLUIDS
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2018
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IF 3.122
Lei Song,Ziqian Lin,Yafei Zhao,Xiaohui Hu,Yanzhen Hong,Yuzhong Su,Hongtao Wang,Jun Li
In this work, a facile route was designed to fabricate bimodal porous silica with high surface area and pore volume via a CO 2 -expanded gelation with assistance of CTAB. Parameters such as the amount of CTAB, pressure of CO 2 and agitation time were investigated and optimized. Results showed bimodal silica contained small pore size (around 2 nm) from CTAB templating and large pore size (> 4 nm) from CO 2 -expanded gelation could be easily adjusted by the synthesis conditions. A typical sample with surface area of 1133 m 2 /g and pore volume of 1.24 mL/g was applied as a catalyst support for phosphotungstic acid, revealing much faster catalysis rate and relatively high selectivity for 1, 8-cineole from α-terpineol than the commercial MCM-41. The approach was also successfully extended to the preparation of bimodal NiO/silica composite, and the reduced Ni/silica showed higher catalysis performance than the unimodal sample for phenol hydrogenation to cyclohexanol.
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NANOTECHNOLOGY
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2019
·Vol. 30
·期 39
·394001
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IF 3.399
Qijie Mo,Liuqing He,Jiachang Zeng,Qingsheng Gao
Exploring noble-metal-free electrocatalysts for the hydrogen evolution reaction (HER) is a key issue in a hydrogen economy blueprint. As one of the promising candidates, transition metal phosphides unfortunately suffer from inevitable surface oxidation which obstructs active-site exposure. Herein, a facile reduction followed by a surface phosphorization is introduced to convert surface-oxidized cobalt phosphides to a Co2(P2O7)-CoP heterostructure embedded in N-doped carbon (Co2(P2O7)-CoP/NC), accomplishing an efficient HER in both acidic and alkaline electrolytes. It affords low overpotentials (η10) of 88 and 97 mV to reach a current density of −10 mA cm−2, and small Tafel slopes of 51 and 61 mV dec−1 in 0.5 M H2SO4 and 1.0 M KOH, respectively, outperforming the parent surface-oxidized Co2P and most previously-reported Pt-free electrocatalysts. The remarkably improved electrocatalysis should be ascribed to the strong surface acidity of the Co2(P2O7) component and thereby the promoted HER kinetics on Co2(P2O7)-CoP interfaces. This work will encourage the development of cost-efficient electrocatalysts via surface engineering.
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AICHE JOURNAL
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2018
·Vol. 64
·期 7
·2515-2525
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IF 3.326
Helei Liu,Moxia Li,Xiao Luo,Zhiwu Liang,Raphael Idem,Paitoon Tontiwachwuthikul
In this work, Diethanolamine (DEA) was considered as an activator to enhance the CO 2 capture performance of Monoethanolamine (MEA). The addition of DEA into MEA system was expected to improve disadvantages of MEA on regeneration heat, degradation, and corrosivity. To understand the reaction mechanism of blended MEA-DEA solvent and CO 2 , 13 C nuclear magnetic resonance (NMR) technique was used to study the ions (MEACOO - , DEACOO – , MEA, DEA, MEAH + , DEAH + , , ) speciation in the blended MEA-DEA-CO 2 -H 2 O systems with CO 2 loading range from 0 to 0.7 mol CO 2 /mol amine at the temperature of 301 K. The different ratios of MEA and DEA (MEA: DEA = 2.0:0, 1.5:0.5, 1.0:1.0, and 0:2.0) were studied to comprehensively investigate the role of DEA in the system of MEA-DEA-CO 2 -H 2 O. The results revealed that DEA performs the coordinative role at the low CO 2 loading and the competitive role at high CO 2 loading. Additionally, the mechanism was also proposed to interpret the reaction process of the blended solvent with CO 2 . © 2018 American Institute of Chemical Engineers AIChE J , 64: 2515–2525, 2018
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2015
·
IF 1.098
Wei Wang,Zhi Yun,Zhigang Tang,Xia Gui
The binary vapor–liquid equilibrium data of CO 2 in diethylene glycol (monomethyl, monoethyl, monobutyl, dimethyl, diethyl, dibutyl) ether were determined from 288.15 to 318.15 K at pressure up to 6 MPa based on the constant-volume method. It was found by contrast that the ether group in solvents can promote the CO 2 absorption, but the hydroxyl group will inhibit the CO 2 absorption. Furthermore, the solubilities of CO 2 showed an upward trend with the increasing molecular lengths of absorbents. The experimental data were also correlated with a modified Patel–Teja equation of state (PT EOS) combined with the traditional van der Waals one-fluid mixing rules and the results showed a satisfactory agreement between the model and the experimental data.
