Removing of the Sulfur Compounds by Impregnated Polypropylene Fibers with Silver Nanoparticles-Cellulose Derivatives for Air Odor Correction

Abstract

The unpleasant odor that appears in the industrial and adjacent waste processing areas is a permanent concern for the protection of the environment and, especially, for the quality of life. Among the many variants for removing substance traces, which give an unpleasant smell to the air, membrane-based methods or techniques are viable options. Their advantages consist of installation simplicity and scaling possibility, selectivity; moreover, the flows of odorous substances are direct, automation is complete by accessible operating parameters (pH, temperature, ionic strength), and the operation costs are low. The paper presents the process of obtaining membranes from cellulosic derivatives containing silver nanoparticles, using accessible raw materials (namely motion picture films from abandoned archives). The technique used for membrane preparation was the immersion precipitation for phase inversion of cellulosic polymer solutions in methylene chloride: methanol, 2:1 volume. The membranes obtained were morphologically and structurally characterized by scanning electron microscopy (SEM) and high resolution SEM (HR SEM), energy dispersive X-ray analysis (EDAX), Fourier transform infrared spectrometry (FTIR), thermal analysis (TG, ATD). Then, the membrane performance process (extraction efficiency and species flux) was determined using hydrogen sulfide (H2S) and ethanethiol (C2H5SH) as target substances.

Accessible Silver-Iron Oxide Nanoparticles as a Nanomaterial for Supported Liquid Membranes

“…The pertraction mechanism of nitrophenols separation through supported liquid membranes is well-known [ 56 , 57 , 58 , 59 ]. It implies the existence of a pH gradient between the source and the receiving phase (see Figure S7 ).…”

“…The packing procedure of polypropylene hollow fibers in a bundle ( Figure 1 a) allows the achievement of the desired separation surface, in our case 1.0 m 2 , and the easy realization of the scaling by inserting several fascicles in flexible permeation modules [ 56 ]. The details ( Figure 1 b) presented to show the pore dimensions evenly distributed in the membrane fiber section ( Figure 1 c).…”

“…The details ( Figure 1 b) presented to show the pore dimensions evenly distributed in the membrane fiber section ( Figure 1 c). The highlighted characteristics allow the impregnation of polypropylene hollow fibers with solutions or dispersions of nanoparticles [ 55 , 56 , 57 ].…”

“…The bundle of microporous polypropylene fibers was immersed in the obtained dispersion without inserting the sealing ends (made of polyvinyl chloride). After 24 h, the bundle of polypropylene fibers impregnated with nanoparticles containing iron oxide and silver in the considered n-alcohol is recovered and washed for 10 minutes with deionized water—see Figure S1 in Supplementary Materials [ 56 , 57 ].…”

Improving the Performance of Composite Hollow Fiber Membranes with Magnetic Field Generated Convection Application on pH Correction

“…Starting from these landmarks, membranes and membrane processes have succeeded due to flow performance, low costs with chemical reagents and the easy scaling up the of the unpleasant smell of the premises [18][19][20][21][22].…”