RSC Advances
·
2020
·Vol. 10
·期 35
·20504-20514
·
IF 3.119
Jianwen Wei,Siqi Chen,Yu Li,Zeyu He,Linlin Geng,Lei Liao
To find an alternative adsorbent with high adsorption performance, KIT-6 was prepared by hydrothermal crystallization synthesis using tetraethyl orthosilicate as a silicon source and triblock copolymer P123 as a template. Then the silane coupling agent (3-chloropropyl)trimethoxysilane was first grafted onto KIT-6 mesoporous material and then the polyethyleneimine (PEI) was further grafted through the substitution reaction between amino groups and chlorine atoms. The functionalized KIT-6 was denoted as PEI/KIT-6. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption, elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). The Cu2+ adsorption performance was determined by inductively coupled plasma (ICP). The results showed that the average loading of the amino groups was 3.74 mmol g−1, and the modified KIT-6 still has a stable mesoporous structure without pore blockage. With the dosage of 1 g L−1 PEI/KIT-6 and at room temperature, the optimum pH value for adsorption of 100 mg L−1 Cu2+ was 6.0. The adsorption capacity of PEI/KIT-6 for Cu2+ increased with the increase of reaction temperature, and the maximum adsorption capacity of Cu2+ was 36.43 mg g−1. The adsorption capacity tends to reach equilibrium after 120 min, and the optimum adsorption temperature was 35 °C. The pseudo-second-order kinetic model was found to be well suited for the adsorption process of Cu2+. Adsorption equilibrium data could also be described well by the classical Langmuir and Freundlich isotherm models. The adsorption tends to be the chemisorption of a monolayer.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Sobia Aslam,Fazle Subhan,Zifeng Yan,Peng Peng,Ke Qiao,Wei Xing,Peng Bai,Rooh Ullah,U.J. Etim,Jingbin Zeng,Muhammad Ikram
In the present contribution, a single step H 2 -reduction strategy was developed for the first time to fabricate nickel-based KIT-6 (Ni-KIT-6) for adsorptive desulfurization of fuels . As-synthesized KIT-6 was used as a support and nickel nitrate, nickel chloride and nickel acetate as a nickel precursor was directly introduced into as-synthesized KIT-6. Ni 0 -based KIT-6 was obtained by single-step H 2 -reduction strategy which not only remove template and decompose nickel precursors to NiO but also reduce NiO to Ni 0 . This strategy is much more convenient and facile than reported strategies for Ni-based mesoporous silica KIT-6. Characterization results show that Ni-KIT-6 with nickel content up to 30 wt.% was highly dispersed due to silanols and confined space in as-synthesized KIT-6. The percentage content (54%) of Ni 0 in the as-synthesized KIT-6 is higher than Ni-based calcined KIT-6 (38%). Interestingly, Ni-based as-synthesized KIT-6 prepared using nickel nitrate as a precursor exhibited stronger nickel-KIT-6 interaction, higher Ni 0 content and dispersion than those prepared with nickel chloride and nickel acetate precursors. We also demonstrate here that the shielding effect of capping anions and hydration degree of different nickel precursors significantly affect the dispersion of nickel species even using as-prepared KIT-6 as a support. As a result, Ni-KIT-6(NO 3 − ) captured 0.195 and 0.12 mmol g −1 of sulfur from model fuel and FCC gasoline, respectively. Thus, single step H 2 -reduction strategy may have potential applications to be applied for fabrication of other nickel based mesoporous silicas for adsorptive desulfurization technology .
研究领域:
材料科学
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能源化学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2018
·
IF 1.712
Chongwen Jiang,Jundong Zhu,Bing Wang,Lu Li,Hong Zhong
Zirconium doped mesoporous KIT-6 samples with different Si/Zr ratios were synthesized by the direct hydrothermal method. Various characterization techniques confirm that highly distributed ZrO 2 nanoparticles and multi-coordinated Zr 4+ species are incorporated in the mesoporous composites. One-pot synthesis of 5-hydroxymethylfurfura(HMF) from glucose was examined in the presence of Zr-KIT-6(20) the molar ratio of Si to Zr is 20 under aqueous system. The effects of temperature, reaction time, catalyst dosage and biphasic solvent system on the conversion of glucose and the HMF yield were investigated. It was found that the glucose conversion and the HMF yield have been improved from 54.8% to 79.0% and from 19.5% to 34.5% in the biphasic MIBK-water system, respectively. Both the acidity of Zr-KIT-6(20) and the biphasic MIBK-water system are responsible for the improved performance of glucose dehydration to HMF.
