JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 2
·1-12
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IF 2.8
Li Fei,Zhao Qian,Jia Rong,Hu Te,Lu Yun,Hao Liang
ZnO films immobilized on SUS316L wire mesh are prepared by a conventional low-temperature hydrothermal method. To improve their photocatalytic activity, we decorate the films with Ag nanospheres using the impregnating photoreduction treatment. The prepared films are characterized using a series of advanced analytical methods. The SEM and EDS results show that continuous films consisting of ZnO nanorods shaped as six-prism cones are formed in the hydrothermal process. Ag 0 nanospheres with the dimension from a few to several hundred nanometers decorate the ZnO nanorods. Compared to the individual ZnO film, Ag–ZnO heterojunction improves the absorption of UV and visible light, decreases the bandgap value, and shifts the band position toward more positive potentials. It also inhibits the recombination of photo-inspired electrons and holes, thereby improving the photodegradation ability. The photocatalytic performance of Ag–ZnO composite films increases at most 5.6-fold compared to the bare ZnO film. Active holes (h + ), superoxide ( \(\bullet {\text{O}}_{2}^{ - }\) ), and hydroxyl ( \(\bullet {\text{OH}}\) ) species play significant roles in organic dye RhB photodegradation under simulated sunlight irradiation.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Junjie Fu,Afei Zhang,Dongxing Kou,Zewen Xiao,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
One important issue limiting the development of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells is the severe recombination loss at CZTSSe/Mo(S,Se) 2 /Mo back contact, primarily arising from the non-matched potential barrier and inferior electric contact between absorber and weak n -type Mo(S,Se) 2 interfacial layer. It is expected that a p-type Mo(S,Se) 2 can effectively improve the hole extraction and enhance the device performance. In this work, we propose a plausible direction to build up an electrically benign back surface field by in-situ doping Mo(S,Se) 2 with group VB elements (TM = V, Nb and Ta). It is turned out that the generated V Mo , Nb Mo , or Ta Mo shallow acceptors could convert Mo(S,Se) 2 from weak n -type to p-type conductivity and increase its work function ( W F ) and hole concentration. With the contact of p-type absorber ( W F,absorber < W F,Mo(S,Se)₂ ), a benign ohmic contact with favorable downward band bending is formed, thereby accelerating the holes extraction and minimizing interface recombination loss. With significant gains in open-circuit voltage ( V oc ) and fill factor (FF), the Mo(S,Se) 2 :Ta device finally increases the efficiency from 10.82 % to 12.72 %. This convenient in-situ Mo(S,Se) 2 doping strategy is different from previous complicated or unstable cases and should serve as a basis for high-quality back contact engineering in kesterite photovoltaics.
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TALANTA
·
2022
·
IF 6.556
Qiu-Shun Li,Yan Yang,Yong-Dong Du,Lei Cai,Yao-Hong Ma,Jun-Hui Yang,Mingyu Li,Qing-Jun Meng,Qing-Ai Liu,Wen-Fei Dong
Long period fiber gratings (LPFGs) have special advantages in the detection of salt concentrations due to small volume, corrosion resistance and immunity to electromagnetic interference. However, it is very difficult to distinguish low-concentration salt solutions with usual LPFGs owing to the poor sensitivity. In this paper, the detection capability of the LPFG to low-concentration salt solutions was significantly improved by assembling salt-containing poly (diallyldimethylammonium chloride) (PDDA) and salt-containing poly (sodium- p -styrenesulfonate) (PSS). Experimental results showed that, the responsive wavelength range of the LPFG was remarkably broadened in low-concentration salt solutions after assembling nanofilms . The suitable detection range of the PDDA/PSS films coated LPFG for salt concentrations was 0–3%. In such a range, the average refractive index sensitivity and the average salinity sensitivity of the LPFG was as high as 29545.9 nm/RIU and 52.2 nm/% respectively. Compared with the LPFG without nanofilms, the discrimination ability of the PDDA/PSS films coated LPFG to 0–3% salt solutions increased by 568 times. The analysis demonstrated that PDDA and salt in the assembly solutions played a pivotal role in the above effects. The proposed sensor has extensive application prospects in the monitoring of salt concentration in many fields such as seawater , food processing, fermentation process , etc.
