CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Min Yuan,Tianchang Liu,Qi Shi,Jinxiang Dong
Efficient separation of furfural from an acid-containing aqueous solution is a critical step in the furfural production process. Zeolitic imidazolate framework (ZIF)-derived porous carbons with acid resistance and tunable surface chemistry/pore structure are promising adsorbents for the separation of organic compounds from acid-containing aqueous solutions. However, little attention has been given to establish the trend of distribution of micropores and mesopores in the chemical activation of ZIF-derived porous carbon, which directly affects the adsorption performance. Herein, we investigated the relationship between the distribution of micropores and mesopores and the N species content/type in the chemical activation of the N-doped ZIF-8-derived porous carbon, and the KOH activation mechanism was proposed. The intermediates K 2 CO 3 /K 2 O reacted with the C species of NC ZIF-8 1000C with a low N content, the CO was formed, and the structural deformation was not substantial, which is beneficial for the construction of abundant and larger micropores (10–20 Å), and a few mesopores (20–30 Å). While the reaction of the intermediate K 2 CO 3 /K 2 O with the higher-reactivity C–N species (pyridine and pyrrolic) of NC ZIF-8 800C with a high N content resulted in the formation of the intermediate product KOCN and decomposition product CO and NO, and the structural deformation was substantial, which led to the formation of abundant and larger mesopores (30–60 Å). Furthermore, the furfural (5.0 wt.%) static adsorption on the designed NC ZIF-8 1000C-700A with the abundant micropores is 1189.8 mg g −1 , and the selectivity of furfural/acetic acid mixture (5.0/2.0 wt.%) is 91.5, which exceeds that of traditional adsorbents.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF HETEROCYCLIC CHEMISTRY
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2014
·Vol. 52
·期 1
·284-295
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IF 0.873
F. Zhang,H. Chang,W. Wei
A facile and efficient KOH-oriented regioselective ring-opening reaction for the acetolysis of N -tosylaziridines in DMSO was developed under mild conditions. This operationally simple protocol could tolerate a variety of functionalized carboxylic acids as well as several N -tosylaziridines. Moreover, this strategy provided the corresponding ring-opening products with good results.
研究领域:
有机化学
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合成化学
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 6
·2557-2573
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IF 3.134
Liu Yueyu,Yin Zhili,Wang Ziqing,Mou Ronglin,Wei Zhong
High surface area ZrO 2 –KOH sample was prepared and used the catalyst for the synthesis of glycerol carbonate (GC) from dimethyl carbonate (DMC) and glycerol. The structure properties of ZrO 2 –KOH were characterized by XRD, BET, CO 2 -TPD, XPS, and ICP-OES. It was found that the strong basicity of ZrO 2 –KOH might be attributed to the oxygen vacancies as well as the big surface area. Experiments were developed to evaluate the effects of catalysis loading, proportion of reactants, temperature and reaction time on the conversion of glycerol to GC. The consequences showed that ZrO 2 –KOH was a highly efficient basic catalyst for synthesis of GC from glycerol. The catalytic performance of ZrO 2 –KOH is much better than that of ZrO 2 –KOH–CP, ZrO 2 –NH 4 OH, and some reported heterogeneous catalysts. And the higher performance of ZrO 2 –KOH was ascribed to the strong basicity. 99.43% conversion was obtained in a particular situation of catalyst/glycerol weight ratio of 3 wt%, DMC/glycerol molar ratio of 3:1, reaction temperature of 80 °C, and reaction time of 2 h. The plausible reaction mechanism for the transesterification on the strong basic active sites was discussed.