研究领域:
化学工程
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材料科学
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催化反应
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 12
·7503-7513
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IF 3.9
Mengmeng Zhu,Yunpeng Liu,Haojie Ding,Shulan Zhang,Mujing Qu,Tongtong Xuan,Huili Li
All-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have great application prospects in many fields due to their excellent photoelectric properties. However, CsPbX 3 NCs are extremely sensitive to water, heat, light, and oxygen, which leads to dramatic photoluminescence quenching and seriously restricts their future commercial applications. Herein, a novel, simple one-step solution strategy for synthesizing high-quality CsPbBr 3 NCs was reported. By the combination of the hot-injection process with the mesoporous template confinement effect of the KIT-6 matrix, the space-confined growth of NCs was precisely achieved. The CsPbBr 3 NCs encapsulated by KIT-6 (CsPbBr 3 @KIT-6 composite) exhibited a uniform size, a high photoluminescence quantum yield (PLQY) of up to 82%, and a narrow full width at half-maximum (FWHM) of 24 nm. Most importantly, CsPbBr 3 @KIT-6 powder composites had dramatically enhanced light, thermal and water stability in comparison with colloidal CsPbBr 3 NCs due to the dual protection of organic ligands and matrix templates. Ultimately, a white light-emitting diode (LED) device was successfully fabricated by encapsulating a mixture of green-emitting CsPbBr 3 @KIT-6 composite and red-emitting K 2 SiF 6 :Mn 4+ phosphor onto a blue-emitting InGaN LED chip. A color coordinate of (0.327, 0.337) and a wide color gamut of 128% NTSC well demonstrate their potential applications in lighting and display.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Shuting Zhang,Jianwen Wei,Linlin Geng,Lin Ge,Lei Liao
Novel bifunctionalized amine-based protic ionic liquid/KIT-6 composite adsorbents for carbon dioxide (CO 2 ) adsorption have been prepared by impregnating amine-based protic ionic liquids of different types (tetraethylenepentamine nitrate, [TEPA][NO 3 ], or tetraethylenepentamine lysinate, [TEPA][Lys]) and concentrations (20, 30, 40, and 50 wt%) onto N-[3-(trimethoxysilyl)propyl]ethylenediamine-grafted KIT-6. These innovative hybrid adsorbents exhibited remarkable CO 2 adsorption performance and thermal stability. In particular, the adsorbent with 40 wt% [TEPA][Lys] loading exhibited the highest adsorption capacity at 90 ℃ (3.670 mmol·g −1 ), which was almost 5 times higher than that of the original carrier KIT-6 (0.850 mmol·g −1 ). This excellent adsorption performance can be ascribed to the synergistic effect of strong affinity between the amine groups and CO 2 and high porosity of the support. After five adsorption/desorption cycles, the CO 2 adsorption by the adsorbents demonstrated significant regeneration, and the saturated adsorption capacities of 2N-K6-P30 and 2N-K6-L40 were only 8.98 % and 7.77 % lower than those of the original ones, respectively. In addition, the infrared results revealed that CO 2 adsorption is a synergistic process of physical and chemical adsorption, in which chemisorption is dominated, and the CO 2 adsorption mechanism is consistent with the zwitterion mechanism. In conclusion, the bifunctionalized amine-based protic ionic liquid/KIT-6 adsorbents can be suggested as potential/recyclable materials for efficient removal of CO 2 from industrial flue gases after desulfurization.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials Today Communications
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2022
·
IF 3.662
Yanfei Jia,Jianwen Wei,Yuan Yuan,Xiaobin zhou,Linlin Geng,Lei Liao
Using KIT-6 as the silica source, a series of Li 4 SiO 4 adsorbents (KIT-6-Li 4 SiO 4 ) were synthesized by impregnation precipitation method for high temperature CO 2 capture. Then, the KIT-6-Li 4 SiO 4 -800–4 (KL-800–4) material, was selected to analyze the improvement of the adsorption performance by Ca 2+ /Na + eutectic doping modification. These adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and low temperature N 2 adsorption/desorption, and the CO 2 adsorption capacity of them was explored. At 600 °C and under 15 vol% CO 2 , KL-Ca0.03 and KL-Na0.06 sorbents resulted in a CO 2 uptake of 29.17 wt% and 35.35 wt% (close to the theoretical maximum), respectively，which are much higher than that of KL-800–4 (14.73 wt%). After 10 adsorption/desorption cycles, the adsorption capacity of KL-Na0.06 increased by 1.35 wt%. We found that KL-Na0.06 has more advantages compared with traditional lithium orthosilicate and undoped adsorbents, including lower energy consumption, higher CO 2 adsorption capacity and better cycling ability. Finally, the double exponential model had a high degree of fit for the adsorption of CO 2 by Li 4 SiO 4 .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zain Bairq,Ya Pang,Jia Li,Abdo Hezam,Paitoon Tontiwachwuthikul,Han Chen
