چكيده به لاتين
The release of colored wastewater from various industries may have toxic environmental risks and affect humans if it accumulates through the food chain. Therefore, it is very important to choose a suitable method to remove colored pollutants in the water environment. Micro-scale liquid-liquid extraction due to its advantages such as reducing material and energy consumption, higher conversion rate and selectivity, the possibility of performing reactions involving dangerous and toxic substances, high surface-to-volume ratio, and reducing analysis time at this scale. Is taken into consideration. In this research, liquid-liquid extraction of crystal violet using diethyl phosphoric acid (D2EHPA) extractant and hexane solvent in Y-shaped microchannel with lengths of 4, 6 and 8 cm and T-shaped microchannel with length of 8 cm was investigated. they got. First, glass microchannels were made by laser method, and then the effect of parameters such as inlet geometry, microchannel length (4-8 cm), color solution pH (3-11), flow rate (1-1.5 mL/h) and the inlet concentration of crystal violet (25-75 ppm) was investigated. The results showed that increasing the length of the microchannel improves the extraction efficiency due to the increase in the contact time of the two phases. Also, the results showed that in the conditions Equally, the Y-shaped microchannel performance is better than the T-shaped microchannel with a contact angle of 90° due to having a suitable ratio of organic and aqueous phases at the microchannel inlet (the highest part of mass transfer) at the contact angle of 56°. Therefore, the extraction efficiency for the microchannel with a length of 8 cm (optimum length), pH = 7, dye input concentration in 50 ppm and flow rate of 1.2 mL/h for Y microchannel is 88.74% and for T microchannel is 81.33%. Color solution phase pH, flow rate, Crystal violet inlet concentration and microchannel length were obtained as optimal conditions for extraction at 10.86, 1.09 mL/h, 64.71 ppm, and 7.72 cm, respectively, and the extraction rate in this case was 96.97%.