研究领域:
催化
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化学工程
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材料科学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2017
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IF 4.217
Ruilong Zhang,Zhiping Zhou,Atian Xie,Jiangdong Dai,Jiuyun Cui,Jihui Lang,Maobin Wei,Xiaohui Dai,Chunxiang Li,Yongsheng Yan
The wide applications of antibiotics in human and veterinary medicines have attracted ever-increasing attention due to their potential adverse effects for ecological environment, therefore, it is urgent and important to efficiently remove antibiotics from water. In this paper, we prepared hierarchical porous carbons from sodium carboxymethyl cellulose (CMCHPCs) via halloysite template and KOH-activation method for efficient removal of chloramphenicol. The physicochemical properties of CMCHPCs are analyzed by means of different characterizations. The adsorption properties of CMCHPCs are evaluated by equilibrium, kinetic, and thermodynamic adsorption experiments. In addition, the effects of ionic strength, solution pH, and humic acid on adsorption are studied. The results indicated CMCHPCs exhibit higher maximum monolayer adsorption capacity up to 769.95 mg/g and shows good regenerability and adaptability. Importantly, the adsorption mechanisms of chloramphenicol adsorbed onto the CMCHPCs are also discussed.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CARBON
·
2025
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IF 11.6
Yi Li,Qiancheng Liu,Peng Zhao,Qian Zhang,Zhongxiang Bai,Xiaoxiao Li,Yang Yang,Pan Wang,Kui Li,Ying Li,Xulin Yang
Hierarchical porous carbon (HPC) materials hold immense promise for advancing high-performance supercapacitors. However, the development of straightforward and sustainable synthetic routes remains a formidable challenge. This work employs a facile strategy combining low-temperature carbonization with the synergistic effects of chemical activation and salt templating, utilizing phthalonitrile monomer (RPH) as precursors to synthesize N-enriched hierarchical porous carbon. The optimized RKC-1 sample features an advantageous pore size distribution, a large specific surface area of 2079 m 2 g -1 , a N-doping loading of 1.86 %, and a moderate degree of graphitization. The RKC-1 electrode demonstrates a notable level of specific capacitance of 394 F g -1 at 1 A g -1 . Notably, in a two-electrode system at 5 A g -1 , after undergoing 10,000 cycles, the RKC-1 electrode maintains a capacitance retention rate of 80.34 % and achieves a Coulombic efficiency of 99.24 %. These results underscore that the synthesized RPH-based porous carbon demonstrates promising potential for practical applications in advanced energy storage systems.
研究领域:
储能
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材料科学
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化学工程
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电化学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2021
·Vol. 23
·期 3
·1-12
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IF 2.253
Mao Xisong,Xia Xuewen,Ning Deyang,Li Junqi,Chen Chaoyi,Lan Yuan-Pei
Molten salts synthesis (MSS) is a simple and potential technique for ceria nanoparticles (NPs) production, but the relevant effects of salt medium and cerium precursor on the synthesized ceria NPs need further attention. In the present work, we investigated the influences of frequently employed KCl–LiCl and KOH–NaOH molten flux and typical inorganic cerium precursors on the characterizations and photocatalytic property of ceria NPs. Results show that the CeO 2 NPs obtained in molten KOH–NaOH flux have smaller particle/crystal sizes but more serious agglomeration than that from KCl–LiCl flux. UV–Vis DRS spectra reveal that the ceria synthesized in molten hydroxides from the cerium nitrate precursor has the narrowest band gap of 2.87 eV in studied ceria samples. The ceria NPs obtained from KCl–LiCl flux have wider band gaps of 3.15–3.29 eV and faster recombination rates of photo-generated e − and h + . It was found that the ceria NPs obtained in molten KCl–LiCl salt show better photocatalytic activities for methylene blue (MB) degradation and may be due to the uniform size distribution and well-dispersed particles.
