Removal of cobalt(II) from aqueous solution by spent green tealeaves
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Removal of cobalt(II) from aqueous solution by spent green tealeaves Djillali Imessaoudene1 · Nabila Bensacia2 · Fatima Chenoufi2 Received: 4 February 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The removal of C o2+ in aqueous solution by spent green tealeaves (SGTL) was studied in batch conditions. The bio-sorbent was characterized by the infrared spectroscopy, Boehm’s titration and by pHpzc. The optimum pH value was found in the range of 4 to 6. The sorption was fast, obeyed the pseudo second order model, and favored at low temperature. The biosorption capacity recorded a rate of 83.52% using 0.25 g of SGTL. The isotherm followed the Langmuir model. The Co2+ bio-sorption is exothermic, reversible and favorable and that it was carried out by physic sorption with low activation energy. Keywords Bio-sorption · Tealeaves · Cobalt
Introduction The nuclear industry produces large quantities of radioactive effluents from very different sources and compositions. Cobalt is produced with relative abundance in nuclear reactors and is the main source of radioactivity of the waste effluent from these reactors. The presence of the latter in aqueous effluents represents a serious concern because it constitutes a radiological threat of bio-toxicity to organic matter due to his long half-live [1]. Also, human exposure to high concentrations of cobalt may cause erythropoietic effect, cardiomyopathy, hypothyroidism, polycythemia, sterility, hair loss, vomiting, bleeding, diarrhea, coma and even death [2, 3]. Different techniques have been used for the elimination of certain pollutants soluble in industrial or domestic effluents. They are different from each other and can be cited by way of illustration: electrolysis, flotation, precipitation, ion exchange, liquid–liquid extraction, membrane filtration adsorption [2–4]. Adsorption is considered an effective, inexpensive technique and alternative for these conventional techniques for concentrates treatment, especially, * Djillali Imessaoudene [email protected] 1
Centre de recherche nucléaire de Birine, BP180, 17000 Ain Oussera, Djelfa, Algeria
Laboratoire Génie Chimique, Département de Génie des Procédés, Faculté de Technologie, Université de Blida, 1, route de Soumaa, BP 270, 9000 Blida, Algeria
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when the sorbent does not require an additional pretreatment step before its application [5]. A number of organic waste and by-products were studied for removal or recovery trace metals from wastewaters and water supplies among others the cobalt(II): Cellulose and Sugarcane Bagasse [2], Triticum aestivum straw [4], Fungal Biomasses [6], Bark of Eucalyptus [7], Pennisetum glaucum [8], Paecilomyces catenlannulatus [9]. Tea is the most widely consumed beverage in the world next to water, because of its health benefits. Global production of green tea will reach the 3.6 million tons in 2027 [10]. There is a need to consider alternatives for the use of green tea waste. Bio-sorption is a potential economic approach to valorize this low cost and effective material. T
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