scholarly journals A Brief Overview of TiO2 Photocatalyst for Organic Dye Remediation: Case Study of Reaction Mechanisms Involved in Ce-TiO2 Photocatalysts System

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Milind Pawar ◽  
S. Topcu Sendoğdular ◽  
Perena Gouma
Keyword(s):  
Reaction Mechanisms ◽  
Organic Dye ◽  
World Population ◽  
Photocatalytic Reaction ◽  
Tio2 Photocatalyst ◽  
Bandgap Engineering ◽  
Environmental Cleanup ◽  
Tio2 Photocatalysts ◽  
Photocatalytic Materials

The ever-increasing world population and the rapid growth of industrialization globally make necessary the development of clean technologies and affordable materials for remediating environmental pollution from petroleum-based hydrocarbons and dyes, among others. Advanced photocatalytic materials may provide an excellent solution for environmental cleanup without generating toxic byproducts as they allow for the complete oxidation of the pollutants and their conversion to benign species. In this review, the basic principle of photocatalyst operation and the importance of bandgap engineering are discussed. TiO2 has been the default photocatalyst although it has several shortcomings. Doping of TiO2 with Ce has been explored extensively in the literature as a way to enable visible-light-activated photocatalysis and enhanced efficiency. Recent advances in the synthesis of Ce-modified TiO2 photocatalytic materials along with photocatalytic reaction mechanisms are summarized.

scholarly journals ALD coating of centrifugally spun polymeric fibers and postannealing: case study for nanotubular TiO2 photocatalyst

2021 ◽  
Author(s):  
Martina Rihova ◽  
Oksana Yurkevich ◽  
Martin Motola ◽  
Ludek Hromadko ◽  
Zdeněk Spotz ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Vinyl Pyrrolidone ◽  
Tio2 Photocatalyst ◽  
Polymeric Fibers ◽  
Layer Deposition ◽  
Centrifugal Spinning ◽  
Poly Vinyl Pyrrolidone

This work describes the synthesis of highly photocatalytically active TiO2 tubes (TiTBs) by combining centrifugal spinning and atomic layer deposition (ALD). Poly(vinyl pyrrolidone) (PVP) fibers were first produced by centrifugal...

scholarly journals Sustainability-Oriented Innovations in Food Waste Management Technology

2020 ◽  
Vol 13 (1) ◽  
pp. 210
Author(s):  
Carlos Martin-Rios ◽  
Anastasia Hofmann ◽  
Naomi Mackenzie
Keyword(s):  
Food Waste ◽  
Value Chain ◽  
Cost Effective ◽  
Third Party ◽  
World Population ◽  
Scarce Resources ◽  
Innovation Activities ◽  
Food And Agriculture ◽  
Food And Agriculture Organization

Food is essential to our survival, yet the Food and Agriculture Organization of the United Nations (FAO) estimates that about 820 million people were undernourished in 2018. In this context, food waste generation is a particularly salient issue. Wasting food means missing opportunities to feed the growing world population and consuming scarce resources, such as land, water and energy used in the production, processing, distribution and consumption of food. Firms in HORECA (hospitality, restaurant and catering) represent a considerable share of total food waste and, more importantly, are characterized by an overall low sense of awareness about the sustainability-oriented innovation opportunities and challenges of minimizing food waste. This article draws on an in-depth case study to explore the use of technological advancements in downstream value chain. This case study draws on a tech startup providing services for HORECA companies to address a new way for companies to solve the food waste challenge. Adopting technological innovations to quantify and minimize wastage via collaborations with third-party companies can be a strategic and cost-effective way to supplement a company’s open innovation activities.

scholarly journals Reconstruction of Two Mother-Infant Dyads and Obstetrical Consequences of the Mesolithic-Neolithic Transition: A Case Study from Lepenski Vir and Vlasac (Serbia)

2019 ◽  
Vol 31 (1-2) ◽  
pp. 60-68 ◽  
Author(s):  
J. Jovanović ◽  
P. Frémondière ◽  
S. Stefanović
Keyword(s):  
Brain Size ◽  
Small Sample Size ◽  
Small Sample ◽  
World Population ◽  
Human Species ◽  
Pelvic Morphology ◽  
Neonatal Birth Weight ◽  
Delivery Outcomes ◽  
Lower Protein

