Joanna Fronczyk, Krzysztof Kuśmierek, Andrzej Świątkowski
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引用次数: 0
Abstract
The study investigated the adsorption capacity of natural minerals such as limestone sand (LS), silica spongolite (SS), chalcedonite (CH), and dolomite (DO) for the removal of a model contaminant, the azo dye Reactive Red 120 (RR-120). The effects of adsorbent dose and solution pH on adsorption, as well as the adsorption kinetics and equilibrium adsorption, were investigated. The results showed that adsorption was dependent on the mass of the adsorbent and increased with increasing adsorbent dose. Adsorption was also dependent on the pH of the initial solution and was most efficient in an acidic media. Adsorption kinetic research results revealed that the adsorption of RR-120 on all four minerals followed the pseudo-second-order model and was controlled by film diffusion. The dye adsorbed fastest on limestone sand (k2 = 0.021 g/µmol∙min) and slowest on dolomite (k2 = 0.015 g/µmol∙min). The observed adsorption rate increases in the order of DO < CH < SS < LS. Under equilibrium conditions, Reactive Red 120 was adsorbed best on dolomite and least on limestone sand (LS < SS < CH < DO). The Langmuir adsorption capacities for RR-120 were found to be 4.7 μmol/g for LS, 5.2 μmol/g for SS, 7.0 μmol/g for CH, and 9.0 μmol/g for DO. The results indicate that selected natural minerals can be employed as alternatives to commercial adsorbents for the removal of Reactive Red 120 from water.
期刊介绍：
Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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