Removal of Cr(III) from tannery wastewater by adsorption onto bentonite clay

Autor:	S.S. Tahir, R. Naseem
Rok vydání:	2007
Předmět:	Langmuir Chromatography chemistry.chemical_element Filtration and Separation Sulfuric acid Analytical Chemistry law.invention Chromium chemistry.chemical_compound Adsorption chemistry Wastewater law Bentonite Freundlich equation Atomic absorption spectroscopy Nuclear chemistry
Zdroj:	Separation and Purification Technology. 53:312-321
ISSN:	1383-5866
DOI:	10.1016/j.seppur.2006.08.008
Popis:	In this study adsorption technique was applied for the successful removal of Cr(III) from tannery wastewater. For this purpose wastewater samples were collected from 18 tanneries to know the actual concentration of Cr(III) present in the influent (chrome tanning stage) and the combined wastewater. Maximum of 93% adsorption has been achieved on pre-treated (with sludge) wastewater samples with a shaking time of 15 min, while 76% is achieved in case of untreated samples with a shaking time of 45 min at a pH of 2.4–2.5. The process of uptake follows both the Langmuir and Freundlich isotherm models. Thermodynamic parameters such as Δ H °, Δ S ° and Δ G ° were calculated from the slope and intercept of the linear plot of ln K D against 1/ T . Column studies have also been carried out using a certain concentration of wastewater. More than 99% recovery has been achieved by using 5 g of the bentonite with 3 M sulfuric acid solutions. Atomic absorption spectrophotometer was applied to determine the concentration of Cr(III) before and after adsorption.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::30ff490b57acc71c1ab834ad28126ae9 https://doi.org/10.1016/j.seppur.2006.08.008 Zobrazit plný text záznamu Full Text from ScienceDirect