International Journal of Environmental Science and Technology
·
2021
·Vol. 19
·期 8
·7205-7216
·
IF 2.86
Wu Chunlai,Liu Qiong,Peng Chuanyun,Xu Wenwen
In this work, novel glutamic acid-functionalized SBA-15 was prepared for sensitive and selective lead and copper ions removal from wastewater sample. The material was characterized by X-ray diffractometry, scanning electron microscope, Brunauer–Emmett–Teller surface area measurement and Fourier transform infrared spectroscopy. The as-prepared material maintains the coordination properties of glutamic acid to lead and copper ions and exhibited better adsorption performance than that of pure SBA-15. The effects of different parameters such as pH of the solution, adsorption time, initial concentration, ion selectivity and regeneration were investigated on the Pb(II) and Cu(II) adsorption by the prepared adsorbent. It was found that the adsorption process can reach equilibrium within 20 min and can be described by pseudo-second-order kinetic model. Adsorption isotherm analysis showed that the adsorption was in accordance with Langmuir adsorption isotherm model, and the maximum adsorption capacity of lead and copper ions was 12.14 mg/g and 13.29 mg/g, respectively. In addition, common co-existed ions have no interference on Pb(II) and Cu(II) adsorption. Moreover, adsorption–elution cyclic results demonstrated that Pb(II)- and Cu(II)-adsorbed composite adsorbent could be effectively regenerated by 0.5 mol/L of HCl, and the regenerated adsorbent could be employed for repeated use without significant deterioration in its real performances, demonstrating the good stability of the adsorbents. Therefore, the composite adsorbent can be used potentially to remove Pb(II) and Cu(II) ions from water samples in practical applications for environmental remediation. Graphic abstract Glutamic acid-functionalized SBA-15 can be used as adsorbent for efficient adsorption/desorption of Pb(II) and Cu(II) from wastewater.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 31
·17601-17614
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IF 4.22
Weng Chengjie,Li Wen,Wu Jian,Shen Liming,Yang Wenzhong,Deng Cong,Bao Ningzhong
Abstract The fabrication of epoxy/graphene composites with greatly enhanced thermal conductivity ( K ) in terms of efficient thermal dissipation of electronic devices has drawn much interest. However, the lack of continuous thermal conductive paths and thermal interface resistances generated between matrix and fillers limit the further enhancement of the K value. Here, a siloxane cross-linked graphene framework (SGF) with highly conductive paths is prepared by a simple way, i.e. , thermal-shock exfoliation of graphene oxide film followed by self-polymerization of silanol inside GF. The epoxy (EP) resin was then impregnated into SGF to form the EP/SCF composite. The mutual percolation of EP and SGF in the composite eliminates the distribution issue of graphene sheets. The siloxane molecular network not only cross-links adjacent graphene sheets, but also forms chemical bonding with EP matrix, resulting in significantly decreased inter-sheet and interface thermal resistances. The EP/SGF composite containing 20.2 wt% graphene exhibits an in-plane K of 54.2 W m –1 K –1 , which is about twice higher than that of EP/GF without siloxane and 270 times higher than pure EP. Graphical Abstract
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Nature Biomedical Engineering
·
2021
·Vol. 5
·期 10
·1189-1201
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IF 25.671
Xie Renjian,Yao Hang,Mao Angelina S.,Zhu Ye,Qi Dawei,Jia Yongguang,Gao Meng,Chen Yunhua,Wang Lin,Wang Dong-An,Wang Kun,Liu Sa,Ren Li,Mao Chuanbin
The early stages of progressive degeneration of cartilage in articular joints are a hallmark of osteoarthritis. Healthy cartilage is lubricated by brush-like cartilage-binding nanofibres with a hyaluronan backbone and two key side chains (lubricin and lipid). Here, we show that hyaluronan backbones grafted with lubricin-like sulfonate-rich polymers or with lipid-like phosphocholine-rich polymers together enhance cartilage regeneration in a rat model of early osteoarthritis. These biomimetic brush-like nanofibres show a high affinity for cartilage proteins, form a lubrication layer on the cartilage surface and efficiently lubricate damaged human cartilage, lowering its friction coefficient to the low levels typical of native cartilage. Intra-articular injection of the two types of nanofibre into rats with surgically induced osteoarthritic joints led to cartilage regeneration and to the abrogation of osteoarthritis within 8 weeks. Biocompatible injectable lubricants that facilitate cartilage regeneration may offer a translational strategy for the treatment of early osteoarthritis.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 8
