JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
·
IF 2.8
Boyun Gao,Huijiang Huang,Mooeez Ur Rehman,Bin Ren,Yuruo Liu,Weipeng Fan,Pengfei Li,Lizhi Zhang,Yan Xu,Yujun Zhao
BACKGROUND The synthesis of fatty amines via fatty alcohol amination offers a promising avenue for environmentally friendly production, particularly when compared with the methods employing hydrocyanic acid which often involve significant emissions. RESULT This study explores the synthesis of n-hexylamine through one-step amination of n-hexanol utilizing a series of Ru-doped Ni catalysts supported over γ-Al 2 O 3 , achieving 61% n-hexanol yield, 35% dihylamine yield and 3.5% trihylamine yield at the n-hexanol conversion of 99%. CONCLUSION The characterization results of the catalysts revealed a significant interaction between ruthenium and nickel in the bimetallic catalysts, leading to the enhanced reducibility of Ni species and improved metal dispersion. Moreover, ruthenium species were found to play an important role in the dissociation of NH 3 into NH x (x = 1, 2), thereby significantly improving the dehydrogenation process of n-hexanol at Ni sites. The synergistic effect between the two kinds of metal sites emerges as crucial factor for the boosted alcohols amination process. © 2024 Society of Chemical Industry (SCI).
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Xiaohui Fu,Zheng Li,Min Lin,Jing Sun,Zhibo Li
A series of N -alkylated glycine and l -alanine bearing oligoethylene glycol (OEG) and benzyl side chains, i.e., N -(4-oligoethylene glycol)benzyl glycine and N -(4-oligoethylene glycol)benzyl alanine (NMe(OEt) x OBnG and NMe(OEt) x OBnA, x = 1–3), have been readily synthesized via schiff base and reductive amination reactions. The successful ring opening polymerization (ROP) of N -substituted glycine N -carboxyanhydrides (NCA) results in three types of peptoid oligomers (PNMe(OEt) x OBnG, x = 1–3). Depending on the length of OEG side chains, PNMe(OEt) x OBnG show different solubility in water. Particularly, the as-prepared oligomers containing three ethylene glycol units (PNMe(OEt) 3 OBnG) display interesting thermoresponsive aggregation behaviors in water. DSC results reveal that all the oligomers show crystalline behaviors with melting temperatures decreasing as the OEG side chain length is increased. Both live-dead and MTT assays indicate low cytotoxicity of PNMe(OEt) 2 OBnG and PNMe(OEt) 3 OBnG toward HeLa cells, comparable to benchmark PEG. Concerning thermoresponsive and crystalline properties, the as-prepared peptoid oligomers are potentially promising building blocks for stimuli-responsive bioinspired materials and hierarchical self-assembly.
研究领域:
生物材料学
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高分子化学
·
细胞生物学
✓ 已验证
DOI
高影响因子
Membranes
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2019
·Vol. 9
·期 2
·20
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IF 0
Yan Liu,George Q. Chen,Xiuli Yang,Huining Deng
In recent decades, the advancements in layer-by-layer (LBL) assembly technology have provoked increasing interest in the preparation of multilayer polyelectrolyte membranes with excellent performance. In the current study, a novel nanofiltration (NF) membrane was prepared by pressure-driven layer-by-layer (LBL) assembly of polyethylenimine (PEI) and polyacrylicacid (PAA) on a porous substrate with chemical crosslinking. The effect of deposition pressure on separation performance of the prepared membranes was studied. The surface morphology, hydrophilicity and the charge property of the dynamically-deposited membranes were compared with those prepared by static adsorption. The characterization results showed that dynamic deposition process resulted in a smoother membrane surface with improved hydrophilicity. The mechanism of water-path formation was proposed to interpret the effect of pressure on the membrane performance. Glutaraldehyde (GA) was used as a crosslinker to reduce the number of polyelectrolyte bilayers for obtaining good separation performance. The rejections of different inorganic salts of the dynamically-deposited NF membrane were also investigated.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
