ULTRASONICS SONOCHEMISTRY
·
2023
·
IF 8.4
Monireh Alimohamadi,Alireza Khataee,Samira Arefi-Oskoui,Behrouz Vahid,Yasin Orooji,Yeojoon Yoon
This study aims to investigate the sonocatalytic activation of hydrogen peroxide (H 2 O 2 ) using Cr 2 AlC MAX phase prepared by the reactive sintering process. The hexagonal structure of the crystalline MAX phase was confirmed by X-ray diffraction. Moreover, the compacted layered structure of the MAX phase was observed via scanning electron microscopy and high-resolution transmission electron microscopy. Under the desired operating conditions, Cr 2 AlC MAX phase (0.75 g/L) showed suitable potential to activate H 2 O 2 (1 mmol/L) under sonication, thereby allowing a considerable removal efficiency for various organic pollutants, including dimethyl phthalate (69.1%), rifampin (94.5%), hydroxychloroquine (100%), and acid blue 7 (91.5%) with initial concentration of 15 mg/L within 120 min of treatment. Kinetic analysis proved that the degradation reaction followed pseudo-first-order kinetics. Scavenging tests demonstrated that hydroxyl radicals and singlet oxygen were effective species during degradation. Furthermore, a probable mechanism for dimethyl phthalate degradation was suggested according to gas chromatography-mass spectroscopy and nuclear magnetic resonance analyses. The obtained results confirmed the capability of the triple Cr 2 AlC/H 2 O 2 /US process as a promising method for treating contaminated water.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shizong Wang,Jianlong Wang
Carbon-based catalysts have been widely investigated in the field of advanced oxidation processes (AOPs), however their structural stability during the AOPs has been neglected. In this study, the decomposition of different carbonaceous materials, including g-C 3 N 4 , biochar, biochar/g-C 3 N 4 composite, graphene oxide and COF in sulfate radical-based and hydroxyl radical-based AOPs was investigated, mainly focusing on g-C 3 N 4 and modified g-C 3 N 4 in peroxymonosulfate (PMS)-based AOPs. The g-C 3 N 4 prepared with different precursors and modified g-C 3 N 4 were selected to investigate their structural stability in PMS-based AOPs in detail. The results showed that both g-C 3 N 4 and modified g-C 3 N 4 were partially decomposed in the PMS-based AOPs leading to the carbon dissolution in solution. The concentration of dissolved carbon varied with the precursor of g-C 3 N 4 and experimental conditions such as PMS concentration and inorganic ions. Modified g-C 3 N 4 presented higher concentration of dissolved carbon than pristine g-C 3 N 4 . Based on the results of experiments and characterization, the decomposition of g-C 3 N 4 and modified g-C 3 N 4 were mainly due to their interaction with PMS. Modified g-C 3 N 4 had higher adsorption capacity for PMS than pristine g-C 3 N 4 leading to the enhanced interaction with PMS. The dissolved carbon from modified g-C 3 N 4 would not affect the removal efficiency, but the mineralization efficiency of targeted organic pollutants. In addition, the dissolved components of g-C 3 N 4 and modified g-C 3 N 4 showed acute toxicity. In addition to g-C 3 N 4 -based catalysts, other materials such as covalent organic compound and graphene oxide could be also decomposed partially. The decomposition of g-C 3 N 4 was also found in the peroxydisulfate and hydrogen peroxide-based AOPs. This study provided insight into the structural stability of g-C 3 N 4 -based catalysts in the PMS-based AOPs, which deserved much attention in the future studies from the point view of the design and environmental application of g-C 3 N 4 -based catalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Xiaolong Yuan,Xiang Gao,Tao Zheng,Jing Wang,Yibei Dong,Huidan Xue
The feasibility and efficiency of carbon nanomaterials (CNMs) in algal biotechnology are less known. In this study, the influences of four CNMs, graphene (G), graphene oxide (GO), multiwalled carbon nanotube (MWCNT), and aminated multiwalled carbon nanotube (MWCNT-NH 2 ), on cell growth and exopolysaccharide (EPS) production, as well as the physiochemical properties of EPS, were investigated in cell culture of Nostoc flagelliforme . A proper concentration (15 mg L −1 ) of four CNMs was chosen for use after a preliminary test. Upon GO treatment, the biomass was improved by 11.1 % and the EPS production was increased by 36.1 % on day 16 compared to the nontreated control. Four CNM treatments significantly improved cellular O 2 · − and H 2 O 2 levels as well as superoxide dismutase and catalase activities. The monosaccharide compositions and functional groups of the EPSs were obviously altered by the CNM treatments. Particularly, the GO treatment-resulting EPS showed obviously improved flocculating ability, water absorption ability, and reactive oxygen species scavenging ability. In general, four CNMs exerted distinct influences on the production and physio-chemical property alteration of the EPS in N. flagelliforme culture. This work expands our understanding of the application of CNMs in the induced production and functional modification of polysaccharides during algal cultivation.
