Chromium sorption on synthetic and natural rock minerals with emphasis on speciation behavior and kinetic model using Cr51
Affiliation:
1. Analytical Chemistry Department , Egyptian Atomic Energy Authority, Hot Lab Center , Cairo , 13759 , Egypt
Abstract
Abstract
The presence of chromate in the aquatic environment poses toxicity and pollution to the environment. Therefore, the needs to establish methods to get rid of this species is a must. The effect of different natural rock minerals; pyrite, magnetite, pyrrhotite, and wurtzite as constituent parts of the Earth’s crust can play a major role in waste treatment. The properties of those minerals towards the behavior of chromium (sorption) were studied under the effect of changes of pH and contact time to treat the waste solution of toxic chromate. The total chromium species in the reaction system was determined using Cr51 as a simpler, faster and more accurate analytical tools. Concerning the effect of types of minerals, the synthetic ones, the results indicated that pyrrhotite and wurtzite were highly effective for the removal of chromate with almost 100 % sorption capacity as it was pH-independent, despite the presence of a degree of reductive ability of both minerals. While, it was 99 % at pH 8.5 and 28 % at pH 3 for pyrite and magnetite, respectively, which was pH dependent. The equilibrium adsorption capacities for chromium adsorption were 0.34 ± 0.15, 0.028 ± 0.01 and 4.27 ± 1.3 mg/g mineral for natural minerals pyrite, magnetite and synthetic one pyrhotite, respectively. However, it was found 117.7 ± 10.9 mg/g for synthetic mineral wurtzite. These results can be attributed to the redox power of oxide and sulfide minerals; magnetite and, pyrite used. For kinetic studies of chromium (VI) adsorption, non linear model approved that the reaction could be described based on pseudo-second-order kinetics in such simulated environmental heterogeneous systems.
Publisher
Walter de Gruyter GmbH
Reference39 articles.
1. Islam, M. M., Mohana, A. A., Rahman, M. A., Rahman, M., Naidu, R., Rahman, M. M. A comprehensive review of the current progress of chromium removal methods from aqueous solution. Toxics 2023, 11, 252. https://doi.org/10.3390/toxics11030252. 2. Karimi-Maleh, H., Ayati, A., Ghanbari, S., Orooji, Y., Tanhaei, B., Karimi, F., Alizadeh, M., Rouhi, J., Fu, L., Sillanpää, M. Recent advances in removal techniques of Cr(VI) toxic ion from aqueous solution: a comprehensive review. J. Mol. Liq. 2021, 329, 115062–115077; https://doi.org/10.1016/j.molliq.2020.115062. 3. Truex, M. J., Szecsody, J. E., Qafoku, N. P., Sahajpal, R., Zhong, L., Lawter, A. R., Lee, B. D. Assessment of hexavalent chromium natural attenuation for the Hanford site 100 area. Prepared for the U.S Department of Energy under Contract DE-AC05-76RL01830 Pacific Northwest, 2015. 4. Byrne1, P., Taylor, K. G., Hudson-Edwards, K. A., Barrett, J. E. S. Speciation and potential long-term behaviour of chromiumin urban sediment particulates. J. Soils Sediments 2016, 17, 2666–2676; https://doi.org/10.1007/s11368-016-1558-3. 5. Mpouras, T., Chrysochoou, M., Dermatas, D. Investigation of hexavalent chromium sorption in serpentine sediments. J. Contam. Hydrol. 2016, 197, 29–38; https://doi.org/10.1016/j.jconhyd.12.009.
|
|