The Further Chemistry of Ellagic Acid II. Ellagic Acid and Water-Soluble Ellagates as Metal Precipitants

Holzforschung ◽  
2002 ◽  
Vol 56 (1) ◽  
pp. 13-19 ◽  
Author(s):  
S.R. Przewloka ◽  
B.J. Shearer
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Ellagic Acid ◽  
Water Soluble ◽  
Soluble Salts ◽  
Dilute Aqueous Solutions

Summary Preparations of the previously unreported, water-soluble, tetraguanidinium, tetracholine and tetrakisbenzyltrimethylammonium ellagates are outlined. Ellagic acid and these water-soluble salts remove Mg2+, Ca2+ and Mn2+ ions from dilute aqueous solutions at pH greater than 7. The salts also remove Fe2+, Fe3+, Co2+ and Cu2+ between pH 3 and pH 6. At pH 1 the water-soluble ellagates underwent hydrolysis, resulting in the precipitation of free ellagic acid in preference to the formation of metal-ellagate complexes. These trends were also observed when mixtures of metal ions were applied.

Self-assembled systems of water soluble metal 8-hydroxyquinolates with surfactants and conjugated polyelectrolytes

2016 ◽  
Vol 18 (25) ◽  
pp. 16629-16640 ◽  
Author(s):  
Hugh D. Burrows ◽  
Telma Costa ◽  
M. Luisa Ramos ◽  
Artur J. M. Valente ◽  
Beverly Stewart ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Light Harvesting ◽  
Water Soluble ◽  
Conjugated Polyelectrolytes ◽  
Self Assembled

Self-assembled fluorescent systems with potential in sensing and light harvesting are formed by mixing 8-hydroxyquinoline-5-sulfonate, metal ions and cationic conjugated electrolytes in aqueous solutions.

Selective separation of heavy metal ions from dilute aqueous solutions by foams and micelles of surfactants

Soft Matter ◽  
2018 ◽  
Vol 14 (48) ◽  
pp. 9830-9837 ◽  
Author(s):  
Zhang Liu ◽  
Yaxun Fan ◽  
Yilin Wang
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Selective Separation ◽  
Mixed Surfactants ◽  
Single Chain ◽  
Dilute Aqueous Solutions

Selective separation of heavy metal ions from dilute aqueous solutions by foams and micelles of single-chain and gemini anionic mixed surfactants.

Über Hexaiodoplatinate(IV) M2PtI6 (M = K, Rb, Cs, NH4, Tl) Darstellungsverfahren, Eigenschaften und Kristallstrukturen / On Hexaiodoplatinates(IV) M2PtI6 (M = K, Rb, Cs, NH4, Tl) -Preparation, Properties and Structural Data

1983 ◽  
Vol 38 (8) ◽  
pp. 905-910 ◽  
Author(s):  
Gerhard Thiele ◽  
Christian Mrozek ◽  
Dieter Kämmerer ◽  
Kurt Wittmann
Keyword(s):  
Aqueous Solutions ◽  
Single Crystal ◽  
Structural Parameters ◽  
Structural Data ◽  
Structure Type ◽  
Water Soluble ◽  
Crystal Data ◽  
Soluble Salts ◽  
Concentrated Aqueous Solutions ◽  
Distorted Version

Crystals of hexaiodoplatinates(IV) M2PtIe (M = K, Rb, Cs, NH4, Tl) have been obtained by heating PtI4 or H2FtCl6 in highly concentrated aqueous solutions of MI in the presence of small amounts of HI and I2 in an ampoule for 24 h at 160 °C. The structural parameters were determined from single crystal data. In water less soluble compounds with M = Rb, Cs, NH4 show the cubic K2PtCl6 structure, whereas the easily water soluble salts with M = K, Tl both crystallize in a tetragonally distorted version of this structure type.

Chitosan-based Magnetic Composites - Efficient Adsorbents for Removal of Pb(II) and Cu(II) from Aqueous Mono and Bicomponent Solutions

2018 ◽  
Vol 69 (9) ◽  
pp. 2323-2330 ◽  
Author(s):  
Daniela C. Culita ◽  
Claudia Maria Simonescu ◽  
Rodica Elena Patescu ◽  
Nicolae Stanica
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Chemical Properties ◽  
Order Kinetic ◽  
Mass Ratio ◽  
Magnetic Adsorbent ◽  
Magnetic Composites ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Physical And Chemical

A series of three chitosan-based magnetic composites was prepared through a simple coprecipitation method. It was investigated the influence of mass ratio between chitosan and magnetite on the physical and chemical properties of the composites in order to establish the optimum conditions for obtaining a composite with good adsorption capacity for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions. It was found that the microspheres prepared using mass ratio chitosan / magnetite 1.25/1, having a saturation magnetization of 15 emu g--1, are the best to be used as adsorbent for the metal ions. The influence of different parameters such as initial pH values, contact time, initial concentration of metal ions, on the adsorption of Pb(II) and Cu(II) onto the chitosan-based magnetic adsorbent was investigated in details. The adsorption process fits the pseudo-second-order kinetic model in both mono and bicomponent systems, and the maximum adsorption capacities calculated on the basis of the Langmuir model were 79.4 mg g--1 for Pb(II) and 48.5 mg g--1 for Cu(II) in monocomponent systems, while in bicomponent systems were 88.3 and 49.5 mg g--1, respectively. The results revealed that the as prepared chitosan-based magnetic adsorbent can be an effective and promising adsorbent for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions.

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