Graphene oxide nanosheets in basic medium: a new potential adsorbent for microwave assisted cloud point extraction of beryllium from industrial effluents prior to ICP-OES determination

Abstract

A novel graphene oxide mediated microwave assisted cloud point extraction is developed in basic solution, for the extraction of ultra trace beryllium from natural water and plant waste water.

Novel Protic Ionic Liquid for Efficient Extraction of Beryllium with a New Sight of Mechanism

“…According to previous reports, the existing species of beryllium in aqueous solutions differ under acidic and basic conditions. 34 By varying the pH of the solution, beryllium species can convert from Be 2+ (under pH 4) to Be(OH) + (pH 5−8), from Be(OH) 2 precipitation (pH 7.5−9.5) to Be-(OH) 3 − (above pH 9.5). 35 The same tendency is applicable to other heavy metals.…”

Interference free ultratrace beryllium determination in alkaline effluents of beryllium processing plants by graphite furnace atomic absorption spectrometry after a novel graphene oxide-assisted dispersive micro solid phase extraction without using a chelating agent

“…At pH > 6, the predominant species of Be is Be(OH) 2(aq) (at < 1 mM of Be), which might be precipitated on GO sheets due to hydrophobic interactions, resulting in maximum recovery in the studied pH range (6)(7)(8)(9)(10)(11)(12). To separate Be from effluents, the pH of the samples was not adjusted because they are already in high alkaline condition, and the pH of other environmental water samples was adjusted to pH > 6, where GO is highly deprotonated and dispersed in the solution, resulting in fast sorption kinetics and higher sorption capacity.…”

“…This is evident from the zeta potential studies earlier conducted in our laboratory on GO. 6 The addition of an electrolye (NaCl) might decrease repulsion among the GO sheets via charge neutralization, fecilitating hydrophobic agglomaration. Hence, the effect of the NaCl concentration on the recovery of Be was studied in the range of 0-1% by keeping other parameters constant.…”

“…Furthermore, uoride in the effluents bleaches the formed colored complex of beryllium-chromeazurol S and interferences in the determination. 3 Different procedures have been reported for the preconcentration of beryllium from aqueous solutions, such as mixed micelle based cloud point extraction, [4][5][6] dispersive liquid-liquid microextraction 7 and coprecipitation. [8][9][10] Recently, our group reported vesicle-mediated dispersive liquid-liquid microextraction and nonionic micelle-based cloud point extraction methods for the determination of beryllium in seawater and environmental waters, respectively, using chelating agents.…”