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POLYMER ENGINEERING AND SCIENCE
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2013
·Vol. 54
·期 1
·59-63
·
IF 1.243
Guangren Yu,Qingzeng Li,Na Li,Ziwei Man,Chenghao Pu,Charles Asumana,Xiaochun Chen
A new poly(ionic liquid) of N , N -methylenebisacrylamide (MBA)-crosslinked-poly(4-vinylbenzyltriethylammonium hexafluorophosphate)(MBA-crosslinked-P[VBTEA][PF 6 ]) is prepared through the ion exchange of KPF 6 with the precursor of MBA-crosslinked-P[VBTEA][Cl]; the precursor is synthesized by 4-vinylbenzyltriethylammonium chloride and MBA via inverse suspension polymerization. MBA-crosslinked-P[VBTEA][PF 6 ] is a thermally stable (decomposes at nearly 300°C) and porous (apparent porosity of 64.3% and specific surface of 39.12 m 2 /g) polymer particle with high purity, as indicated by Fourier transformed infrared, energy dispersive spectroscopy, thermogravimetric, scanning electron microscopy, and porous analyses. It is observed that MBA-crosslinked-P[VBTEA][PF 6 ] has good CO 2 adsorption capability of 14.04 mg/g at 0.2 MPa and 25°C, and can be recovered by desorption at vacuum and 80°C, and reused with 99% CO 2 adsorption after four cycles. POLYM. ENG. SCI., 54:59–63, 2014. © 2013 Society of Plastics Engineers
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CHEMICAL ENGINEERING SCIENCE
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2013
·
IF 2.386
Zhen Wang,Mengxiang Fang,Yili Pan,Shuiping Yan,Zhongyang Luo
A novel membrane vacuum regeneration (MVR) technology was developed to achieve lower regeneration energy demand for CO 2 absorption process. Sixteen different amine-based absorbents including primary, secondary, tertiary amines, polyamines, diamines, and sterically hindered amines were analyzed by combined absorption–desorption screening experiments for selecting the most effective absorbents for CO 2 membrane vacuum regeneration (MVR) technology. The CO 2 absorption experiments were conducted in a hollow fiber membrane contactor (HFMC) at 25 °C and 12.5 kPa CO 2 partial pressure. The CO 2 rich solvent was regenerated at 75 °C and 20 kPa regeneration pressure by using the MVR technology. The chain length, number of functional groups, side chain, and number of hydroxyl groups of amines were investigated to get a better understanding on the effects of the structure in the MVR process. The results show that the tertiary amines have greater regeneration performances than the primary amines, but the CO 2 absorption rates of the tertiary amines are worse than the primary amines. For the polyamines, the absorption performance of polyamines can be improved by increasing the number of amine groups while the MVR performance of the polyamines can be reduced. Steric hindered amines exhibited greater MVR performances. In addition, amines with steric hindrance effect caused by the substitution of hydroxyl group or methyl group to amine group in structure has also shown good performance in the MVR process for CO 2 desorption. The overall performance of amine-based absorbents was also investigated by an absorption–desorption characters analysis. It shows triethylenetetramine (TETA) and N -methyldiethanolamine (MDEA) have great average CO 2 absorption rates and relatively high cyclic capacities per mole absorbent, and ethylenediamine (EDA) is considered to be the promising absorbent as cyclic capacity in mol CO 2 /kg absorbent. Diethanolamine (DEA) and 2-Amino-2-methyl-1-propanol (AMP) are found to have the best overall performances in terms of CO 2 absorption rate at lean loading and cyclic capacity in mol CO 2 /mol absorbent. In terms of overall performance, MDEA is mostly recommended for using in MVR process. Sweeping steam can significantly improve MVR performance in most selected absorbents except AMP and 2-amino-2-hydroxymethyl-1,3- propanediol (THAM) absorbents which present the potential to reduce the regeneration energy demand by operating without sweeping steam. The study also finds that MVR shows better regeneration performance as compared to traditional thermal regeneration process at the same regeneration temperature.
