Modification of Sepiolite and its Ability to Remove Heavy Metals

2012 ◽  
Vol 508 ◽  
pp. 200-202
Author(s):  
Zhao Ping Chen ◽  
Ying Wang ◽  
Hang Yu Gu
Keyword(s):  
Heavy Metals ◽  
Removal Rate ◽  
Surface Structures ◽  
Modification Method ◽  
Removal Of Heavy Metals

The modification method and its eftect on the behavior of sepiolite, especially its ability to remove heavy metals, have be reaen systematically studied. Different pretreatment methods have led to various surface structures, which resulted in various effects on removal heavy metals. The processes of modification and removal of heavy metals have been optimized. The highest removal rate for Pb canch more than 96%.

Derivation of Optimum Study Factors for Samples Contaminated with Cd Using Electric/Magnetic Field and ORP

2013 ◽  
Vol 813 ◽  
pp. 519-524
Author(s):  
Sang An Ha ◽  
Jei Pil Wang
Keyword(s):  
Magnetic Field ◽  
Heavy Metals ◽  
Removal Rate ◽  
Underground Water ◽  
Liquid Electrode ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Removal Of Heavy Metals ◽  
High Removal Rate ◽  
Membrane Treatment

A purpose of the present study is to derive optimum study factors for removal of heavy metals using combined alternating current electric/magnetic field and electric membranes for the area contaminated with heavy metals in soil or underground water. ORP (Oxidation Reduction Potential) analysis was conducted to determine an intensity of tendency for oxidation or reduction of the samples contaminated with heavy metals, and electrical membrane treatment was used with adjustment of concentrations and voltages of liquid electrode (Na2SO4) to derive a high removal rate. Removal constants were analyzed to be 0.0417, 0.119, 0.1594 when the voltages were 5V, 10V, 15V, respectively, and treatment efficiency was shown to increase as the liquid electrode concentration was increased. Keywords: heavy metals, electric/magnetic field, ORP, electrical membrane

scholarly journals Removal of heavy metals from an industrial effluent by synthesized zeolite: Case of Bounoura industrial zone

2020 ◽  
Vol 21 (1) ◽  
pp. 80-94
Author(s):  
Bahaz Hanane ◽  
◽  
Hadj Seyd Abdelkader ◽  
Moulai Kromia ◽  
Aggoune Salah ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Rate ◽  
Industrial Effluent ◽  
Industrial Zone ◽  
X Ray Diffraction ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Type Zeolite ◽  
Kinetics And Isotherms ◽  
Kinetics Of

The aim of this paperis the synthesis of a Faujasite type zeolite: 9SiO2: Al2O3: 3Na2O: 120H2O and study its ability to remove heavy metals from an industrial effluent.Characterization of the zeolite was carried out by X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).The study of the elimination of ten heavy metalson anaqueous effluent, taken from the industrial zone of Bounoua(Algeria),showsthat the synthesized zeolite is able to eliminate nearly 40% of the analyzed heavy metals. the results demonstrate a removal rates of metals in a descreasing order, as following: Cd > Mn > Sn > Fe > Cr > Ni > Pb > Mg > Zn > Cu.Cadmium is the most adsorbed metal with a rate of86.47 % and copper takes the last position with a removal rate of19.27 %.The kinetics and isotherms study of adsorbtion of cadmiumby zeoliteshows that the adsorption is managed by kinetics of the pseudo-second order and the Langmuir isotherm represents better the adsorption of this metal.The study demonstrates that, besides the economy, zeolite facilitates the process of adsorbtion. Moreover, the zeolite is very efficient and reliable material to eliminate the heavy metals and to mitigate the problems of pollution of the environment causedby the industrial activities.

Application of Iron Powder Reduction Method to Remove Heavy Metals in Waste Pickling Acid

2020 ◽  
Vol 980 ◽  
pp. 377-386
Author(s):  
Jing Liang Xie ◽  
Fei Fei Chi ◽  
Fan Li Meng ◽  
An Ran Peng
Keyword(s):  
Heavy Metals ◽  
Iron Powder ◽  
Removal Efficiency ◽  
Reduction Method ◽  
Free Acid ◽  
Removal Rate ◽  
Practical Application ◽  
Removal Rates ◽  
Magnetic Stirring ◽  
Removal Of Heavy Metals

