Enhanced selective removal of Pb(II) by modification low-cost bio-sorbent: Experiment and theoretical calculations

2021 ◽  
pp. 128372
Author(s):  
Chao Xiong ◽  
Can Xue ◽  
Liyun Huang ◽  
Peng Hu ◽  
Ping Fan ◽  
...  
Keyword(s):  
Theoretical Calculations ◽  
Low Cost ◽  
Selective Removal

Selective Removal of Nitrosamines from a Model Amine Carbon-Capture Waterwash Using Low-Cost Activated-Carbon Sorbents

2017 ◽  
Vol 51 (18) ◽  
pp. 10913-10922 ◽  
Author(s):  
Leland R. Widger ◽  
Megan Combs ◽  
Amit R. Lohe ◽  
Cameron A. Lippert ◽  
Jesse G. Thompson ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Capture ◽  
Low Cost ◽  
Selective Removal ◽  
Carbon Sorbents

scholarly journals MANUFACTURE OF A DIE PROTOTYPE FOR DIDACTIC PURPOSES IN MECHATRONIC ENGINEERING

2020 ◽  
pp. 1-40
Author(s):  
ELIEL EDUARDO MONTIJO-VALENZUELA ◽  
SAUL DANIEL DURAN-JIMENEZ ◽  
LUIS ALBERTO ALTAMIRANO-RÍOS ◽  
JOSÉ ISAEL PÉREZ-GÓMEZ ◽  
OSCAR SALMÓN-AROCHI
Keyword(s):  
Mechanical Design ◽  
Theoretical Calculations ◽  
Low Cost ◽  
Die Design ◽  
Element Analysis ◽  
Technological Institute ◽  
Computer Aided ◽  
Cad Models ◽  
Functional Prototype ◽  
Definition Of

The objective of this research is to manufacture a prototype of a teaching die for the specialty of precision mechanical design in mechatronic engineering, in order to achieve the skills required in unit two, regarding dies. The methodology used consists of five stages: 1. Definition of the preliminary conditions. 2. Theoretical calculations for die design. 3. Design, modeling and assembly using computer-aided software (CAD) of the parts that make up the die. 4. Validation with simulation of finite element analysis (AEF). 5. Manufacture of parts and physical assembly of the die. A functional prototype was obtained with which the teacher and student can perform calculations, designs and CAD models, AEF analysis of the static and fatigue type, manufacture of rapid prototypes using 3D printing, the identification of the parts that make up a die and their functioning. The advantage of this prototype, compared to metal die-cutting machines, is its low cost of production and manufacturing, it does not require expensive and specialized machinery for manufacturing, specific designs can be made by the students and its subsequent manufacture within the laboratories of the Technological Institute of Hermosillo.

Polysaccharide-derived hydrogel water filter for the rapid and selective removal of arsenic

2019 ◽  
Vol 5 (7) ◽  
pp. 1318-1327 ◽  
Author(s):  
Santu Maity ◽  
Nabanita Naskar ◽  
Susanta Lahiri ◽  
Jhuma Ganguly
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Liquid Extraction ◽  
Selective Removal ◽  
Water Filter ◽  
Solid Liquid Extraction ◽  
Removal Of Arsenic ◽  
Solid Liquid

A low-cost furfuraldehyde–chitosan cross-linked hydrogel (FCH) has been designed and synthesized as a smart bio-adsorbent for the selective removal of As(v) from an aqueous solution using a solid liquid extraction (SLX) technique.

scholarly journals A Natural Polymer Captor for Immobilizing Polysulfide/Polyselenide in Working Li–SeS2 Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yin Zhang ◽  
Menglei Wang ◽  
Yi Guo ◽  
Lingzhi Huang ◽  
Boya Wang ◽  
...  
Keyword(s):  
Theoretical Calculations ◽  
Low Cost ◽  
Specific Capacity ◽  
Three Dimensional ◽  
Rate Capability ◽  
Lewis Base ◽  
Organic Polymer ◽  
Binding Interaction ◽  
Attenuation Rate ◽  
Design Protocol

AbstractSeS2 has become a promising cathode material owing to its enhanced electrical conductivity over sulfur and higher theoretical specific capacity than selenium; however, the working Li–SeS2 batteries have to face the practical challenges from the severe shuttling of soluble dual intermediates of polysulfide and polyselenide, especially in high-SeS2-loading cathodes. Herein, a natural organic polymer, Nicandra physaloides pectin (NPP), is proposed to serve as an effective polysulfide/polyselenide captor to address the shuttling issues. Informed by theoretical calculations, NPP is competent to provide a Lewis base-based strong binding interaction with polysulfides/polyselenides via forming lithium bonds, and it can be homogeneously deposited onto a three-dimensional double-carbon conductive scaffold to finally constitute a polysulfide/polyselenide-immobilizing interlayer. Operando spectroscopy analysis validates the enhanced polysulfide/polyselenide trapping and high conversion efficiency on the constructed interlayer, hence bestowing the Li–SeS2 cells with ultrahigh rate capability (448 mAh g−1 at 10 A g−1), durable cycling lifespan (≈ 0.037% capacity attenuation rate per cycle), and high areal capacity (> 6.5 mAh cm−2) at high SeS2 loading of 15.4 mg cm−2. Importantly, pouch cells assembled with this interlayer exhibit excellent flexibility, decent rate capability with relatively low electrolyte-to-capacity ratio, and stable cycling life even under a low electrolyte condition, promising a low-cost, viable design protocol toward practical Li–SeS2 batteries.

