A thermal analysis study of dithizone and dithizonates of mercury, silver and bismuth

Chahud, Marisa; Filho, Marco Aurélio da Silva Carvalho; Fernandes, Nedja Suely; Ionashiro, Massao

doi:10.1590/s0100-46702000000100001

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…The most intensive characteristic line of Fe 3 O 4 at 37.5 (Fig. 3c) was also properly overlapped by the diffraction band of activated carbon [32,33]. The small peak at 60 was referred to Fe 3 O 4 .…”

Section: Characterization Of the Adsorbentmentioning

confidence: 65%

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A novel magnetic biosorbent prepared using an oak shell waste material as an efficient adsorbent for consecutive removal of Pb2+, Ag+, Ba2+, Sr2+, and CrO42− from aqueous solutions

Adibmehr

Faghihian

2018

Comptes Rendus. Chimie

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In this research, the performance of a new biosorbent prepared using low-cost oak shell waste materials for consecutive removal of particular cations and chromate anions from aqueous solutions was studied. The adsorbent impregnated with Pb 2þ , Ag þ , Ba 2þ , and Sr 2þ was used to remove chromate anions by the formation of an appropriate insoluble precipitate. The biosorbent was characterized by FTIR, XRD, SEM, TG-DTG, and VSM techniques. The adsorption capacities of 133.84, 53.12, 50.12, and 40.39 mg g À1 were obtained for chromate for the samples containing Pb 2þ , Ag þ , Ba 2þ , and Sr 2þ cations, respectively. The chromate uptake was inversely proportional to the k sp of the chromate precipitate and increased with the cation content of the adsorbent. The adsorption process was kinetically fast and the equilibrium was established within 10 min. The experimental data were analyzed by the Langmuir, Freundlich, Sips, and Redlich-Peterson isotherm models. The data were fitted to the Langmuir isotherm, indicating that chromate was adsorbed homogeneously on the adsorbent surface.

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Section: Characterization Of the Adsorbentmentioning

confidence: 65%

“…The second weight loss step occurred between 300 and 420 C and corresponded to the dehydration of hydroxyl groups and decomposition of the remaining organic constituents such as lignocellulosic [35]. The final weight loss step occurred above 600 C and mainly involved the destruction of the dithizone structure [32].…”

Section: Characterization Of the Adsorbentmentioning

confidence: 99%