JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 4
·2444-2453
·
IF 1.938
Wang Jinhua,Yang Shuai,Chang Jingming,Pang Shishi,Fu Hongquan,Jiang Feng,Liao Yunwen,Gao Hejun
The effects of hydrothermal temperature on the photocatalytic degradation performance of bismuth oxide formate were investigated using Bi(NO 3 ) 3 ·5H 2 O and N , N -dimethylformamide prepared by a simple hydrothermal process. Its structure and properties were analyzed by field emission scanning electron microscope, Fourier transform infrared spectroscopy, x-ray powder diffraction, and ultraviolet and visible absorption spectra. The photocatalytic degradation performance was evaluated in tetracycline solutions. Temperature has a great influence on the morphology of BiOCOOH, and reduces the width of the energy gap. The photocatalytic degradation rate of BiOCOOH prepared at 160°C (BiO-160) with regard to tetracycline was 3.2 times that at 140°C. Within 70 min, BiO-160 can almost completely degrade 10 mg/L of tetracycline in aqueous solution. Photocatalytic mechanisms showed that ·OH plays a major role, while ·O 2 − plays a secondary role in the photocatalytic degradation of tetracycline by BiO-160.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 12
·3299-3313
·
IF 4.157
Wang Milan,Song Zhihua,Jiang Youwei,Zhang Xiaolin,Wang Lin,Zhao Hongyu,Cui Yutong,Gu Furong,Wang Yunhua,Zheng Guoxia
Here, we present the rational design of a pinwheel-shaped three-dimensional microfluidic paper-based analytical device (3D-μPAD) for specific, sensitive and multiplexed detection of heavy metals in coastal waters. A more homogeneous permeation of fluids along the chip than common design, even under unskilled performance, has been achieved by the elaborate chip design of the hydrostatic balancing inlet port and uniformly stressed reversible sealing. With the combination of ion imprinted polymer grafted CdTe quantum-dots and fluid accumulation pad, 4 metals (Cu 2+ , Cd 2+ , Pb 2+ , and Hg 2+ ) in 1 analysis and 25-fold enrichment for each metal can be simultaneously performed within 20 min, with detection limits of 0.007–0.015 μg/L. It has the ability to selectively recognize these 4 metals in mixtures and immunizing to interferences from components found in coastal waters, which provided results that were in agreement with values gained from atomic absorption. The inexpensive and portable nature as well as the highly sensitive and flexible performance of the new developed 3D-μPAD could make it attractive as an on-site testing approach for marine environmental monitoring. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 29
·39199-39209
·
IF 4.223
Peng Yecan,Ye Guirong,Du Yangliu,Zeng Lingyu,Hao Jiawen,Wang Shuangfei,Zhou Jinghong
This study focused on the feasibility of using Fe 3 O 4 /graphene oxide (FGO) nanocomposites as heterogeneous catalysts for the advanced treatment of real industrial wastewater. FGO nanocomposites with different graphene oxide (GO) ratios were synthesized by coprecipitating iron salts onto GO sheets in basic solution. The characterization of the resulting material structures and functionalities was performed using a range of analytical techniques. A low GO loading afforded a good Fe 3 O 4 nanoparticle dispersibility and resulted in a higher Brunauer–Emmett–Teller surface area and pore volume. The FGO nanocomposites and pure Fe 3 O 4 were used to treat papermaking wastewater in a heterogeneous photo-Fenton process. The results suggested that the nanocomposite designated FGO1 (GO loading of 25 mg) exhibits a higher photocatalytic efficiency than other FGO nanocomposites and pure Fe 3 O 4 . A maximum chemical oxygen demand degradation efficiency of 89.6% was achieved in 80 min with 1.5 g L −1 FGO1 at pH 3. The degradation of different pollutants present in wastewater was evaluated with the aid of gas chromatography–mass spectrometry and 3D excitation–emission-matrix analysis. Inductively coupled plasma atomic emission spectroscopy and magnetic measurements confirmed that the FGO1 nanocomposites possess a low iron leachability and a high reusability. Thus, a comprehensive advanced treatment of real industrial wastewater using a magnetic FGO catalyst is demonstrated.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 6
·3078-3083
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IF 1.938
