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Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.


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TL;DR: The ecotoxicological assessment of the leachates and low cost removal technology are discussed in this paper and it is suggested that the characterization of suitable, and exhausted sorbent through the application of fourier transformed infrared spectroscopy, X-ray diffraction, andX-ray fluorescence is essential to establish its surface bonding.
Abstract: Various options are applicable for the removal of water pollutants included reverse osmosis, ion exchange, coagulation, co-precipitation, catalytic reduction, herbal filtration, electrodialysis and adsorption. This paper deals with the sorption phenomena for the removal of pollutants from drinking water. Attempts have been made to use low cost sorbents developed by pretreatment/activation/impregnation with alkalis, acids, iron oxide, manganese dioxide, ferric chloride, alum, lime, aluminum salts with natural products/indigenous minerals viz. activated alumina, activated carbon, groundnut husk, saw dust, chemically coated sand, fly ash, zeolites, clay minerals and other plant products. Application of Freundich and Langmuir isotherms were used to assess the adsorption capacity. Equilibrium isotherms were determined at optimum temperature and pH to characterize the sorption process. Statistical parameters such as mass transfer coefficients, multiple regression analysis were applied to establish the mechanism. It is suggested that the characterization of suitable, and exhausted sorbent through the application of fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray fluorescence (XRF) is essential to establish its surface bonding. Scope for safety evaluation and risk assessment to human and biosphere may provide the guideline and predication to the regulatory agencies for its sustainable use and safe disposal The ecotoxicological assessment of the leachates and low cost removal technology are discussed in this paper.

26 citations

Journal Article
TL;DR: The results indicate that the adsorption process is favored at pH 9.5, which is close to the optimum conditions for the best adsorbent formation.
Abstract: Removal of nickel ions from industrial effluents has been studied using activated alumina prepared by the galvanic oxidation of aluminum metal at ambient temperature as the adsorbent. The effect of various factors, such as initial concentration of nickel, contact time, dose of adsorbent and pH of the solution has been investigated. Batch and column type of adsorption studies have been made. The results indicate that the adsorption process is favored at pH 9. The adsorption data were fitted with suitable adsorption isotherm. The optimum conditions for the best adsorption have been evaluated for the following factors: dosage, contact time, pH, initial concentration of nickel ions and temperature. The process of regeneration of the adsorbent has also been studied.

25 citations

Journal ArticleDOI
TL;DR: In this article, the effect of initial concentration and contact time on arsenic and fluoride removal from groundwater was studied using anjili tree sawdust chemically modified by Ferric hydroxide and Activated Alumina (SFAA).

25 citations

Journal ArticleDOI
TL;DR: Crystalline Mn3O4 was an effective and viable sorbent for removal of arsenic (V) from natural water, removing greater than 95% of arsenic from a 1 mg L−1 solution within 60 min of contact time.
Abstract: Manganese (II,III) oxide (Mn3O4) crystalline powder was evaluated as a potential sorbent for removal of arsenic (V) from water. Adsorption isotherm experiments were carried out to determine the adsorption capacity using de-ionized (DI) water, a synthetic solution containing bicarbonate alkalinity, and two natual groundwater samples. Adsorption isotherm data followed the Langmuir and Freundlich equations, indicating favorable adsorption of arsenic (V) onto Mn3O4, while results from the Dubinin–Radushkevich equation were suggestive of chemisorption of arsenic (V). When normalized to the sorbent surface area, the maximum adsorption capacity of Mn3O4 for arsenic (V) was 101 μg m−2, comparable to that of activated alumina. Arsenic (V) adsorption onto Mn3O4 followed pseudo–second-order kinetics. Adsorption of arsenic (V) was greatest at pH 2, while adsorption at pH 7–9 was within 91% of maximum adsorption, whereas adsorption decreased to 32% of maximum adsorption at pH 10. Surface charge analysis confirmed the ...

25 citations

Journal ArticleDOI
TL;DR: A method of matrix elimination has been developed that facilitates the determination of analytes such as arsenic, chromium, selenium and vanadium in biological matrices by inductively coupled plasma mass spectrometry (ICP-MS) without interference from polyatomic ions as mentioned in this paper.
Abstract: A method of matrix elimination has been developed that facilitates the determination of analytes such as arsenic, chromium, selenium and vanadium in biological matrices by inductively coupled plasma mass spectrometry (ICP-MS) without interference from polyatomic ions. The method involves the retention of the analytes as anions on activated alumina (acidic form) in a microcolumn using an on-line flow injection system, with simultaneous matrix removal. Analysis of certified reference materials [NIES (National Institute of Environmental Studies) 9 Sargasso, Tort-1 Lobster Hepatopancreas, Dorm-1 Dogfish Reference Muscle and Dolt-1 Dogfish Liver Tissue] yielded results in good agreement with the certified values, although a photolysis step was used for determinations of arsenic in animal based samples in order to destroy organoarsenic compounds. Tests showed close to 100% recovery for all analytes. The limits of detection (3σn–1) using a 200 µl sample loop were 1.2, 6.0, 9.0 and 65 ng ml–1 for vanadium, chromium, arsenic and selenium, respectively. A preconcentration system was developed for selenium because of the relative insensitivity of ICP-MS to this element. This yielded a detection limit of 1.0 ng ml–1 at m/z 78.

25 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202218
202118
202031
201941
201839