ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 25
·67758-67770
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IF 5.8
Wang Ke,Qin Xingzhen,Chai Kungang,Wei Zongwu,Deng Fan,Liao Bingyu,Wu Jinyu,Shen Fang,Zhang Zhi
Endocrine-disrupting compounds (EDCs) are increasingly polluting water, making it of practical value to develop novel desirable adsorbents for removing these pollutants from wastewater. Here, a simple cross-linking strategy combined with gentle chemical activation was demonstrated to prepare starch polyurethane-activated carbon (STPU-AC) for adsorbing BPA in water. The adsorbents were characterized by various techniques such as FTIR, XPS, Raman, BET, SEM, and zeta potential, and their adsorption properties were investigated comprehensively. Results show that STPU-AC possesses a large surface area (1862.55 m 2 ·g −1 ) and an abundance of functional groups, which exhibited superior adsorption capacity for BPA (543.4 mg·g −1 ) and favorable regenerative abilities. The adsorption of BPA by STPU-AC follows a pseudo-second-order kinetic model and a Freundlich isotherm model. The effect of aqueous solution chemistry (pH and ionic strength) and the presence of other contaminants (phenol, heavy metals, and dyes) on BPA adsorption was also analyzed. Moreover, theoretical studies further demonstrate that hydroxyl oxygen and pyrrole nitrogen are the primary adsorption sites. We found that the efficient recovery of BPA was associated with pore filling, hydrogen-bonding interaction, hydrophobic effects, and π-π stacking. These findings demonstrate the promising practical application of STPU-AC and provide a basis for the rational design of starch-derived porous carbon.
研究领域:
环境科学
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材料科学
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化学工程
·
水处理
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DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Tieying Wang,Tianying Zhang,Guizhi Xu,Chao Xu,Zhirong Liao,Feng Ye
The shape stable phase change materials (SSPCMs) consisting of coal fly ash (CFA) and potassium carbonate (K 2 CO 3 ) are promising candidates for high temperature thermal storage applications, owing to their low price, high melting enthalpy and low corrosivity of K 2 CO 3 . Nevertheless, the chemical reactions between K 2 CO 3 and CFA at high temperature limit its application. To solve this problem, in this work, a new two-step method for preparing SSPCMs containing K 2 CO 3 and CFA was proposed. Firstly, the CFA was successfully modified by K 2 CO 3 with a mass ratio of 3:2. The main phase of the modified CFA was changed into potassium aluminum silicate (KAlSiO 4 ). Then the SSPCMs were synthesized using the modified CFA and K 2 CO 3 . The latent heat and thermal conductivity of the prepared SSPCMS increased with the increase of salt content. The SSPCMs with potassium carbonate contents of 50 wt% (SSPCM-55) and 60 wt% (SSPCM-46) maintained good shape without cracks after the sintering processes . In addition, they showed a good cyclic stability in the 150 times thermal cycle tests in terms of mass, latent heat and chemical compatibility. The SSPCM-46 showed the best performance considering both heat transfer and energy storage density , and is promising to be used as a low-cost high-temperature PCM.
研究领域:
材料科学
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储能技术
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热工工程
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DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2016
·Vol. 128
·期 3
·1783-1792
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IF 1.781
Zhang Zhaoli,Yuan Yanping,Ouyang Liping,Sun Qinrong,Cao Xiaoling,Alelyani Sami
Nanofluids of Li 2 CO 3 –Na 2 CO 3 –K 2 CO 3 improved by three nano-Al 2 O 3 samples are firstly prepared by means of two-step aqueous method to enhance thermal properties for high-temperature heat transfer, when used as heat transfer fluids and thermal energy systems for concentrating solar power systems. Specific heat of ternary carbonates containing Al 2 O 3 of 0.2, 0.4, 0.8, 1.0, 1.4 and 2.0 mass% is measured, and nanofluids with 1.0 mass% of 20-nm Al 2 O 3 , 1.0 mass% of 50-nm Al 2 O 3 and 0.8 mass% of 80-nm Al 2 O 3 are selected as superior candidates. The maximum enhancement of specific heat is 18.5% in solid and 33.0% in liquid, 17.9% in solid and 22.7% in liquid, 13.2% in solid and 17.5% in liquid for nanofluids containing 20-, 50- and 80-nm Al 2 O 3 . Thermal conductivity is, respectively, improved by 23.3, 28.5 and 30.9% under the addition of Al 2 O 3 . New chemical bonds and crystals are scarcely formed in composites through FT-IR and XRD determination. SEM images certify that nano-Al 2 O 3 are homogeneously mixed into nanofluids and this structure may be a critical incentive for enhancing thermal properties. There are no significant changes with respect to the heat flow, melting/freezing point and latent heat after the 30 circles of determination. Briefly, it can be speculated that these nanofluids will exhibit tremendous potential in the coming applications of heat transfer and thermal storage for concentrating solar power systems.
