scholarly journals Simultaneous Removal of Al, Cu and Zn Ions from Aqueous Solutions Using Ion and Precipitate Flotation Methods

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 301
Author(s):  
Piotr Rybarczyk ◽  
Bożenna Kawalec-Pietrenko
Keyword(s):  
Aqueous Solutions ◽  
Ph Value ◽  
Metal Salts ◽  
Simultaneous Removal ◽  
Gas Velocity ◽  
Solution Ph ◽  
Dilute Aqueous Solutions ◽  
Surface Active ◽  
Zn Ions ◽  
Collector Concentration

This paper presents the results of investigations concerning the simultaneous removal of Al(III), Cu(II), and Zn(II) from dilute aqueous solutions using ion and precipitate flotation methods. The effects of initial solution pH, surface active substance concentration, and the gas velocity on the flotations’ efficiency and course are studied. Experimental results are discussed in terms of physicochemical aspects related to aqueous solutions of metal salts. The results indicate that satisfying simultaneous flotations of aluminum, copper and zinc species are observed if the pH value ranges between 7.0 and 9.0. It was found that an increase in collector concentration results in a decrease in the flotation rate constants. An increase in the gas velocity results in an increase in the ion and precipitate flotation rates.

pH triggered self-assembly structural transition of ionic liquids in aqueous solutions: smart use of pH-responsive additives

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65583-65590 ◽  
Author(s):  
Huiyong Wang ◽  
Bo Tan ◽  
Hucheng Zhang ◽  
Jianji Wang
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Self Assembly ◽  
Structural Transition ◽  
Ph Value ◽  
Ph Responsive ◽  
Single Chain ◽  
Solution Ph ◽  
Spherical Micelles

The pH responsive fluids consisting of single-chain ionic liquid surfactants [Cnmim]Br (n = 12, 14) and hydrotropes can reversibly transform from spherical micelles to vesicles then to spherical micelles again with the change of the solution pH value.

scholarly journals Adsorption of Pb2+ ions from aqueous solutions by gelatin/activated carbon composite bead form

2017 ◽  
Vol 36 (1-2) ◽  
pp. 355-371 ◽  
Author(s):  
Fareeda Hayeeye ◽  
Qiming J Yu ◽  
Memoon Sattar ◽  
Watchanida Chinpa ◽  
Orawan Sirichote
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Carbon Composite ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Composite Bead

Gelatin and activated carbon materials have been combined together to obtain a gelatin/activated carbon composite bead form which is ecofriendly, nontoxic, biocompatible, and inexpensive material. In this paper, gelatin/activated carbon adsorption for Pb2+ ions from aqueous solutions was studied experimentally under various conditions. The experimental conditions such as contact time, solution pH, and gelatin/activated carbon dosage were examined and evaluated by using batch adsorption experiments. The maximum adsorption capacity of gelatin/activated carbon for Pb2+ ions was obtained to be 370.37 mg g−1. This maximum capacity was comparable with that of commercial ion exchange resins and it was much higher than those of natural zeolites. The uptake process for Pb2+ ions was found to be relatively fast with 92.15% of the adsorption completed in about 5 min in batch conditions. The adsorption capacity was also strongly solution pH dependent. Adsorption was observed at pH value as low as 2.0 and maximum adsorption was achieved at a pH of approximately 5. The results indicated that the gelatin/activated carbon was effective to be used as an adsorbent for Pb2+ ions removal in wastewater treatment.

Adsorption of Mn2+ Ion in Groundwater with Modified Bentonite

2012 ◽  
Vol 550-553 ◽  
pp. 2174-2177
Author(s):  
Chun Hua Liu ◽  
Chang Bin Xia
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Adsorption Process ◽  
Ph Value ◽  
Surface Complex ◽  
Solution Ph ◽  
Modified Bentonite ◽  
Higher Temperature ◽  
Adsorption Capability ◽  
Main Factor

The adsorption of Mn2+ion on natural bentonite heated-treated at 110 °C or 200 °C and on acid-treated with H2SO4from aqueous solutions has been investigated under different conditions,such as intial solution pH and initial Mn2+ion concentration.The results show that modified bentonite has a better adsorption capability,and the pH value is the main factor affecting adsorption;bentonite modified at higher temperature has the largest adsorption capability.The adsorption process in solution exhibits Langmuir behaviour and ion exchange and surface complex are chief adsorption form.

