Journal of Central South University
·
2018
·Vol. 25
·期 4
·709-718
·
IF 0.761
Tian Qing-hua,Wang Xiao-yang,Mao Fang-fang,Guo Xue-yi
The purpose of this study is to explore the adsorption performance of meso-2, 3-dimercaptosuccinic acid (DMSA) modified Fe3O4@SiO2 magnetic nanocomposite (Fe 3 O 4 @SiO 2 DMSA) for Pb 2+ ions removal from aqueous solutions. The effects of solution pH, initial concentration of Pb2+ions, contact time, and temperature on the amount of Pb2+ adsorbed were investigated. Adsorption isotherms, adsorption kinetics, and thermodynamic analysis were also studied. The results showed that the maximum adsorption capacity of the Fe 3 O 4 @SiO 2 DMSA composite is 50.5 mg/g at 298 K, which is higher than that of Fe3O4 and Fe 3 O 4 @SiO 2 magnetic nanoparticles. The adsorption process agreed well with Langmuir adsorption isotherm models and pseudo second-order kinetics. The thermodynamic analysis revealed that the adsorption was spontaneous, endothermic and energetically driven in nature.
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ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2024
·Vol. 196
·期 12
·1152
·
IF 2.9
Alamgir Aamir,Fatima Noor
In the present study, piped water samples from Gulshan-e-Iqbal Town, Karachi, were evaluated for their Health Risk Assessment (HRA) and Water Quality Index (WQI). For this, different physicochemical and microbiological parameters were analyzed, and the results were evaluated according to the guidelines established by the WHO (2011) and the National Standards for Drinking Water Quality (NSDWQ) (2008). With the exception of sulphate, all physicochemical parameters were well within the guideline values. The mean concentrations of the metals in the samples were in the following order: Ca 2+ > Mg 2+ > Zn > Fe > Pb > Ni > Cr > As. More than 70% of the samples tested for Total Coliform Count (TCC), Total Faecal Coliform Count (TFC), Total Feacal Streptococci (TFS), and Total Aerobic Count (TAC) were feacal contaminated. E. coli was also isolated in almost 84.61% of the tested piped water samples. Results from the WQI revealed that 95.6% of samples had good physico-chemical characteristics, and 26% of the piped water samples had good microbiological quality. The WQI readings of all the samples for metals showed that they were unfit for human consumption. The mean Chronic Daily Intake (CDI) and Hazard Quotient (HQ) values, respectively, were in the following order: Zn > Fe > Pb > Ni > Cr > As, and Pb > As > Ni > Cr > Zn > Fe. All HQ values for As and Pb were greater than 1, and 50% of piped water samples had an HQ value for Ni that was greater than 1, indicating that people may suffer serious health issues as a result. All of the piped water samples except the area of block 13 D (S-5), had HQ values of less than 1 in relation to iron, but Zn HQ values of less than 1 indicated only mild health problems. Discharge of untreated sewage and cross-contamination are all potential sources of contamination that could result in diseases that are harmful to the public’s health. Water monitoring and management projects should be implemented in order to improve pipeline infrastructure and reduce sewage leakages.
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Nano Research
·
2018
·Vol. 11
·期 4
·1967-1976
·
IF 7.994
Wang Xiandi,Ling Rui,Zhang Yufei,Que Miaoling,Peng Yiyao,Pan Caofeng
Mechanoluminescent materials that convert mechanical stimuli to light emission have attracted extensive attention for potential applications in human-machine interactions. Here, we report a simple and available novel approach for the oxygen-assisted preparation of ZnS:Mn particles by solid-state reaction at atmospheric pressure without the formation of the corresponding oxides. The existence of O 2 has a positive impact on the formation of S vacancies in wurtzite-phase ZnS, leading to the introduction of Mn 2+ ion luminescent centers and shallow donor levels, which can improve the electron-hole recombination rate. The O 2 ratio and Mn 2+ ion doping concentration have significant effects on the luminous efficiency, which is optimal at 1%–20% and 1 at.%–2 at.% respectively. In addition, a device based on the piezo-photonic effect with excellent pressure sensitivity of 0.032 MPa −1 was fabricated, which can map the two-dimensional pressure distribution ranging from 2.2 to 40.6 MPa in situ . This device can be applied to real-time pressure mapping, smart sensor networks, high-level security systems, human-machine interfaces, and artificial skins.