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ACS Omega
·
2022
·
IF 4.132
Chenguang Yang,Jianqiang Yin,Liqin Wu,Qiuyu Zeng,Liwei Zhang
For coal and gangue, intelligent sorting processes for separation, the use of coal and gangue mineral components with different fundamental differences, and the study of different properties of minerals and coal with different scales and density regarding the gray value change law are presented. The results show that the gray value of single minerals and mixed minerals gradually decreases with the increase of their thickness and density. The greater the density of minerals, the smaller the gray value at the same thickness, and the same rule applies to different coal ranks. Via regression analysis methods, the values of the regression equation parameter a of pure minerals for graphite, quartz, kaolinite, and montmorillonite are 59.25, 65.69, 61.61, and 58.02 in the high-energy region, respectively. In the low-energy region, they are 174.95, 177.31, 186.95, and 161.81. For the regression equation parameter of mixed minerals in the form of two mixed minerals (graphite and quartz, kaolinite, or montmorillonite) and three kinds of mineral mixing (graphite–kaolinite and quartz; graphite–montmorillonite and quartz; graphite–kaolinite and montmorillonite), the gray values are 151.12, 156.00, 153.13,152.43, 152.98, and 151.98 in the high-energy region, respectively; in the low-energy region, they are 193.34, 201.34, 192.93, 191.26, 194.68, and 193.08. The phenomenon for the gray range of two kinds of single minerals locates in the range of mixed minerals that was formed from a single mineral observed after the regression equation of mixed mineral was verified by a single mineral, which agrees with the X-ray recognition pattern. In the end, as the density of coking coal, fat coal, and gas coal increases, the gray value decreases, which was in agreement with single- and mixed-mineral analyses.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1571-1578
·
IF 2.8
Zhang Sheng-Feng,Li Jing,Wei Mei-Jie,Kong Fen-Ying,Zhang Rui,Wang Zhong-Xia,Fang Hai-Lin,Wang Wei
Herein, a fast, inexpensive, and sensitive electrochemical approach for the quantification of 6-gingerol in the ginger samples was established. Au nanoparticles-ZnO-reduced graphene oxide (AuNPs-ZnO-rGO) nanocomposites were fabricated and employed as electrode-modified materials to improve the sensitivity of the determination. UV–visible (UV–vis), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS) characterization elucidated the successful fabrication of AuNPs-ZnO-rGO nanocomposites. Voltammetry investigation demonstrated the excellent electrocatalytic activity of AuNPs-ZnO-rGO nanocomposites toward the redox reaction of 6-gingerol. Using the best experimental conditions (pH: 2.0 BR; the amount of AuNPs-ZnO-rGO suspension: 6 μL; accumulation time: 120 s), the linearity of the peak currents relied on the concentration of 6-gingerol from 0.1 to 100 μM with a detection limit of 0.03 μM (S/N = 3). The developed approach was successfully implemented for the quantification of 6-gingerol in ginger samples, with recoveries of 99.07‒102.1%.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Fangmin Wu,Jun Nan,Tianzuo Wang,Zhencheng Ge,Bohan Liu,Meng Chen,Xuesong Ye
The activity and selectivity of the cathode towards electrosynthesis of H 2 O 2 are critical for electro-Fenton process. Herein, nickel-foam modified with N, O co-doped graphite nanosheets (NO-GNSs/Ni-F) was developed as a cathode for highly efficient and selective electrosynthesis of H 2 O 2 . Expectedly, the accumulation of H 2 O 2 at pH= 3 reached 494.2 mg L −1 h −1 , with the selectivity toward H 2 O 2 generation reaching 93.0%. The synergistic effect of different oxygen-containing functional groups and N species on the performance and selectivity of H 2 O 2 electrosynthesis was investigated by density functional theory calculations, and the combination of epoxy and graphitic N (EP + N) was identified as the most favorable configuration with the lowest theoretical overpotential for H 2 O 2 generation. Moreover, NO-GNSs/Ni-F was applied in the electro-Fenton process for p-nitrophenol degradation, resulting in 100% removal within 15 min with the kinetic rate constant of 0.446 min −1 and 97.6% mineralization within 6 h. The efficient removal was mainly attributed to the generation of bulk ·OH. Furthermore, NO-GNSs/Ni-F exhibited excellent stability. This work provides a workable option for the enhancement of H 2 O 2 accumulation and the efficient degradation of pollutants in electro-Fenton system.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 10