·2293-2301
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IF 3.186
Liu Xueping,Shi Shengbin,Yang Su,Gu Liuyu,Gao Lijing,Zhang Jin,Xiao Guomin
Using etherification to convert glycerol into biofuel additives is an effective way to solve the current problem of excess glycerol. In this study, a series of environmentally friendly (x)HPW/ZrO 2 catalysts were synthesized for the etherification of glycerol and tert-butyl alcohol (TBA). The internal microstructure and acidity analysis of the synthesized samples were derived from BET, XRD, Raman spectroscopy, FTIR, SEM, NH 3 -TPD and Py-FTIR. The results revealed that the synthesized catalysts retained the complete Keggin structure of phosphotungstic acid (HPW) which supported on it. The (15)HPW/ZrO 2 catalyst with suitable structure and acidity had an excellent catalytic effect on the etherification reaction. Driven by the (15)HPW/ZrO 2 catalyst, the optimal reaction conditions were determined from parameters of reaction temperature, time, molar rate of glycerol and TBA, and catalyst dosage. 93.2% glycerol conversion and 42.5% selectivity of multi-substituted tert-butyl glycerol ethers (DTBG + TTBG) were obtained under optimal conditions. In addition, even after a total of four consecutive reactions, (15)HPW/ZrO 2 catalyst still demonstrated relatively good catalytic activity. Graphic Abstract
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高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-10
·
IF 4.38
Chen Huanyu,Cai Ping,Feng Yue,Sun Zhanliang,Wang Yinwen,Chen Yue,Zhang Wei,Liu Nan,Zhou Zhijun
68 Ga-radiolabeled small molecules that specifically target prostate-specific membrane antigen (PSMA) have been extensively investigated, and some of these tracers have been used in the diagnosis of prostate cancer via 68 Ga-positron emission tomography ( 68 Ga-PET). Nevertheless, current 68 Ga-labeled radiotracers show only fair detection rates for metastatic prostate cancer lesions, especially those with lower levels of prostate specific antigen (PSA), which often occurs in the biochemical recurrence of prostate cancer. The goal of this study was to design and synthesize a new PSMA-targeted radiotracer, 68 Ga-SC691, with high affinity for prostate cancer cells and excellent pharmacokinetics. To this end, structural optimization was carried out on the bifunctional group, target motif, and linker while the high affinity targeting scaffold remained. To explore its potential in the clinic, a comparative study was further performed in vitro and in vivo between 68 Ga-SC691 and 68 Ga-PSMA-11, a clinically approved tracer for PSMA-positive prostate cancer. SC691 was radiolabeled to provide 68 Ga-SC691 in 99% radiolabeling yield under mild conditions. High uptake and a high internalization ratio into LNCaP cells were observed in in vitro studies. In vivo studies showed that 68 Ga-SC691 had favorable biodistribution properties and could specifically accumulate on PSMA-positive LNCaP xenografts visualized by micro-PET/CT. This radiotracer showed excellent PET imaging quality and comparable, if not higher, uptake in LNCaP xenografts than 68 Ga-PSMA-11.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2483-2501
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IF 4.682
Chen Yuan,Zhang Shengchang,Jiang Chunhui,Zhong Tianhaoyue,Su Zexi,Xu Qibin,Jiang Mengjin,Liu Pengqing
In order to prevent secondary pollution due to the photocatalyst titanium dioxide (TiO 2 ) used in industrial wastewater treatment, and to boost the photo-removal efficiency TiO 2 was immobilized on the surface of high-performance poly (ether ketone) (PEEK) hollow fiber membrane via an in-situ grafting reaction. γ -Methylacryloyloxypropyltrimethoxysilane (MAPS) was used as a coupling agent to link the PEEK hollow fiber membranes with TiO 2 under UV radiation and hydrothermal treatment. The surface chemical structure, surface morphologies, and permeability of the PEEK-PMAPS-TiO 2 membranes were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and the water flux test. The performance of PEEK-PMAPS-TiO 2 membranes in terms of their ability to accelerate the photo-removal of different dyes was investigated under a range of pH conditions. Experimental results showed that the photo-degradation efficiency for tartrazine can be reached 100% (after 4 h of UV radiation at pH of 3.5) with a TiO 2 grafting degree of 15.56 wt% on the composite membranes. We also find that the acidic/alkaline condition accelerates the processes of absorption and photo-removal of negatively/positively charged dyes. In addition, the recyclability of the PEEK-PMAPS-TiO 2 membrane was also investigated. After refreshing treatment, the second photo-removal efficiency still reached over 95%. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3452-3467