研究领域:
材料科学
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化学
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纳米技术
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DOI
高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 25
·12586-12593
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IF 11.301
Cuiqin Fang,Dong Zhang
Recently, structural supercapacitors have attracted considerable attention due to their concurrent capability to store electrochemical energy and support mechanical loads. However, the greatest challenge in realizing an integrated electro-mechanical system is the development of highly compatible electrodes and structural electrolytes with superior mechanical and electrochemical performance. Here, a structural supercapacitor assembled with a 3D rGO@MnO2 nickel foam electrode and polyacrylic acid–Portland cement–KOH electrolyte is reported to solve the challenge for the first time. The resulting rGO@MnO2 electrode exhibits a high areal capacitance of 1.84 F cm−2 at 0.5 mA cm−2, with the areal capacitance remaining at 1.13 F cm−2 even at a current density of 40 mA cm−2. The structural electrolyte with 6 wt% polyacrylic acid–Portland cement–KOH shows the best combination of an ionic conductivity of 2.13 mS cm−1 and a compressive strength of 28.5 MPa. The resulting asymmetric structural supercapacitor with an areal capacitance of 51.5 mF cm−2 at 0.1 mA cm−2 is superior to those reported in latest studies based on carbon materials and resin, which suggests its potential application in structural energy storage for civil engineering.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
Heliyon
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2024
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IF 3.4
Min Hu,Wenhao Wu,Chenkai Zhou,Hongxia Zhu,Laigang Hu,Ling Jiang,Daohui Lin,Kun Yang
Returning carbon materials from biomass to soil is a potential technology to retard organic contaminants or dissolved organic matter (DOM) in soil by adsorption, as well as to store carbon in soil for carbon sequestration. However, DOM was widely reported to inhibit adsorption of organic contaminants on carbon materials by competition and by enhancing contaminants' solubility. In this study, a KOH activated carbon material (KAC), pyrolyzed from bamboo chips, with high surface area (3108 m 2 /g), micropores volumes (0.964 cm 3 /g), mesopores volumes (1.284 cm 3 /g), was observed that it can adsorb fulvic acid (FA) and organic contaminants (e.g., nitrobenzene, phenols, and anilines) simultaneously with weak competition and high adsorption capacity. With 50 mg TOC/L FA, for example, the average competition suppressing rate (Δ K f / K f-m ) of organic contaminants on KAC was lower than 5%, the adsorption for organic contaminants and FA were higher than 1100 mg/g and 90 mg TOC/g, respectively. The weak competition on KAC could be attributed to the low micropore blockage (<35%) and the weak adsorption sites competition on mesopores of KAC, as well as the minimal solubility enhancement of organic contaminants by FA because most FA is adsorbed on KAC but is not dissolved in the solution. In addition, adsorption of organic contaminants with high hydrogen-bonding donor ability ( α m ) and adsorption affinity was less suppressed by FA because of the heterogeneous nature of hydrophilic sites on KAC's surface. Therefore, KAC could be a potential carbon material to be produced to implement to soil for carbon storage and simultaneous retarding organic contaminants and DOM.
研究领域:
环境科学
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土壤科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2021
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IF 6.291
Jing Xiang,Ying Mi,Benxiang Luo,Shuangjiao Gong,Yingru Zhou,Taowu Ma
Modified composite biochar offers a cost-effective solution for the remediation of contaminated sediments; however, few studies have evaluated the effects of modified composite biochar amendment on the ecotoxicity of contaminated sediment based on benthic macroinvertebrates. A 21-day sediment toxicity test was conducted using the freshwater snail Bellamya aeruginosa to examine the intrinsic ecotoxicity of a novel KOH-modified composite biochar (KOH-CBC) and its efficacy for reducing the bioavailability, uptake, and ecotoxicity of perfluorooctanoic acid (PFOA). It was found that KOH-CBC is toxic to B. aeruginosa , which may be attributed to its high polycyclic aromatic hydrocarbons (PAHs) content and alkalinity. The addition of KOH-CBC to PFOA-contaminated sediments can markedly reduce the bioavailability and uptake of PFOA by more than 90% and 50%, respectively, and subsequently alleviate the toxicity of PFOA to B. aeruginosa by at least 30%. Increasing the KOH-CBC dosage is not beneficial for further mitigating the toxicity of PFOA-contaminated sediments. Our findings imply that KOH-CBC is a promising sorbent for the in-situ remediation of PFOA-contaminated sediments. Application of acidified KOH-CBC at a dosage of approximately 1–3% will be sufficient to control the ecotoxicity of PFOA; however, its long-term environmental effects should be further validated.