研究领域:
材料科学
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能源工程
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化学工程
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Xu Jie,Chen Mengqi,Wei Yan,Hao Shuanghong
In this article, we propose a method of recovering p-MePhSO3K from the industrial by-product of quizalofop-p-ethyl. The phase diagram of the solid–liquid equilibrium system of p-MePhSO3K2CO3–H2O at the temperatures of 15, 25, 35, 45, and 55 °C was determined and plotted. Based on the phase diagram of 25 °C, the separation and recovery process of p-MePhSO3K from the p-MePhSO3K2CO3–H2O system was designed by analyzing the crystallization fields. First, p-MePhSO3K and K2CO3 were crystallized from wastewater in turn through evaporation separation. Then, the crystallized p-MePhSO3K was purified further by washing with ethanol. Finally, the pure p-MePhSO3K was transformed into the intermediate p-toluenesulfonyl chloride and then the intermediate l-p-toluenesulfonate ethyl lactate for quizalofop-p-ethyl production.
研究领域:
化学工程
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工业化学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2016
·Vol. 32
·期 4
·630-633
·
IF 1.086
Zhu Jian,Jin Zhimin
After being hydrolyzed into corresponding hydrosoluble carboxylate by 1,1,3,3,-tetramethylguanidine (TMG), camptothecin was extracted via the aqueous two-phase systems composed of ionic liquid 1,1,3,3-tetramethylguanidinium(TMGM) carboxylate and K 2 CO 3 , and was regenerated at the final by dilute aqueous hydrochloric acid. Among the ionic liquids, TMGM benzoate showed the best effect, TMGM formate the worst, this results were consistent with the liposolubilities of different carboxylic acid components in the ionic liquids. Through two-step extraction of TMGM benzoate ionic liquid/K 2 CO 3 aqueous two-phase at a favorable condition, camptothecin was obtained in a purity of 98.3% and a total yield of 85.1%, from the crude camptothecin extract with a purity of 14.2%.
研究领域:
药学
·
分离科学
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DOI
高影响因子
Catalysts
·
2018
·Vol. 8
·期 12
·633
·
IF 3.465
Jingxuan Long,Wenfeng Zhao,Yufei Xu,Hu Li,Song Yang
Catalytic reduction of 5-hydroxymethylfurfural (HMF), deemed as one of the key bio-based platform compounds, is a very promising pathway for the upgrading of biomass to biofuels and value-added chemicals. Conventional hydrogenation of HMF is mainly conducted over precious metal catalysts with high-pressure hydrogen. Here, a highly active, sustainable, and facile catalytic system composed of K2CO3, Ph2SiH2, and bio-based solvent 2-methyltetrahydrofuran (MTHF) was developed to be efficient for the reduction of HMF. At a low temperature of 25 °C, HMF could be completely converted to 2,5-bis(hydroxymethyl)furan (BHMF) in a good yield of 94% after 2 h. Moreover, a plausible reaction mechanism was speculated, where siloxane in situ formed via hydrosilylation was found to be the key species responsible for the high reactivity.Keywords:biomass conversion;biofuels;hydrogenation;green chemistry;sustainable catalysis
研究领域:
化学工程
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绿色化学
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可持续催化
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生物质转化
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DOI
高影响因子
Green Chemical Engineering
·
2026
·
IF 11.9
Jingjing Sun,Bo Chai,Haoren Chen,Suohe Yang,Guangxiang He,Shiyang Bai,Jihong Sun,Haibo Jin
Achieving the selective catalytic dimerization of the branched olefin via solid superbases remains a challenging yet sustainable strategy. In this study, a series of K/K 2 CO 3 solid superbase catalysts were rapidly prepared via the melt-loading method for the dimerization of isobutene (IBE) to 2,4,4-trimethyl-1-pentene (TP1). Carbonate vacancy concentration was readily tuned by regulating the pretreatment temperature of K 2 CO 3 . The screened 5%K/K 2 CO 3 -430°C catalyst, containing an appropriate amount of carbonate vacancies, achieved an isobutene conversion of 49.8% and a TP1 selectivity exceeding 80.9% under mild conditions (190 °C, 15 h), significantly outperforming conventional solid acid catalysts. Characterization results demonstrate that the carbonate vacancies (anion lattice defects) induced by optimal pretreatment temperature generate more coordinatively