scholarly journals Sustainable Treatment of Heavy Metals by Adsorption on Raw Chitin/Chitosan

2021 ◽  
Author(s):  
Boukhlifi Fatima
Keyword(s):  
Heavy Metals ◽  
High Temperature ◽  
Adsorption Kinetics ◽  
Solid Materials ◽  
Equilibrium Time ◽  
Negative Effect ◽  
Sustainable Treatment ◽  
Raw Shrimp ◽  
Kinetics Of ◽  
Different Origin

The objective of this chapter was to treat metal pollution of wastewater rich in Pb2+, Cd2+, Cu2+, and Zn2+ ions by adsorption tests on the raw chitin/chitosan. Different origin namely shrimp (Ccre), crab (Ccra) and lobster (Clan). Raw shrimp chitin had a strong affinity for Pb2+ and Cd2+. The adsorption capacity of zinc on the crabs chitin is twice as great as that on the shrimp chitin. The kinetic study showed that more than 50% of these ions are adsorbed before equilibrium is reached (20 minutes). The adsorption kinetics also showed that the hardness of the shells has a negative effect on the kinetics of the adsorption process. Indeed, the adsorption of Pb2+ on the raw chitin shrimp requires only 30 minutes, while on the raw chitin lobster; the equilibrium time is 60 minutes. To ensure a sustainable treatment, sludge generated by adsorption of heavy metals was incinerated at high temperature. Incineration has led to calcite phases, which do not represent any toxicity on the environment and it can be recycled in the industry of solid materials (ceramics, cement, etc.). However, the regeneration of sludge by the acid changes the structure of the material and gives new adsorbent supports.

scholarly journals PENJERAPAN LOGAM KADMIUM (Cd2+) DENGAN ADSORBEN CANGKANG TELUR BEBEK YANG TELAH DIAKTIVASI

2013 ◽  
Vol 2 (3) ◽  
pp. 29-32
Author(s):  
Krisnawati ◽  
Jasinda ◽  
Iriany
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Adsorption Isotherm ◽  
Adsorption Kinetics ◽  
Adsorption Equilibrium ◽  
Adsorption Kinetic ◽  
Equilibrium Time ◽  
First Order ◽  
As Adsorption ◽  
Cadmium Adsorption

Harzadous waste water is the waste that can be harmful to human’s health. One of heavy metals that contains in harzadous waste is cadmium. This research aims to investigate the characteristic of cadmium adsorption, equilibrium time, percentage adsorption, adsorption kinetic, adsorption isotherm and capacity of cadmium adsorption by using duck egg’s shell adsorbent. Duck egg’s shell adsorbent that had been activated at 600 oC were put into cadmium solution and mixed together. Every 10 minutes experimental samples were analyzed using AAS. The results indicated that percentage adsorption increases and the longer equilibrium time will be reached with an increase of adsorbent dosage. The Lagergen first order Models was applied as adsorption kinetics model and the Bangham Models was applied as adsorption isotherms models.

scholarly journals Investigation on adsorption kinetics of heavy metals by rice husk

2018 ◽  
Vol 46 (2) ◽  
pp. 125 ◽  
Author(s):  
N. Priyantha ◽  
A.N. Navaratne ◽  
T.P.K. Kulasooriya
Keyword(s):  
Heavy Metals ◽  
Rice Husk ◽  
Adsorption Kinetics ◽  
Kinetics Of

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

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.

THYROTHERM 2885

Alloy Digest ◽  
2008 ◽  
Vol 57 (3) ◽  
Keyword(s):  
Heavy Metals ◽  
High Temperature ◽  
Physical Properties ◽  
Tool Steel ◽  
Heat Treating ◽  
Temperature Performance ◽  
Hot Work Tool Steel

Abstract Thyrotherm 2885 is a hot-work tool steel used mainly as extrusion tooling for heavy metals. This datasheet provides information on composition, physical properties, and hardness as well as creep. It also includes information on high temperature performance as well as forming and heat treating. Filing Code: TS-662. Producer or source: Schmolz + Bickenbach USA Inc.

Adsorption Kinetics of Diblock Copolymers from a Micellar Solution on Silica and Titania

1998 ◽  
Vol 31 (26) ◽  
pp. 9281-9294 ◽  
Author(s):  
H. D. Bijsterbosch ◽  
M. A. Cohen Stuart ◽  
G. J. Fleer
Keyword(s):  
Adsorption Kinetics ◽  
Micellar Solution ◽  
Diblock Copolymers ◽  
Kinetics Of ◽  
Silica And Titania
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