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三元乙丙橡胶 1

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Efficient removal of heavy metals from electroplating wastewater using polymer ligands

Md. Lutfor RAHMAN,Shaheen M. SARKAR,Mashitah Mohd YUSOFF

《环境科学与工程前沿（英文）》 2016年第10卷第2期页码 352-361 doi: 10.1007/s11783-015-0783-0

摘要： Poly(hydroxamic acid)-poly(amidoxime) chelating ligands were synthesized from poly(methyl acrylate-co-acrylonitrile) grafted acacia cellulose for removing toxic metal ions from industrial wastewaters. These ligands showed higher adsorption capacity to copper (2.80 mmol?g ) at pH 6. In addition, sorption capacities to other metal ions such as iron, zinc, chromium, and nickel were also found high at pH 6. The metal ions sorption rate (t ) was very fast. The rate of adsorption of copper, iron, zinc, chromium, nickel, cobalt, cadmium and lead were 4, 5, 7, 5, 5, 8, 9 and 11 min, respectively. Therefore, these ligands have an advantage to the metal ions removal using the column technique. We have successfully investigated the known concentration of metal ions using various parameters, which is essential for designing a fixed bed column with ligands. The wastewater from electroplating plants used in this study, having chromium, zinc, nickel, copper and iron, etc. For chromium wastewater, ICP analysis showed that the Cr removal was 99.8% and other metal ions such as Cu, Ni, Fe, Zn, Cd, Pb, Co and Mn removal were 94.7%, 99.2%, 99.9%, 99.9%, 99.5%, 99.9%, 95.6% and 97.6%, respectively. In case of cyanide wastewater, the metal removal, especially Ni and Zn removal were 96.5 and 95.2% at higher initial concentration. For acid/alkali wastewater, metal ions removing for Cd, Cr and Fe were 99.2%, 99.5% and 99.9%, respectively. Overall, these ligands are useful for metal removal by column method from industrial wastewater especially plating wastewater.

关键词： heavy metals adsorption wastewater chelating ligands plating industry

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Effect of Fe loading quantity on reduction reactivity of nano zero-valent iron supported on chelating

Jialu SHI,Shengnan YI,Chao LONG,Aimin LI

《环境科学与工程前沿（英文）》 2015年第9卷第5期页码 840-849 doi: 10.1007/s11783-015-0781-2

摘要： In this study, nanoscale zero-valent iron (NZVI) were immobilized within a chelating resin (DOW 3N). To investigate the effect of Fe loading on NZVI reactivity, three NZVI-resin composites with different Fe loading were obtained by preparing Fe(III) solution in 0, 30 and 70% (v/v) ethanol aqueous, respectively; the bromate was used as a model contaminant. TEM reveals that increasing the Fe loading resulted in much larger size and poor dispersion of nanoscale iron particles. The results indicated that the removal efficiency of bromate and the rate constant ( ) were decreased with increasing the Fe loading. For the NZVI-resin composite with lower Fe loading, the removal efficiency of bromate declined more significantly with the increase of DO concentrations. Under acidic conditions, decreasing the pH value had the most significant influence on NZVI-R3 with highest Fe loading for bromate removal; however, under alkaline conditions, the most significant influence of pH was on NZVI-R1 with lowest Fe loading. The effects of co-existing anions , and were also investigated. All of the co-existing anions showed the inhibition to bromate reduction.

关键词： nanoscale zero valent iron loading quantity reduction chelating resin bromated

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Effects of ancillary ligands in acceptorless benzyl alcohol dehydrogenation mediated by phosphine-free

《化学科学与工程前沿（英文）》 2023年第17卷第3期页码 314-325 doi: 10.1007/s11705-022-2219-2

摘要： Acceptorless alcohol dehydrogenation stands out as one of the most promising strategies in hydrogen storage technologies. Among various catalytic systems for this reaction, cost-effective molecular catalysts using phosphine-free ligands have gained considerable attention. However, the central challenge for using non-precious metals is to overcome the propensity of reacting by one-electron pathway. Herein, we synthesized a phosphine-free η⁵-C₅Me₅-Co complex by using the metal–ligand cooperative strategy and compared its activity with analogous catalysts toward acceptorless alcohol dehydrogenation. The catalyst showed excellent performance with a turnover number of 130.4 and a selectivity close to 100%. The improved performance among the class of η⁵-C₅Me₅-Co complexes could be attributed to the more accessible Co center and its cooperation with the redox-active ligand. To further study the systematic structure-activity relationship, we investigated the electronic structures of η⁵-C₅Me₅-Co complexes by a set of characterizations. The results showed that the redox-active ligand has a significant influence on the η⁵-C₅Me₅-Co moiety. In the meantime, the proximal O⁻/OH group is beneficial for shuttling protons. For the catalytic cycle, two dehydrogenation scenarios were interrogated through density functional theory, and the result suggested that the outer-sphere pathway was preferred. The formation of a dihydrogen complex was the rate-determining step with a ΔG value of 16.9 kcal∙mol^‒1. The electron population demonstrated that the η⁵-C₅Me₅ ligand played a key role in stabilizing transition states during dehydrogenation steps. This work identified the roles of vital ligand components to boost catalytic performance and offered rationales for designing metal–ligand cooperative nonprecious metal complexes.

