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A Review on the Recent Studies for Chromium Species Adsorption on Raw and Modified Natural Minerals

Industrial effluents and human activity pose an imminent danger on the environment. Nowadays, one of the major challenges of scientists is the environmental protection and the prevention of health hazards occurring from heavy metal contamination. Hexavalent chromium has been proven to be one of the most toxic metals in waters and wastewaters. The authors summarize the theoretical aspects concerning chromium removal using adsorption and ion exchange processes, and present a review of the experimental research published on the subject through the last decade. The review is narrowed down to methods utilizing low-cost natural and modified mineral sorbents.