High-efficiency continuous enrichment of cesium ions using CuFC composite microspheres: dynamic adsorption and mechanism analysis

2020 ◽  
Vol 326 (2) ◽  
pp. 959-973
Author(s):  
Xi Chen ◽  
Ye Li ◽  
Lijun Zhu ◽  
Yi Ke ◽  
Xiaoli Wang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Dynamic Adsorption ◽  
Mechanism Analysis ◽  
Cesium Ions ◽  
Composite Microspheres ◽  
Continuous Enrichment

scholarly journals Enhancing Arsenic Solidification/Stabilisation Efficiency of Metallurgical Slag-Based Green Mining Fill and Its Structure Analysis

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1389
Author(s):  
Wei Gao ◽  
Zifu Li ◽  
Siqi Zhang ◽  
Yuying Zhang ◽  
Pingfeng Fu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Calcium Nitrate ◽  
Outer Sphere ◽  
High Specific Surface Area ◽  
Sodium Sulphate ◽  
Metallurgical Slag ◽  
Hydration Reaction ◽  
Mechanism Analysis ◽  
Low Carbon ◽  
Sphere Complex

To dispose of arsenic-containing tailings with low carbon and high efficiency, sodium sulphate (Na2SO4), sodium hydroxide (NaOH), calcium nitrate Ca(NO3)2 and calcium hydroxide Ca(OH)2 were independently added to metallurgical slag-based binder (MSB) solidification/stabilisation (S/S)-treated tailings (MSTs) to enhance the MST arsenic S/S performance. Results showed that only Ca(OH)2 could increase the unconfined compressive strength of MST from 16.3 to 20.49 MPa and decrease the leachate As concentration from 31 μg/L to below 10 μg/L. Na3AsO4·12H2O and NaAsO2 were used to prepare pure MSB paste for mechanism analysis. The results of microstructure analyses showed the high specific surface area and amorphous properties of calcium–sodium aluminosilicate hydrate facilitated the adsorption or solid-solution formation of As(V) and As(III). As(V) formed an inner-sphere complex in ettringite, whereas As(III) formed an outer-sphere complex, and the relatively larger size and charge of As(V) compared with SO42− restrict substitution inside channels without affecting the ettringite structure under high loading of As(V). The added Ca(OH)2 promoted the hydration reaction of MSBs and facilitated the formation of a Ca–As(V) precipitate with low solubility, from Ca4(OH)2(AsO4)2·4H2O (Ksp = 10−27.49) to Ca5(AsO4)3(OH) (Ksp = 10−40.12). This work is beneficial for the application of cement-free MSB in the S/S process.

scholarly journals Cyclodextrin modified filter paper for removal of cationic dyes/Cu ions from aqueous solutions

2018 ◽  
Vol 78 (12) ◽  
pp. 2553-2563 ◽  
Author(s):  
Yaoyue Li ◽  
Yanbo Zhou ◽  
Yi Zhou ◽  
Juying Lei ◽  
Shengyan Pu
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Filter Paper ◽  
Textile Industry ◽  
High Efficiency ◽  
National Standard ◽  
Esterification Reaction ◽  
Dynamic Adsorption ◽  
Pseudo Second Order ◽  
Cu Ions

Abstract A filter paper was functionalized with β-cyclodextrin and citric acid via esterification reaction for the removal of dyes and Cu ions from aqueous solutions. The adsorption capacity and removal performance of the modified filter paper (MFP) was investigated using static and dynamic adsorption experiments. The static adsorption data fit well the Langmuir and pseudo-second-order models, and the adsorption capacity of Methylene Blue (MB), Brilliant Green (BG), Rhodamine-B (RB) and Cu(II) over the MFP were 124.6 mg/g, 130.4 mg/g, 99.7 mg/g and 39.1 mg/g, respectively, which are much higher than the unmodified filter paper (below 2 mg/g). Even better, the decolorization performance and Cu(II) removal of MFP are remarkable in dynamic adsorption. The effluent can reach the National Standard for dyeing and finishing of textile industry of China after three cycles in a continuous filtration-adsorption system. This method provides a new pathway to achieve high efficiency removal of dyes and metal ions from wastewater.

Preparation and Mechanism Analysis of High-Efficiency early Strength Agent

2012 ◽  
Vol 535-537 ◽  
pp. 2483-2487 ◽  
Author(s):  
Ming Sheng Zhang
Keyword(s):  
Cement Hydration ◽  
High Efficiency ◽  
Calcium Nitrate ◽  
Xrd Analysis ◽  
Mechanism Analysis ◽  
Hydration Products ◽  
Mineral Formation ◽  
Early Strength ◽  
Further Development

High-efficiency early strength agents were obtained which included triethanolamine, glycol and calcium nitrate. Then it was tested for concrete. Though text, we find that the compressive strength and flexural strength of the specimen, use of the high-efficiency early strength agent is greatly improved than with its much better not to use high-efficiency early strength agent. With time go on, high-efficiency early strength agent added does not make the strength of concrete worse, but better. Using SEM and XRD analysis technology text high-efficiency early strength agent by adding performances of concrete, including the degree of cement hydration, the morphology of hydration products and the composition of mineral formation. Analysis of the role of high-efficiency early strength agents from the perspective of the mechanism. Identified high-efficiency early strength agent impact on the cement hydration, for the further development of early strength agent to provide a theoretical basis.

