The Effect of Proton and Arsenic Concentration on As(III) Removal by Hematite and Kaolin Complexes

Abstract

With the intensification of human activities, arsenite (As(III)) pollutant from the soil and ground water has been a threat to human health, and the problem gradually becomes the focus of attention. In this study, the effects of several environment factors on As(III) removal ability of complex minerals are determined through the analysis of mineralogical characteristics of the complex synthesis of hematite and kaolin, using X-ray diffraction, Fourier transform infrared, and specific surface area. In the results, the XRD patterns of hematite and kaolin complexes indicate that the loading covers up some characteristic peaks of minerals in kaolin, which can be that hematite loading decrease the order of structure for some minerals. With increasing Fe content, the hydroxyl sites gradually increase, therefore strengthening the As(III) removal ability of complexes. With increasing the As(III) concentration, the removal ratios of kaolin on As(III) almost keep unchanged and that of complexes show no obvious regularity. However, with the pH increasing, the removal ratios of all samples keep increasing. Furthermore, the increasing of As(III) concentration and pH both improve As(III) removal amount significantly, especially for As(III) concentration. In addition, there is no forming of new mineral through it as observed by XRD. Therefore, hematite loading can promote the As(III) removal on kaolin through adsorption in different environments, which can provide a better method for the remediation of arsenic pollution.

Natural Clay Minerals as Potential Arsenic Sorbents from Contaminated Groundwater: Equilibrium and Kinetic Studies

“…The peak value at 910 is attributed to the Al-OH bond stretching, as Maiti et al [ 39 ] reported 912 cm −1 for this group. Moreover, the bands at 534 and 465 cm −1 in kaolinite can be ascribed to the vibration of Si-O-Al/Fe, Si-O-Si and Al-O, as the range of 573 and 473cm −1 has been studied in previous studies [ 93 ]. The specific peak at 534 is attributed to the Al-O bending vibration [ 94 ].…”

Enhanced Adsorptive Removal of Chromium (VI) from Aqueous Solution on Using Aged Refuse: Resource Recovery and Environmental Applications

“…The composition of the aged refuse is inclusive of 4.53% organic content with a particle size of 0.2 to 1 mm, while the organic content sized below 0.2 mm is 5.69% [13]. To better understand the significance of these naturally occurring complex minerals, the characteristics of the hematite loaded on kaolin clay complexes were examined earlier (Shuai [16]). Various authors proposed to make a fair use of adsorbents to get rid of most of the metals in water.…”