研究领域:
环境科学
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生态毒理学
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污染控制
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DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
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2025
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IF 4.1
Sun Zhonghe,Yang Qianhui,Zhu Mingxin,Pan Shunlong,Zhou Hua
In the penicillin fermentation production industry, a large amount of waste bacterial residue is generated annually, posing significant potential risks to the environment. Currently, the most common method of disposal, incineration, wastes a considerable amount of biomass resources. This study utilizes penicillin fermentation bacterial residue as the raw material to prepare two types of high-performance magnetic biochar activated by KOH/K 2 FeO 4 (K 2 FeO 4 -BC, KOH/K 2 FeO 4 -BC) for the adsorption of ofloxacin. The results indicate that the addition of KOH effectively improves the biochar’s adsorption performance for ofloxacin. The BET specific surface areas of the two materials are 777.88 m 2 ·g −1 and 846.16 m 2 ·g −1 , respectively. The average mesopore diameter of KOH/K 2 FeO 4 -BC is 5.34 nm, and the mesopore volume accounts for over 99.5% of the total pore volume. At 298K, the saturated adsorption capacity of KOH/K 2 FeO 4 -BC for ofloxacin is 289.86 mg·g −1 . The experiment demonstrates that the adsorption behavior of ofloxacin on KOH/K 2 FeO 4 -BC is more consistent with the Freundlich model and the second-order kinetic model. KOH/K 2 FeO 4 -BC achieves rapid removal of ofloxacin, with the adsorption removal effect reaching over 95% of adsorption saturation within 30 min. Repeated use experiments show that after five cycles, KOH/K 2 FeO 4 -BC retains 56.71% of its initial adsorption performance. Graphical abstract
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2021
·
IF 7.145
Huayi Chen,Xingjian Yang,Yonglin Liu,Xueming Lin,Jinjin Wang,Zhen Zhang,Na Li,Yongtao Li,Yulong Zhang
Waste chicken feathers are the ideal precursor for the production of low-cost N-enriched biochar. KOH-modified N-enriched biochar (KNB) containing 15.92 wt% N was successfully prepared using waste chicken feathers. The adsorption kinetics results showed that KNB had rapid Cd (2 h) and Pb (1 h) adsorption rates. The Cd and Pb adsorption capacities of KNB (the values of K F were 22.324 (Cd) and 119.654 (Pb) mg 1−(1/n) ·L 1/n ·g −1 ) were 7.07 and 26.52 times higher than those of the original biochar based on the adsorption isotherm results. The KNB was stable at pH 3–6 and had stronger co-adsorption capacities in double-ion systems. Based on the adsorption experiments and various characterization methods, we concluded that the primary Cd and Pb adsorption mechanisms of KNB involved electrostatic interactions, cation-π interactions, complexation, and K + exchange. The precipitation mechanism could partially account for Pb adsorption but not for Cd adsorption. KOH modification enhanced the electronegativity of biochar and then increased the electrostatic attraction. Surface O- and N-containing functional groups were involved in Cd and Pb adsorption. Graphitic-N, oxidised-N, and O C O were the main active adsorption groups, the relative contents of which increased after KOH modification, thus increasing the Cd and Pb adsorption performance. Therefore, KNB can be used as a fast and highly efficient adsorption agent to remove Cd and Pb from wastewater containing either Cd and Pb or a combination of these two metals.
研究领域:
环境科学
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材料科学
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废水处理
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 7
·2825-2839
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IF 9.8
Chao Li,Yuannian Li,Yuewen Shao,Lijun Zhang,Shu Zhang,Shuang Wang,Bin Li,Zhenhua Cui,Yonggui Tang,Xun Hu
In the chemical activation of biomass, it is a common practice to directly mix an activating agent, such as KOH, and feedstock for production of activated carbon (AC). Nevertheless, this generates AC with a high ash content and the solid–solid contact may not be sufficient. Herein, the activation of biomass (cellulose, lignin, and sawdust) with volatilized KOH at 900 °C was proposed by placing feedstock and KOH in two beds with up-down configurations. The volatilized KOH was expected to penetrate and activate the biomass in the upper bed. The results confirmed the hypothesis and a higher yield of AC was obtained from the activation with volatilized KOH than the direct activation of the mixture. The activation with volatilized KOH resulted in lignin-derived AC with a specific surface area of 652.8 m2 g−1, which was significantly higher than that from heating without an activator (262.2 m2 g−1). The activation with volatilized KOH was also effective for creating micropores in the sawdust- and cellulose-derived AC. Notably, the activation reduced residual KOH by >90% in the cellulose-derived AC, which made recycling of the unused KOH possible and remarkably reduced the cost for post-pretreatment of the AC for removing the inorganics. Besides, the activation with volatilized KOH enhanced the carbonization and thermal stability of the AC. In addition, the intensive cracking reactions in the direct activation destroyed the fibrous biological structure of the biomass in the AC, which, however, could be retained in the activation with volatilized KOH. Furthermore, the activation with volatilized KOH also showed a lower environmental impact and higher material efficiency than the direct activation.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）