Three-dimensional carbon boron nitrides with a broken, hollow, spherical shell for water treatment

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78252-78256 ◽  
Author(s):  
Huichao Jia ◽  
Jie Li ◽  
Zhenya Liu ◽  
Ruoyuan Gao ◽  
Saleem Abbas ◽  
...  
Keyword(s):  
Water Treatment ◽  
Spherical Shell ◽  
Water Purification ◽  
Three Dimensional ◽  
Dye Adsorption ◽  
Adsorption Rate ◽  
Boron Nitrides ◽  
Hollow Spherical Shell

Broken hollow spherical shell like 3D C-BNs with a very fast dye adsorption rate for water purification.

scholarly journals Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1338 ◽  
Author(s):  
Klara Perović ◽  
Francis M. dela Rosa ◽  
Marin Kovačić ◽  
Hrvoje Kušić ◽  
Urška Lavrenčič Štangar ◽  
...  
Keyword(s):  
Water Treatment ◽  
Transition Metal ◽  
Photocatalytic Degradation ◽  
Water Splitting ◽  
Water Purification ◽  
Degradation Mechanism ◽  
Living Environment ◽  
Solar Irradiation ◽  
Metal Chalcogenides ◽  
Photocatalytic Water Splitting

Clean water and the increased use of renewable energy are considered to be two of the main goals in the effort to achieve a sustainable living environment. The fulfillment of these goals may include the use of solar-driven photocatalytic processes that are found to be quite effective in water purification, as well as hydrogen generation. H2 production by water splitting and photocatalytic degradation of organic pollutants in water both rely on the formation of electron/hole (e−/h+) pairs at a semiconducting material upon its excitation by light with sufficient photon energy. Most of the photocatalytic studies involve the use of TiO2 and well-suited model compounds, either as sacrificial agents or pollutants. However, the wider application of this technology requires the harvesting of a broader spectrum of solar irradiation and the suppression of the recombination of photogenerated charge carriers. These limitations can be overcome by the use of different strategies, among which the focus is put on the creation of heterojunctions with another narrow bandgap semiconductor, which can provide high response in the visible light region. In this review paper, we report the most recent advances in the application of TiO2 based heterojunction (semiconductor-semiconductor) composites for photocatalytic water treatment and water splitting. This review article is subdivided into two major parts, namely Photocatalytic water treatment and Photocatalytic water splitting, to give a thorough examination of all achieved progress. The first part provides an overview on photocatalytic degradation mechanism principles, followed by the most recent applications for photocatalytic degradation and mineralization of contaminants of emerging concern (CEC), such as pharmaceuticals and pesticides with a critical insight into removal mechanism, while the second part focuses on fabrication of TiO2-based heterojunctions with carbon-based materials, transition metal oxides, transition metal chalcogenides, and multiple composites that were made of three or more semiconductor materials for photocatalytic water splitting.

scholarly journals Hypercrosslinked porous polymers hybridized with graphene oxide for water treatment: dye adsorption and degradation

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13417-13422 ◽  
Author(s):  
Yipeng Huang ◽  
Guihua Ruan ◽  
Yuji Ruan ◽  
Wenjuan Zhang ◽  
Xianxian Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Treatment ◽  
Dye Adsorption ◽  
Porous Polymers ◽  
Internal Phase

We report the synthesis of graphene oxide hybridized polymeric high internal phase emulsions and their applications in adsorption and photocatalysis.

Enhancement of Efficiency of the Ural Region Surface Water Sources Water Treatment in Terms of Metal Ions and their Compounds

2012 ◽  
pp. 96-108
Author(s):  
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Metal Ions ◽  
Water Purification ◽  
Solid Phase ◽  
Ural Region ◽  
Iron Aluminum ◽  
High Degree ◽  
Water Hydrogen ◽  
Sorption Characteristics

Sorption characteristics of “Ekozol-401” high-dispersed solid-phase agent in water solutions containing ions of iron, aluminum and manganese have been studied. Influence of the sorbent content, extracted metals’ concentration, saline background, hardness and alkalinity, water hydrogen indicator value as well as amount of modifier contained in the solid-phase agent have been stated. High degree of water purification in terms of the said ions has been demonstrated.

Three-dimensional (3D) palladium-zinc oxide nanowire nanofiber as photo-catalyst for water treatment

2016 ◽  
Vol 101 ◽  
pp. 362-369 ◽  
Author(s):  
Jungsu Choi ◽  
Sophia Chan ◽  
Hyunjong Joo ◽  
Heejae Yang ◽  
Frank K. Ko
Keyword(s):  
Zinc Oxide ◽  
Water Treatment ◽  
Three Dimensional ◽  
Photo Catalyst ◽  
Zinc Oxide Nanowire

scholarly journals Instrumentation of the combined processes in water treatment technology

2020 ◽  
Vol 16 (5) ◽  
pp. 55-62
Author(s):  
V. V. Borodychev ◽  
A. E. Novikov ◽  
M. I. Lamskova ◽  
M. I. Filimonov
Keyword(s):  
Water Treatment ◽  
Organic Compounds ◽  
Water Purification ◽  
Irrigation Water ◽  
Plant Cover ◽  
Oil Products ◽  
Morphological Properties ◽  
Combined Processes ◽  
Drain Pipe ◽  
Standard Design

