scholarly journals Wastewater Treatment from Lead and Strontium by Potassium Polytitanates: Kinetic Analysis and Adsorption Mechanism

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 217 ◽  
Author(s):  
Anna Ermolenko ◽  
Alexey Shevelev ◽  
Maria Vikulova ◽  
Tatyana Blagova ◽  
Sergey Altukhov ◽  
...  
Keyword(s):  
Kinetic Analysis ◽  
Sorption Capacity ◽  
Fluorescence Analysis ◽  
Ion Concentration ◽  
Metal Extraction ◽  
Molten Salt Synthesis ◽  
Order Model ◽  
Potassium Polytitanate ◽  
Developed Surface ◽  
Before And After

The reduction of heavy and radioactive metal pollution of industrial wastewater remains a vital challenge. Due to layered structure and developed surface, potassium polytitanate had potential in becoming an effective sorbent for metal extraction from wastewater in the presented paper. On the basis of the different sorption models, this paper studied the mechanism of Pb2+ and Sr2+ cation extraction from aqueous solution by non-crystalline potassium polytitanate produced by molten salt synthesis. The ion exchange during metal extraction from model solutions was proven by kinetic analysis of ion concentration change, electronic microscopy, and X-ray fluorescence analysis of sorbent before and after sorption, as well as by theoretical modeling of potassium, lead, and strontium polytitanates. The sorption was limited by the inner diffusion in the potassium polytitanate (PPT) interlayer space, as was shown using the Boyd diffusion model. The sorption processes can be described by Ho and McKay’s pseudo-second-order model compared to the Lagergren pseudo-first-order model according to kinetic analysis. It was found that the ultimate sorption capacity of synthesized sorbent reached about 714.3 and 344.8 (ions mg/sorbent grams) for Pb2+ and Sr2+ ions, respectively, which was up to four times higher than sorption capacity of the well-known analogues. Therefore, the presented study showed that potassium polytitanate can be considered as a promising product for industry-scaled wastewater purification in practice.

scholarly journals Kinetic Analysis of Mouse Brain Proteome Alterations Following Chikungunya Virus Infection before and after Appearance of Clinical Symptoms

PLoS ONE ◽  
2014 ◽  
Vol 9 (3) ◽  
pp. e91397 ◽  
Author(s):  
Christophe Fraisier ◽  
Penelope Koraka ◽  
Maya Belghazi ◽  
Mahfoud Bakli ◽  
Samuel Granjeaud ◽  
...  
Keyword(s):  
Virus Infection ◽  
Kinetic Analysis ◽  
Mouse Brain ◽  
Chikungunya Virus ◽  
Clinical Symptoms ◽  
Before And After ◽  
Brain Proteome

scholarly journals Effect of Reaction Temperature on Adsorption Efficiency using Computer Mathematical Statistics Visible Spectorphotometer

2021 ◽  
Vol 2083 (3) ◽  
pp. 032072
Author(s):  
Yongli Zhang ◽  
Ruiting Li
Keyword(s):  
Reaction Temperature ◽  
Metal Ion ◽  
Adsorption Rate ◽  
Ion Concentration ◽  
Adsorption Efficiency ◽  
Optimum Temperature ◽  
Absorption Effect ◽  
Before And After ◽  
Measurement Experiment ◽  
Optimal Reaction

Abstract In this paper, waste shrimp shells extracted from the head of the chitosan material; static adsorption experiments manner by wastewater containing Fe(III) added chitosan, vis spectrophotometer absorbance before and after the measurement experiment was obtained by reacting the size of the metal ion concentration, adsorption conditions whereby chitosan Fe(III) and the ability to explore. Experiments show that. In the case where the reaction temperature is less than 55°C, chitosan has adsorption rate Fe(III) smaller rise, the optimum temperature was 55°C, but the effects on the reaction temperature adsorption rate is not large; Adsorption when control time 30 min to 50 min, the absorption effect is increased with increase in the time, to reach the optimal reaction time 50 min.

scholarly journals Enhanced removal of hexavalent chromium by different acid-modified biochar derived from corn straw: behavior and mechanism

2020 ◽  
Vol 81 (10) ◽  
pp. 2270-2280
Author(s):  
Yonggang Xu ◽  
Tianxia Bai ◽  
Yubo Yan ◽  
Yunfeng Zhao ◽  
Ling Yuan ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Hydrogen Ion ◽  
Corn Straw ◽  
Order Model ◽  
Freundlich Model ◽  
X Ray ◽  
Modified Biochar ◽  
Before And After ◽  
Pseudo Second Order ◽  
Kinetics Of

Abstract It is of great significance to remove Cr(VI) from water as a result of its high toxicity. Biochar from corn straw was modified by different acids (HNO3, H2SO4 and H3PO4) to remove Cr(VI) from aqueous solution. To estimate the removal mechanisms of Cr(VI) by the acid-modified biochars, batch experiments were performed in the light of contact time, Cr(VI) concentration, and pH, and the characteristics of acid-modified biochars before and after Cr(VI) adsorption were investigated by Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics of Cr(VI) by acid-modified biochars were consistent with the pseudo-second-order model, and the adsorption isotherm obeyed the Freundlich model. Furthermore, the acid- modified biochars could supply more oxygen-containing functional groups (-COOH and -OH) as electron donor (e−) and hydrogen ion (H+) to enhance the reduction of Cr(VI) to Cr(III), resulting in enhanced removal of Cr(VI). HNO3-modified biochar exhibited the highest removal efficiency of Cr(VI). In general, the acid modifition of biochar was an effective method to increase the removal of Cr(VI).