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Journal of Geographical Sciences
·
2024
·Vol. 34
·期 6
·1128-1156
·
IF 4.3
Zhao Shengbo,Qi Junheng,Li Dongxue,Wang Xingping
Railways are a crucial part of the African transport network and have a significant impact on the socio-economy and urban development. Previous studies have mainly considered the impacts of railways in Africa from the perspective of economy, politics, security, and natural environment with few attempts to consider land use. Based on Landsat remote sensing data for the 10 km buffer zone along the Ethiopian section of the Addis Ababa–Djibouti Railway (ADR) in 2013, 2017, and 2021, we studied the land use change (LUC) in the area and explored its influencing factors using the ordinary least square model (OLS) and geographical weighted regression model (GWR). There were six key results. (1) Farmland, forest, grassland, and others (including sandy land and bare land) were the primary types of land use, but from 2013 to 2021, the area of built-up land and farmland increased, whereas the area of forest, grassland, and other land decreased. (2) There was a noticeable pattern in the degree of change in the area of built-up land, farmland, and forest as the buffer distance increased along the railway. This pattern indicated a gradual shift in land use and LUC gradients. (3) The land use structure and its changes in the areas surrounding different stations displayed obvious differences. (4) The construction and operation of the ADR is one of the direct factors affecting landscape change along the railway. (5) The distance from the train station, whether the station provides a passenger service, the population size, and the distance from the central city had a positive effect on the expansion of built-up land surrounding the station. The factor of whether the station provides a freight service had a negative correlation with the expansion of built-up land. Socio-economic factors have gradually replaced railway factors as the main driving force of the expansion of built-up land around the stations. (6) The effect strength of different factors on the expansion of built-up land varied in the areas surrounding different stations.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 8
·6088-6097
·
IF 3.442
Luo Bin,Zhang Xiong,Xie Tian,Zhou Yanping,Huang Kama
Microwave heating has been widely used to enhance the fabricating rate of nanomaterials in the past few decades. However, the application of interaction between microwave and chemical reaction in tuning nanomaterials morphology is yet to be explored, while strategies to manipulate material nanostructures are of great importance for enhanced function. In this work, we demonstrate the potential of microwave in tuning the morphology of nanostructured NiCo DHs by accurate temperature control through the precise design of microwave reacting system. We find that 200-W microwave irradiation gives yield to unique flower-on-sheet hierarchical structure of NiCo DHs, while microspheres are derived from oil-bath heating. Microwave power is found to play a vital role in the tuning process. When microwave power decreases to 50 W, assembled nanoflakes are obtained; when microwave power increases to 300 W, microspheres are obtained. Further, fluid permittivity is monitored and field intensity in the reacting region is simulated and found to increase with time. Taken together, it is proposed that field-induced de-solvation possibly exists and is the main tuning mechanism. When tested as electrode materials in supercapacitor, products obtained from 200 W microwave treatment show enhanced storage capacities, especially at high current density.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 28
·22450-22457
·
IF 2.741
Deng Chao,Li Ying,Li Jinhui,Chen Yuan,Li Huafen
Though mechanical recycling of WEEE plastics is supposed to be a promising method, PBDEs release and the resulting contamination during its processing remain unclear yet. The distribution of PBDEs pollution in production lines was investigated from two flame-retardant plastic modification plants in Southern China. This was followed by laboratory simulation experiments to characterize the emission processes. PBDEs concentrations ranged from 37 to 31,305 ng/L in cooling water and from 40,043 to 216,653 ng/g dry wt in solid samples taken during the field investigation. In the laboratory simulation, concentrations ranged from 146 to 433 ng/L in cooling water and from 411,436 to 747,516 ng/Nm 3 in flue gas. All samples were dominated by BDE-209 among the congeners. Temperatures and impurities in plastic substrate can significantly affect PBDEs release. Special attention should be paid to the risks of water directly discharge from the cooling system, especially for the biological sludge and sediments, as well as flue gas emissions to the environment.