An increase in the volume of industrial effluents, ship accidents, oil breakthroughs at drilling rigs lead to a deterioration in the quality indicators of water in open water sources, including in terms of the content of organic compounds and oil products. The water used for irrigation of agricultural crops, according to most indicators, must meet the water quality requirements for household and drinking purposes. Thus, the total content of oil products in the irrigation water should not exceed 0.1 mg / l. The use of water with the MPC excess leads to significant changes in the morphological properties of the soil, reduces the biological productivity and phytomass of the plant cover. Therefore, the issue of improving machines and devices used in water treatment technologies to increase their reliability and efficiency is one of the topical areas of the research. The aim of the study is to develop a hydrocyclone complex cleaning apparatus, which implements combined processes of capturing both coarse and finely dispersed impurities. Unlike the standard design, the hydrocyclone is supplemented with a filter element installed on the drain pipe, which provides additional water purification from fine mechanical impurities, and a sorption filter designed to remove oil products and other floating organic compounds from water. The proposed hydrocyclone unit provides a comprehensive purification of irrigation water from various types of impurities, due to the combined processes of centrifugal separation and sorption filtration. It eliminates the multistage process of water purification, and regeneration of the sorption filter by the action of centrifugal forces or pressure does not require the use of special regenerating solutions, which increases the manufacturability and environmental friendliness of the water treatment process.

A metal–organic gel based on silver salt and 2-amino-5-mercapto-1,3,4-thiadiazole with high antibacterial activity and excellent dye adsorption performance

2016 ◽  
Vol 40 (11) ◽  
pp. 9125-9131 ◽  
Author(s):  
Yong Cheng ◽  
Qichun Feng ◽  
Ming Yin ◽  
Xiaoyan Ren ◽  
Jianzhong Wang ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Water Treatment ◽  
Silver Salt ◽  
Dye Adsorption ◽  
Adsorption Performance ◽  
High Antibacterial Activity ◽  
Treatment Agent ◽  
Metal Organic ◽  
Organic Gel

A novel Ag(i)–AMTD metal–organic gel may serve as a difunctional water treatment agent.

scholarly journals Nanomaterials Based Drinking Water Purification: Comparative Study with a Conventional Water Purification Process

2018 ◽  
Vol 63 (1) ◽  
pp. 96-112 ◽  
Author(s):  
Barış Şimşek ◽  
İnci Sevgili ◽  
Özge Bildi Ceran ◽  
Haluk Korucu ◽  
Osman Nuri Şara
Keyword(s):  
Silver Nanoparticles ◽  
Drinking Water ◽  
Graphene Oxide ◽  
Water Treatment ◽  
Water Purification ◽  
Drinking Water Treatment ◽  
Treatment Method ◽  
Salmonella Typhi ◽  
Liquid Ratio ◽  
Solid Liquid

One of the ways of fully securing the presence of fresh water is water treatment process. Nanomaterials and nanotechnology offers an innovative solution for water treatment. In this study, physical, chemical and microbiological improvement rates of raw water were analyzed after filtration with graphene oxide. Graphene oxide's water treatment performance; silver nanoparticles, silver nanoparticles & graphene oxide composites that are commonly used in water treatment were compared with a traditional treatment method. When compared to the traditional method, there were improvements of 50 %, 40.7 %, 86.8 % and 45.5 % for color, TIC, TOC and hardness properties, respectively in water treatment by GO-based filtration with solid liquid ratio of 0.7 % (v/v). In water treatment with GO-Ag based filtration, 39.8 %, 69.8 %, 10.3 % and 28.6 % of improvements were obtained for TIC, TOC, hardness and LSI value compared to the conventional method. Both GO at 0.7 % (v/v) solid-liquid ratio and GO-Ag nanocomposites were successful in the number of total viable microorganisms and inhibiting microorganisms such as Escherichia coli fecal (gaita-infected), Salmonella typhi, Enterococcus faecalis, Pseudomona aeruginosa and Staphylococcus aureus. Among the studied parameters GO-Ag nanocomposites found to be the most suitable for drinking water treatment.

scholarly journals Density Stratification Effects on the Thermal Convection in a Rotating Spherical Shell

2001 ◽  
Vol 203 ◽  
pp. 195-197
Author(s):  
N. Nishikawa ◽  
K. Kusano
Keyword(s):  
Spherical Shell ◽  
Thermal Convection ◽  
Structural Transition ◽  
Rotation Axis ◽  
Three Dimensional ◽  
Density Stratification ◽  
Nonlinear Convection ◽  
Solar Convection Zone ◽  
Solar Convection ◽  
The Stability

The density stratification effects on the thermal convection in a rotating spherical shell, which is the representative of the solar convection zone, are investigated by three dimensional numerical simulations. It is found that, the convection structure in the strongly stratified system is switched from parallel cells aligned to the rotation axis to zonal rolles dominated by the longitudinally averaged mode, as the Rayleigh number increases much larger than the stability threshold. Corresponding to this structural transition, the averaged kinetic helicity reverses the sign in each hemisphere (from negative to positive in the northern hemisphere). The results indicate that the density stratification is much important for the nonlinear convection process in the rotating spherical shell.

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