ENERGY & FUELS
·
2021
·
IF 3.605
Minghui Zhang,Yingying Liu,Yingming Zhu,Kejing Wu,Houfang Lu,Bin Liang
The complexation of metal ions and amines can mediate the chemical equilibrium and the thermal effect between amines and CO2, thus promoting the absorption and desorption of CO2 in amine absorbents. In this work, the effects of Cu(II) on the performances of CO2 absorption and desorption in the Cu(II)–MMEA (2-(methylamino)ethanol)–H2O system were studied. The thermal desorption results show that the temperature increase during CO2 absorption can be mitigated in the presence of Cu(II), and the desorption performance of CO2 can be obviously improved at 75–95 °C. Using the thermal desorption at 85 °C, the CO2 desorption efficiency of MMEA solution containing 0.1 M [Cu] is 16.4% higher than that without cupric ions, and the regeneration energy consumption is reduced by 25%. The electrochemical research results indicate that the electrode structure and temperature affect the electrolysis rate of anodic copper, and the temperature is the key factor to enhance the CO2 desorption rate. Only considering the decomposition voltage, the energy consumption of the absorbent regeneration is 0.5 GJ/t CO2 at 50 °C, which is much lower than that of the thermal desorption method. The anode current efficiency is always about 100%. Increasing the temperature can increase the cathode current efficiency. When nickel foam with a large specific surface area is used as the cathode, the current efficiency can be increased to 100% at 50 °C. The CO2 desorption is significantly improved in a Cu(II)-assisted MMEA–H2O system. The electrochemical method can achieve a desired desorption at a relatively low temperature and greatly reduce the energy consumption of amine absorbent regeneration.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 6
·5136-5148
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IF 2.993
Zou Faxing,Chen Heng,Chen Shaojun,Zhuo Haitao
Shape-memory polymers with supramolecular switch have received increasing attention. This study reports the synthesis and characterization of supramolecular shape-memory polyurethane based on Cu(II)–pyridine coordination, obtained by mixing pyridine containing polyurethane with CuCl 2 . The results show that there are strong metal–ligand coordination interactions formed between Cu(II) and the pyridine ring in a series of CuCl 2 -doped polyurethane samples. The Cu(II)–pyridine coordination plays a crucial role in the enhanced physical netpoints for outstanding shape-memory properties. Indeed, the so-synthesized CuCl 2 -doped polyurethane exhibits not only a rapid tensile shape recovery but also excellent crimp shape recovery. The CuCl 2 -doped polyurethane containing suitable metal–ligand coordination interactions shows more than 99% shape fixation and more than 95% shape recovery. Our findings promote further applications of shape-memory polymers in multiple engineering fields.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Nana He,Lili Li,Panpan Wang,Junhao Zhang,Jiaqi Chen,Jie Zhao
Herein, titanium dioxide/chitosan/poly(lactide-co-caprolactone) (TiO 2 /CS/P(LLA-CL)) composite membranes with highly efficient adsorption of copper ions (Cu(II)) in aqueous solution were developed, through a facile electrospinning method. First, TiO 2 nanoparticles were ultrasonically dispersed in CS/P(LLA-CL) solution to get a uniform suspension. Afterwards, the mixture was applied for electrospinning to generate the smooth and bead-free composite membranes. The high adsorption capability of the composite membranes on Cu(II) was mainly attributed to the combination of TiO 2 nanoparticles, CS/P(LLA-CL) matrix and nanosized membrane. Among those, the TiO 2 /CS/P(LLA-CL) composite membrane with 2% TiO 2 content demonstrated the maximum adsorption capability (˜190.5 mg g −1 ) for Cu(II) from aqueous solution. Their adsorption behaviors were well conformed to pseudo-second-order kinetic model and Langmuir isotherm model. Moreover, FTIR and XPS results confirmed the existed chelation and ion exchange between the membrane and the Cu(II) during adsorption process. Due to its simplicity, effectiveness and stability in water, this type of composite membrane may serve as a promising environmentally-friendly and non-toxic adsorbent for removal of Cu(II) in aqueous.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jian Hua Chen,Hai Tao Xing,Xue Sun,Zhen Bo Su,Yi Hong Huang,Wen Weng,Shi Rong Hu,Hong Xu Guo,Wen Bing Wu,Ya Shan He
In the present paper a new type of triethylenetetramine-magnetite reduced graphene oxide (TET-MRGO) composite showing a high adsorption capacity (209.1 mg g −1 ) toward Cu(II) ions was prepared. The morphological, structural, and magnetic properties of TET-MRGO were characterized using infrared spectrometer, X-ray diffraction, Scanning Electronic Microscope, nitrogen adsorption–desorption measurement, Raman spectroscopy, and Transmission Electron Microscopy. TET-MRGO exhibits strong saturation magnetization (42.13 emu g −1 ) and can be easily separated from aqueous solution by an external magnetic field. A series of batch adsorption experiments were systematically conducted to study the adsorption property of TET-MRGO. The high adsorption capacity, excellent selectivity, and effective adsorption–desorption results indicated the prepared TET-MRGO composite could be an effective adsorbent for removing Cu(II) ions from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Xueye Wang,Zhiwei Wang,Haiqin Chen,Zhichao Wu