Wu Wanyi,Wang Mengkun,Huang Huihui,Gu Wenxian,Yan Chengzhan,Chen Guang,Yin Dewu,Jin Huile,Wang Jichang,Wang Shun
In this work, hierarchically porous carbon spheres co-doped by iron and nitrogen were synthesized via in situ dehalogenation. The rich porous structure and relatively high specific surface area (210 m 2 /g) facilitate the formation of an ultra-fine Fe 2 N active phase and FeN 4 active centers within the carbon matrix. Transmission electron microscopy and X-ray photoelectron spectroscopy analysis further reveal the presence of a dominant Fe 2 N phase and minor FeN 4 bonds in the as-prepared Fe-N-C-pd-800 samples. Because of this, the oxygen reduction reaction (ORR) process can more readily take place on Fe 2 N than on FeN 4 , and the Fe 2 N phase enriched Fe-N-C-pd-800 carbon spheres exhibit a promising onset potential ( E onset =1.02 V) and half-wave potential ( E 1/2 =0.86 V) in alkaline media. In addition, Fe-N-C-pd-800 also shows excellent methanol resistance and long-cycling stability.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 2
·286-292
·
IF 1.307
Hu Tao,Yang Weiwei,Wang Cheng,Bu Yali,Jin Feng,Zhang Dongwen,Gu Min,Liu Wenhui,Liang Qinghua,Liu Ruiqing,Feng Xiaomiao,Ma Yanwen
Sodiumion batteries(SIBs) have attracted intensive attention as promising alternative to lithium-ionbatteries(LIBs) for large scale energy storage systems because of low cost of sodium, similar energy storage mechanism and the reasonable performance. However, it is still a great challenge to search and design a robust structure of anode materials with excellent cycling stability and high rate capability for SIBs. Herein, multilayer porous vanadium nitride (VN) microsheets are synthesized through a facile and scalable hydrothermal synthesis-nitrogenization strategy as an effective anode material for SIBs. The multilayer porous VN microsheets not only offer more active sites for fast Na + insertion/extraction process and short diffusion pathway, but also effectively buffer the volume change of anode due to more space in the multilayer porous structure. The large proportions of capacitive behavior imply that the Na + charge storage depends on the intercalation pseudocapacitive mechanism. The multilayer porous VN microsheets electrodes manifest excellent cycling stability and rate capability, delivering a discharge capacity of 156.1 mA·h/g at 200 mA/g after 100 cycles, and a discharge capacity of 111.9 mA·h/g at 1.0 A/g even after 2300 cycles with the Coulombic efficiency of nearly 100%.
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CELLULOSE
·
2021
·Vol. 28
·期 7
·4039-4051
·
IF 5.044
Yang Jirui,Wang Xiaoqi,Shen Feng,Qi Xinhua
Pretreatment is a necessary process in biorefineries to overcome recalcitrance of biomass and enhance its conversion efficiency for further transformation. NaOH activation of Na 2 S 2 O 8 , which merges alkaline pretreatment and advanced oxidation processes (AOPs) into one process, was performed at room temperature (25 °C) within a short duration (60 min). High concentration of NaOH plays a critically important role in NaOH–Na 2 S 2 O 8 pretreatment, which not only selectively removed hemicellulose in the lignocellulosic feedstock, but also activated Na 2 S 2 O 8 to produce strong oxidative radicals, leading to disruption of lignin matrix. The surface area and porosity for the pretreated feedstock were significantly increased compared with those of the pristine counterpart. After pretreatment by 5.12 M NaOH and 0.85 M Na 2 S 2 O 8 , the maximum glucose yield of the feedstock was increased by 47.4% compared with that of pristine counterpart (60.3% vs. 40.9%). This study provides an effective and easily-realizable pretreatment method for the utilization of lignocellulosic biomass. Graphic abstract
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Food Analytical Methods
·
2021
·Vol. 14
·期 7
·1345-1358
·
IF 3.366
Wei Yihua,Zhang Jinyan,Qiu Shuyan,Huang Qingqing,Yuan Linfeng,Chen Liumeng,Dai Tingcan,Tu Tianhua,Zhang Biaojin,Yan Han,Li Weihong