The current world population of approximately seven billion people shows that despite the complexities of human birthing, the human species is thriving. Changes in human pelvic morphology resulting from bipedalism and encephalisation, often described as the “obstetric dilemma”, have made the birthing process extremely difficult and risky for both mothers and neonates. The major Mesolithic- Neolithic shift in lifestyle could have had important obstetric consequences. It is often hypothesised that the shift to an agricultural diet, with a lower protein content and higher glycaemic loading than the hunter-gatherer diet, could have led to a decrease in maternal height and an increase in neonatal birth weight, brain size and foetal-pelvic strain, which may have exacerbated the obstetric dilemma. The Mesolithic-Neolithic osteological collection from the Danube Gorges (7400-5500 cal BC, Balkans) provides material (2 pelvises and a neonate skull) to test this hypothesis by virtually reconstructing the fossil dyads and their foetal-pelvic relationship.We compared these dyads with a large obstetrical sample of mother-child dyads with a known birthing history, conducting a lineardiscriminant analysis in order to predict the most probable delivery outcomes for the prehistoric dyads. The results suggest that delivery was dystocic for the Mesolithic motherchild dyad and eutocic for the Neolithic mother-child dyad; obstetrically, the former is notably more efficient. However, due to the small sample size, further research is required with a larger series in order to determine whether the development of obstetrically efficient pelvic bones in the Neolithic was widespread and whether it had an impact on the birthing process and thus potentially contributed to the increasing size of the population.

Tacit Knowledge Utilization for Global Impact and Organizational Practices

2020 ◽  
pp. 1219-1240
Author(s):  
Aleksander Janeš ◽  
Roberto Biloslavo ◽  
Armand Faganel
Keyword(s):  
Tacit Knowledge ◽  
Business Models ◽  
Fish Farming ◽  
Business Environment ◽  
World Population ◽  
Farmed Fish ◽  
Sustainable Business ◽  
Viable Solution ◽  
Sustainable Business Models

The aquaculture sector stands at a crossroad because of the important changes in the business environment. Demand and competition for food is growing worldwide, fishery sector reached its limits and in this regard farmed fish sector represents a viable solution for food supply. A sustainable development of small business is recommended in order to develop knowledge and skills to support the growth of world population. In this view knowledge management for innovation is crucial to promote sustainable business models (BM) that can achieve a solid economic performance and at the same time take care of the natural environment. The purpose of this chapter is to contribute to the literature about sustainable BMs by an in-depth case study of a small fish farming company which developed competitiveness based on own tacit knowledge. The exemplary case study of a sustainable BM in aquaculture has been analyzed by use of an enhanced BM canvas that links various market oriented elements of a BM with the needs of society.

scholarly journals Visible Light Photocatalytic Activity of Thin Film Coated on Polycarbonate Surface with N- and Ni-Codoped TiO2 Photocatalyst

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1237
Author(s):  
Byung-Geon Park ◽  
Chang-Ho Lee ◽  
Kyong-Hwan Chung
Keyword(s):  
Thin Film ◽  
Visible Light ◽  
Pathogenic Bacteria ◽  
Sol Gel ◽  
Photocatalytic Reaction ◽  
Tio2 Photocatalyst ◽  
E Coli ◽  
Amorphous Tio2 ◽  
Visible Light Photocatalytic ◽  
Decomposition Properties

N- and Ni-coated TiO2 (NNT) were prepared by a facile sol-gel method as a photosensitive photocatalyst to visible light. NNT sol was used to coat the surface of an LED lamp cap and body made of polycarbonate with a thin NNT film. The coated thin film was dried in an oven at 130 °C. This NNT thin film had an amorphous TiO2 structure and absorbed 600 nm of visible light. The decomposition properties of formaldehyde on the NNT photocatalyst after irradiation with visible light were investigated. The LED lamp was irradiated with visible light at 500–620 nm and 6 W. Formaldehyde was decomposed by a photocatalytic reaction by visible light irradiation on the NNT-coated polycarbonate surface. Escherichia coli (E. coli), Staphylococcus aureus, and Pseudomonas aeruginosa were also used to examine the sterilizing properties of pathogenic bacteria using an LED lamp kit. The pathogenic bacteria on the NNT-coated polycarbonate surface were sterilized by irradiation with visible light.

scholarly journals Environmental Comfort as a Sustainable Strategy for Housing Integration: The AURA 1.0 Prototype for Social Housing

