Bead-Shaped Mesoporous Alumina Adsorbents for Adsorption of Ammonia.

Jiyull Kim,Huyen Thanh Vo,Sejin Jang,Ji Bong Joo,Nayeon Kim,Hyeonkyeong Lee,Gwoungwoo Lee

doi:10.3390/ma13061375

Abstract

It is of great importance to remove toxic gases by efficient methods for recovering the atmosphere to safe levels. The adsorption of the toxic gas molecules on solid adsorbents is one of the most useful techniques because of its simple operation and economic feasibility. Here, we report the uniform Bead-Shaped Mesoporous Alumina (BSMA) with tunable particle size for use as an adsorbent for removal of toxic ammonia. The BSMA particles with tunable diameters were synthesized by means of a sol–gel reaction of Al(NO3)3∙9H2O as an alumina precursor in the presence of chitosan as a template. When the ammonia solution is added dropwise to the prepared viscose mixture containing chitosan, acetic acid, and the alumina precursor solution, the sol–gel condensation reaction of the alumina precursor occurs in the chitosan polymer metrics, resulting in bead-shaped chitosan-aluminum hydroxide particles. Then, final Bead-Shaped Mesoporous Alumina (BSMA) particles are obtained by calcination at a high temperature. During the synthesis, changing the mole ratio of the chitosan template to the alumina precursor allowed the particle diameter of the final bead sample to be finely controlled. In addition, the prepared BSMA particles have well-developed mesoporous characteristics with relatively large surface areas, which are beneficial for adsorption of gas molecules. In an ammonia adsorption experiment, the BSMA-1.5 sample, which has the smallest particle diameter among the bead samples, was the best in terms of adsorption capacity. In this manuscript, we systemically discuss the relationship between the characteristics of BSMA samples and their adsorption of ammonia.

Highlights

There has been increasing attention to the management of atmospheric quality, which can cause severe respiratory health problems for the human body and, occasionally, lead to death, when the atmosphere is significantly polluted by harmful gases [1,2,3]
We report on the synthesis of Bead-Shaped Mesoporous Alumina (BSMA) for use as an efficient adsorbent for the removal of ammonia gas
Bead-Shaped Mesoporous Alumina (BSMA) was synthesized by a biopolymer template-assisted sol–gel reaction of alumina precursor followed by sequential calcination at 600 ◦ C (Figure 1) [26,27,28]

Summary

Introduction

There has been increasing attention to the management of atmospheric quality, which can cause severe respiratory health problems for the human body and, occasionally, lead to death, when the atmosphere is significantly polluted by harmful gases [1,2,3]. There have been many harmful gases either leaked or exhausted from chemical industries, such as carbon monoxide, hydrogen sulfide, hydrogen chloride, chlorine, phosphine, nitrogen oxide, and ammonia, which should, be kept to safe levels [6,7,8,9,10]. Ammonia (NH3 ) is one of the most widely produced inorganic compounds in chemical industries It is one of the most useful chemicals in modern society, since it can be used as a fertilizer, precursor to nitrogenous compound, cleaner, fuel, etc [11]. It can become a threatening gas that pollutes the atmosphere when too much of it is suddenly exhausted Since it is colorless, pungent, and corrosive, it can cause fatal damage to humans and animals exposed to it.

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Results

Conclusion