The primary challenge hindering the widespread industrial adoption of amine-based CO 2 capture technology is the sluggish desorption rate of carbon dioxide (CO 2 ) and the substantial energy required in the regeneration phase. Despite considerable advancements aimed at reducing energy demands through novel amine solvents and process optimization, there remains a critical need for innovative solutions. This study introduces mesoporous silica nanoparticles KIT-6, along with super solid acid catalysts SO 4 2− /SnO 2 and SO 4 2− /ZrO 2 , to assess their impact on enhancing the desorption rate and reducing the energy consumption in the CO 2 capture process from rich monoethanolamine (MEA) at 96 °C. Our findings indicate that all the tested catalysts significantly expedite the regeneration process, reducing the energy required for regeneration up to 33.50 % and boosting the desorption rate by 150.25 % beyond what is achieved with MEA alone. KIT-6, in particular, displayed superior catalytic activity and energy efficiency in the desorption process. The catalysts SO 4 2− /ZrO 2 , SO 4 2− /SnO 2 , and KIT-6 improved the desorption rate by 20 %, 37.5 %, and 150.25 %, respectively, and cut down the energy required for regeneration by 11.10 %, 24.44 %, and 33.50 % respectively when compared to conventional aqueous MEA under the same conditions. Moreover, KIT-6 was subjected to ten cycles of CO 2 desorption testing to verify the cyclic robustness. A potential mechanism explaining the enhanced CO 2 capture facilitated by KIT-6 is also proposed within this work.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Min Liao,Sheng Long,Pan Zou,Ke-Yi Zhang,Hai-Cheng Liang,Kai Jiang,Du Xie,Fan-Ming Yang
Porous materials of PEI(n)/Zr(N)-KIT-6 were prepared by doping zirconium to the KIT-6 framework and introducing poly(ethylenimine) (PEI) to the pore channels (n is the weight percentage of PEI to Zr(N)-KIT-6, and N is the molar ratio of Zr/Si). The adsorbents were characterized and tested at a 20% CO2 concentration to investigate the influence of Zr and PEI on CO2 adsorption. The results display that Zr–O–Si bonds are formed after the doping of Zr species. In addition, PEI is loaded on the surface through the formation of hydrogen bonds and Zr–N bonds. The synthesized PEI(n)/Zr(N)-KIT-6 materials keep stable when the temperature is lower than 210 °C. In addition, the materials exhibit good CO2 adsorption performance, which is attributed to the existence of Zr and PEI. The Lewis acidity of KIT-6 is improved after the doping of Zr heteroatoms, leading to the immobilization of more PEI and the enhancement of CO2 adsorption properties. The adsorption includes two steps: diffusion of CO2 in the pore channels and the reaction between CO2 and amine groups. When the gas flow rate is 40 mL/min, the maximum CO2 adsorption capacity of 174.7 mg/g is achieved. After 20 cycles, the adsorption value keeps stable.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
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2020
·Vol. 10
·期 56
·34187-34196
·
IF 3.119
Yuan Yuan,Jianwen Wei,Linlin Geng,Dejun Mei,Lei Liao
An amine-bifunctionalized composite strategy was used to fabricate grafted-impregnated micro-/mesoporous composites for carbon dioxide capture. The micro-/mesoporous Beta/KIT-6 (BK) composite containing a high-silica zeolite with a three-dimensional twelve-membered ring crossing channel system and cubic structural silica was used as a support, and 3-aminopropyltrimethoxysilane (APTS) and tetraethylenepentamine (TEPA) were used as the grafted and impregnated components, respectively. The amine efficiency, adsorption kinetics, thermal stability, regeneration performance, and the effects of impregnated amine loadings (30–60%) and temperatures (40–90 °C) on the CO2 adsorption performance were investigated using a thermal gravimetric analyzer (TGA) in the mixed gases (15 vol% CO2 and 85 vol% N2). At 60 °C, the bifunctionalized Beta/KIT-6 (1 mL APTS g−1 BK) displayed the highest CO2 adsorption capacity of 5.12 mmol g−1 at a TEPA loading of 50%. The kinetic model fitting results showed that the CO2 adsorption process was a combination of physical and chemical adsorption, wherein the chemical adsorption is dominant. After five adsorption/desorption cycle regenerations, the saturated adsorption capacity of the composite material was 4.86 mmol g−1, which was only 5.1% lower than the original adsorption capacity. The composites demonstrated excellent CO2 adsorption performance, indicating the promising future of these adsorbents for CO2 capture from actual flue gas after desulfurization.