·e53566
·
IF 3
Yuxia Zhang,Qinglin Li,Jiawen Chen,Yanyan Zheng,Xiaoyu Lu,Qinhui Chen
Dual physical network hydrogel possesses robust energy dissipation mechanism. However, the demanding conditions of the second monomer radical polymerization aren't benefit for the dispersion of conductive filler. Moreover, the stable and sensitive response under extreme environment puts forward the requirements for mechanical, antifreezing and moisture retention properties. Herein, a dual physical networks hydrogel (polyacrylic acid-chitosan-graphene/glycerol, noted as PAA-CS-G/Gly) was prepared rapidly (<0.5 h) without chemical cross-linking agents at room temperature. The rapid gelation, ionic coordination of Ag + together with certain viscosity chitosan promoted the dispersion of graphene. PAA-CS-G/Gly showed ultra-stretchable properties (~2500%), good toughness (3.11 MJ/m 3 ), breaking strength (0.27 MPa) and fatigue resistance. PAA-CS-G/Gly had good adhesion properties, outstanding tolerance for freezing (−80°C) and moisture retention. More importantly, PAA-CS-G/Gly strain sensor had excellent sensitivity (GF, up to 9.449) at 300% ~ 900% strain. It could sensitively detect human joint movements and even subtle activities such as talking and swallowing. PAA-CS-G/Gly hydrogel is expected to adhere directly to the human body for flexible monitoring of human size movement under extreme environmental conditions.
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DESALINATION
·
2023
·
IF 9.9
Xue Chang,PeiZhuo Hu,Huiling Liu,Zixiao Lv,Jingyi Yang,Jianli Wang,Zhan Li,Lijuan Qian,Wangsuo Wu
Due to the popularization of nuclear energy and the application of nuclear technology , there is an increasing demand for uranium resources. Extraction of uranium from seawater has become a hot topic. To achieve uranium capture, a three-dimensional carbon structure material (GO/ZIF-8@SA) with ionic stress elastic expansion consisting of graphene oxide, ZIF-8 and sodium alginate was developed. Surface morphological characteristics and elemental composition evaluation were determined by using SEM. The doping concentration of the elements in the synthesized products was measured by EDS. XRD, FT-IR and XPS confirmed the successful doping of ZIF-8. In seawater spiked with uranium, GO/ZIF-8@SA showed not only an ultra-high adsorption capacity of 1897 mg·g −1 for U(VI), but also a high selectivity . Interestingly, the volume of GO/ZIF-8@SA can be elastically expanded with the adsorption of U(VI). The expanded microspheres can be directly captured from the seawater by the mesh sieve. GO/ZIF-8@SA solves the problem of balancing adsorption capacity and selectivity in a complex seawater environment, which gives it great potential for application in seawater uranium extraction.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yalin Yang,Xiulan Weng,Zuliang Chen
Recycling rare earth elements (REEs) from sources of secondary waste such as REEs mine wastewater has emerged as a sustainable approach with both waste reuse and wastewater processing. In this study, green reduced graphene oxide (G-rGO) was prepared utilizing green tea extract with the advantages of being environmentally friendly, sustainable, and low cost. To understand how G-rGO functions, it was compared to commercial reduced graphene oxide (rGO), and the efficiencies in adsorbing Y(III) were 91.6% and 11.9%, respectively. This indicated there is a synergistic adsorption between the capping layer of G-rGO and rGO alone. G-rGO and rGO were characterized before and after exposure to Y(III). This comparison indicated that Y(III) was adsorbed on the surface of G-rGO through complexation and electrostatic interaction. The adsorption kinetics best fit the pseudo-second-order model and the Langmuir model isotherm model, with adsorption capacities of 24.54 mg g −1 . A probable adsorption mechanism of Y(III) by G-rGO was proposed, involving electronic complexation, electrostatic adsorption and ion exchange. Furthermore, the adsorption efficiencies of G-rGO for Y(III), Ce(III) and Zn(II) in mine wastewater were 22.1%, 89.1% and 14.6%, respectively. These results demonstrate that G-rGO has great potential in the recovery of REEs from mine wastewater.