Efficient removal of toxic metals using low-pressure membrane processes from contaminated waters is an important but challenging task. In the present work, a conducting microfiltration membrane prepared by embedding a stainless steel mesh in the active layer of a polyvinylidene fluoride membrane is developed to remove Cu(II) ions from contaminated waters. Results showed that the conducting membrane had favorable electrochemical properties and stability as cathode. Batch tests showed that Cu(II) removal efficiency increased with the increase of voltages and leveled off with the further enhancement of electric field. The optimal voltages were determined to be 1.0 V and 2.0 V for the influent Cu(II) concentrations of 5 mg/L and 30 mg/L, respectively. X-ray photoelectron spectroscopy and X-ray diffraction results demonstrated the presence of Cu(0) and Cu(OH) 2 on the membrane surface. The removal mechanisms involved the intrinsic adsorption of membrane, electrosorption of membrane, adsorption of deposited layer, chemical precipitation of Cu(OH) 2 and deposition of Cu(0) which were aided by electrophoresis and electrochemical oxidation-reduction. Long-term tests showed that the major contributors for Cu(II) removal were the deposition of Cu(0) by electrochemical reduction-oxidation (47.3% ± 8.5%) and chemical precipitation (41.1% ± 0.2%), followed by electrosorption, adsorption by the fouling layer and membrane intrinsic sorption.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 84
·53135-53144
·
IF 3.108
Changjiang Yu,Miao Wang,Xinyu Dong,Zaifeng Shi,Xiaopeng Zhang,Qiang Lin
Magnetic microspheres (MM) were prepared using calcium alginate (CA) encapsulated biochar (BC) and Fe3O4 as a high-performance green absorbent for Cu(II) removal from aqueous solution. The effects of the initial Cu(II) concentration, initial pH value of the Cu(II) solution and equilibrium contact time were investigated. The results revealed that the adsorption capacity of MM was approximately 3 times higher than that of the magnetic biochar (MBC). The adsorption of Cu(II) by the MM was in good agreement with pseudo-second-order kinetics. The overall orders for fitting the isotherm models are Langmuir > Freundlich for Cu(II). Mechanism studies showed that coordination and ion exchange were the major mechanism for Cu(II) removal by the MM. Moreover, the presence of the magnetic particles in the microspheres allowed easy separation of the material from aqueous solutions. This study provides an effective method for biochar modification.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Xi Peng,Xing Hu,Kai Liu,Deming Gong,Guowen Zhang
Inhibition of advanced glycation end products (AGEs) formed in protein glycosylation is crucial for minimizing diabetic complications. Herein, the anti-glycation potential of hesperetin-Cu (II) complex was investigated. Hesperetin-Cu (II) complex strongly inhibited three stages glycosylation products in bovine serum albumin (BSA)-fructose model, especially for the inhibition of AGEs (88.45%), which was stronger than hesperetin (51.76%) and aminoguanidine (22.89%). Meanwhile, hesperetin-Cu (II) complex decreased the levels of BSA carbonylation and oxidation products. 182.50 µg/mL of hesperetin-Cu (II) complex inhibited 66.71% β-crosslinking structures of BSA, and scavenged 59.80% superoxide anions and 79.76% hydroxyl radicals. Moreover, after incubating with methylglyoxal for 24 h, hesperetin-Cu (II) complex removed 85.70% methylglyoxal. The mechanisms of protein antiglycation by hesperetin-Cu (II) complex may be through protecting structure, trapping methylglyoxal, scavenging free radicals and interacting with BSA. This study may contribute to the development of hesperetin-Cu (II) complex as a functional food additive against protein glycation.
研究领域:
生物化学
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药理学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Jiewen Deng,Jieli Ou,Zhenran Wang,Yongsheng Fu,Yiqing Liu
Since limitedly existing researches suggested Cu(II) had deficiently catalytic ability to PAA, in this work, we tested the oxidation performance of Cu(II)/PAA system on diclofenac (DCF) degradation under neutral conditions. It was found that overwhelming DCF removal could be obtained in Cu(II)/PAA system at pH 7.4 using phosphate buffer solution (PBS) compared to poor loss of DCF without PBS, and the apparent rate constant of DCF removal in PBS/Cu(II)/PAA system was 0.0359 min − 1 , 6.53 times of that in Cu(II)/PAA system. Organic radicals (i.e., CH 3 C(O)O• and CH 3 C(O)OO•) were evidenced as the dominant contributors to DCF destruction in PBS/Cu(II)/PAA system. PBS motivated the reduction of Cu(II) to Cu(I) through chelation effect, and then the activation of PAA by Cu(I) was facilitated. Besides, due to the steric hindrance of Cu(II)-PBS complex (CuHPO 4 ), PAA activation was mediated from non-radical-generating pathway to radical-generating pathway, leading to desirably effective DCF removal by radicals. The transformation of DCF mainly experienced hydroxylation, decarboxylation , formylation and dehydrogenation in PBS/Cu(II)/PAA system. This work proposes the potential of coupling of phosphate and Cu(II) in optimizing PAA activation for organic pollutants elimination .
