6,7,8,9,10,11,12,13-Octa­hydro-5H-1,3-dithiole[4,5-b][1,4]dithia­cyclo­tridecine-2-thione

In the crystal structure of the title compound, C12H18S5, no significant inter­molecular π–π inter­actions are found. Weak inter­molecular C—S⋯π [S⋯centroid = 3.787 (1) Å] inter­actions and van der Waals forces may be effective in the stabilization of the structure

Photocatalytic Degradation of Methylene Blue under UV Light Irradiation on Prepared Carbonaceous TiO

This study involves the investigation of altering the photocatalytic activity of TiO2 using composite materials. Three different forms of modified TiO2, namely, TiO2/activated carbon (AC), TiO2/carbon (C), and TiO2/PANi, were compared. The TiO2/carbon composite was obtained by pyrolysis of TiO2/PANi prepared by in situ polymerization method, while the TiO2/activated carbon (TiO2/AC) was obtained after treating TiO2/carbon with 1.0 M KOH solution, followed by calcination at a temperature of 450°C. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), thermogravimetric analysis (TG-DTA), Brunauer-Emmet-Teller (BET), and UV-Vis spectroscopy were used to characterize and evaluate the prepared samples. The specific surface area was determined to be in the following order: TiO2/AC > TiO2/C > TiO2/PANi > TiO2 (179 > 134 > 54 > 9 m2 g−1). The evaluation of photocatalytic performance for the degradation of methylene blue under UV light irradiation was also of the same order, with 98 > 84.7 > 69% conversion rate, which is likely to be attributed to the porosity and synergistic effect in the prepared samples

A novel poly(ethyleneoxide)-based magnetic nanocomposite catalyst for highly efficient multicomponent synthesis of pyran derivatives

In the present work, a new magnetically recyclable nanocomposite catalyst was designed, prepared, and characterized by Fourier transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (FE-SEM) images, X-ray diffraction (XRD) pattern, energy-dispersive X-ray (EDX), vibrating sample magnetometer (VSM), and transmission electron microscopy (TEM) analyses. Then, the catalytic activity of the prepared Fe3O4/PEO/SO3H nanocatalyst was examined on multicomponent synthesis of 2-amino-3-cyano-4H-pyranes. Short reaction time, room temperature, good-to-excellent yields, easy catalyst separation and catalyst reusability, environmentally benign and efficient conditions are some advantages of this green protocol

Green Material Prospects for Passive Evaporative Cooling Systems: Geopolymers

Passive cooling techniques have been used mostly in countries with hot and arid climates such as Iran, Egypt, and India. However, the use of this important technology has not been seriously considered until a time of energy crisis, and consequently, environmental crisis scenarios, emerge. Scholars have renewed their interest in investigating passive cooling technology, particularly the aspects of new materials, thermal comfort, energy efficiency, new designs, climate, and environmental considerations. This review paper highlights the opportunities to use green materials, such as geopolymers, as evaporative cooling materials with different types of industrial and agricultural waste products as components. Novel ideas for passive cooling design using ancient and nature-inspired concepts are also presented to promote green technology for future applications

Nanoceluloza z odpadów rolniczych jako potencjalny materiał nanotechnologiczny

It has been shown that in the last decades nanotechnology plays a key role not only in science but more and more of ten in industry as well. Recent research has shown that agricultural waste is a possible feedstock to produce nanocellulose which can be used for diff erent applications, such as a biosensor, semiconductor and reinforcing agent. The use of agro-waste as a precursor not only off ers advantages for raw material costs, but also for the climate, low processing costs, availability and convenience. It also helps to address environmental issues, such as illness, foul odor and concerns with indoor use. Diff erent processes, such as chemical treatment, mechanical treatment and chemo-mechanical treatment, have been used to extract nanocellulose from agro-waste. This article highlights the latest technologies used to acquire agro-waste nanocellulose, as well as existing advances in and applications of nanocellulose technologies.W ostatnich dziesięcioleciach nanotechnologia odgrywa kluczową rolę nie tylko w nauce, ale coraz częściej także w przemyśle. Wyniki prowadzonych badań wskazują, że odpady rolnicze mogą stanowić potencjalny surowiec do produkcji nanocelulozy. Wiadomo, że nanoceluloza jest doskonałym materiałem do różnych zastosowań, m.in. jako biosensor, półprzewodnik i czynnik wzmacniający – włókna. Wykorzystanie agroodpadów jako surowca jest korzystne nie tylko ze względu na ich cenę, ale także ze względu na potencjalnie niewielki wpływ na klimat, niskie koszty i łatwość przetwarzania oraz dostępność. Niweluje również możliwe problemy wynikające z emisji nieprzyjemnych zapachów i ich negatywnego wpływu na zdrowie organizmów żywych. Do ekstrakcji nanocelulozy z agroodpadów stosuje się procesy obróbki chemicznej, obróbki mechanicznej i obróbki chemiczno-mechanicznej. Przedstawiono najnowsze technologie wykorzystywane do pozyskiwania nanocelulozy zagroodpadów, a także dotychczasowe postępy i zastosowania technologii zużyciem nanocelulozy