Study on Removal Efficiency of Ammonia onto Modified Activated Carbon

• Main Authors: Hong-Song Li, 李鴻松
• Other Authors: Chen-Chia Huang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/10652095972609431646

碩士 === 國立雲林科技大學 === 工業化學與災害防治研究所 === 94 === The aim of this thesis is to investigate the removal efficiency of dilute ammonia gas by coconut shell based carbons (ACs) which were modified by different kinds of acids and metal compounds. The physical and chemical properties of the ACs were measured by the following methods. The functional groups on the surface of the ACs were determined by a Fourier transform infrared spectrograph (FTIR). The surface structure of the ACs was observed by a scanning electron microscopy (SEM). The specific surface area and pore volume of the ACs were measured by a gas adsorption apparatus. A dynamic adsorption system was designed to measure adsorption capacity of ammonia gas onto the virgin ACs and the modified ACs. The concentration of ammonia in the effluent stream was analyzed by a gas-detecting tube technique at room temperature. Experimental results showed that the removal efficiency of ammonia gas of the modified ACs was all improved. The removal efficiency of the 12N nitric acid-modified ACs had the largest one, which promoted 17 times. It is found that the adsorption amount of ammonia is directly proportional to the amount of acidic oxygen functional groups of the ACs. In addition, the adsorption capacity of the ACs modified by 1N cobalt nitrate promoted 15 times. The FTIR spectra of the ACs showed that there was a peak exhibited at 1399cm-1 after the ACs adsorbed ammonia. This attributed to NH3 interacted with the acidic oxygen groups of the ACs to form NH4+ absorbed as the Br�幯sted acid site of the ACs surfaces.