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Journal of Electrical Engineering & Technology
·
2019
·Vol. 14
·期 1
·355-361
·
IF 0.715
Lu Shibin,Wang Haibo,Meng Ying,Wang Feifei,Fan Min,Chen Junning
Introduction Chemical mechanical polishing is the only one technology to obtain global planarization, which is widely applied to polish silicon, copper dual damascene structure, high/low K dielectric materials, tungsten plugs, poly-silicon gates and shallow trench isolation structure. SiO2 is widely used as abrasive for its superior properties like stability, suspension property and low viscosity There are lots of studies on silica properties. However, the detailed silica surface, inner characteristic and its effect on polishing performance are still unclear. we must also explore the silica nano-particle tiny structure difference, so we designed an experiment that we anneal the colloid silica and re-dispersed it to analyze the variety of particles properties and its influences on CMP performance. Materials The water glass was purchased from the market. KOH (90%) and H2SO4 (98%) were purchased commercially from Shanghai Aladdin Bio-Chem technology Co., Ltd. All reagents were of analytical grade and used without further purification. Method Diluted KOH or H2SO4 were added to 1 wt% annealed silica slurry to adjust pH value to 11.0. The slurry was milled in the polishing process. Arsenic doped 4 inch (100) silicon wafer was used to polish. The structural and morphological evolution of silica nano-particles induced by heat treatment are studied by scanning electron microscopy (SEM), X-Ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), differential thermal (DTA) and thermal gravimetric analysis (TGA), which disclose the external and internal structure.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2016
·Vol. 20
·期 1
·247-254
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IF 1.853
Pei Liujun,Wu Ping,Liu Juanjuan,Wang Jiping
Reverse micro-emulsion dyeing technology shows a high dye uptake and fixation rate, and effectively decreases the amount of waste water in the textile industry. However, the influence of surfactants and co-surfactants on micro-emulsifying water in reverse micro-emulsions has not been investigated. In this study, the micro-emulsifying mechanism in silicone media and the influence of nonionic surfactants and co-surfactants on micro-emulsifying water have been investigated. The results show that a large amount of water can be emulsified using alcohol-polyoxyethylene ethers, especially under 3–5 ethylene oxide groups in molecular structure. As co-surfactant, alcohol which contains 4–9 carbon chains could spontaneously form reverse micro-emulsions in silicone media. The effects of solution pH and ionic strength on the amount of emulsified water were also evaluated. The results show that a large amount of water could be emulsified in silicone media at solution pH 2–9. Meanwhile, the amount of emulsified water decreased with increasing ionic strength. Thus, the optimum conditions for water emulsification are low ionic strength and pH between 2 and 9.
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Science China-Materials
·
2021
·Vol. 64
·期 9
·2313-2324
·
IF 8.273
Gao Yang,Wang Yuanrui,Xia Shan,Gao Guanghui
Ionic hydrogel-based sensors have shined a spotlight on wearable electronics. However, the sensitivity and reliability of hydrogel devices are significantly hampered by the weak adhesion of skin-sensor interface as well as inferior temperature tolerance. Here, inspired by the structure and composition of dermis, a novel skin-attachable and environment-stable hydrogel was designed by integrating collagen into the LiCl-containing chemically cross-linked polyacrylamide hydrogel. The hydrogel exhibited skin-like mechanical properties of low modulus, superior stretchability as well as excellent elasticity. Furthermore, the introduction of collagen endowed the hydrogel with robust and seamless interfaces with diverse materials, including the curved skin. As a result, the hydrogel is capable of serving as a human-machine interface for collecting reliable electrocardiography (ECG) signals and discerning various human motions, with high sensitivity (gauge factor = 10.7), fast response, negligible hysteresis as well as extensive monitoring range. Notably, the hydrogel that can mimick the temperature-tolerant mechanism of most organisms possesses persistent stabilization of adhesive, conductive, sensory and mechanical performances at subzero or ambient conditions. The skin-inspired strategy paves an effective way for the design of multifunctional materials with potential applications in next-generation electronics.