研究领域:
化学工程
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环境科学
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DOI
PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Jinglei Cui,Dan Ren,Jingjing Tan,Huirong Zhang,Yanxia Guo,Long Huang
Toluene is one of the typical volatile organic compounds in industry, particularly in energy and fuels production processes, which is required to be eliminated effectively to protect the environment. Catalytic oxidation of toluene is widely studied for its high efficiency, and rational design and synthesis of metal catalysts are keys for toluene oxidation. In this study, an efficient catalyst was designed and synthesized by introducing −NH2 groups on the ordered mesoporous silica (KIT-6) surface to anchor and disperse Pd species, leading to Pd nanoparticles being highly dispersed with uniform particle size distribution. Meanwhile, it was found that the introduction of −NH2 made Pd centers present an electron-rich state, and the active Pd centers could activate O2 molecules to generate more reactive oxygen species and promote the conversion of toluene, which was verified by in situ XPS and O2-TPD characterization. Compared with the catalysts prepared by an impregnation method, the catalytic performance of the Pd/NH2-KIT-6 (0.5 wt %) catalyst was significantly improved. A conversion of 90% for toluene (2400 ppm, 24,000 mL·g–1·h–1) was achieved at 171 °C, and the toluene conversion was maintained above 90% for 900 min, displaying the excellent activity and stability of the Pd/NH2-KIT-6 catalyst.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 10
·7971-7978
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IF 3.086
Huan Liu,Kai Tao,Peipei Zhang,Wei Xu,Shenghu Zhou
Ordered tungsten and aluminum co-doped mesoporous KIT-6 catalysts (W-Al-KIT-6) with different Si/Al molar ratios were successfully synthesized by a one-pot synthesis method. The obtained W-Al-KIT-6 catalysts were tested for catalytic conversion of 1-butene and ethene to propene via isomerization of 1-butene to 2-butene and subsequent cross metathesis of 2-butene and ethene. Various characterization techniques, such as ICP-OES, XRD, BET, TEM, Raman, XPS and NH3-TPD, were used to characterize the catalysts. The introduction of Al did not change the mesoporous structure of KIT-6 when the nominal Si/Al was 10, 20 or 30. Moreover, the sample demonstrated a larger amount of acidic sites. The W-Al-KIT-6 catalysts with suitable Si/Al ratios illustrated a superior catalytic performance to W-KIT-6 catalyst. The origin of catalytic performance enhancement over W-Al-KIT-6 catalysts is preliminarily discussed and ascribed to the highly disperse W species and a large amount of acidic sites. The acidic sites were formed by the introduction of a suitable amount of Al in the W-KIT-6 framework, which accelerated the isomerization of 1-butene to 2-butene and promoted the cross metathesis of 2-butene and ethene to propene.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 9
·6932-6938
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IF 3.289
Yueyun Li,Yihe Zhang,Liping Jiang,Paul K. Chu,Ynhui Dong,Ping Wang
An ultrasensitive electrochemical immunosensor is designed and constructed for the quantitative detection of squamous cell carcinoma antigens (SCCAs). Silver nanoparticles (AgNPs) hybridized and 3-aminopropyltriethoxysilane functionalized graphene sheets (Ag@APTES-GS) serve as the platform to immobilize primary antibodies (Ab1). The mesoporous AgNPs-decorated silica KIT-6 (Ag@KIT-6) with a large specific surface area is utilized to label the electron mediator thionin (TH) and secondary antibodies (Ab2) by physical adsorption and chemical bonding. Carboxymethyl chitosan (CMC) doped with ionic liquids (ILs) is used to facilitate electron transfer and prevent leaking of TH resulting in multiple signal amplification. In addition to the excellent detection limit (17 fg mL−1, S/N = 3) and wide linear range (5 × 10−5 ng mL−1 to 102 ng mL−1), the immunosensor shows good selectivity, reproducibility, and stability. Providing quantitative detection of SCCA in serum, the sensor has great potential in clinical and diagnostic applications.
研究领域:
生物医学工程
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诊断学
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纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）