The removal of heavy metals in waste pickling acid by iron powder reduction was studied. The effects of reaction time, reaction temperature and dosage of iron powder on the removal efficiency of Zn, Cr, Ni and Pb in waste pickling acid were investigated. The results showed that, the removal rate of Cr tended to be stable after 2 h of reaction under magnetic stirring. After 4 hours, the removal rate of Zn,Ni and Pb tended to be stable. The temperature was increased from 20°C to 90 °C, the removal rates of Ni and Pb could be increased by 9.09% and 11.6%, while the removal rates of Zn and Cr were only increased by 1.15% and 2.85%; Increasing the dosage of iron powder was beneficial to the removal of heavy metals in waste pickling acid, and the combined amount of free acid in the waste acid would affect the removal efficiency of heavy metals. The research results had important guiding significance for the practical application of iron powder reduction method in the heavy metal purification project of waste pickling acid.

Biosorption: An Eco-Friendly Technique for the Removal of Heavy Metals

2011 ◽  
Vol 2 (3) ◽  
pp. 1-8 ◽  
Author(s):  
Sasmita Sabat ◽  
◽  
R V Kavitha R V Kavitha ◽  
Shantha S L Shantha S L ◽  
Gopika Nair ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Of Heavy Metals

Study of the Cu(II) removal from aqueous solutions by adsorption on titania

2013 ◽  
Vol 12 (3) ◽  
pp. 239-247
Keyword(s):  
Heavy Metals ◽  
Ionic Strength ◽  
Toxic Metals ◽  
Low Cost ◽  
Lateral Interaction ◽  
Tio2 Surface ◽  
High Toxicity ◽  
Removal Of Heavy Metals ◽  
Solution Parameters ◽  
Kinetics Of

The removal of heavy metals from wastewaters is a matter of paramount importance due to the fact that their high toxicity causes major environmental pollution problems. One of the most efficient, applicable and low cost methods for the removal of toxic metals from aqueous solutions is that of their adsorption on an inorganic adsorbent. In order to achieve high efficiency, it is important to understand the influence of the solution parameters on the extent of the adsorption, as well as the kinetics of the adsorption. In the present work, the adsorption of Cu(II) species onto TiO2 surface was studied. It was found that the adsorption is a rapid process and it is not affected by the value of ionic strength. In addition, it was found that by increasing the pH, the adsorbed amount of Cu2+ ions and the value of the adsorption constant increase, whereas the value of the lateral interaction energy decreases.

Synergistic Effect of Rhamnolipid and Saponin Biosurfactants on Removal of Heavy Metals from Oil Contaminated Soils

2020 ◽  
Vol 57 (2) ◽  
pp. 109-114
Author(s):  
Amirhossein Dolatzadeh khiyavi ◽  
Reza Hajimohammadi ◽  
Hossein Amani ◽  
Hadi Soltani
Keyword(s):  
Heavy Metals ◽  
Synergistic Effect ◽  
Contaminated Soils ◽  
Removal Of Heavy Metals

Applications of Bentonite to Soil Decontamination

2018 ◽  
Vol 69 (7) ◽  
pp. 1695-1698
Author(s):  
Marin Rusanescu ◽  
Carmen Otilia Rusanescu ◽  
Gheorghe Voicu ◽  
Mihaela Begea
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Laboratory Experiments ◽  
Experimental Studies ◽  
Heavy Metal Concentration ◽  
Polluted Soil ◽  
Raw Material ◽  
Soil Decontamination ◽  
Metal Retention ◽  
Removal Of Heavy Metals

A calcium bentonite from Orasu Nou deposit (Satu Mare Romania) was used as raw material. We have conducted laboratory experiments to determine the influence of bentonite on the degree of heavy metal retention. It has been observed that the rate of retention increases as the heavy metal concentration decreases. Experimental studies have been carried out on metal retention ( Zn) in bentonite. In this paper, we realized laboratory experiments for determining the influence of metal (Zn) on the growth and development of two types of plants (Pelargonium domesticum and Kalanchoe) and the effect of bentonite on the absorption of pollutants. These flowers were planted in unpolluted soil, in heavy metal polluted soil and in heavy metal polluted soil to which bentonite was added to observe the positive effect of bentonite. It has been noticed that the flowers planted in unpolluted soil and polluted with heavy metals to which bentonite has been added, the flowers have flourished, the leaves are still green and the plants whose soils have been polluted with heavy metals began to dry after 6 days, three weeks have yellowish leaves and flowers have dried. Experiments have demonstrated the essential role of bentonite for the removal of heavy metals polluted soil.

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