HYDROMETALLURGY
·
2023
·
IF 4.7
Xintong Li,Yongna Guo,Xin Ma,Chao Zhang,Jia Yang,Shuai Wang
Herein, a series of α -hydroxyalkyl phosphinic acids were designed and first introduced in Mn 2+ extraction and Mn 2+ -Mg 2+ separation. The extraction tests indicate that the α -hydroxy-2-ethylhexyl phosphinic acid ( α -H-2-EHA) possesses superior extraction ability compared to di-2-ethylhexyl phosphinic acid (P204) for Mn 2+ and Mg 2+ , and the partition coefficient ( β ) is 28.2 at a saponification ratio of 30%. The results of quantum chemical calculation, FT-IR spectrum and slope analysis method reveal that the α -H-2-EHA can form stable four-membered ring structure with metal ions during the extraction process through P–OH and P O bonds. Furthermore, the HOMO composition results suggest that α -OH might also promote the interaction between extractant and metal ions. Finally, a three-stage countercurrent extraction—washing—stripping process was proposed and Mn 2+ can be enriched from 11.2 g/L to 36.6 g/L, with Mg 2+ decreased from 30.3 g/L to 0.6 g/L, which provides an efficient strategy for the preparation of high-purity manganese.
研究领域:
化学工程
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分析化学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Youan Ji,Yucui Hou,Shuhang Ren,Weize Wu
Indole is an important chemical that can be directly obtained from wash oil mixtures. In this work, several tetraethyl ammonium amino acid (TAAA) ionic liquids (ILs) were designed to separate indole from model wash oil through forming hydrogen bonds. The effects of important factors, such as stirring time, TAAA type, indole concentration, temperature, and TAAA:indole mole ratio, on indole separation were investigated. It is found that these TAAAs can separate indole from model wash oil with separation efficacy up to 98.0% (for tetraethylammonium L-alanine ionic liquid), and the ultimate indole concentration is 1.6 g/dm 3 . This separation process takes less than 5 min. Also, for one kind of TAAA, the ultimate indole concentrations are almost constant despite different initial indole concentrations. The maximum distribution coefficients of indole are 200.9 at the studied conditions. We have also found that water content in TAAA shows a negative effect on indole separation, which inspired us to design a process for TAAA regeneration using water. After regeneration, TAAA can be reused, and the separation efficacy of indole is not significantly reduced. The FT-IR results show that there are hydrogen bonds between TAAAs and indole. Finally, we compared the TAAA method to other methods and demonstrated the advantages.
研究领域:
化学工程
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分析化学
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材料科学
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
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IF 2.781
Yun Yang,Tianjun Zhang,Dan Zhou,Xinchao Liu,Shuijin Yang,Xinhuan Lu,Qinghua Xia
Recently, a Ti-containing hollownest-structured zeolite (Ti-HSZ) material with the shell constructed by randomly intergrown MWW (framework type code) flaky crystals has been synthesized through one-step rotating hydrothermal method within 3.5 days, which shows predominant catalytic property for the epoxidation of alkenes . Herein, it is firstly reported that the crystallization efficiency of Ti-HSZ material can be notably increased by applying seeds-assisted synthesis method. Thus-crystallized materials have been characterized by XRD , UV–vis, XPS , SEM , TEM, FT-IR, and N 2 adsorption-desorption. Moreover, the key controlling factors are revealed to include the addition percentage of seed crystals, rotating rate and filling degree of autoclave. When 2 wt% or 3 wt% seed crystals are added into the reaction gel, the crystallization time of Ti-HSZ can be sharply reduced to 2.5 days or even 2.0 days, respectively. Particularly, thus-synthesized Ti-HSZ-SM material still maintains hollownest morphology characteristic and excellent catalytic activity and catalytic stability. About 95% allyl chloride can be converted into corresponding epoxide when using H 2 O 2 as oxidant, and about 85% cyclopentene and 87% cyclooctene can be converted into corresponding epoxides when using TBHP as oxidant, with the selectivity for epoxides of nearly 100%.