unsaturated oxygen (CUO) sites on the surface. These sites substantially strengthen the metal-support interaction (MSI, in a broad sense) between K and K 2 CO 3 , thereby enhancing the electron-donating ability of the superbasic sites. DFT calculations further reveal that the loaded metallic K promotes electron transfer to IBE through electron density redistribution and the semi-encapsulation configuration of K atoms in tri-oxygen hollow sites, enabling efficient activation of isobutene. In situ DRIFTS detects allylic anion intermediates, confirming that the reaction proceeds via a radical-anion pathway. This study provides a facile and effective approach for the efficient preparation of solid superbases and the construction of defect engineering in catalysts, offering new insights into the design of high-performance catalysts for green olefin conversion.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Xia Wang,Guiming Xie,Mengxue Chen,Xiang Ke,Chunliang Yang,Yongyong Shi,Yun Yi
The hierarchical porous carbon aerogels were prepared by dual molten salt method. • The symmetrical supercapacitor obtains 7.7 Wh·kg −1 at 60.0 W·kg −1 . • The symmetrical supercapacitor retains 96.23% capacity after 10,000 cycles. To boost the actual specific capacity and low rate performance of supercapacitors, it is necessary to effectively modulate storage sites of porous carbon materials, including microscopic defects and pore structures. In this study, a three-dimensional hierarchical porous carbon aerogel (KCA-0.5-0.5-800) was fabricated using sodium alginate as a biomass precursor via a synergistic activation strategy combining molten NaCl template and K 2 CO 3 chemical activation. The prepared material possesses an ultra-high specific surface area of 1908.4 m 2 ·g −1 and a large pore volume of 1.188 cm 3 ·g −1 , featuring a well-interconnected micro-meso-macroporous network and abundant structural defects. The KCA-0.5-0.5-800 electrode delivers a prominent specific capacitance of 286.4 F·g −1 at 0.5 A·g −1 in a three-electrode system, and maintains a capacitance retention of 72.11% at 5 A·g −1 . The assembled symmetric supercapacitor achieves a high energy density of 7.7 Wh·kg −1 at a power density of 60.0 W·kg −1 . Moreover, the device retains 96.23% of its initial capacitance along with a nearly 99.99% coulombic efficiency after 10 000 consecutive charge–discharge cycles at 5 A·g −1 . The prepared carbon aerogel showcases promising application prospects due to its unique structural features and outstanding electrochemical performance. Download: Download high-res image (175KB) Download: Download full-size image
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DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Yafei Guo,Chuanwen Zhao,Jian Sun,Weiling Li,Ping Lu
Silica aerogel supported K 2 CO 3 sorbents with different K 2 CO 3 loadings were synthesized by sol-gel and wet impregnation processes. The sorbents were characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) techniques. CO 2 capture performances of the sorbents were tested in a simulated ultra-dilute flue gas stream of 1.0%CO 2 and 2.0%H 2 O at 20 °C, using a fixed-bed reactor coupled with an online infrared gas analyzer. Sorbent regeneration performances of the samples were evaluated in a pure N 2 atmosphere at 200 °C with a heating rate of 10 °C/min. CO 2 capture capacity and K 2 CO 3 utilization efficiency increased first and then decreased with the increase in K 2 CO 3 loading. The desired sorbent with 20 wt% K 2 CO 3 was screened for investigating the effects of acid impurities. The presence of 500 ppm SO 2 and 500 ppm NO in the simulated flue gas stream was found to adversely affect the CO 2 capture, sorbent regeneration and multiple cyclic performances. Detailed mechanisms of the irreversible sorbent deactivation process were discussed. SO 2 could be chemically absorbed by K 2 CO 3 under a moist condition to form byproduct of K 2 SO 3 ·H 2 O, and the byproduct was stable and would be accumulated in the sorbent during the repeated cycles. This further attenuated the physical properties and K 2 CO 3 utilization efficiency of the sorbent. These results would lay a solid foundation for further application of the sorbent in ultra-dilute flue gas treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Imtiaz Afzal Khan,Jong-Oh Kim