scholarly journals DEVELOPMENT AND JUSTIFICATION OF THE STRUCTURE OF ASSEMBLIES OF PYROLYSIS INSTALLATION FOR UTILIZATION OF MEDICAL WASTE

2021 ◽  
pp. 59-67
Author(s):  
Rostyslav Iskovich-Lototskyy ◽  
Nataliia Veselovska ◽  
Oleksii Tokarchuk ◽  
Oleksandr Skliaruk
Keyword(s):  
Minimum Degree ◽  
Theoretical Calculations ◽  
Low Cost ◽  
Evaluation Criteria ◽  
Environmental Safety ◽  
Operational Reliability ◽  
Medical Waste ◽  
Operating Conditions ◽  
Operational Parameters ◽  
Hazardous Chemical

When developing a pyrolysis plant for the disposal of medical waste, the evaluation criteria were ergonomics, operational reliability, simplicity and manufacturability of its manufacture, as well as maintainability. In certain operating conditions, given the high degree of epidemiological danger, ensuring the minimum degree of operator contact with the most medical waste is an urgent task. Therefore, the most effective solution in the development of a simple and operationally reliable pyrolysis plant for waste disposal, provided the use of a special robotic loading device and a furnace design for incinerating medical waste. The application of the above developments made it possible to efficiently for the environment, in an automated mode, dispose of medical waste with a minimum degree of operator contact with the most medical waste, as well as with minimal economic and technological disposal costs. The creation of a simpler, highly reliable and safe pyrolysis plant for the disposal of medical waste with a low cost of their manufacture, increased maintainability and a high environmental safety degree necessitates special design and theoretical calculations. Plants for the disposal of medical waste are distinguished by a special nature of work, which is the excessive creation of high temperatures, for the complete neutralization (oxidation) of hazardous chemical compounds contained in medical waste. Therefore, when developing the pyrolysis plant itself for the disposal of medical waste, one should take into account the temperature difference at the inlet and outlet of the furnace itself for incinerating medical waste. In the process of developing and justifying the design of the units of the new installation for the disposal of medical waste, the following tasks were solved: - development of a schematic diagram of the units of the facility for the disposal of medical waste, reflects the relationship between the operating and operational parameters of the facility itself; - design calculations for the units of the facility for the disposal of medical waste; - theoretical studies of the influence of the operating and operational parameters of the installation for the disposal of medical waste in the technological process of disposal of medical waste.

scholarly journals Atomically dispersed Pb ionic sites in PbCdSe quantum dot gels enhance room-temperature NO2 sensing

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xin Geng ◽  
Shuwei Li ◽  
Lalani Mawella-Vithanage ◽  
Tao Ma ◽  
Mohamed Kilani ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Metal Ion ◽  
High Performance ◽  
Room Temperature ◽  
Limit Of Detection ◽  
Theoretical Calculations ◽  
Low Cost ◽  
High Sensitivity ◽  
Sensor Response ◽  
Response And Recovery

AbstractAtmospheric NO2 is of great concern due to its adverse effects on human health and the environment, motivating research on NO2 detection and remediation. Existing low-cost room-temperature NO2 sensors often suffer from low sensitivity at the ppb level or long recovery times, reflecting the trade-off between sensor response and recovery time. Here, we report an atomically dispersed metal ion strategy to address it. We discover that bimetallic PbCdSe quantum dot (QD) gels containing atomically dispersed Pb ionic sites achieve the optimal combination of strong sensor response and fast recovery, leading to a high-performance room-temperature p-type semiconductor NO2 sensor as characterized by a combination of ultra–low limit of detection, high sensitivity and stability, fast response and recovery. With the help of theoretical calculations, we reveal the high performance of the PbCdSe QD gel arises from the unique tuning effects of Pb ionic sites on NO2 binding at their neighboring Cd sites.

scholarly journals Application of the Metal Reflector for Redistributing the Focusing Intensity of SPPs

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 937
Author(s):  
Jiaxin Ji ◽  
Pengfei Xu ◽  
Zhongwen Lin ◽  
Jiying Chen ◽  
Jing Li ◽  
...  
Keyword(s):  
High Efficiency ◽  
Theoretical Calculations ◽  
Low Cost ◽  
Near Field ◽  
Focusing Effect ◽  
Photoresist Layer ◽  
Calculation Results ◽  
Energy Flux Density ◽  
Flux Density Distribution

The near-field photolithography system has attracted increasing attention in the micro- and nano-manufacturing field, due to the high efficiency, high resolution, and the low cost of the scheme. Nevertheless, the low quality of the nano-patterns significantly limits the industrial application of this technology. Theoretical calculations showed that the reason for the poor nano-patterns is the sharp attenuation of the surface plasmon polaritons (SPPs) in the photoresist layer. The calculation results suggest that the waveguide mode, which is composed of the chromium-equivalent dielectric layer-aluminum, can facilitate the energy flux density distribution in the photoresist layer, resulting in the enhancement of the field intensity of SPPs in the photoresist layer. This reduces the linewidth of nano-patterns, while it enhances the pattern steepness. Eventually, the focusing energy of the photoresist layer can be improved. The finite-difference time-domain method was employed to simulate and verify the theoretical results. It is found that for the rotational near-field photolithography with 355 nm laser illumination, the linewidths of the nano-patterns with and without the aluminum reflector are 17.54 nm and 65.51 nm, respectively. The robustness of the experimental results implies that the application of the aluminum reflector enhances the focusing effect in the photoresist, which can broaden the application of the near-field photolithography.

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