研究领域:
催化
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材料科学
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化学工程
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2020
·Vol. 46
·期 5
·2613-2639
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IF 2.262
Ahmad Kito,Hui Yang Zhao,Bairq Zain Ali Saleh
In this study, two different polymers have been synthesized and introduced as adsorbents to study their performances in the removal of Fe(III) ions and phenol from wastewater. The polymers have been synthesized by mixing acrylic acid, acryl amide, and N , N -dimethylacrylamide. This is both used as a primary polymer and grafted with graphene oxide as modified polymer to compare their performances in Fe(III) ions and phenol removal. The structure and morphology of the polymer and the grafting polymer with GO were characterized by FT-IR, SEM, and TEM. The effects of pH, time, contact temperature, and dosage of adsorbent were evaluated. From the obtained results, the optimum condition of the adsorption process was concluded to be a concentration of graphene oxide/polymer (1 g L −1 ) and polymer (3 g L −1 ) at an ion concentration of 75 ppm, pH 8 for 2 h. The highest removal rates for Fe 3+ and phenol were 92–98% and 86–89%, respectively. The Freundlich and Langmuir adsorption isotherm model was studied. The removal of Fe 3+ and phenol is consistent with a pseudo-second-order model, meaning physical adsorption occurs on the surface of both polymers. Other isotherm models, like Temkin and intra-particle, were used; the error function was calculated to test the fitness of all the models’ results. Adsorption was not consistent with the last two models and the result from the error function proved that the pseudo-second-order model is favorable for the removal of Fe(III) and phenol.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Jian Liu,Yingbi Chen,Yuting Hu,Yiting Zhang,Gengwei Zhang,Shixing Wang,Libo Zhang
A metal-organic framework (ZnO@ZIF-8) with great adsorption potential was developed using ZnO nanoparticles as a surface-active center and applied to lead removal from wastewater. The adsorption experiments were carried out and the related adsorption behaviors were investigated. The adsorbent shows excellent adsorption performance between pH 3–5. The maximum adsorption capacity of ZnO@ZIF-8 for Pb (II) was 689.36 mg/g at 303 K. The adsorptive process of Pb (II) onto ZnO@ZIF-8 conforms to the Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamics illustrate that the adsorption process is chemical adsorption on a uniform surface. Selectivity experiments showed that ZnO@ZIF-8 had the strongest affinity with Pb (II). The adsorption-desorption cycle confirmed that ZnO@ZIF-8 was a reliable and recyclable adsorbent. XPS, Zeta potential and FT-IR analysis illustrate that the adsorption of Pb (II) by ZnO@ZIF-8 was concentrated in electrostatic adsorption and chelation. DFT calculation indicated that there are different types of Pb (II) combination mode (Pb-N and Pb-O) and the adsorption mainly depended on the chelation. This study presented herein played important roles in the governance of heavy metal waste-water pollution as a result of ZnO@ZIF-8 can effective selectivity cleanup of Pb (II).
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2018
·
IF 0
Shanshan Jie,Congqiang Yang,Yuan Chen,Zhigang Liu
The highly dispersed active sites are desirable to optimize the atom efficiency. In this study, a series of novel cobalt grafted in N-doped carbon (Co-N-C) catalysts for selective oxidation of ethylbenzene are synthesized by heating a solution of cobalt porphyrin and peptides in ionic liquids, which are also characterized by techniques such as FT-IR, XRD, SEM-EDX, HR-TEM, and XPS. The results show that the as-prepared catalysts have an attractive catalytic performance, namely, 40% of ethylbenzene conversion and 75% of selectivity to acetophenone. Especially, the activity and selectivity of the as-prepared catalysts remain almost similar even after the 10th run. Moreover, the modified-complexometry method is verified to improve the dispersion of metal active sites. The remarkable catalytic performance of the as-prepared catalysts is attributed to the highly dispersed active sites and strong interactions between Co and N species in Co-N x moieties.
研究领域:
催化
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材料科学
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化学工程
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分析化学
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产品关联
DOI
AICHE JOURNAL
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2022
·Vol. 69
·期 5
·e17974
·
IF 4.167
Hao Yan,Delun Ren,Zhiqiang Li,Junshu Chen,Xinyang Zhang,Yanhao Wang,Gongzheng Duan,Xiang Feng,Xin Zhou,Yibin Liu,Xiaobo Chen,Chaohe Yang
Engineering acid site spatial location of zeolite catalyst harbors tremendous potential to boost catalytic performance but still remains a grand challenge for aromatization reaction. Herein, we successfully manipulate acid site spatial location inside the ZSM-5 channels to promote the hexane aromatization via the simple SiO 2 coating treatment. Multi-techniques demonstrated that the medium strong L acid in the channel originated from the Si(Al) O Zn structure is mainly retained in the Zn/ZSM-5-Si catalyst by covering the acid sites outside the channel. Surprisingly, there is a good linear relationship between BTEX yield and this medium strong L acid content. Based on the reaction kinetics, in situ FT-IR and theoretical calculations, it is found that the L acid with confinement effect served as the main active site could prominently enhance the cyclization of propene intermediate and the dehydrogenation of cycloalkane due to the strong affinity between the C/H and ZnOx, and control the desorption of BTEX (mainly benzene, toluene, ethylbenzene, and p-xylene) by weakening the binding of hydrogen proton to π electrons. Compared with the ordinary Zn/ZSM-5 catalyst, the yield of BTEX is increased by nearly 10%, and the Zn/ZSM-5-Si catalyst exhibits excellent anti coking deactivation ability. This strategy together with mechanistic results may pave the rational design of efficient Zn/ZSM-5 catalysts for aromatization reaction.