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ACS Omega
·
2022
·
IF 4.132
Xiaolu Xiong,Chengwang Guo,Gengyang Yan,Bingxin Han,Zan Wu,Yueqian Chen,Shiqi Xu,Peng Shao,Hong Song,Xiyan Xu,Junfeng Han
Water quality guarantee in remote areas necessitates the development of portable, sensitive, fast, cost-effective, and easy-to-use water quality detection methods. The current work reports on a microfluidic paper-based analytical device (μPAD) integrated with a smartphone app for the simultaneous detection of cross-type water quality parameters including pH, Cu(II), Ni(II), Fe(III), and nitrite. The shapes, baking time, amount, and ratios of reaction reagent mixtures of wax μPAD were optimized to improve the color uniformity and intensity effectively. An easy-to-use smartphone app was established for recording, analyzing, and directly reading the colorimetric signals and target concentrations on μPAD. The results showed that under the optimum conditions, the current analytical platform has reached the detection limits of 0.4, 1.9, 2.9, and 1.1 ppm for nitrite, Cu(II), Ni(II), and Fe(III), respectively, and the liner ranges are 2.3–90 ppm (nitrite), 3.8–400 ppm (Cu(II)), 2.9–1000 ppm (Ni(II)), 2.8–500 ppm (Fe(III)), and 5–9 (pH). The proposed portable smartphone-app integrated μPAD detection system was successfully applied to real industrial wastewater and river water quality monitoring. The proposed method has great potential for field water quality detection.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2023
·
IF 4.1
Yixuan Fan,Runze Yu,Geoffrey I.N. Waterhouse,Ruiqiang Wang,Yufeng Sun,Zhixiang Xu
BACKGROUND Biogenic amines (BAs) in high concentrations are toxic and may cause a series of health symptoms. A sensitive measurement of BA levels is essential for human health. Capillary electrophoresis (CE) has emerged for the separation of eight BAs due to simple sample preparation and highly efficient separation. However, an important drawback for CE is low sensitivity. Magnetic solid-phase extraction (MSPE) has become a technique of interest owing to its brief operation and low solvent consumption. Hence, MSPE as a pretreatment has great potential to improve CE sensitivity for the analysis of BAs in complex food. RESULTS Results showed that the Pt-Co-MWCNTs-COOH possessed strong magnetism, good reusability, and high adsorptive ability toward eight biogenic amines based on the hydrogen bonding between the −COOH of Pt-Co-MWCNTs-COOH and −NH 2 groups of BAs. Using it as an adsorbent, a magnetic solid-phase extraction coupled with capillary electrophoresis (MSPE-CE) method was developed to effectively extract and sensitively analyze eight BAs. Under optimal conditions, the MSPE-CE method has wide linearities (10.0–1000.0 μg L −1 ) and low limits of detection (1.0–6.1 μg L −1 ). The accuracy of the developed method yielded recovery values from 82.07% to 102.58%. Meanwhile, the BAs contents in two samples were analyzed using the MSPE-CE method, with the results consistent with those detected by a high-performance liquid chromatography method. CONCLUSION Given those advantages, the established MSPE-CE method promises the practical guidance of monitoring a variety of BAs and provides a foundation for the detection of other food hazards. © 2023 Society of Chemical Industry.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Jing Gao,Zhi-Qing Wang,Zhe-Fan Wang,Biao Li,Zhe-Yu Liu,Jie-Jie Huang,Yi-Tian Fang,Cheng-Meng Chen
The electrochemical properties of corn starch (CS)-based hydrothermal carbon microsphere (CMS) electrode materials for supercapacitor are closely related to their structures. Herein, cetyltrimethyl ammonium bromide (CTAB) was used as a soft template to form the corn starch (CS)-based carbon microspheres with radial hollow structure in the inner and middle layers by hydrothermal and sol-gel method. Due to the introduction of multi-layer hollow structure of carbon microsphere, more micropores were produced during CO 2 activation, which increased the specific surface area and improved the capacitance performance. Compared to commercial activated carbon, the four different morphologies of corn starch CMS had better electrochemical performances. Consequently, the proposed CO 2 –(CTAB)-CS-CS exhibits a high discharge specific capacitance of 242.5F/g at 1 A/g in three-electrode system with 6 M KOH electrolyte, better than commercial activated carbon with 208.5F/g. Moreover, excellent stability is achieved for CO 2 –(CTAB)-CS-CS with approximately 97.14 % retention of the initial specific capacitance value after 10,000 cycles at a current density of 2 A/g, while the commercial activated carbon has 86.96 % retention. This implies that the corn starch-based multilayer hollow CMS could be a promising electrode material for high-performance supercapacitors.