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 86
·45753-45759
·
IF 3.708
Haiyan Wang,Yutong Gong,Yong Wang
Carbon aerogels have attracted considerable attention in fundamental investigation and potential applications in a myriad of fields. We present a novel approach for the synthesis of cellulose-based carbon aerogels by dissolution, gelation, regeneration, freeze-drying and carbonization of cellulose. The carbon aerogels obtained here possess the characteristics of high surface area (500 m2 g−1), hydrophobicity, and fire-resistance. In addition, the carbon aerogels show excellent adsorption capacity and selectivity for removal of oils, organic solvents, a variety of dyes, and heavy ions, so they could be used as promising adsorbents for sewage treatment. Especially for malachite green and Cu(II), the adsorption capacities can reach up to 1947 mg g−1 and 801 mg g−1, respectively, which far surpass other aerogels previous reported.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Linyue Zhang,Jiewen Deng,Jieli Ou,Gaofeng Zhou,Yongsheng Fu,Yiqing Liu
In this paper, it was found that boric acid (BA) could improve the degradation of rhodamine B (RhB) by Cu(II)-activated peroxymonosulfate (PMS). At pH 8.5, the addition of BA could stabilize pH and generate the highly active complexes with Cu(II), which could accelerate the reduction of Cu(II) by PMS. The formed Cu(I) could activate PMS to form sulfate radical (SO 4 – ) and/or be oxidized to Cu(III). According to the results on radical scavenging experiments, SO 4 – and Cu(III) both participated in the degradation of RhB in BA/Cu(II)/PMS system. Because the binding ability of BA with Cu(II) is pH-dependent, the promotion effect of BA in Cu(II)/PMS process occurred only under weakly alkaline conditions. The presence of HCO 3 – and natural organic matter (NOM) both had an inhibition effect on RhB degradation in BA/Cu(II)/PMS system, while Cl – could promote the removal of RhB. This study provides a new idea to enhance PMS activation by Cu(II).
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 21
·26621-26630
·
IF 3.056
Wan Jun,Chen Lin,Li Qiang,Ye Yuxuan,Feng Xiaonan,Zhou Aijiao,Long Xuejun,Xia Dongsheng,Zhang Tian C.
Among the Cu(II) removal methods, adsorption is a favorable technique and has attracted large attention because of its effectiveness and low cost. In quest of seeking for a favorable adsorbent with a high Cu(II) adsorption capacity and excellent reusability, researchers have paid much attention to hydrogels with three-dimensional networks. In this study, a novel hydrogel (P(AMPS-co-VDT) hydrogel) based on free-radical polymerization was synthesized with ionic monomer sodium 2-acrylamido-2-methylpropane sulfate (AMPS-Na + ) and 2-vinyl-4, 6-diamino-1, 3, 5-triazine (VDT) and applied for Cu(II) adsorption in aqueous solutions. The hydrogel was characterized for swelling performance, surface morphology, functional groups, thermal gravimetric behavior, and elements. The maximum Cu(II) adsorption capacity (175.75 mg/g) was relatively high compared with other hydrogels. The P(AMPS-co-VDT) hydrogel also was found to have a relatively good Cu(II) desorption and reuse behavior. The adsorption mechanism could be chelation and ion exchange. This work provides a new hydrogel for effective Cu(II) removal in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 29
·期 6
·1727-1741
·
IF 3.667
Peng Xilong,Li Yue,Liu Shuang,Jiang Tian,Chen Wenjin,Li Dan,Yuan Jiren,Xu Feigao
In this experiment, chitosan (CS), waste limestone and diammonium hydrogen phosphate were used as raw materials to synthesize HAp-coated-stone composites/CS by one-step blending method. Then, the prepared HAp-coated-stone composites/CS composite material was used to remove Cu (II) in the solution. The structure and microstructure of the composite were characterized by Fourier transform infrared spectroscopy, X-ray diffraction analysis, Scanning Electron Microscopy, Brunauer–Emmett–Teller and Thermogravimetric Analysis. The results showed that with the addition of CS, the overall thermal stability of the composite improved, while its specific surface area decreased. Moreover, the composite was a mesoporous material. HAp-coated-stone/CS composites with small amounts of CS (0.5%) can remarkably increase Cu (II) removal. The HAp-coated-limestone/CS-0.5% had better resistance to pH changes compared with HAp-coated-limestone. Under the initial concentration of 20 mg/L, the maximum adsorption capacity for Cu (II) adsorption by HAp-coated-limestone/CS-0.5% was about 130.75 mg/g at 40 °C. The equilibrium data and kinetic were well described by Freundlich models and pseudo-second-order, respectively. The possible mechanisms for Cu (II) adsorption onto HAp-coated-stone/CS composites surface have been proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
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