A simple, rapid, and accurate method for determination of selenocystine (SeCys 2 ), methyl selenocysteine (MeSeCys), selenourea (SeUr), selenite (Se(IV)), selenotmethionine (SeMet), and selenate (Se(VI)) in grain crops was developed, based on the coupling of ion-pair reversed-phase high-performance liquid chromatography (IP-RP-HPLC) and ultraviolet irradiation hydride generation atomic fluorescence spectrometry (UV-HG-AFS). The conditions of IP-RP-HPLC-UV-HG -AFS were studied. The conditions of the pretreatment sample, such as types and dosage of proteinases, were investigated. The detection limits (LODs) for six Se species were between 0.77 and 1.77 μg·L −1 . Then, the proposed method has been successfully used to analyze selenium (Se) species in Se-enriched rice paddy ( Oryza sativa L. ), soybean ( Glycine max (Linn.) Merr. ), and sweet potato ( Ipomoea batatas (L.) Lam. ) with foliar application of sodium selenite solution. SeMet was the major Se spices in Se-enriched grain crops, ranged from 77–90% of the total Se contents. The capabilities of Se enrichment were relatively larger differences in three-grain corps as follows: soybean > rice paddy > sweet potato.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-19
·
IF 10.435
Li Yuzhan,Liang Luxin,Li Wu,Ashraf Umair,Ma Lin,Tang Xiangru,Pan Shenggang,Tian Hua,Mo Zhaowen
Background Cadmium (Cd) is amongst the most toxic heavy metals that severely affects crop growth, whereas application of nanoparticles (NPs) to negate the toxic effects of heavy metals could be an effective management approach. In the present study, the seeds of two fragrant rice varieties i.e., Yuxiangyouzhan and Xiangyaxiangzhan under normal and Cd stress conditions i.e., 0 and 100 mg L− 1 applied with four levels of ZnO NPs i.e., 0, 25, 50, and 100 mg L− 1.Results Seed priming with ZnO NPs had no significant effect on the seed germination (p > 0.05) however, it substantially improved the seedling growth and other related physiological attributes under the Cd stress. The mean fresh weight of the shoot, and whole seedling was increased by 16.92–27.88% and by 16.92–27.88% after ZnO NPs application. The root fresh weight, root-shoot length was also substantially improved under ZnO NPs treatment. Moreover, application of ZnO NPs induced modulations in physiological and biochemical attributes e.g., the superoxide dismutase (SOD) activity in root and shoot, the peroxidase (POD) activity and metallothionein contents in root were increased under low levels of ZnO NPs. The α-amylase and total amylase activity were improved by ZnO NPs application under Cd Stress. Besides, modulation in Zn concentration and ZnO NPs uptake in the seedling were detected. The metabolomic analysis indicated that various pathways such as alanine, aspartate and glutamate metabolism, phenylpropanoid biosynthesis, and taurine and hypotaurine metabolism were possibly important for rice response to ZnO NPs and Cd.Conclusion Overall, application of ZnO NPs substantially improved the early growth and related physio-biochemical attributes in rice. Our findings provide new insights regarding the effects of ZnO NPs on seed germination, and early growth of rice, and its potential applications in developing crop resilience against Cd contaminated soils.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 29
·期 10
·3252-3262
·
IF 3.667
Aljohny Bassam Oud,Almaliki Abdullah Abdulaziz Ali,Anwar Yasir,Ul-Islam Mazhar,Kamal Tahseen
In this research work, a green method of using Saussurea costus extract for the synthesis of silver nanoparticles (AgNPs) is developed. Analysis of the synthesized AgNPs showed that the hydroxyl and carbonyl functionalities of the Saussurea costus extract are playing major roles in their synthesis. X-ray diffraction revealed that the AgNP has face-centered cubic crystal structure. Field emission scanning electron microscopy suggested that the AgNP nanoparticles has a spherical shape with sizes ranging ~ 45 ± 15 nm. Furthermore, these green synthesized AgNPs were applied in the catalysis as well as biomedical fields. AgNPs were embedded in a crosslinked thin polyvinyl alcohol sheet and repeatedly used in the 4-nitrophenol (4-NP) reduction for 8 times. A high activity was observed for the Saussurea costus extract synthesized AgNP (S.C./AgNP) where the rate constant was 0.441 min − 1 . The antibacterial studies on Escherichia coli , and Acinetobacter baumannii (gram negative) and Staphylococcus aureus and Methicillin-resistant Staphylococcus aureus (MRSA) (gram positive) bacterial strains showed a good potential of the S.C./AgNP in killing these pathogens at a concentration of 1 µg/ml.