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Advanced Science
·
2023
·
IF 15.1
Huiwen Xiong,Chenxin Zhu,Changhao Dai,Xin Ye,Yuanyuan Li,Pintao Li,Shuang Yang,Ghazala Ashraf,Dacheng Wei,Hui Chen,Huali Shen,Jilie Kong,Xueen Fang
Early diagnosis of acute diseases is restricted by the sensitivity and complex process of sample treatment. Here, an ultrasensitive, rapid, and portable electrochemiluminescence-microfluidic (ECL-M) system is described via sandwich-type immunoassay and surface plasmonic resonance (SPR) assay. Using a sandwich immunoreaction approach, the ECL-M system employs cardiac troponin-I antigen (cTnI) as a detection model with a Ru@SiO 2 NPs labeled antibody as the signal probe. For miR-499-5p detection, gold nanoparticles generate SPR effects to enhance Ru(bpy) 3 2+ ECL signals. The system based on alternating current (AC) electroosmotic flow achieves an LOD of 2 fg mL −1 for cTnI in 5 min and 10 aM for miRNAs in 10 min at room temperature. The point-of-care testing (POCT) device demonstrated 100% sensitivity and 98% specificity for cTnI detection in 123 clinical serum samples. For miR-499-5p, it exhibited 100% sensitivity and 97% specificity in 55 clinical serum samples. Continuous monitoring of these biomarkers in rats' saliva, urine, and interstitial fluid samples for 48 hours revealed observations rarely documented in biotic fluids. The ECL-M POCT device stands as a top-performing system for ECL analysis, offering immense potential for ultrasensitive, rapid, highly accurate, and facile detection and monitoring of acute diseases in POC settings.
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Journal of Cleaner Production
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2023
·
IF 11.1
Guorong Hu,Kun Huang,Ke Du,Zhongdong Peng,Yanbing Cao
The recovery and regeneration of FePO 4 from lithium extraction slag (LES) are crucial steps in the closed-loop recycling of waste LiFePO 4 batteries . This necessity arises despite the low commercial value of LES, as conventional recovery methods are cost-prohibitive, leading to insufficient attention to LES recovery. The recent surge in retired batteries has resulted in a significant accumulation of LES, posing serious environmental concerns, however, the high content of Fe and P resources in LES presents a potential value. The study begins with a theoretical analysis, concluding that the reduction leaching of LES is a feasible approach. By integrating this with the Fe powder synthesis route for FePO 4 , it is found that efficient leaching of LES can be achieved using a low concentration of H 2 SO 4 , thereby significantly reducing the recovery cost. This method not only efficiently utilize LES but also alleviates environmental pressure. The thermodynamic analysis sheds light on the mechanism of LES leaching and FePO 4 synthesis, confirming the feasibility of each reaction. Optimal leaching conditions (1.4 times the stoichiometric amount of H 2 SO 4 , 1.5 times the amount of Fe powder, an L/S ratio of 5 mL/g, and a reaction duration of 150 min at 60 °C), under which the leaching rates of Fe and P reached 94.66% and 98.23%, respectively. Additionally, the study introduces a method to remove the main impurity Al in LES, achieving a removal rate of over 99%, reducing its concentration to below 100 ppm. Other impurities, such as Ti, Mn, and Zn, also meet the Chinese Chemical Industry Standard (HG/T 4701-2021). Comparative analyses were conducted between regenerated R-FePO 4 , commercial C–FePO 4 , and untreated LES (r-FePO 4 ). LiFePO 4 materials derived from these sources were synthesized, followed by an evaluation of their electrochemical performance. The regenerated R-FePO 4 matched the quality of commercial FePO 4 and significantly outperformed r-FePO 4 . Additionally, the process proposed in this study yields significant economic benefits, estimating a profit of 719.6 $/t of recycled LES. This research proposes a cost-effective and efficient method for regenerating high-quality battery-grade FePO 4 from LES, offering a significant contribution to the closed-loop recycling of waste LiFePO 4 batteries.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Jianglin Liu,Linjun Wu,Dalang Chen,Quanzhou Xu,Liheng Chen,Xuliang Lin,Yanlin Qin
The electrocatalytic hydrogen production technology using green energy can reduce the dependence on traditional fossil fuels and the net emission of carbon dioxide. However, the high overpotential and low efficiency of the oxygen evolution reaction (OER) on the anode limit the overall water splitting. Here, carboxylic acid ligands with coordination function were designed and synthesized by modifying the surface functional groups of lignin. Bimetallic functionally-doped lignin-derived carbon materials (Fe 4 Ni 4 @NC) were synthesized by continuous ion layer adsorption and pyrolysis process using Fe and Ni transition metals as source and template. The catalyst requires only 214 mV of overpotential to produce 10 mA·cm −2 , which has much faster catalytic kinetics. Theoretical calculation shows that the energy barrier of rate-determining step in OER is reduced by appropriate feed ratio and nano-size. The facile strategy opens up an economical and efficient solution for designing OER electrocatalysts with high catalytic activity and excellent stability.