scholarly journals Effect of Simulated Matches on Post-Exercise Biochemical Parameters in Women’s Indoor and Beach Handball

2020 ◽  
Vol 17 (14) ◽  
pp. 5046
Author(s):  
Joanna Kamińska ◽  
Tomasz Podgórski ◽  
Jakub Kryściak ◽  
Maciej Pawlak
Keyword(s):  
Blood Parameters ◽  
Ion Concentration ◽  
Electrolyte Balance ◽  
Acid Base Balance ◽  
Acid Base ◽  
Urine Ph ◽  
Physically Active ◽  
Post Exercise ◽  
Before And After ◽  
Base Balance

This study assesses the status of hydration and the acid-base balance in female handball players in the Polish Second League before and after simulated matches in both indoor (hall) and beach (outdoor) conditions. The values of biochemical indicators useful for describing water-electrolyte management, such as osmolality, hematocrit, aldosterone, sodium, potassium, calcium, chloride and magnesium, were determined in the players’ fingertip capillary blood. Furthermore, the blood parameters of the acid-base balance were analysed, including pH, standard base excess, lactate and bicarbonate ion concentration. Additionally, the pH and specific gravity of the players’ urine were determined. The level of significance was set at p < 0.05. It was found that both indoor and beach simulated matches caused post-exercise changes in the biochemical profiles of the players’ blood and urine in terms of water-electrolyte and acid-base balance. Interestingly, the location of a simulated match (indoors vs. beach) had a statistically significant effect on only two of the parameters measured post-exercise: concentration of calcium ions (lower indoors) and urine pH (lower on the beach). A single simulated game, regardless of its location, directly affected the acid-base balance and, to a smaller extent, the water-electrolyte balance, depending mostly on the time spent physically active during the match.

Kinetic analysis of graphitized-carbon reactions in Li-ion cells before and after cycling degradation

2018 ◽  
Vol 321 ◽  
pp. 98-105
Author(s):  
Omar Samuel Mendoza-Hernandez ◽  
Eiji Hosono ◽  
Daisuke Asakura ◽  
Hirofumi Matsuda ◽  
Yoshitsugu Sone ◽  
...  
Keyword(s):  
Kinetic Analysis ◽  
Graphitized Carbon ◽  
Before And After ◽  
Li Ion

scholarly journals The Effect of Temperature, Light and Calcium Carbonate on Seed Germination and Radicle Growth of the Polycarpic Perennial Galium cracoviense (Rubiaceae), a Narrow Endemic Species From Southern Poland

2015 ◽  
Vol 57 (1) ◽  
pp. 70-81 ◽  
Author(s):  
Jeremi Kołodziejek ◽  
Jacek Patykowski
Keyword(s):  
Calcium Carbonate ◽  
Endemic Species ◽  
Soil Surface ◽  
Ion Concentration ◽  
Effect Of Temperature ◽  
Radicle Growth ◽  
Southern Poland ◽  
Narrow Endemic ◽  
Before And After ◽  
Different Temperatures

Abstract Germination responses of Galium cracoviense Ehrend. (Rubiaceae), a narrow endemic species from southern Poland, were tested in light and dark conditions at three constant temperatures (5, 10, or 22°C), before and after cold-wet stratification. Additionally, seeds were germinated under different calcium carbonate (CaCO3) concentrations (1, 5, 10, 15, 20, or 25 mM/L CaCO3) at 22°C in light. The high germination capacity of seeds incubated at different temperatures, shortly after collection, already suggested the absence of dormancy in this species. Thus, the seeds are ready to germinate immediately in the field when water resources are available and the temperature is adequate. Light was a significant factor for G. cracoviense; more seeds germinated in light than in darkness at all temperatures tested. Cold stratification decreased germination especially at higher temperatures. The light requirement for G. cracoviense germination ensures their successful germination on or near the soil surface, and in cracks and crevices in limestone, when temperature and edaphic conditions are favourable. Seeds of this species show temperature enforced dormancy throughout the winter. Germination was significantly affected by calcium carbonate. Non-germinated seeds germinated well after being transferred from higher CaCO3 concentrations to distilled water. The results indicate that the seeds of this species can endure CaCO3 stress without losing their viability and start germination once CaCO3 concentration is reduced. It can be concluded that the seeds of this species require lower Ca2+ ion concentration, moderate temperatures and the presence of light to germinate.

Comparison of Kinetic Analysis for the Full Axial Rotation Before and After Arthroscopic Rotator Cuff Repair

2019 ◽  
Vol 2019 (0) ◽  
pp. C-31
Author(s):  
Takeshi SHIMOTO ◽  
Toshiyuki WATANABE ◽  
Kodai KUZUSHIMA ◽  
Hirotaka GONDO ◽  
Satoru IKEBE ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Kinetic Analysis ◽  
Rotator Cuff Repair ◽  
Axial Rotation ◽  
Arthroscopic Rotator Cuff Repair ◽  
Before And After ◽  
Arthroscopic Rotator Cuff ◽  
Cuff Repair

Molten Salt Synthesis and Characterization of Potassium Polytitanate Ceramic Precursors with Varied TiO2/K2O Molar Ratios

2008 ◽  
Vol 91 (9) ◽  
pp. 3058-3065 ◽  
Author(s):  
Tomas Sanchez-Monjaras ◽  
Alexander Gorokhovsky ◽  
Jose I Escalante-Garcia
Keyword(s):  
Molten Salt ◽  
Molten Salt Synthesis ◽  
Synthesis And Characterization ◽  
Molar Ratios ◽  
Potassium Polytitanate ◽  
Ceramic Precursors
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