2020 ◽  
Vol 10 (21) ◽  
pp. 7734
Author(s):  
Álvaro López-Escamilla ◽  
Rafael Herrera-Limones ◽  
Ángel Luis León-Rodríguez ◽  
Miguel Torres-García
Keyword(s):  
Latin American ◽  
Social Housing ◽  
World Population ◽  
Design Strategies ◽  
Solar Decathlon ◽  
Natural Lighting ◽  
Human Habitat ◽  
The University ◽  
The Relationship

The AURA 1.0 prototype is a sustainable social housing proposal, designed by the University of Seville and built for the first Latin American edition of the prestigious Solar Decathlon competition. Different conditioning strategies were integrated into this prototype, optimized for a tropical climate, and focused on contributing positively to the health of the most humble people in society. In this moment, in which a large part of the world population is confined to their homes due to the Covid-19 pandemic, we have the opportunity (and the obligation) to reconsider the relationship between architecture and medicine or in other words, between the daily human habitat and health. For this reason, this analysis of aspects derived from the interior conditioning of the homes is carried out. The main objective of the Aura proposal is to be able to extract data through a housing monitoring system, which allows us to transfer some design strategies to the society to which is a case study, in order to promote environmental comfort and, therefore, people’s health. The AURA 1.0 prototype develops flexible and adaptable living spaces, with a high environmental quality, in order to maintain the variables of temperature, relative humidity and natural lighting within a range of comfort required by the rules of the event. To achieve this end, the prototype develops an architectural proposal that combines passive and active conditioning strategies, using construction qualities and typical costs of social housing. These strategies allowed the project to achieve the first prize in the Comfort Conditions test. So, this paper presents an appropriate and tested solution that can satisfy comfortability and health of residents who live in social housing while maintaining low energy consumption.

Plaster Pigments in Traditional Folk Architecture - A Case Study from Moravia (Czech Republic)

2014 ◽  
Vol 1000 ◽  
pp. 289-293
Author(s):  
Dalibor Všianský
Keyword(s):  
Organic Dye ◽  
Blue Pigment ◽  
Raman Spectrometry ◽  
Central European ◽  
X Ray ◽  
Green Earth ◽  
Electron Microanalysis ◽  
Red Dye ◽  
Green Pigments

The results of analyses of coloured plasters are given in the paper. The samples come from traditional folk earth houses from SE and Central Moravia and were chosen so as all of the most common colours of the Central European folk architecture are present among them: red, yellow, blue, green, and black. The analyses were conducted by the means of light microscopy, which is also a powerful tool for stratigraphical analyses, X-ray diffractometry, Raman spectrometry, end electron microanalysis. Hematite of industrial origin was identified as the red pigment, the yellow one was formed by yellow earth, which also may be a precursor for traditional production of red dye. The widest used blue pigment was ultramarine in the 19th and the first half of 20th century in Moravia. The analysed green pigments were formed by an organic dye of green earth and the black one consisted of soot. Based on the sort and composition of pigment and plaster, the age of the material is also discussed.

scholarly journals Improvement of the Efficiency of TiO2 Photocatalysts with Natural Dye Sensitizers Anthocyanin for the Degradation of Methylene Blue: Review

2021 ◽  
Vol 16 (2) ◽  
pp. 84-99
Author(s):  
Hendrini Pujiastuti ◽  
Indar Kustiningsih ◽  
Slamet Slamet
Keyword(s):  
Visible Light ◽  
Dye Degradation ◽  
Low Cost ◽  
Electron Excitation ◽  
Band Gap Energy ◽  
Natural Dye ◽  
Tio2 Photocatalyst ◽  
Tio2 Photocatalysts ◽  
Dye Sensitizer ◽  
Potential Methods

One of the potential methods utilized for dye degradation is photocatalitic, due to its low cost, highly effective, and environmentally friendly. Effectivenes of TiO2 photocatalysts can be enhanced by adding a dye sensitizer. Dye-sensitizer material absorbs visible light to facilitate electron excitation process. Addition of dye-sensitizer on TiO2 photocatalyst promotes it to be more responsive to visible light. Natural anthocyanin dyes are often used as sensitizers of TiO2 semiconductors. Anthocyanins are, usually in the purple to the red color range, a group of natural dyes found in the flowers, leaves, and fruit of plants. The essential principles of dye sensitization to TiO2 have been explored in this review. It is feasible to reduce the band gap energy in the TiO2 photocatalyst by modifying it using a natural dye sensitized modification. Dye sensitizers on TiO2 nanotubes plate have the potential to be employed in a dye degradation photocatalytic system

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