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

Aurelia Cristina Nechifor,Paul Constantin Albu,Alexandra Raluca Grosu,Simona Cotorcea,Gheorghe Nechifor,Constantin Bungău,Ovidiu Oprea,Dumitru Pașcu,Andreia Pîrțac

doi:10.3390/membranes11040256

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.

Highlights

If we focus on membrane processes, it can be stated that the membrane is a window of a multi-component system (Figure 2), with selective permeability for chemical species of the system
We aimed to study the removal of hydrogen sulfide or ethanethiol through/with the help of membranes obtained from cellulosic derivatives containing silver nanoparticles, using accessible raw material
The experiments performed for the removal of hydrogen sulfide and ethanethiol from synthetic source phases started from the results reported in specialty literature regarding the influence of the pH of the source and receptor phases on the membrane system [70,71,72,73], establishing a pH = 5 for the source phase and a pH = 12 for the receiving phase

Summary

Introduction

Preventing and combating air pollution has led to the imperative need to develop and implement effective measures on a large scale, including [4,5,6,7]: . Relocation of polluting production units outside the localities; Giving up to polluting technologies; Improving production processes; 4.0/). In many economically advanced countries polluting production processes have been abandoned, and many of the necessary materials (obtained through polluting technologies) are imported (i.e., chemical and metallurgical products, leather and textiles, construction materials, and often even processed food and energy) [8,9,10]. Despite the progress made, complex equipment, installations, and production units with high impact on air quality remained in operation and are common [11]

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