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Scientific Reports
·
2023
·Vol. 13
·期 1
·14507
·
IF 4.6
Zhou Yao,Chen Dengkai,Xiao Jianghao,Wang Hanyu
Improving the human reliability of the human–machine interface (HMI) of deep-sea manned submersible is of great importance for the development of the deep-sea field. Based on the SHEL (Software S, Hardware H, Environment E, Liveware L) model, this study classifies the performance shaping factors (PSF) that affect the human reliability of submersible HMIs and builds a PSF system. The interpretative structural model (ISM) is used to matrix the interactions between the elements that make up the system of PSF. A multi-level recursive structure is obtained by building the corresponding adjacency matrix. The Noisy-OR model is introduced to construct a Bayesian network in order to build a new HMI evaluation method. A real case of Bayesian network causal inference verifies the validity of the built method. This study proposes a set of HMI human reliability evaluation methods applicable to deep-sea manned submersible, which provides a new idea for human reliability assessment.
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International Journal of Minerals Metallurgy and Materials
·
2026
·Vol. 33
·期 8
·2700-2713
·
IF 8.8
Yang Xueqing,Chen Zhibin,Ding Xiaolun,Jia Dongfang,Du Shiyao,Chowwanonthapunya Thee,Wu Dequan,Zhou Kun,Wang Jinke,Ma Lingwei,Zhang Dawei
This study addresses the corrosion and scaling issues of metallic materials in high-salinity environments. Three commonly used scale inhibitors and corrosion inhibitors—polyaspartic acid (PASP), polyepoxysuccinic acid (PESA), and hydroxyethylidene diphosphonic acid (HEDP)—were selected for multi-component formulations. High-throughput screening methods were employed to efficiently identify the optimal component ratios with the best synergistic effects for both scale and corrosion inhibition. The optimal ratios of ternary components of PASP: PESA: HEDP were found to be 1:1:2 and 2:1:1. The corrosion inhibition performance of the selected multi-component inhibitors was then systematically assessed using electrochemical impedance spectroscopy (EIS), and the results showed that the inhibition efficiency at the optimal concentration reached 89.1%. Additionally, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were used to characterize the corrosion and scaling surfaces of the treated Q235 steel, as well as the crystal structure of the generated CaCO 3 precipitates. Further investigation of the mechanisms underlying both scale and corrosion inhibition enabled the development of a rapid and precise approach for assessing the performance of formulated inhibitor systems.
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PHARMACEUTICAL CHEMISTRY JOURNAL
·
2026
·Vol. 59
·期 12
·1400-1409
·
IF 0.8
Khalid Ramsha,Hilles Ayah R,Mawazi Saeid Mezail,Sofian Zarif Mohamed,Widodo Riyanto Teguh,Chik Zamri Bin,Hashim Najihah Binti Mohd,Mahmood Syed
The current study was aimed at developing a simple, sensitive, and rapid reverse-phase high-performance liquid chromatographic (HPLC) method for the quantification of felodipine and its lipid-based pharmaceutical formulations, e.g., liposomes. The drug sample (felodipine) was eluted isocratically using a mobile phase of 0.01 N phosphate buffer solution and acetonitrile at a ratio of 20:80 (v/v) on a Phenomenex C-18 (150 mm × 4.68 mm) analytical column. At a UV wavelength of 234 nm, the drug was quantitatively determined using a standard calibration curve spanning the range of 2–50 μg/mL. The results showed that the limits of quantitation and detection were 0.09 and 0.03 μg/mL respectively. For both the intra-day and inter-day analysis, relative standard deviation was found to be less than 2%, and the drug’s percentage accuracy was found to be within an acceptable range. As per the established protocols, the developed method was quantitatively assessed for its intended use in terms of specificity, linearity, accuracy, precision, robustness, and sensitivity analysis. Felodipine-loaded liposomes, which are lipid-based membrane-like cell structures, were effectively used to determine the drug entrapment efficiency using the currently validated RP-HPLC method.
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