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IF 4.682
Du Chunxiao,Liu Gaoyang,Qu Zhongji,Wang Wei,Yu Dan
Over the years, graphene oxide (GO) with unique permeability and selectivity has been extensively researched for hydrophilic enhancement modification, especially as the separation layer of oil–water separation composite membranes. However, the poor stability caused by hydration of GO, and the low water flux caused by the lamellar compaction limit its application. In this study, a surface modification strategy based on metal polyphenol coordination was proposed to address these problems by co-deposition of tannic acid-graphene oxide (TA-GO) and TiO 2 on electrospun polyvinylidene fluoride (PVDF) membrane. TiO 2 was inserted into GO layers to expand the interlayer spacing and prevent membrane compaction. Moreover, the interlayer force was enhanced by TA and Fe 3+ through covalent bonds, cation-π, and coordination bond. The results demonstrated that the underwater oil contact angle of resultant composite membrane reached 152.5°. In addition, it has a high flux (243.11 L/h·m 2 ·bar) and oil (> 98%)/salt (> 47%) rejection, which can be maintained even after ultrasonic treatment for 30 min. This work proposed a practical and environmental approach to construct a steady GO-modified hydrophilic membrane. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2870-2882
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IF 4.682
Han Ni,Xu Shishi,Zhang Qinfang
The Bi 2 MO 4 Cl (M = Gd and Nd) nanosheets were prepared by a molten salt flux method for the first time. The resulted Bi 2 GdO 4 Cl (F-BG) nanosheets showed the highest photocatalytic activity for oxygen (O 2 ) evolution and trypan blue (TB) degradation than Bi 2 NdO 4 Cl (F-BN), Bi 2 GdO 4 Cl (S-BG) and Bi 2 NdO 4 Cl (S-BN) synthesized by a solid-state method. The F-BG nanosheets showed the larger specific surface areas and abundant pores, which could provide more reactive sites. The photoelectrochemical and photoluminescence (PL) results revealed that F-BG sample had the excellent separation and transfer rates of photogenerated charge carriers, leading to the highly photocatalytic performance for both O 2 evolution and TB degradation. The UV–Vis diffuse reflectance spectra (DRS) showed all samples had the visible-light-responsive characteristic. The radical trapping experiment revealed hole (h + ) played a major role, while superoxide radical ( \(\cdot {\text{O}}_{{2}}^{ - }\) ) contributed a little to photocatalytic degradation process. Thus, a possible photocatalytic mechanism was proposed based on the radical trapping experiment. This work shows us a useful insight into the preparation of highly active bismuth-based oxyhalide nanosheets photocatalysts by a molten salt synthesis through surface modification and morphology control and provides the possibility of water splitting under visible light.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2528-2539
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IF 4.682
Ye Zhenda,Zhao Xi,Yu Weitai,Chen Ying,Lin Pengcheng
Thermal conductive composite materials (TCCMs) applied in the thermal management are of ever-rising significance with the rapid development of a variety of thermal-related industrial products. Previously, the demand for TCCMs with differential thermal conductivity is generally met by using two strategies, tuning the material composition and designing the composite microstructure. However, the miscibility between different components is usually poor, resulting in the uniformity of thermal conductivity of TCCMs. In this work, the flexible reduced graphene oxide@calcium alginate (RGO@CA) composite fibers are fabricated by wet spinning of the lyotropic graphene oxide composite liquid crystals and wet chemical reduction. The resulted RGO@CA composite fibers exhibit high tensile strength of about 200 MPa. The graded utilization of the waste heat can be realized by using RGO@CA composite fibers with different compositions. The displayed utilizations of the waste heat include thermal energy storage, optical sensor, thermal source for chemical reaction. The proposed liquid crystal spinning demonstrates a novel strategy for developing advanced materials toward the thermal management and waste heat recovery of electronic devices and systems. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 3
