Adsorption behavior of l-cysteine on Ag nanoparticles under water environment studied by S K-edge NEXAFS

2012 ◽  
Vol 262 ◽  
pp. 231-233 ◽  
Author(s):  
C. Tsukada ◽  
S. Yagi ◽  
T. Nomoto ◽  
T. Mizutani ◽  
S. Ogawa ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Water Environment ◽  
Adsorption Behavior

scholarly journals Preparation and Removal Properties of Cimetidine from Aqueous Solution by Waste Bricks Incorporated with Different Iron Oxides

2019 ◽  
Vol 9 (16) ◽  
pp. 3346
Author(s):  
Zhang ◽  
Liu ◽  
Xu ◽  
Chen ◽  
Tan ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Ph Value ◽  
Water Environment ◽  
Outer Sphere ◽  
Adsorption Behavior ◽  
Iron Species ◽  
Simple Method ◽  
Construction Waste ◽  
Adsorption Sites ◽  
New Methods

In this study, to investigate the elimination of micropollutant from aqueous solutions by construction waste, waste red brick (WRB) with and without incorporated of iron species (goethite and hematite) were prepared by a simple method. The prepared materials were systematically characterized and batch experiments were conducted to study the elimination of typical micropollutant cimetidine from the water environment. Results showed that both two iron species could be successfully incorporated onto WRB and the main structure of WRB were maintained. The adsorption process of cimetidine onto bricks was fast due to the microstructure and useful adsorption sites on the surface of bricks. The Langmuir model fitted the experimental data better and the qmax of cimetidine increased about 24.4% and 39.6% for the incorporation of hematite and goethite, respectively. The pH values influenced the adsorption behavior greatly and the favorable pH value was around 6.0. The charge screening effect and competition adsorption may influence the adsorption behavior together. Due to the interaction between cimetidine and bricks, the outer-sphere complexation may be formed in the adsorption process. This study shows new methods for the elimination of the micropollutant from the water environment and offers useful guidelines for the reuse of construction waste.

scholarly journals Adsorption Behavior of Polyelectrolyte onto Alumina and Application in Ciprofloxacin Removal

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1554
Author(s):  
Thi Huong Dao ◽  
Ngoc Trung Nguyen ◽  
Minh Ngoc Nguyen ◽  
Cao Long Ngo ◽  
Nhu Hai Luong ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Particle Surface ◽  
Water Environment ◽  
Adsorption Behavior ◽  
Optimum Conditions ◽  
Adsorption Model ◽  
Order Model ◽  
Alumina Particles ◽  
Pseudo Second Order ◽  
Positively Charged

This study aims to investigate the adsorption behavior of a strong polyelectrolyte poly(styrenesulfonate) (PSS) onto alumina particles. Adsorption of PSS onto positively charged alumina surface increased with increasing ionic strength, indicating that non-electrostatic and electrostatic interaction controlled the adsorption. The removal of an emerging antibiotic ciprofloxacin (CFX) from water environment using PSS-modified alumina (PMA) was also studied. The removal of CFX using PMA was much higher than that using alumina particles without PSS modification in all pH ranges of 2–11. The removal of CFX reached 98% under the optimum conditions of pH 6, contact time of 120 min, adsorbent dosage of five milligrams per milliliter and ionic strength 104-M NaCl. The adsorption isotherms of CFX at different salt concentrations fit well with a two-step adsorption model, while the adsorption kinetic fit well with a pseudo-second-order model with a good correlation coefficient (R2 > 0.9969). The CFX-removal from a hospital wastewater using PMA was more than 75%. Our study demonstrates that adsorption of PSS onto alumina to modify the particle surface is important to form a novel adsorbent PMA for CFX-removal from water environments.

Hydrothermal preparation of TiO2-Ag nanoparticles and its antimicrobial performance against human pathogenic microbial cells in water

BIOCELL ◽  
2018 ◽  
Vol 42 (3) ◽  
pp. 93-97 ◽  
Author(s):  
Mahmoud MOUSTAFA ◽  
Saad ALAMRI ◽  
Mohamed ELNOUBY ◽  
Tarek TAHA ◽  
M. A. ABU-SAIED ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Hydrothermal Preparation ◽  
Microbial Cells ◽  
Antimicrobial Performance

Preparation of nanocomposite hydrogels with nanoclay: characterization, swelling properties and dye adsorption behavior

