Enhanced adsorption of Cr(vi) on BiOBr under alkaline conditions: interlayer anion exchange

2019 ◽  
Vol 6 (12) ◽  
pp. 3601-3610 ◽  
Author(s):  
Lixia Jia ◽  
Wei Zhou ◽  
Xiang Huang ◽  
Yizhong Zhang ◽  
Qiangying Zhang ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Adsorption Mechanism ◽  
Alkaline Solutions ◽  
Alkaline Conditions ◽  
Interlayer Anion ◽  
Enhanced Adsorption ◽  
First Time

The first time to explore the adsorption of Cr(vi) on BiOBr in alkaline solutions, and propose an original adsorption mechanism.

scholarly journals A Study of Catechin Photostability Using Photolytic Processing

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 293
Author(s):  
Jeu-Ming P. Yuann ◽  
Shwu-Yuan Lee ◽  
Meei-Ju Yang ◽  
Shiuh-Tsuen Huang ◽  
Chien-Wei Cheng ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Alkaline Solutions ◽  
Light Illumination ◽  
Drug Resistant ◽  
Alkaline Ph ◽  
Radical Species ◽  
Alkaline Conditions ◽  
Photolytic Reaction

Catechin exhibits numerous physiological characteristics. In this study, we determined the photosensitivity of catechin to various lights under alkaline conditions, and the mechanisms by which catechin generates free radical species and polymerizes via a photoreaction. In addition to this, the application of catechin photolysis was investigated. A solution of catechin is transparent, but turns yellowish under blue light illumination (BLI) in neutral or weak alkaline solutions. When catechin is subjected to BLI, a dimeric catechin (proanthocyanidin) and a superoxide anion radical (O2•−) are generated in a photolytic reaction. When ascorbic acid or gallic acid is added to catechin and the mixture is subjected to BLI at alkaline pH, fewer catechin dimers and less O2•− are produced, because both acids inhibit the photosensitive oxidation of catechin. When AlCl3 is added to catechin and the mixture is subjected to BLI at pH 8, a photolytic reaction is suppressed by AlCl3, and AlCl3 acts as a catalyst for the disconnection of proanthocyanidin during photolysis. Under alkaline conditions, catechin generates O2•− via photosensitive oxidation, which suppresses the growth of Acinetobacter baumannii (A. baumannii) by at least 4 logs, and deactivates its multi-drug-resistant strain. This study shows that catechin photolysis is a process of oxidation, and that it can be safely applied as a tool for environmental applications.

Metal–organic cage-based nanoagent for enhanced photodynamic antitumor therapy

2021 ◽  
Author(s):  
Yu-Bin Dong ◽  
Wen-Yan Li ◽  
Chaowei Zhao ◽  
Yue-Feng Zhang ◽  
Qun Guan ◽  
...  
Keyword(s):  
Solid State ◽  
Indocyanine Green ◽  
Anion Exchange ◽  
Near Infrared ◽  
Antitumor Therapy ◽  
Metal Organic ◽  
First Time

Herein we report, for the first time, a Pd6L8(NO3)5.4(ICG)6.6 (ICG = indocyanine green) cage-based hexagonal nanoplate (3) via a combined nanoprecipitation and solid-state anion-exchange approach. 3 possesses near infrared (NIR)...

Digital Printing Performance of Cashmere Fabric under Acid or Alkaline Conditions

2011 ◽  
Vol 214 ◽  
pp. 240-244
Author(s):  
Yi Nong Yan ◽  
Xiang Ru Zhang ◽  
Dan Li ◽  
Jian Jian Xu
Keyword(s):  
Ph Value ◽  
Digital Printing ◽  
Dye Uptake ◽  
Printing Quality ◽  
Alkaline Conditions ◽  
Basic Reference ◽  
Minimal Damage ◽  
First Time ◽  
Pretreatment Solution

Pretreatment solution which was obtained by many experiments who had a good printing effect was used to do the digital printing experiment on the cashmere fabric. Printing performance of the cashmere fabric in different pH value was compared to improve the printing quality of the cashmere fabric. Digital printing experiments in the alkaline environment were carried out for the first time and the best pH value was found out which could ensure dye uptake, color fastness, anti-seepage property and minimal damage to cashmere fabric. The paper provided basic reference to the actual production.