Desalination and Water Treatment
·
2024
·
IF 1
Jia Zhu,Wei Wei,Chaosheng Zhang,Hongwei Rong,Yongfeng Cao
ABSTRACT Although synthetic polymeric organic compounds have been widely used in sludge-recycling enhanced flocculation (SEF) process as the coagulant aid, effects of their molecular weight (MW) on strengthening ability and floc characteristics variation of SEF, that is, floc recovery ability, floc morphology structure and distribution, remained unclear. In this study, those effects under two colloidal destabilization mechanisms, namely electrostatic patch (EP) and near charge neutrality (NCN), in kaolin colloidal system and humic acid–kaolin colloidal system were investigated using response of SEF and traditional flocculation (TF) to polyacrylamide (PAM) with various MW. Results showed that when PAM with MW of 6 and 12 million Da was chosen, compared with TF, residual turbidity of SEF decreased by 21.45% and 27.72%, respectively, in system I, EP; –7.50% and 13.20%, respectively, in system I, NCN; 12.86% and 9.38%, respectively, in system II, EP and –98.46% and 2.10%, respectively, in system II, NCN. In most cases, the fractal dimension of SEF floc was higher than that of TF floc. And SEF could not reduce frequency of small floc, which is not beneficial to the strengthening ability exertion of SEF. However, when using PAM with MW of 18 and 20 million Da, SEF could significantly reduce the frequency of small floc, and the fractal dimension of SEF floc was lower than that of TF floc. SEF residual turbidity of PAM with 18 and 20 million Da MW decreased by 22.21% and 22.89%, respectively, in system I, EP; 21.61% and 32.19%, respectively, in system I, NCN; 33.99% and 35.29%, respectively, in system II, EP and 18.28% and 28.15%, respectively, in system II, NCN. These findings suggest that PAM with high MW and EP status was more beneficial for SEF to exhibit the strengthening ability to TF than PAM with low MW and NCN status. In addition, the recovery factor of TF floc was larger than 1, while sludge-recycling exerted a flocculation enhancement role. This suggested that the recovery ability of broken flocs had definite indication effect on exertion of SEF strengthening ability.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Ganwei Zhang,Jianbin Lei,Longbo Wu,Chenchen Guo,Jialong Fang,Renbi Bai,Ian Wyman
A series of poly (imidazoled glycidyl methacrylate- co -diethylene glycol methyl ether methacrylate) copolymers (denoted as P (iGMA- co -MEO 2 MA)) with different monomer compositions were synthesized and characterized. These copolymers exhibit lower critical solution temperature (LCST) behaviors as the mole ratio of iGMA to MEO 2 MA in the copolymers range from 0/100 to 1/1, and upper critical solution temperature (UCST) behaviors when this mole ratio ranges from 4/1 to 10/1. The thermoresponsive behaviors of these copolymers were also investigated in water at different pH values. The LCST of the copolymer increased with the iGMA content in the copolymer at pH 6.5, and changed little at pH 7.0, while it decreased with the iGMA content in the copolymer at pH 7.5. Meanwhile, the UCST of the copolymer increased with the iGMA content in the copolymer at pH 6.5 and 7.0. In addition, the thermoresponsive properties of P (iGMA- co -MEO 2 MA) were influenced by the presence of salt and by the copolymer concentration. This paper offers a facile approach toward thermoresponsive materials with tunable LCST and UCST behaviors.