The reactions of oligoalcohols with arsenic, arsenous, boric and germanic acids

1980 ◽  
Vol 45 (10) ◽  
pp. 2645-2655 ◽  
Author(s):  
Antonín Mikan ◽  
Miloš Bartušek
Keyword(s):  
Aqueous Solutions ◽  
Equilibrium Constants ◽  
Dilute Aqueous Solutions

The reactions of sorbitol, mannitol, adonitol, dulcitol, glucose and glycerol with H3AsO4, H3AsO3, H3BO3 and GeO2 acids in dilute aqueous solutions were studied by potentiometric neutralization titrations. The formation of the following chelates was demonstrated: As(V)L3-, As(III)L(OH)2-, HAs(III)L(OH)2, BL2-, GeL2(OH)- and GeL32- and the equilibrium constants for their formation were found. Conditions for formation of these chelates of organic oligohydroxy compounds are discussed.

Study of potential oscillations during reaction of an aluminium single crystal with an aqueous KOH solution

1990 ◽  
Vol 55 (2) ◽  
pp. 345-353 ◽  
Author(s):  
Ivan Halaša ◽  
Milica Miadoková
Keyword(s):  
Aqueous Solutions ◽  
Single Crystal ◽  
Single Crystals ◽  
Periodic Potential ◽  
Optimum Conditions ◽  
Potential Oscillations ◽  
Dilute Aqueous Solutions ◽  
Experimental Findings ◽  
Kinetics Of

The authors investigated periodic potential changes measured on oriented sections of Al single crystals during spontaneous dissolution in dilute aqueous solutions of KOH, with the aim to find optimum conditions for the formation of potential oscillations. It was found that this phenomenon is related with the kinetics of the reaction investigated, whose rate also changed periodically. The mechanism of the oscillations is discussed in view of the experimental findings.

scholarly journals Separation of Radionuclides from a Rare Earth-Containing Solution by Zeolite Adsorption

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 20
Author(s):  
Deniz Talan ◽  
Qingqing Huang
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Contact Time ◽  
Separation Efficiency ◽  
Ph Value ◽  
Solid Phase ◽  
Separation Performance ◽  
Solution Ph ◽  
Zeolite Sample ◽  
Alternative Sources

The increasing industrial demand for rare earths requires new or alternative sources to be found. Within this context, there have been studies validating the technical feasibility of coal and coal byproducts as alternative sources for rare earth elements. Nonetheless, radioactive materials, such as thorium and uranium, are frequently seen in the rare earths’ mineralization, and causes environmental and health concerns. Consequently, there exists an urgent need to remove these radionuclides in order to produce high purity rare earths to diversify the supply chain, as well as maintain an environmentally-favorable extraction process for the surroundings. In this study, an experimental design was generated to examine the effect of zeolite particle size, feed solution pH, zeolite amount, and contact time of solid and aqueous phases on the removal of thorium and uranium from the solution. The best separation performance was achieved using 2.50 g of 12-µm zeolite sample at a pH value of 3 with a contact time of 2 h. Under these conditions, the adsorption recovery of rare earths, thorium, and uranium into the solid phase was found to be 20.43 wt%, 99.20 wt%, and 89.60 wt%, respectively. The Freundlich adsorption isotherm was determined to be the best-fit model, and the adsorption mechanism of rare earths and thorium was identified as multilayer physisorption. Further, the separation efficiency was assessed using the response surface methodology based on the development of a statistically significant model.

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