Heavy metals are a major cause of environmental pollution, and mercury is a well-known toxicant that is extremely harmful to the environment and human health. In this study, new carbon nanotubes coated with cobalt and molybdenum nanoparticles (Co-Mo/MWCNT) were used for Hg0 removal from the air by the amalgamation of solid-phase air removal method (ASPAR). In the bench-scale setup, the mercury vapor in air composition was produced by the mercury vapor generation system (HgGS) and restored in a polyethylene airbag . In optimized conditions, the mercury vapor in the airbag passed through Co-Mo/MWCNT and was absorbed on it. Then, the mercury was completely desorbed from Co-Mo/MWCNT by increasing temperature up to 220 °C and online determined by cold vapor atomic absorption spectrometry (CV-AAS). The recovery and capacity of Co-Mo/MWCNT were obtained at 98% and 191.3 mg g-1, respectively. The Repeatability of the method was 32 times. The mercury vapors absorbed on Co-Mo/MWCNT adsorbent could be maintained at 7 days at the refrigerator temperature. The Co-Mo/MWCNT as a sorbent has many advantages such as; high capacity, renewable, good repeatability and chemical adsorption (amalgamation) of mercury removal from the air. The method was successfully validated by MCA and spiking of real samples.
Toluene is one of the most dangerous and, simultaneously, the most consumed substances in various factories. Toluene strongly affects the central nervous system. The numerous side effects caused by exposure to toluene indicate the removal of toluene vapours from the air in the workplace. This study aims to use the removal of toluene vapours from the air using a Fe-MOFs metal-organic substrate for the first time in the world and to investigate efficient methods to increase the efficiency of removing toluene vapours from the air. This experimental study was carried out on a laboratory scale. After the iron metal-organic framework (Fe-MOFs) was synthesized, the components affecting the adsorption rate, such as reaction time (5-20 min), initial concentration (100-400 mg L-1), adsorbent amount, and temperature (25-80oC) were analyzed and optimized. Then, the efficiency of removing toluene vapours from the air was determined using a gas chromatography device. The absorption capacity of toluene was obtained by the desired adsorbent, 337.2 mg g-1. Also, the effect of different parameters on toluene absorption was investigated and optimized. The maximum absorption for concentration (300 mg L-1), temperature (75oC), and contact time (160s) obtained as 340 mg g-1, 331 mg g-1, and 325 mg g-1, respectively.
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