Surfactant-Assisted Solvothermal Synthesis and High Visible-Light-Induced Photocatalytic Activity of BiOBr Nanocomposite Photocatalyst

NANO ◽  
2016 ◽  
Vol 11 (01) ◽  
pp. 1650002 ◽  
Author(s):  
Jing Xu ◽  
Guogang Tang ◽  
Wei Liang ◽  
Dongyi Zhou ◽  
Changsheng Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Organic Contaminants ◽  
High Efficiency ◽  
Diffuse Reflectance Spectroscopy ◽  
One Pot ◽  
Photocatalytic Ability ◽  
Composite Microspheres ◽  
Surfactant Assisted

BiOCl/BiOBr composite microspheres were synthesized through a one-pot mixed surfactant-assisted solvothermal process. The morphology, crystal structure, surface area and photocatalytic activity of the as-prepared BiOCl/BiOBr composite were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-visible diffuse reflectance spectroscopy. The photocatalytic ability of the as-prepared photocatalysts was evaluated using rhodamine B (RhB) as a target pollutant. The BiOCl/BiOBr composite exhibited much higher photocurrent intensity than pure BiOBr, BiOCl and other different components, which perfectly coincided with the enhanced photocatalytic activity for the degradation of RhB under visible light ([Formula: see text][Formula: see text]nm). Moreover, this novel and facile strategy to fabricate bismuth halide-based composite with high efficiency were widely used in other bismuth-based composite photocatalyst for removing organic contaminants in wastewater.

Mechanism Analysis of High Efficiency Axial Turn-Grinding of Engineering Ceramics

2011 ◽  
Vol 487 ◽  
pp. 376-380 ◽  
Author(s):  
Xin Li Tian ◽  
Fang Guo ◽  
Ya Tao Mao ◽  
Bao Guo Zhang ◽  
Jian Quan Wang ◽  
...  
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Cutting Edge ◽  
Work Piece ◽  
Mechanism Analysis ◽  
Machined Surface ◽  
Effective Removal ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
A Minor

Axial turn-grinding is a method to cut the cylindrical work piece along its axis, using the kinetic energy of high-speed rotation annularity tool, the abrasives in tool tip as the main cutting edge to remove materials and the abrasives in the inside or outside surface of tool as a minor cutting edge to sharpen the processed surface. Through analysis the simplified model, a slightly stress concentration was found at the junction surface of processed surface and machined surface, which had little damage to the workpiece because of happening in the part to be removed or precision machining allowance, and both cracks propagation caused by material rupture were effective removal after material removal mechanism analysis because the extension of the median/radial crack and lateral crack were both happening in the part to be removed.

scholarly journals High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 947
Author(s):  
Anyu Li ◽  
Hua Deng ◽  
Yanhong Jiang ◽  
Chenghui Ye
Keyword(s):  
Hexavalent Chromium ◽  
Adsorption Mechanism ◽  
High Efficiency ◽  
Adsorption Process ◽  
Raw Materials ◽  
Mechanism Analysis ◽  
Adsorption Effect ◽  
Magnetic Biochar ◽  
Before And After ◽  
Kinetics Of

Biochars were produced with magnesium chloride as an additive for the sorption of hexavalent chromium dissolved in water using five types of straw (from taro, corn, cassava, Chinese fir, and banana) and one type of shell (Camellia oleifera) as the raw materials. The removal of hexavalent chromium by the six biochars mainly occurred within 60 min and then gradually stabilized. The kinetics of the adsorption process were second order, the Langmuir model was followed, and the adsorption of Cr(VI) by the six biochars was characterized by Langmuir monolayer chemisorption on a heterogeneous surface. Banana straw biochar (BSB) had the best performance, which perhaps benefitted from its special structure and best adsorption effect on Cr(VI), and the theoretical adsorption capacity was calculated as 125.00 mg/g. For the mechanism analysis, Mg-loaded biochars were characterized before and after adsorption by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and scanning electron microscopy/energy dispersive spectroscopy (SEM-EDS). The adsorption mechanism differed from the adsorption process of conventional magnetic biochar, and biochar interactions with Cr(VI) were controlled mainly by electrostatic attraction, complexation, and functional group bonding. In summary, the six Mg-loaded biochars exhibit great potential advantages in removing Cr(VI) from wastewater and have promising potential for practical use, especially BSB, which shows super-high adsorption performance.

Position and Orientation Analyses of Mechanism by PHCpack Solver of Homotopy Continuation

2012 ◽  
Vol 152-154 ◽  
pp. 1779-1784
Author(s):  
Hong Bing Xin ◽  
Qiang Huang ◽  
Yue Qing Yu
Keyword(s):  
High Efficiency ◽  
Graphical Method ◽  
Continuation Method ◽  
Sufficient Accuracy ◽  
Homotopy Continuation ◽  
Analytic Method ◽  
Mechanism Analysis ◽  
Homotopy Continuation Method ◽  
Analysis And Synthesis ◽  
Position And Orientation

Mechanism analysis and synthesis commonly used analytic method and graphical method, etc., but the homotopy method has high efficiency in nonlinear analysis of mechanism. This paper applies the homotopy continuation method PHCpack solver to solve mechanism position and orientation, and draws the mechanism configuration according to the results obtained, the relative error of numerical results to exact solutions shows that the homotopy continuation method PHCpack solver can provide sufficient accuracy of mechanism position and orientation analysis, and meet the engineering needs.

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