Infrared Spectroscopic Study on the Modified Mechanism of Aluminum-Impregnated Bone Charcoal

Abstract

Fluoride contamination in drinking water is a prominent and widespread problem in many parts of the world. Excessive ingestion of fluoride through water can lead to the high risk of fluorosis in human body. Bone charcoal, with the principal active component of hydroxyapatite, is a frequently used adsorbent for fluoride removal. Many laboratory experiments suggest that the aluminum-impregnated bone charcoal is an effective adsorbent in defluoridation. However, the mechanisms underlying this modification process are still not well understood, which in turn greatly impedes the further studies on other different modified adsorbents. To address this issue, we used the infrared spectroscopy to examine the bone charcoal and the aluminum-impregnated bone charcoal, respectively. The comparative results show that the −OH peak of infrared spectroscopy has been intensified after modification. This significant change helped speculate the modified mechanism of the aluminum-impregnated bone charcoal. In addition, it is found that the hydroxide ion dissociates from hydroxyapatite in the modification process. Such finding implies that the tetrahydroxoaluminate can be combined with the hydroxyapatite and the aluminum ion can be impregnated onto the bone char surface.

Quantitative estimation of soil salinity by means of different modeling methods and visible-near infrared (VIS–NIR) spectroscopy, Ebinur Lake Wetland, Northwest China

“…Some less obvious absorption peak information was magnified. The strengthening of peak intensity in VIS–NIR was very important to the further exploration of its reflection mechanism ( Li et al, 2014 ). Compared with the conventional raw reflectance, FD, and SD, more spectral characteristics were refined of the spectrum reflectance treated by the pretreatment of fractional derivative, and are provided as Table S2 .…”

Infrared Spectroscopic Analysis of the Inorganic Deposits from Water in Domestic and Technical Heat Exchangers

“…Nevertheless, it should be noted that this is, of course, not the first study of inorganic materials using FTIR spectroscopy. Quite the contrary, FTIR is frequently used to characterize inorganic substances such as carbonates and silicates [9,10], metal-impregnated charcoal [11], minerals [12], and even functionalized ceramic membranes [13]. The novelty of the present work is the application of an FTIR method to the deposits from boilers and heat exchangers.…”

Characterization of pruned tea branch biochar and the mechanisms underlying its adsorption for cadmium in aqueous solution

“…Elemental mass percentage of TBB700 before and after Cd 2+ adsorption Creative Commons Attribution-NonCommercial 3.0 Unported Licence. from the results observed by Li et al, who observed that the intensity of the peak increased aer adsorption because of the dissociation of hydroxyl ions during anion exchange 53. The intensity of peaks at 1411 and 1064 cm À1 associated with CO 3 3À groups played an important role in the removal of Cd 2+ by precipitation 14,54.…”