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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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Chengming Wu,Ting Wu,Jifan Li,Chun-Ling Liu,Wen-Sheng Dong
A series of zirconium phosphates (ZrP- x ) with various P/Zr ratios were prepared. Among the catalysts, ZrP-2.5 with a high specific surface area of 410.9 m 2 ·g −1 and abundant mesopores exhibited outstanding catalytic performance in the synthesis of p -xylene (PX) from 2,5-dimethylfuran (DMF) and ethylene. A high PX yield of 89.2% and a productivity of 72.3 mmol PX ·g cat −1 ·h −1 were achieved at 250 °C using a small amount of catalyst. The excellent catalytic performance of ZrP-2.5 was attributed to the synergy between the large quantities of acidic sites with appropriate acid strength distribution, balanced Brønsted and Lewis acidity, and abundant mesopores . In addition, the catalyst had excellent recyclability and stability. In-situ FT-IR spectra of adsorbed DMF and ethylene revealed the crucial roles of P-OH and the coordinately unsaturated Zr(IV) in the adsorption and reaction process, which is beneficial to understanding the reaction mechanism and designing highly efficient catalysts.
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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可持续化学
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产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.454
Lujiao Shi,Yi Wei,Nan Luo,Tianwei Tan,Hui Cao
In the present study, cationic xanthan gum (CXG) was synthesized to enhance the rheological property of xanthan gum (XG) by attaching quaternary amine groups to the backbone of XG. The efficacy of the substitution was confirmed by FT-IR spectra and 13C NMR. The surface morphology was changed considerably as demonstrated by SEM. The examined rheological properties of XG and CXG include steady-state and dynamic rheological properties. The results show that quaternary amine groups are successfully grafted onto the XG molecule. Apparent viscosity, storage modulus, and loss modulus of CXG solutions are greater than those of XG solutions under the same conditions. It is moreover found that apparent viscosity and viscoelasticity increase with the degree of substitution. The data indicate that the modified XG has much better heat resistance.
研究领域:
化学工程
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材料科学
·
流变学
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2016
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IF 4.055
Chenglong Wang,Lili Wang,Yi Huang,Xuying Nan,Qinguo Fan,Jianzhong Shao
A novel reactive organic pigment complex was prepared by 3-(Trimethoxysilyl) propyl methacrylate encapsulated on the surface of the organic pigment. The preparation conditions of the reactive organic pigment complex were optimized and the properties were characterized by FT-IR, DLS and UV–vis. The reactive organic pigment complex was used in blue-light curable pigment inks. The results showed that the photo-polymerization performance of the novel blue light curable pigment ink system was markedly increased in comparison with conventional pigment-based ink systems. The physical shielding effect of pigment particles on photo-polymerization performance can be reduced by increasing the photoinitiator concentration and irradiation intensities. The colorfastness to crocking of printed fabric was remarkably improved. However, the particle size of reactive organic pigment complex was slightly increased.
研究领域:
材料科学
·
化学
·
纺织工程
·
印刷技术
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Yanan Cao,Zhao Huang,Lingli Luo,Jiayin Li,Pao Li,Xia Liu
The magnetic molecular imprinting polymers nanoparticles (MMIPs NPs) for the extraction of norfloxacin (NOR) were prepared by self-polymerization of dopamine onto the surface of (3-Aminopropyl)triethoxysilane (APTES)-modified Fe 3 O 4 NPs. The MMIPs NPs were characterized by FT-IR spectroscopy, XRD, VSM and TEM. The characterization results show that the MMIPs NPs possess superparamagnetic characteristic with the saturated magnetization value of 38.6 emu/g, and the average particle size of about 14.3 nm. Furthermore, the adsorption performance of the MMIPs NPs was evaluated by the static, dynamic, selective adsorption and reusability experiments. The adsorption capacity of MMINs NPs for NOR is 14.2 mg/g with an imprinted factor of 2.1. About 82.4–102.4% of the added NOR (20, 40, 60 μg/mL) were recovered from fortified milk samples with MMIPs NPs as sorbent. Moreover, the MMIPs NPs can be reused for at least six times.
研究领域:
分析化学
·
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yuyang Wu,Xincheng Jiang,Jiangya Ma,Jingbo Wen,Shuang Liu,Hongxia Liu,Huaili Zheng
A kind of starch-based flocculant (starch- graft -poly[(2-methacryloyloxyethyl) trimethyl ammonium chloride], denoted St-g-PDMC-LPUV) has been synthesized by low-pressure ultraviolet initiation and was employed to remove humic acid (HA) for water purification . The physicochemical characteristics of starch and St-g-PDMC-LPUV were characterized by FT-IR, 1 H NMR, XRD, TGA , SEM and BET to confirmed the successful grafting DMC onto starch. Effects of flocculant dosage, pH, the adding amount of Fe 3 O 4 , initial HA concentration and stirring speed were investigated systematically. The prepared St-g-PDMC-LPUV flocculant with non-toxic, biodegradability and environmental friendliness exhibited effective performance for removing HA from water in a wide pH range (5–10). The flocculation mechanism was attributed to the effective collision between function groups of the St-g-PDMC-LPUV flocculant and HA by charge neutralization, adsorption, bridging and patching.
研究领域:
环境科学
·
化学工程
·
材料科学
·
水处理
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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）