Plasma Electrolytic Oxidation (PEO) Coatings on Aluminum Alloys: Kinetics and Formation Mechanism

2019 ◽  
Author(s):  
Alex Lugovskoy ◽  
Lyubov Snizhko
Keyword(s):  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Anodic Polarization ◽  
Point Of View ◽  
Alkaline Solutions ◽  
Inorganic Polymers ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
First Time

In this review, the main kinetics and mechanism regularities of plasma electrolytic oxidation (PEO) of aluminum alloys are discussed. The material and heat balances of the PEO process, including anomalous gas evolution and possible thermochemical reactions are presented for the first time. Side effects accompanying spark discharges from both the surface and the electrolyte sides are analyzed. The influences of electrical regime (direct, alternative, and pulse current) on the rate of coatings growth are summarized from the electrochemical point of view. Different modes of anodic polarization and electrolyte composition (alkaline solutions with inorganic polymers and dispersed constituents) are discussed in the applicative aspect.

scholarly journals Flotation Behavior of Diatomite and Albite Using Dodecylamine as a Collector

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 371 ◽  
Author(s):  
Ying Gao ◽  
Yuexin Han ◽  
Wenbo Li
Keyword(s):  
Unit Area ◽  
Alkaline Ph ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mineral Flotation ◽  
Alkaline Conditions ◽  
Negative Surface ◽  
Negative Surface Charge ◽  
Ph Range ◽  
First Time

The flotation behaviors of diatomite and albite using dodecylamine (DDA) as a collector were investigated and compared. The pure mineral flotation results indicate that the flotability difference between albite and diatomite is above 87% at pH 5.5 to 10.5. The recovery of albite improves with increasing DDA dosage at pH 5.5 to 10.5. In the same pH range, diatomite has weaker flotability than albite, particularly in alkaline pH pulp. Zeta potential measurements indicate that diatomite has a higher negative surface charge than albite at pH 7 to 12, DDA interacts strongly with albite and weakly with diatomite. Thus, DDA preferentially absorbs on albite surface rather than diatomite under alkaline conditions. Fourier transform infrared spectra (FTIR) indicate that the amount of DDA adsorbed to albite is greater than that adsorbed to diatomite, under the same conditions. The adsorption of DDA on the surface of diatomite is investigated by using atomic force microscopy (AFM) for the first time. The adsorption of the collector DDA on the surface of albite per unit area is greater than that on diatomite. This accounts for the lower recovery of diatomite than that of albite.

Template-free synthesis of hierarchical γ-Al2O3 nanostructures and their adsorption affinity toward phenol and CO2

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7066-7073 ◽  
Author(s):  
Weiquan Cai ◽  
Yuzhen Hu ◽  
Jiaguo Yu ◽  
Wenguang Wang ◽  
Jiabin Zhou ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Adsorption Performance ◽  
Adsorption Affinity ◽  
Template Free ◽  
Enhanced Adsorption ◽  
First Time

Hierarchical γ-Al2O3 nanostructures with tunable morphologies, and enhanced adsorption performance towards phenol and CO2 were synthesized for the first time by a facile template-free hydrothermal method using thiourea as precipitating agent.

scholarly journals Nanofiltration of Succinic Acid in Strong Alkaline Conditions

Membranes ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 147 ◽  
Author(s):  
Schlackl ◽  
Herchl ◽  
Samhaber
Keyword(s):  
Electron Microscopy ◽  
Succinic Acid ◽  
Sodium Hydroxide ◽  
Alkaline Solutions ◽  
Fiber Production ◽  
Degree Of Dissociation ◽  
Alkaline Conditions ◽  
Separation Behavior ◽  
Scanning Electron ◽  
Disodium Succinate

Nanofiltration is considered to be an appropriate separation technique in the production of bio-based materials. For the utilization of process streams from the viscose-fiber production, understanding the separation behavior of organic compounds in highly alkaline solutions is necessary. Experiments with succinic acid in sodium hydroxide (NaOH) solutions with varying concentrations up to 5 mol L−1 were performed with the NP030 membrane from Microdyn Nadir. Furthermore, experiments with aqueous disodium succinate and solutions of sodium sulfate in sodium hydroxide were carried out. The influence of concentration ratios and temperature was studied. The Spiegler and Kedem model as well as the Pusch model were applied to fit the experimental data. Additionally, scanning electron microscopy (SEM) and infrared (ATR–IR) measurements were performed to validate the chemical and thermomechanical stability of the membrane. The succinic acid retention varies with its degree of dissociation. In a fully dissociated form, the NaOH concentration shows no impact on the retention. In contrast, the retention of sulfate decreases with increasing NaOH concentration.

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