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International Journal of Greenhouse Gas Control
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2014
·
IF 3.821
Hui Hu,Fang Li,Qi Xia,Xiaodan Li,Li Liao,Maohong Fan
Ionic liquids (ILs) are varieties of green solvents that can capture CO 2 effectively. In this research, five synthesized amino ILs were evaluated for their CO 2 absorption performance. Experimental results showed that more amino groups in ILs led to higher CO 2 absorption capacities. For factors such as temperature, gas flow rate, and water content, water content had the most significant impact on the capacity to absorb CO 2 . A CO 2 absorption capacity of 0.96 mol-CO 2 /mol-IL was achieved with [TETAH] + [BF 4 ] − , with the IL containing 0% water and a gas flow rate of 100 ml/min at 293 K. However, when the water content of [TETAH] + [BF 4 ] − reached 40%, CO 2 absorption capacity increased to as high as 2.04 mol-CO 2 /mol-IL. Also, the CO 2 absorption capacity of [TETAH] + [BF 4 ] − increased rapidly with temperature in the range of 283–333 K, but decreased at temperatures greater than 333 K. According to the absorption–desorption recycling experiment of IL 3#, the regeneration rates of ILs increase with water content from 0% to 40%, while raising temperature does not improve regeneration rates. The FT-IR, 13 CNMR, pH and conductivity characterization results indicate that CO 2 reacted with NH 2 and NH in [TETAH] + [BF 4 ] − and formed carbamate. Simultaneously, CO 2 reacted with H 2 O and released H + , thus enhancing the absorption of CO 2 . This has important implications for various projects.
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International Journal of Greenhouse Gas Control
·
2014
·
IF 3.821
Zhicheng Xu,Shujuan Wang,Guojie Qi,Anastasia A. Trollebø,Hallvard F. Svendsen,Changhe Chen
The carbon dioxide (CO 2 ) solubility in aqueous 2-(diethylamino)-ethanol (DEEA) solutions were measured at (60 and 80 °C), with the DEEA concentrations of 3 M and 4 M and pressure range of (3 to 192 kPa). The absorption heat of CO 2 with (1, 3, and 4 M) aqueous DEEA solutions at different temperatures is also presented in this work. A thermodynamic model based on the electrolyte non-random two-liquid (eNRTL) theory within Aspen Plus ® has been developed to correlate and predict the vapor liquid equilibrium and heat of absorption of CO 2 in aqueous DEEA solutions. Meanwhile, the speciation of the solution at different loadings was also predicted using the developed eNRTL model.
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RSC Advances
·
2015
·Vol. 5
·期 93
·76346-76351
·
IF 3.84
Fangxin Zou,Li Peng,Wenxin Fu,Jianling Zhang,Zhibo Li
Porous aerogels are an inspiring absorbent for oil–water separation and water purification. In particular, hydrophobic silica aerogels from abundant and cheap sources offer both economical and environmental benefits. Conventional silica aerogels from alkoxy siloxane precursors involve time-consuming and laboursome multistep processes. Herein, we demonstrate the formation of flexible superhydrophobic polysiloxane aerogels through a facile hydrosilylation from functionalized polydimethylsiloxane in supercritical carbon dioxide. This robust aerogel exhibits a high oil absorption capacity, superior recyclability and extraordinary mechanical properties even under harsh heating and cooling cycles. These characters favor this polysiloxane aerogel as being more competitive than common alkoxy silica ones for oily water treatment, oil spill clean-up and oil recovery.
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