·1810-1832
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IF 4.682
Cen Hongyu,Wu Chonggang,Chen Zhenyu
Extension of corrosion inhibitors from traditional molecular-scale to nanoscale will not only be significant to develop green and efficient inhibitors, but also supplement the discipline system of corrosion inhibitors. However, many research on the interfacial behavior of nano-inhibitors have ignored the special colloidal properties of nanoparticles and show no obvious differences with traditional inhibitors. In this study, graphene oxide (GO) was functionalized with polydopamine (PDA) via covalent modifications and self-polymerization, and GO-PDA was studied as a corrosion inhibitor of carbon steel in HCl solution. Diversified measurements confirmed that GO-PDA can effectively protect carbon steel from corrosion, and the inhibition efficiency almost reached 90% at 100 mg/L. Interfering factors including immersion time and concentration were investigated. The lamellar nanoparticles adsorbed on the surface of carbon steel have formed a hydrophobic film in micro-nano structures. The transition from a negative charge on the GO surface to a positively charged GO-PDA contributed to adsorption at the interface. An initial model of nano-inhibitor was established to explicate the inhibition mechanism. Graphical abstract
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-9
·
IF 5.833
Yang Dezhi,Li Qiulan,Zhang Qian,Wang Yijie,Li Hong,Tammina Sai Kumar,Yang Yaling
An Au-based nanozyme composite (AuNPs/Cu,I) was constructed by using Cu,I-doped carbon dots (Cu,I-CDs) as the reducing agent as well as the nanozyme. Notably, AuNPs/Cu,I nanozyme not only possessed the intrinsic activity of mimicking enzymes of superoxide dismutase, peroxidase, and catalase at different conditions but was also employed as surface-enhanced Raman spectroscopy (SERS) enhancer. The combination of Cu,I-CDs and AuNPs promoted the electron transferability, leading to increased peroxidase-like activity and superoxide-like activity. Compared to the individual Cu,I-CDs and AuNPs nanozyme, the AuNPs/Cu,I composite demonstrated promising peroxidase-like activity by transferring electrons instead of generating OH. Interestingly, the multienzyme-like activity of AuNPs/Cu,I nanozyme could be finely tuned by changing the composition of Cu 0 /Cu + and Au. The tert -butyl hydroquinone (TBHQ) as the substrate could be catalyzed with AuNPs/Cu,I nanozyme to produce red substances, resulting in a significant Raman enhancement effect at the same time, showing good linear range from 0.11 to 10 mg L −1 . Overall, the current investigation provides a flexible and controllable way to design multifunctional nanozymes along with the Raman enhancement strategy based on the catalysis of nanozyme. Graphical abstract
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PubMed
高影响因子
Silicon
·
2021
·Vol. 14
·期 13
·7473-7481
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IF 2.67
Zeng Nengyuan,Zhao Hongdong,Liu Yuling,Wang Chenwei,Luo Chong,Wang Wantang,Ma Tengda
The colloidal silica is used as the abrasive for the copper Chemical Mechanical Polishing slurry in integrated circuit multilayer copper wiring. The aggregation of colloidal silica in the slurries tends to aggregate spontaneously, resulting in the continuous changes of the polishing effect, such as scratch defects, removal rate, etc. This situation can lead to the potential instability of the polishing slurry, which should be avoided in industrial production. In this paper, the aggregation and dispersion properties of polishing slurries were systematically studied, and an scheme was proposed to improve the dispersion of slurries to prevent agglomeration. These affecting factors including slurries’ pH, Potassium nitrate and Sodium Polyacrylate were assessed with Large particle counts, Zeta potential and Particle size. Slurry’s pH at 9.6 had a lower Zeta potential which meant a higher dispersion colloidal silica compared to other pH of slurries. And the dissolution of colloidal silica was verified by UV-vis experiment. Sodium dodecyl sulfate, Dodecyl trimethyl ammonium chloride and Primary Alcobol Ethoxylate-15 were analyzed for their dispersion in slurries from the point of view of static electricity and steric hindrance, and the synergistic mechanism of mixed Sodium dodecyl sulfate and Primary Alcobol Ethoxylate-15 on slurries dispersion was highlighted. In addition, the effect of the improvement of slurry dispersion on reducing scratching defects on the surface of polished copper blanket was also tested in this paper.
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