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高影响因子
Nanoscale
·
2023
·Vol. 15
·期 8
·4063-4070
·
IF 6.7
Mengjiao Li,Qingjie Yu,Meie Zheng,Rongrong Jiang,Hongda Zhu,Huiling Guo,Hongmei Sun,Mingxing Liu
A label-free electrochemical immunosensor for high-sensitive detection of β-amyloid 1–42 (Aβ 1–42) was constructed based on Au-modified B, S, and N co-doped reduced graphene oxide (Au-BSN-rGO). The electronic structure of Au-BSN-rGO was investigated by first-principles calculations, which showed that the band gap of graphene was opened, thus improving its electrical conductivity. Moreover, Au-BSN-rGO was successfully prepared and characterized, and the obtained results discovered that it could be used as a signal amplifier for immunosensors due to the advantages of the good electrochemical characteristics and enormous surface area of BSN-rGO and the accelerated electron transfer ability of Au NPs. Furthermore, the label-free electrochemical immunosensor had a linear detection range of 0.1 pg mL−1–10 ng mL−1 and a detection limit of 0.072 pg mL−1, and it had good specificity, stability, and reproducibility. Also, this immunosensor showed recoveries of 89%–109% with an RSD of 2.61%–4.19% for detecting Aβ 1–42 in actual sample analysis. Therefore, the label-free electrochemical immunosensor based on Au-BSN-rGO should have a promising clinical application prospect for detecting Aβ 1–42.
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Nanomaterials
·
2023
·Vol. 13
·期 2
·365
·
IF 5.3
Wenkai Li,Zhiyong Xie,Shi Qiu,Haodong Zeng,Minqi Liu,Gangsheng Wu
Composite bipolar plates with excellent performance play a crucial role in improving the overall performance of proton-exchange-membrane fuel cells. However, for graphite/resin composite bipolar plates, their electrical conductivity and mechanical properties are often too complex to meet the needs of users at the same time. Although nanoconductive fillers can alleviate this problem, the performance improvement for composite bipolar plates is often limited due to problems such as agglomeration. In this study, a uniformly dispersed multi-walled carbon nanotube network was prepared by in situ vapor deposition on the surface and pores of expanded graphite, which effectively avoided the problem of agglomeration and effectively improved the various properties of the composite BPs through the synergistic effect with graphite. With the addition of 2% in situ deposited carbon nanotubes, the modified composite bipolar plate has the best conductivity (334.53 S/cm) and flexural strength (50.24 MPa), and all the properties can meet the DOE requirements in 2025. Using the in situ deposition of carbon nanotubes to modify composite bipolar plates is a feasible route because it can result in multi-walled carbon nanotubes in large quantities and avoid the agglomeration phenomenon caused by adding nanofillers. It can also significantly improve the performance of composite bipolar plates, achieving the high performance of composite bipolar plates at a lower cost.Keywords:multi-walled carbon nanotubes;composite bipolar plates;PEMFC;MWCNTs networks;chemical vapor deposit;conductivity
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高影响因子
Materials
·
2023
·Vol. 16
·期 2
·684
·
IF 3.4
Yunxin Yang,Cong Wang,Hua Zhang,Jiancai Qian,Song Yang,Huiyun Liao,Xuehui Sun,Yipeng Wang,Peijian Sun,Yunzhen Jia,Junwei Guo,Huaiyuan Zhu,Cong Nie
Removal of 1,3-butadiene from cigarette smoke plays an important role in human health and environmental protection. Herein, a series of UiO-66 X% containing different ratios of the -NH2group was synthesized via the solvothermal method by using terephthalic acid (H2BDC) and 2-aminoterephthalic acid (NH2-BDC) as ligands. Using GO as support, a series of UiO-66-NH2/GO Y% were prepared by controlling the ratio of UiO-66-NH2and GO. The effects of -NH2and GO contents on the structure and composition of MOFs were investigated. Finally, the different -NH2contents of UiO-66 X% and the different GO contents of UiO-66-NH2/GO Y% were applied in 1,3-butadiene removal from cigarette smoke. The results showed that UiO-66 X% with the higher contents of -NH2showed a higher rate of 1,3-butadiene removal, and UiO-66-NH2/GO Y% with the GO contents of 5% showed the highest removal rate of about 33.85%, which was 25.54% higher than that of activated carbon. In addition, the saturation capacity of the adsorbent materials for 1,3-butadiene was as high as 210.01–239.54 mg/g, showing great potential in reducing harmful components in cigarette smoke and environmental protection.Keywords:UiO-66;UiO-66-NH2/GO;1,3-butadiene removal;cigarette smoke
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