Shape-Selective Adsorption of Substituted Aniline Pollutants from Wastewater

Abstract

ZSM-5 zeolite was used to treat wastewater containing aniline, 2-nitroaniline (2-NA), 3-nitroaniline (3-NA) and 4-nitroaniline (4-NA). Each molecule was removed from aqueous solution by Type I Langmuir adsorption onto ZSM-5. The quantities adsorbed varied greatly due to their shape-selective adsorption within the pores of ZSM-5. Aniline and 4-NA had maximum adsorption amounts of 161 and 265 mg g -1 , respectively, while the maximum amounts of 3-NA and 2-NA were 94.3 and 37.2 mg g -1 , corresponding to reductions of 64% and 86%, respectively, relative to 4-NA. This outcome was caused by the increase in the effective diameter for adsorption when the nitro group was located at the 2-and 3-positions of the molecule. This significantly reduced their ability to enter into, and diffuse through, the pores of ZSM-5. These findings underpin the importance of choosing the correct substrate when using such materials for water purification.

Effect of high nitrate contamination of groundwater on human health and water quality index in semi-arid region, South India

“…Compared to other contaminants in groundwater, nitrate plays a vital role in groundwater quality aided with human health issues. The excess concentration of nitrate and continuous consumption of nitrate in groundwater causes serious health diseases on infant and different ages of peoples (Alardhi et al 2020a, Albayati and Doyle 2013Albayati et al 2020).…”

Recovery of fuel from real waste oily sludge via a new eco-friendly surfactant material used in a digital baffle batch extraction unit

“…The obtained water content data indicated the excellent water separation from oily sludge. The high sulphur content of the recovered fuel (2.032 wt%) indicated that the fuel needed further treatment before its used as a finished fuel 50 , 51 .…”

Removal of Aniline and Nitro-Substituted Aniline from Wastewater by Particulate Nanoporous MCM-48

“…This can be explained that a large number of vacant surface sites are available for the adsorption at the beginning. It was also suggested that a strong attractive force occurred between the aniline and it's substituted molecules and the sorbent, and with passage of time, the remaining vacant surface sites are difficult to be occupied due to saturation occurred, and this may also be due to the deficient in the number of available sorption sites at the end of the sorption process (Rabih et al 2007;Albayati and Doyle 2013).…”