Bu-Ali Sina University

About: Bu-Ali Sina University is a education organization based out in Hamadan, Hamadān, Iran. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 4078 authors who have published 7969 publications receiving 122828 citations.

Application of green solvents as sorbent modifiers in sorptive-based extraction techniques for extraction of environmental pollutants

Abstract: Lately, application of green solvents has grabbed the attention of many researchers in different fields of study. Green solvents are considered as an alternative to conventional ones and offer several merits include non-toxicity, biocompatibility, biodegradability as well as ease of preparation. Green solvents have been successfully immobilized on the surface of different platforms such as polymers to provide a sustainable media for the extraction and determination of a diverse range of compounds. As an eco-friendly extraction phase, these solvents provide simple, cost-effective, and rapid enrichment of different environmental contaminants. In this account, this review presents the comprehensive overview about the recent advances in the development of green solvents such as deep eutectic solvents (DESs), natural deep eutectic solvents (NADESs), ionic liquids (ILs), surfactants, and bio-derived solvents to modify solid sorbents for the enrichment of different target pollutants from diverse matrices.

Nano-titania-supported Preyssler-type heteropolyacid: An efficient and reusable catalyst in ultrasound-promoted synthesis of 4H-chromenes and 4H-pyrano[2,3-c]pyrazoles

Abstract: An efficient and convenient procedure has been described for one-pot multi-component synthesis of tetrahydrobenzo[b]pyrans known as 4H-chromenes and 1,4-dihydropyrano[2,3-c]pyrazole derivatives in the presence of nano-titania-supported Preyssler-type heteropolyacid, n-TiO2/H14[NaP5W30O110], as a heterogeneous catalyst. The reactions proceeded smoothly under ultrasound irradiation condition to afford the corresponding products in quantitative yields. The catalyst can be easily recovered and reused for several successive fresh runs with no significant loss of catalytic activity.

New portable smartphone-based PDMS microfluidic kit for the simultaneous colorimetric detection of arsenic and mercury

Abstract: A smartphone-based microfluidic platform was developed for point-of-care (POC) detection using surface plasmon resonance (SPR) of gold nanoparticles (GNPs). The simultaneous colorimetric detection of trace arsenic and mercury ions (As3+ and Hg2+) was performed using a new image processing application (app). To achieve this goal, a microfluidic kit was fabricated using a polydimethylsiloxane (PDMS) substrate with the configuration of two separated sensing regions for the quantitative measurement of the color changes in GNPs to blue/gray. To fabricate the microfluidic kit, a Plexiglas mold was cut using a laser based on the model obtained from AutoCAD and Comsol outputs. The colorimetric signals originated from the formation of nanoparticle aggregates through the interaction of GNPs with dithiothreitol – 10,12-pentacosadiynoic acid (DTT-PCDA) and lysine (Lys) in the presence of As3+ and Hg2+ ions. This assembly exhibited the advantages of simplicity, low cost, and high portability along with a low volume of reagents and multiplex detection. Heavy Metals Detector (HMD), as a new app for the RGB reader, was programmed for an Android smartphone to quantify colorimetric analyses. Compared with traditional image processing, this app provided significant improvements in sensitivity, time of analysis, and simplicity because the color intensity is measured through a new normalization equation by converting RGB to an Integer system. As a simple, real-time, and portable analytical kit, the fabricated sensor could detect low concentrations of As3+ (710 to 1278 μg L−1) and Hg2+ (10.77 to 53.86 μg L−1) ions in water samples at ambient conditions.