研究领域:
高分子化学
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材料科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Chun Bai,Kexin Li,Yanping Wang,Haining Liu,Huifang Zhang,Quan Li,Jun Li,Xiushen Ye,Zhijian Wu
ABSTRACT A novel boron flotation agent (N-2-hydroxyoctadecyl-N-Methylglucamine, NHO-NMDG) was fabricated using 1,2-epoxyoctadecane and N-methyl-D-glucamine. The obtained collector possesses both collecting and foaming properties and it was characterized by nuclear magnetic resonance, mass spectrometry, Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy methods. The flotation performance for boron removal from the salt lake brine has been studied. The flotation experiments indicated a highly effective removal of boron from the salt lake brine. The boron removal rate in the Da Qaidam brine could reach 67.08% by NHO-NMDG. The mechanism analysis shows that the meglumine group in the bifunctional flotation agent can be complexed with boron, and the long-chain alkyl group can attach to the surface of the bubble and enter into the bubble layer, so as to separate boron from the aqueous solution.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
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2014
·Vol. 2
·期 31
·12561-12570
·
IF 0
Jian Hua Chen,Hai Tao Xing,Hong Xu Guo,Wen Weng,Shi Rong Hu,Shun Xing Li,Yi Hong Huang,Xue Sun,Zhen Bo Su
In this study, we prepare a polyethyleneimine (PEI) and graphene oxide (GO) composite adsorbent through an amidation reaction between the amine groups of the PEI and the carboxyl groups of the GO. Adsorption performance of the PEI–GO was tested by removing Cr(VI) ions from aqueous solution. The physico-chemical properties of the GO, pristine and Cr(VI) ions-loaded PEI–GO were investigated by FT-IR, SEM-EDX and XPS methods. To investigate the adsorption kinetics of Cr(VI) ions onto this newly developed PEI–GO, we performed a batch of experiments under different adsorption conditions: content of the PEI in the PEI–GO, solution pH, initial Cr(VI) ion concentration, adsorption temperature and contact time. The prepared PEI–GO exhibited an encouraging uptake capacity of 539.53 mg g−1. The adsorption process was fast, within the first 1 h, Cr(VI) ion adsorption onto the PEI–GO was about 71%, and the adsorption equilibrium could be obtained within 14 h. Kinetics experiments indicated that the adsorption process could be described by the pseudo-second-order kinetic model. Furthermore, our adsorption equilibrium data fit the Langmuir isotherms well (R2 > 0.99). The removal mechanism of Cr(VI) ions from the solution consists of two steps: (1) Cr(VI) ions bind to the 4PEI–GO composite by electrostatic interaction between the negatively charged Cr(VI) ion species and the protonated amine groups of the 4PEI–GO; and (2) a few Cr(VI) ions were reduced to Cr(III) ions with the assistance of π electrons on the carbocyclic six-membered ring of the 4PEI–GO and then bind on the 4PEI–GO by the electrostatic attraction between Cr(III) ions and negatively charged groups (COO−) of the 4PEI–GO. Based on the results obtained in this work, it can be concluded that the prepared PEI–GO can be an effective and potential adsorbent for removing Cr(VI) ions from an aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Xuan Tang,Haidong Xu,Yuqing Shi,Mingwei Wu,Hongru Tian,Jie Liang
The porous antimicrobial starch particles containing N-Halamine functional groups (PST-MBA-Cl particles) were synthesized by a crosslinking polymerization between starch (ST) and N, N' -methylenebisacrylamide (MBA), and then a chlorination of amide groups of MBA . The synthetic process used only water as the solvent and was environmentally friendly. The results showed that under the optimal preparation conditions, the as-synthesized PST-MBA-Cl particles could have a Cl + % of 8.60 %. Antimicrobial tests showed that PST-MBA-Cl particles had very powerful antimicrobial efficacy against both Staphylococcus aureus and Escherichia coli and could completely kill Staphylococcus aureus with a concentration of 2.1 × 10 6 CFU/mL and Escherichia coli with a concentration of 5.6 × 10 6 CFU/mL within a contact time of one minute. Furthermore, the N-Halamine functional groups of PST-MBA-Cl particles also showed excellent stability under storage and reproducibility. Therefore, the as-synthesized PST-MBA-Cl particles will have potential applications in water disinfection.
研究领域:
生物材料学
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环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
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2015
·
IF 3.391
Wei-jun Zhao,Yonghuan Wang,Juan Li,Ling-feng Li,Qi Wang,Ke Han,Yuang Zhang,Xin Li,Peng Li,Jikui Luo,Xiaozhi Wang