关键词： acceptorless alcohol dehydrogenation η⁵-C₅Me₅-Co metal–ligand cooperation theoretical calculation

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Synthesis of iron(II) complexes with asymmetric N

Wolfgang Bauer, Tanja Ossiander, Birgit Weber

《化学科学与工程前沿（英文）》 2018年第12卷第3期页码 400-408 doi: 10.1007/s11705-018-1753-4

摘要：

The synthesis of new Schiff base-like ligands with asymmetric substituents pattern and their iron complexes with pyridine as axial ligand is described. Two of the ligands and one of the iron(II) complexes were characterized by single crystal X-ray structure analysis. One of the the iron(II) complexes shows spin crossover behavior while the others remain in the high spin state. The influence of the reduced symmetry of the ligand on the properties of the complexes is discussed.

关键词： iron Schiff base-like ligands magnetism spin crossover X-ray structures

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phosphate in an aqueous environment by an aluminum-based metal-organic framework with amido functionalized ligands

《环境科学与工程前沿（英文）》 2022年第16卷第12期 doi: 10.1007/s11783-022-1594-8

摘要：

● A novel Al-MOF was successfully synthesized by a facile solvothermal method.

关键词： Fluorescence Metal-organic framework Phosphate Detection Al-MOF

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Investigation of hydrolysis conditions and properties on protein hydrolysates from flatfish skin

Hua ZHANG, Hongji ZHU, Shipeng WANG, Weihua WANG

《化学科学与工程前沿（英文）》 2013年第7卷第3期页码 303-311 doi: 10.1007/s11705-013-1341-6

摘要： Response surface method (RSM), based on Box-Behnken design, was used to optimize the enzymatic hydrolysis conditions of flatfish skin protein hydrolysates (FSPH). Among the tested proteases, the combination of nutrase and trypsin was selected. The optimal hydrolysis conditions were as follows: pH 7.3, temperature 51.8°C, and the enzyme/substrate (E/S) ratio 2.5; under these conditions, the maximum peptide yield (PY) was 69.41±0.43%. The physiochemical analysis showed that the amino acids (His, Asp and Glu) of FSPH accounted for 18.15%, and FSPH was a mixture of polypeptides mostly distributed among 900–2000 Da. FSPH could exhibit a 93% chelating effect on ferrous ion at a concentration of 400 μg/mL, and also a notable reducing power. This study showed bioprocess for the production of FSPH for the first time, which had a good potential for valuable ingredients in the food, cosmetic and medicine industries.

关键词： flatfish skin protein hydrolysates metal chelating activity reducing power

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细胞行为在基质刚性和纳米拓扑结构上的生物物理调控 Review

Yong Yang, Kai Wang, 顾晓松,Kam W. Leong

《工程（英文）》 2017年第3卷第1期页码 36-54 doi: 10.1016/J.ENG.2017.01.014

摘要：

细胞外基质(ECM) 的刚性和纳米拓扑结构影响生物体发育及生理和病理进程因此，这些生物物理特征被用于调节细胞黏附铺展至增殖、分化的各种细胞行为。描述细胞行为的生物物理调节对合理设计新型生物材料植入物和医疗装置十分关键已有学者就基质刚和纳米拓扑结构特征对细胞行为的影响分别进行了综述，然，刚和纳米拓扑结构与细胞行为的交织影响尚未有人总结。此次，我们首次综述了基质刚性和纳米拓扑结构对细胞行为的影响，然后聚焦于生物物理信号从整合素到细胞核的细胞内传，并试图将细胞行为的细胞外调节与基质的生物物理学特征联系在起最后，我们讨论了在剖析细胞行为的生物物理调节和将基质的刚和纳米拓扑结构生物力学特转化到组织工程和再生医学时存在的挑战

关键词：细胞外基质刚性纳米拓扑结构黏附配体细胞行为

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核辐射技术及其在材料科学领域的应用

傅依备,许云书,黄玮,熊亮萍,高小铃,熊洁

《中国工程科学》 2008年第10卷第1期页码 12-22

摘要：

核辐射技术在材料科学领域得到了广泛的应用，利用辐射技术对无机材料、高分子材料进行改性和加工已成为一支新兴的高技术产业。综述了辐射技术在材料的改性和加工领域的应用研究进展，并详细介绍该单位在采用反应堆辐照技术研制碳化硅（SiC）陶瓷纤维、辐射交联法制备三元乙丙橡胶（EPDM）密封材料、辐射接枝合成偕胺肟型螯合树脂等方面开展的工作。

关键词：核辐射技术材料科学碳化硅陶瓷纤维三元乙丙橡胶偕胺肟型螯合树脂