2020 ◽  
Vol 65 (2) ◽  
pp. 119-133
Author(s):  
Nesrimne SEDIIKI ◽  
◽  
Djamel ALIOUCHE ◽  
Imene BOUDHENE ◽  
◽  
...  
Keyword(s):  
Dye Adsorption ◽  
Adsorption Behavior ◽  
Swelling Properties ◽  
Nanocomposite Hydrogels

A Biological Approach of Silver (Ag) Nanoparticles Synthesis Using Leaf Extract of Adhatoda Vasica

2012 ◽  
Vol 3 (2) ◽  
pp. 177-179
Author(s):  
Dr. K.Vinoth Kumar Dr. K.Vinoth Kumar ◽  
◽  
Dr. C. Udayasoorian Dr. C. Udayasoorian
Keyword(s):  
Ag Nanoparticles ◽  
Leaf Extract ◽  
Adhatoda Vasica ◽  
Biological Approach ◽  
Nanoparticles Synthesis

Establishing an empirical equation for the relationship between total suspended solids and total phosphorus concentrations in the downstream Red river water

2020 ◽  
Vol 20 (3) ◽  
pp. 325-332
Author(s):  
Le Nhu Da ◽  
Le Thi Phuong Quynh ◽  
Phung Thi Xuan Binh ◽  
Duong Thi Thuy ◽  
Trinh Hoai Thu ◽  
...  
Keyword(s):  
Total Phosphorus ◽  
Suspended Solids ◽  
Empirical Relationship ◽  
Water Environment ◽  
Total Suspended Solids ◽  
River System ◽  
Red River ◽  
Reservoir Impoundment ◽  
Downstream Section ◽  
Reasonable Prediction

Recently, the Asian rivers have faced the strong reduction of riverine total suspended solids (TSS) flux due to numerous dam/reservoir impoundment. The Red river system is a typical example of the Southeast Asian rivers that has been strongly impacted by reservoir impoundment in both China and Vietnam, especially in the recent period. It is known that the reduction in total suspended solids may lead to the decrease of some associated elements, including nutrients (N, P, Si) which may affect coastal ecosystems. In this paper, we establish the empirical relationship between total suspended solids and total phosphorus concentrations in water environment of the Red river in its downstream section from Hanoi city to the Ba Lat estuary based on the sampling campaigns conducted in the dry and wet seasons in 2017, 2018 and 2019. The results show a clear relationship with significant coefficient between total suspended solids and total phosphorus in the downstream Red river. It is expressed by a simple equation y = 0.0226x0.3867 where x and y stand for total suspended solids and total phosphorus concentrations (mg/l) respectively with the r2 value of 0.757. This equation enables a reasonable prediction of total phosphorus concentrations of the downstream Red river when the observed data of total suspended solids concentrations are available. Thus, this work opens up the way for further studies on the calculation of the total phosphorus over longer timescales using daily available total suspended solids values.

DEVELOPMENT OF INTEGRATED MONITORING NETWORK FOR MEASURING SALINITY OF SEA WATER

2018 ◽  
pp. 18-26
Author(s):  
Sima Ajdar qizi Askerova
Keyword(s):  
Surface Waters ◽  
Sea Water ◽  
Water Environment ◽  
Monitoring Network ◽  
Monitoring Networks ◽  
The Caspian Sea ◽  
Integrated Monitoring ◽  
Ecological Control ◽  
Different Depths ◽  
Optimal Construction

Monitoring of sea water condition is one of major requirements for carrying out the reliable ecological control of water environment. Monitoring networks contain such elements as sea buoys, beacons, etc. and are designated for measuringvarious hydrophysical parameters, including salinity of sea water. Development of specialized network and a separate buoy system for measuring thesea water salinity at different depths makes it possible to determine major regularities of processes of pollution and self-recovery of the sea waters. The article describes the scientific and methodological basics for development of this specialized network and questions of its optimal construction. It is well-known that at a depth of 30-45 m of the Caspian Sea salinity decreases and then at a depth of 45-60 m salinity is fully recovered. The mentioned changes of salinity at the relatively upper layer of sea waters is of special interest for studying the effect of ocean-going processes on the climate forming in the Caspian area. In terms of informativeness of measurements of surface waters salinity, the most informative is a layer ata 30-60 m depth, where inversion and recovery of salinity take place. It is shown that in most informative subrange of measurements, i. e. at a depth of 30-60 m optimization of regime of measurements complex should be carried out in order to increase the effectiveness of held researches. It is shown that at a depth of 35-50 m choice of the optimum regime of measurements makes it possible to obtain the maximum amount of information.

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