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MOLECULES
·
2023
·Vol. 28
·期 24
·7965
·
IF 4.6
Tongtong Xu,Xudong Zheng,Ang Li,Biao Ji
In this paper, an ammonia–urea system was developed to induce the shedding of carboxymethylcellulose carbon aerogels to form defects, and the specific surface area of the aerogels was significantly increased after carbonization, and the three-dimensional disordered pore structure of cellulose was preserved. The material showed the selective adsorption of gadolinium ions using the carboxylate active sites provided by carboxymethylation and the microporous or mesoporous structures formed after carbon burning. The successful synthesis of the material was demonstrated by relevant characterization, and the results of static adsorption experiments showed that the material was more consistent with the quasi second-order kinetic model at pH = 5.0. The maximum adsorption capacity was 99.65 mg g−1. The material showed a high adsorption capacity for gadolinium ions in the presence of competing ions and maintained 84.07% of the adsorption performance after five adsorption cycles. The simple use of urea ensured that the cellulose maintained its pore structure, and the specific surface area was greatly increased after carbonization, which provided a feasible direction for the industrial adsorption and recycling of rare-earth elements for reuse.Keywords:carbon aerogel;rare-earth elements;adsorption;recovery;gadolinium
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MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Shuo Huang,Qi Li,Haopeng Zhang,Xin Gao,Hang Su,Hongyan Yue
Molybdenum polydopamine hollow nanospheres were synthesized by liquid-phase reactions at room temperature and they were transformed into molybdenum carbide (Mo 2 C) when annealed at 800℃. Subsequently, they were self-assembled with graphene oxide (GO) and sprayed onto the indium tin oxide (ITO) glass. After heating at 400℃, the Mo 2 C - reduced GO/ITO (Mo 2 C - rGO/ITO) electrode was obtained and used for the detection of dopamine (DA). The results show that Mo 2 C is made up of dandelion-like hollow nanospheres with an outer and inner diameter of 500 and 200 nm, and Mo 2 C is homogeneously mixed with rGO nanosheets. Due to the synergistic effect of the excellet electrocatalytic properties of Mo 2 C and electrical conductivity of rGO, the hybrid Mo 2 C - rGO/ITO electrode shows a high sensitivity (8.30 μA·μM −1 ·cm −2 ) and a low limit of detection (LOD) (0.058 μM, S/N = 3) for DA in the range of 0–60 μM. Additionally, the electrode shows a good repeatability and stability, and it is also successfully used for the determination of DA in diluted human urine. It has a great potential for clinical applications.
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Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Yueling Yu,Jia Yang,Baogang Zhao,Xinfei Fan,Yuanlu Xu,Yanming Liu
Nonradical-based peroxymonosulfate (PMS) activation has recently caught increasing attention due to its less susceptible to environmental interference in the complex water matrix, but the performance of activators still requires further development for efficient pollutants degradation in wastewater treatment . Herein, a novel Co-Ni bimetal oxide loaded biochar was fabricated to boost nonradical PMS activation for enhancing sulfamethoxazole (SMX) degradation. According to the results, the as-obtained catalyst exhibited excellent SMX degradation efficiency of 96.2% within 30 min through complete nonradical oxidation pathway (including both 1 O 2 and mediated electron transfer). Co was confirmed to be the active sites to generate 1 O 2 dominated nonradical pathway. The biochar acted as the porous material to achieve the electron transfer oxidation process, as well as Ni ensured sufficient electron transfer rate and bound Co active sites to prevent the leaching of metal ions . Meanwhile, the prepared Co-Ni bimetal oxide loaded biochar possessed a remarkable catalytic degradation durability in the complex water environment conditions and showed universality for various organic contaminants . This study offers a valuable clue on the rational design of novel catalyst to induce the nonradical pathway-based persulfate activation .
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