In this study, the optimization of potassium carbonate (K 2 CO 3 ) exposure conditions for CO 2 capture with the use of 2-methypiperazine (2MPz) and monoethanolamine (MEA) as promoters was investigated. The tested operating conditions for the CO 2 capture process included the pH, temperature, K 2 CO 3 dose, gas flow rate, and pressure, and their effect on the CO 2 absorption/desorption rate and CO 2 absorption efficiency was assessed. Response surface methodology (RSM) was also employed to determine the equations for the optimal long-term operating conditions. The results showed that the CO 2 absorption rate and efficiency increased under K 2 CO 3 exposure with an increase in the pressure and loading rate. Moreover, for the temperature the absorption efficiency first increase and then decreases with increase in temperature, however, the with increase in temperature the faster absorption were observed with lower absorption loading rate. Furthermore, pH had a more complex effect due to its variable effects on the speciation of bicarbonate ions (HCO 3 − ) and carbonate ions (CO 3 2− ). Under higher pH conditions, there was an increase in the concentration of HCO 3 − , which has a higher CO 2 loading capacity than CO 3 2− . Contouring maps were also used to visualize the effect of different exposure conditions on the CO 2 absorption rate and efficiency and the role of 2MPz and MEA as promoters in the K 2 CO 3 solution for CO 2 absorption. The results showed that the mean CO 2 absorption rate was 6.76 × 10 −4 M/L/s with an R 2 of 0.9693 for the K 2 CO 3 solution containing 2MPz. The highest absorption rate (6.56–7.20 × 10 −4 M/L/s) was observed at a temperature of 298–313 K, a pressure of >2 bar, a pH of 8–9, and a loading rate of 80–120 L/h for a concentration of 1–3 M K 2 CO 3 and 0.05–1.5 M 2MPz. The CO 2 absorption efficiency exhibited a variation of 56–70% under the same conditions.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 6
·2768-2774
·
IF 5.503
Qinghai Yang,Congquan Zhou,Jihong Ni,Xiaofei Guan
We present a liquid catalytic system comprising a liquid Ni–Bi alloy and a molten K2CO3 salt, which completely resolves the coking and sintering issues for dry reforming. The conversions of CH4 and CO2 reach 60% and 70%, respectively, in a 30 cm bubble column comprising 15 cm Ni0.27Bi0.73 and 15 cm K2CO3 at 1050 °C. The CO selectivity is near 100% throughout the temperature range of 950–1050 °C. A 120 hour stability test at 1000 °C shows no performance degradation, suggesting a stable and effective dry reforming process for syngas production. The catalytic performance and durability demonstrated highlight the potential of dry reforming for commercial applications.
研究领域:
化学工程
·
催化
·
能源转换
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xin Liu,Yong-De Yan,Yun Xue,Yue-Lin Wang,Qing-Guo Zhang,Guan-Qing Hu,Fu-Qiu Ma,Jing-Ping Wang
Waste resins produced from nuclear facilities operation always contain organic sulfur and radioisotope 65 Zn, which pose a significant threat for the ecological environment. This study proposed comparative research for treating cation exchange resins doped with Zn 2+ (Zn-CERs) in Na 2 CO 3 -K 2 CO 3 and Na 2 CO 3 -K 2 CO 3 -KOH. The enhanced removal effect of sulfur and Zn 2+ by KOH addition was explored. The energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were carried out to investigate the element distribution and chemical states of C, O, S and Zn on Zn-CERs. The results of thermogravimetric analysis (TG) showed that the oxidation process of Zn-CERs was basically divided into three steps, and Zn 2+ acted as a catalyst for S-C destruction. The relatively mild reaction of Zn-CERs in Na 2 CO 3 -K 2 CO 3 -KOH largely avoids the escape of harmful gases (H 2 S and SO 2 ) caused by the overreaction. The participation of KOH could promote the sulfation of sulfides and sulfites, and the transformational SO 4 2− content reaches a maximum value (26.51 %) at 800 °C. When the temperatures above 700 °C, Zn 2+ and K + combines with SO 4 2− to form K 2 Zn 2 (SO 4 ) 3 . The proposed enhanced molten salt oxidation (MSO) system had excellent retention rates of Zn (99.56 %) and S (87.39 %) at 800 °C, which provides further technical references for the removal of organic sulfur and heavy metals.
研究领域:
环境科学
·
核化学与放射化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）