Spectroscopic and Mineralogical Characterization of Bentonite Clay (Ghardaïa, Algeria) for Heavy Metals Removal in Aqueous Solutions

2019 ◽  
Vol 14 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Souad Athman ◽  
Ali Sdiri ◽  
Makhlouf Boufatit
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Bentonite Clay ◽  
Mineralogical Characterization ◽  
Heavy Metals Removal ◽  
Metals Removal

scholarly journals Diatoms and Their Capability for Heavy Metals Removal by Cationic Exchange

2017 ◽  
Author(s):  
Juan Hernández-Ávila ◽  
Eleazar Salinas-Rodríguez ◽  
Eduardo Cerecedo-Sáenz ◽  
Ma. Isabel Reyes-Valderrama ◽  
Alberto Arenas-Flores ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Chemical Composition ◽  
The Other ◽  
Mineralogical Characterization ◽  
Heavy Metals Removal ◽  
Chromium Vi ◽  
Other Hand ◽  
Metals Removal ◽  
Cationic Exchange

This work shows the physicochemical and mineralogical characterization of diatomites form the Hidalgo and Jalisco States, Mexico. In the case of the mineral from Hidalgo State, this has the following chemical composition; 70.0 % wt. SiO2, 11.63 wt. % Al2O3, 1.95 wt. % FeO, 1.79 wt. % MgO, 2.41 wt. % K2O, 0.85 wt. % CaO and 6.10 wt. % Na2O. On the other hand, the mineral from Jalisco has the following chemical composition; 93.58 wt. % SiO2, 3.03 wt. % Al2O3, 1.81 wt. % FeO, 0.40 wt. % MgO, 0.92 wt. % K2O, 0.11 wt. % CaO and 0.24 wt. % Na2O. For recovery of metals, both minerals got arsenic, silver, lead and nickel recoveries upper to 95 % and lower to 10 % for chromium. According to efficiency of interchange, the mineral from Hidalgo is slightly higher in the case of arsenic, lead and silver; while for nickel and particularly chromium (VI) the efficiency is higher for the mineral from Jalisco.

A green, porous and eco-friendly magnetic geopolymer adsorbent for heavy metals removal from aqueous solutions

2019 ◽  
Vol 215 ◽  
pp. 1233-1245 ◽  
Author(s):  
Ali Maleki ◽  
Zoleikha Hajizadeh ◽  
Vajiheh Sharifi ◽  
Zeynab Emdadi
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Heavy Metals Removal ◽  
Metals Removal

Synthesis and characterization of magnetic zinc-copper ferrites: Antibacterial activity, photodegradation study and heavy metals removal evaluation

2019 ◽  
Vol 236 ◽  
pp. 121808 ◽  
Author(s):  
Mónica Araceli Camacho-González ◽  
Maribel Quezada-Cruz ◽  
Genaro Iván Cerón-Montes ◽  
María Fernanda Ramírez-Ayala ◽  
Leticia Esperanza Hernández-Cruz ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Antibacterial Activity ◽  
Synthesis And Characterization ◽  
Heavy Metals Removal ◽  
Metals Removal

Heavy metal removal from waste waters by phosphonate metal organic frameworks

2018 ◽  
Vol 90 (1) ◽  
pp. 35-47 ◽  
Author(s):  
Bianca Maranescu ◽  
Lavinia Lupa ◽  
Aurelia Visa
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Phosphonic Acid ◽  
Metal Organic Frameworks ◽  
Waste Waters ◽  
Heavy Metals Removal ◽  
Metals Removal ◽  
Metal Organic

AbstractThe increase attention in the area of phosphonate metal organic framework is exemplified with a variety of applications and a rich chemistry of these compounds. Water pollution caused by heavy metal ions is a major concern due to their toxicity to many life forms. In order to decrease the heavy metals impact upon the environment various technologies of water treatment such as: chemical sedimentation, ion exchange, redox process are studied. The tendency is to find a versatile and economical method of heavy metals removal from waste waters. Phosphonate metal organic frameworks were obtained by the reaction of Ni(CH3COO)2·4H2O, phosphonic acid (phosphonoacetic (CP), vinyl phosphonic acid (VP) and N,N-bis(phosphonomethyl)glycine (Gly)) in hydrothermal conditions. Coordination polymers synthesized were characterized by FTIR, XRD, scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The adsorption processes represent a very good alternative for heavy metals removal due to low costs and ease of operation. In the present paper the adsorption performance of the mentioned materials in the removal process of heavy metals from aqueous solutions, was studied using the batch method. The adsorption conditions were investigated by varying the initial pH, contact time and adsorbate initial concentration for chromium metal ions removal from aqueous solutions. It was found that the adsorption efficiency of the studied materials in the removal process of Cr(VI) ions from aqueous solutions is in the following order: Ni-CP<Ni-Gly≤Ni-VP.

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