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Advanced Fiber Materials
·
2021
·Vol. 3
·期 2
·138-146
·
IF 0
Li Chen,Ren Lipei,Zhang Chunhua,Xu Weilin,Liu Xin
Polypropylene (PP) membrane has been widely used in water purification and other fields owing to special pore structure, excellent mechanical properties and resistance to acids, alkalis and organic solvents. However, it is difficult for PP to introduce the hydrophilic chemical compositions for oil–water separation. Herein, superhydrophilic and underwater superoleophobic PP membranes were prepared by ALD for efficient gravity-driven oil–water separation. Owing to synergistic effect, oil contact angle of TiO 2 coated PP membrane under water can reach above 150°. Hence, TiO 2 coated PP membrane has great oil-repelling performance. Because of the superwetting property, TiO 2 coated PP membrane can easily separate oil–water mixture and have high separation efficiency (more than 95%). The outstanding recyclability and mechanical stability of TiO 2 coated PP membrane suggest the promising potential application in practical oil–water separation.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 29
·期 8
·2676-2685
·
IF 3.667
Haq Fazal,Yu Haojie,Wang Yang,Wang Li,Mehmood Sahid,Haroon Muhammad,Bilal-Ul-Amin,Fahad Shah,Uddin Md. Alim,Shen Di
Succinylated starches (SS) were prepared by the reaction of normal starch (NS) and porous starch (PS) with succinic anhydride (SA) in the presence of DMF solvent and base pyridine, respectively. The proton nuclear magnetic resonance and Fourier transform infrared were used to confirm the successful synthesis of the SS (SS1, SS2, SS3 and SS4, respectively). The X-ray diffractometer XPert PRO (Cu Kα, λ = 1.54 Å) was used to study the crystallinity of NS, PS and SS. The XRD analysis showed that the SS exhibited amorphous nature after succinylation. Thermogravimetric analysis and differential thermal analysis of NS, PS and SS showed that succinylation decreased the thermal stability. The morphology of the NS, PS and SS was studied by SEM. These SS were used as adsorbents for phenol removal. The adsorption efficiencies for phenol by NS, SS1, SS2, SS3 and SS4 were found to be 0.084 g/g, 0.165 g/g, 0.173 g/g, 0.183 g/g and 0.189 g/g, respectively.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 22
·28024-28037
·
IF 4.223
Lv Yuancai,Yu Jianying,Huang Siyi,Zheng Kaiyun,Yang Guifang,Liu Yifan,Lin Chunxiang,Ye Xiaoxia,Liu Minghua
Considering the high environmental risk, the remediation of antibiotic pollutants attracted numerous attentions. In this work, a novel photocatalyst, Ce 0.9 Zr 0.1 O 2 /SnIn 4 S 8 , was fabricated by in situ precipitation and hydrothermal method and then applied to the degradation of norfloxacin under the irritation of visible light. The SEM, TEM, XRD, XPS, and electrochemical results clearly showed that the n-type heterojunction between Ce 0.9 Zr 0.1 O 2 and SnIn 4 S 8 was successfully constructed, which greatly reduces the recombination of the photogenic electron and holes, leading to the improvement of photocatalytic performance and stability (recycled over eight times). Besides, the Ce 0.9 Zr 0.1 O 2 /SnIn 4 S 8 composite also exhibited good ability to mineralize norfloxacin. Under the optimal condition (pH 3, 1 g L −1 of 10% Ce 0.9 Zr 0.1 O 2 /SnIn 4 S 8 , and 8 mg L −1 of initial norfloxacin concentration), norfloxacin could be fully and rapidly degraded in 60 min, and completely mineralized in 4 h (99.3 ± 1.7%). LC-QTOF-MS results evidently displayed eight intermediates during norfloxacin degradation. In addition, with the attack of the reactive oxygen species (h + , •OH, and •O 2 − ), norfloxacin could be effectively decomposed via deoxygenation, hydroxylation, and carboxylation reactions. Notably, compared to photodegradation, the photocatalytic process could completely eliminate the norfloxacin from water because it could avoid the accumulation of toxic byproducts.
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