This article presents a method for sensitive, fast and quantitative determination of melamine in milk and dairy products using high-field asymmetric ion mobility spectrometry (FAIMS). The solid-phase extraction (SPE) technology was used for purification after the sample was extracted by organic solvents, and followed by the analysis of FAIMS . The measurement parameters and variables that affect the FAIMS detection have been investigated, and optimum conditions have been obtained as follows: the carrier gas flow rate is 1.6 L min −1 , the headspace sampler temperature is 150 °C, the pressure is 1 atm, and the humidity is 2.0 g m −3 . The results showed that the SPE–FAIMS method can detect melamine in samples with a concentration down to 0.1 mg kg −1 . The ion intensity has a linear relationship with melamine concentration in the range from 0.3 mg L −1 to 25 mg L −1 , with a good linearity of 0.9975. The limits of detection (LOD) and limits of quantification (LOQ) are 0.1 mg kg −1 and 0.3 mg kg −1 in milk and dairy products, respectively, and the relative standard deviation is less than 8.0%. The results demonstrated that FAIMS has great potential as a powerful tool for food analysis and safety inspection.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
Yanxiong Ren,Dongdong Peng,Hong Wu,Leixin Yang,Xingyu Wu,Yingzhen Wu,Shaofei Wang,Zhongyi Jiang
In this study, a kind of functionalized graphene oxide (GO) membranes was fabricated. GO nanosheets were pre-coated by polydopamine (PDA) via spontaneous polymerization of dopamine (DA) and then cross-linked with zinc ions (Zn 2+ ) via dopamine-mediated complexation reaction. The PDA coating rendered GO nanosheets a large number of evenly distributed oxygen-containing functional groups, which are beneficial to bond zinc ions effectively and to create favorable microenvironments of the nanochannels in GO membranes. Both PDA and Zn 2+ acted as cross-linkers to tune the interlayer spacing of GO nanosheets. Zinc ions also afforded facilitated transport ability towards CO 2 in dry state. Taking CO 2 /CH 4 separation as the model system, the GO-PDA-Zn 2+ membrane exhibited significantly enhanced CO 2 permeance of 175 GPU with CO 2 /CH 4 selectivity of 19.1 in dry state owing to the large transport channels and facilitated transport carriers. Moreover, the GO-PDA-Zn 2+ membrane exhibited high CO 2 /CH 4 selectivity of 32.9 in wet state owing to the stable intergalleries and moderate interlayer spacing. It is envisioned that the synergistic manipulation of PDA and metal ions can be utilized to exploit a variety of 2D membranes with superior gas separation performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Peng Bai,Xinli Tong,Jun Wan,Yiqi Gao,Song Xue
The photocatalytic selective transformation of amines is a green and cost-effective technology to obtain value-added products in chemical industry. In this work, a series of bismuth-based photocatalysts including Bi 2 MoO 6 , Bi 2 WO 6 , Bi 5 O 7 Cl, Bi 5 O 7 Br, Bi 5 O 7 I, BiPO 4 , BiVO 4 , Bi 2 O 3 and various morphology Bi 2 O 2 CO 3 (flower-like, sponge-like, plate-like and spherical) were synthesized and employed in the aerobic oxidative coupling of benzylamine. It is found that flower-like Bi 2 O 2 CO 3 exhibited the highest photocatalytic activity, in which a 100% conversion of benzylamine with 99.0% selectivity of N -benzylidenebenzylamine was obtained at room temperature. Moreover, the photocatalytic oxidative coupling processes of various aromatic and aliphatic amines were further investigated, and excellent yields and selectivities of corresponding products are attained. Then, based on characterization results (XRD, SEM, BET and XPS, etc.) of catalyst, high photocatalytic activity of flower-like Bi 2 O 2 CO 3 is attributed to thin nanopetals, low band gap, the morphology and large specific surface area. Finally, a possible reaction mechanism is proposed for the photocatalytic oxidative coupling of benzyl amine.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Zhaojin Li,Conghao Shi,Pengfei Liu,Yunbo Di,Di Zhang,Qiujun Wang,Huilan Sun,Qujiang Sun,Bo Wang
Nano-silicon (n-Si)/graphite anodes are highly desirable for high-energy lithium-ion batteries. Nevertheless, the high surface energy of n-Si grains is prone to causing serious agglomeration. In this work, the modified n-Si is evenly dispersed on the g-C 3 N 4 carbon mesh that acquired through melamine heat treatment constructing an adaptive Si-carbon interconnection network structure (mSi 50 /g-C 3 N 4 ). Ideally, the mSi 50 /g-C 3 N 4 composite can be well dispersed and fill the gaps in graphite through traditional ball milling processes. The obtained mSi 50 /g-C 3 N 4 /Gr composite prevents the accumulation of Si grains which is beneficial for expediting ion transport, improving conductivity and structural stability . As a result, this anode provides a reversible capacity of 621 mAh⋅g −1 at 0.2 C, with high-capacity retention of 93.3 % after 300 cycles at 1 C and low volume expansion of only 28.6 %. Furthermore, it also maintains excellent cycling stability in full batteries with LiFePO 4 cathode. Therefore, constructing the mSi 50 /g-C 3 N 4 network is an effective strategy to achieve uniform dispersion of Si in graphite and promote larger scale industrialization of n-Si/graphite anode.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）