gold nanoparticles supported iron-based btc (aunps/ fe-btc) metal–organic frameworks as a fluorescence sensor for the selective detection of as (iii) in contaminated waters

Disposal of industrial effluents and wastewaters is considered as one of the most important challenges in the industrial world today. due to the toxic ingredients of these effluents such as, heavy metal ions, dyes, organic compounds and other pollutants are the main cause of pollution of rivers, lakes and underground waters. inorganic as(iii) and as(v) are the major arsenic species in natural water resources with the former dominating in the reducing atmosphere while the latter is more stable in the oxidizing environment. world health organizations (who) prescribed 10 μg/l as the highest tolerance level for arsenic in drinking water [1, 2]. fluorescence-based chemical sensors have attracted enormous research attention because of their rapid responses, high sensitivities, and the ease of preparation. in this regard, metal-organic frameworks (mofs) have been recently developed as the sustainable platforms to detect trace amounts of contaminants present in water, due to their large specific surface areas, extremely high porosities, and tunable structures and functions [3]. in the present work, a gold-based fluorescent mof was synthesized and applied as a highly sensitive and quickly responsive chemical sensor for as(iii) detection in wastewater samples. here, we applied a mof, fe-btc (btc= 1,3,5-benzenetricarboxylate), as a porous template to trap gold nanoparticles as arsenic-sensitive sites. the fluorescence intensity of this sensor increased significantly with increasing in as (iii) concentration. the ft-ir, xrd, edx-mapping and sem were used to characterize the synthesized au-fe-btc mof. the main effective factors on the performance of this sensor such as nanocomposite dose, ultrasonic time, ph value, type, and volume of buffer and reaction time were optimized by changing one single variable at a time method. under optimized conditions, the calibration curve was linear in the concentration range of 30-80 μg/l of as (iii) and limit of detection was 33 µg/l. five real samples including two water samples of karun river, bahmanshir river, tap water and two wastewater effluent of petrochemical company were used for determination of as (iii) and recovery percentages obtained were in the range of 95.4-105%.