Gislene S. Souza, Joane A. Alves, Emanuele P. Lima, Lucas M. S. Pimentel, Giulian C. S. Sá, Charlie G. Gomes, Emilly C. Silva, Sidnei C. Santos
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引用次数: 0
Abstract
Industrial growth and anthropogenic activities have resulted in the improper release of toxic substances, such as potentially hazardous metallic species into the soil and disrupting the trophic chain. To address this pressing issue, this research has focused on developing environmentally friendly methodologies for soil remediation. This study investigated the efficacy of rhamnolipid cell-free broth (RCFB), derived from the production by the bacterium Pseudomonas aeruginosa BM02, in removing Cd2+, Ni2+, and Cr2+ species from contaminated soil. Furthermore, there is the novelty of applying soil washing with unpurified biosurfactant, making the process much more economical and sustainable. The RCFB was optimized using a central composite design (CCD) with a 24 × 2 factorial arrangement, evaluating independent variables such as concentration of magnesium sulfate, ammonium sulfate, and andiroba (Carapa guianensis Aublet) biomass waste, along with incubation time. Characterization of the functional groups and surfactant properties of RCFB was conducted, and the theoretical maximum adsorption capacities of RCFB for Cd2+, Ni2+, and Cr2+ were 149.2 ± 0.10 mg/Kg, 120.1 ± 0.14 mg/Kg and 118.13 ± 0.12 mg/Kg, respectively. The removal process followed in accordance with the pseudo first order model and, according to the observed data, a satisfactory fit of the adsorption results to the Langmuir model was obtained for all metal ions. These findings suggest that RCFB can be used as a promising chelating eluent for bioremediation of contaminated soils by metallic species. This research is innovative due to the sustainable, economical and rapid process of obtaining the biosurfactant, emerging as an ecological alternative to chemical surfactants, which can be toxic and persistent in the environment. In addition, the application of free broth avoids the use of toxic solvents associated with the extraction and purification process of the biosurfactant, making it a more sustainable and economical choice.
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.
Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation.
Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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