Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Bentonite

Thermally Activated Bentonite As a Supplementary Cementitious Material – A Review

Amer A. Al-Hammood; Qais J. Frayyeh; Waleed A. Abbas

Engineering and Technology Journal, 2021, Volume 39, Issue 2A, Pages 206-213
DOI: 10.30684/etj.v39i2A.1733

Bentonite is a mixture of clay and non-clay minerals. Montmorillonite clay mineral is a dominant mineral in bentonite. Silica and alumina bond in the crystal structure of montmorillonite. Therefore, they cannot contribute to the pozzolanic reaction. Heat treatment of bentonite leads to the destruction of the crystal structure of montmorillonite and converting silica and alumina to reactive phases. Thermally activated bentonite (TAB) is a relatively low reactive pozzolan when used as partial replacement of Portland cement modifies both fresh and hardened properties of cement paste, mortar, and concrete. The most desired effects of TAB are: improve segregation resistance, reduce the rate of strength gain, and enhance concrete durability against sulfates, chlorides, and acids, in addition to economic and ecological beneficiations. This paper provides information related to heat treatment of bentonite clays and montmorillonite minerals, and their effects on the paste, mortar, and concrete when used as a partial replacement of Portland cement.

Green Synthesis of Iron Nanoparticles Using Black Tea Leaves Extract as Adsorbent for Removing Eriochrome Blue-Black B Dye

Dalal Ghanim; Ghayda Y. Al-Kindi; Ahmed Kh. Hassan

Engineering and Technology Journal, 2020, Volume 38, Issue 10A, Pages 1558-1569
DOI: 10.30684/etj.v38i10A.1225

Recently, the world has directed to find environmentally friendly and clean materials to be used to treat wastes difficult to treat in the traditional way such as dyes. The object of this study was to synthesize iron nanoparticles using black tea extracts in an environmentally sustainable method. Also, it was developed by supporting with bentonite, used to remove Eriochrome blue-black B dyes from synthesis wastewater of textile factory. From the results, it was noted that black tea leaf extract has reduced iron ions to iron nanoparticles at room temperature. Composite iron nanoparticles were characterized using Scanning Electron Microscope (SEM), and Atomic force microscopy (AFM) studies where the diameter of iron nanoparticles was less than 70 nm. This research shows that ferrous nanoparticles can be manufactured using black tea leaf extract as a reducing agent. It also shows better-supported nanoparticles than unsupported. The decolorization efficiency catalyzed BT-NZVI, B-BT-NZVI increased from (14%, 42%) to (48%, 68%) at 180 min of batch processes when the NZVI concentration was increased from 0.5 g/L to 2 g/L respectively.

Study the Dye Decolorization of Wastewater Using Bentonite, H2O2, Ultrasonic and Laser Techniques

A.Z. Mohammed; A. Sh. Hamadi; H.A.M. Redha

Engineering and Technology Journal, 2018, Volume 36, Issue 1, Pages 41-45

The bentonite is an adsorbent material that is used frequently in industrial fields. bentonite was used with laser to treat wastewater, when laser is a new technique that has ability to remove the dye. Using of laser as a source to refresh with high efficiency has the important in industrial field.In this study laser diode with power 50 mw, He-Ne laser with power 10 mw and DPSSL with power 500 mw were used with the help of ultrasonic bath and H2O2 to promote the work of the laser. AFM and FTIR testing were made to bentonite to study the characteristics of it. Minitab program was used to facilitate calculations and choose the optimum parameters of experiments. The optimum input conditions of experiments to remove the dye from wastewater were chosen. The best concentration of bentonite is 4 g/l, the best temperature of wastewater is 42◦C, the best time of work is 27 min and the best concentration of H2O2 is 10%. It found from study that the increase of each parameters cause decrease in output concentration of wastewater. The accuracy of work was determined from Minitab program, it was 94.54%.

Mechanical Strength of Silicon Carbide Bonded with Iraqi Clays

Abdul Mutalb Al Sheikh; Shihab Ahmed Zaidan Al- Juboori; Kassim S. Kassim

Engineering and Technology Journal, 2011, Volume 29, Issue 4, Pages 665-676

Two types of Iraqi clays (Kaolin and Bentonite) were used in bonding process
with different weight percentage (5%, 10%, 15%, 20%, and 25%) and with
different particle size from clays and silicon carbide.
The specimens were formed by using low biaxial pressing and two types of
internal lubricants (sodium silicate and the carbon paste) to increase the
specimen's cohesion. These specimens were sintered at various temperatures of
(1100°C, 1200°C, 1300°C, and 1400°C).
Increasing of clay percentage leads to decreasing the porosity. But it leads to
increase mechanical properties (compressive strength, diametrical strength and
bending strength ). Also, the effect of particle size on all properties is studied
together with sintering temperature. All mechanical properties (when bonded SiC
with bentonite) are higher than kaolin bonded SiC.

Development and Strength Properties of PP/PA6/RED Kaoline and PP/PA6/ Bentonite Blends

Najat J. Saleh

Engineering and Technology Journal, 2009, Volume 27, Issue 12, Pages 2322-2335

In the present work a new type of composite material has been prepared
from mixing of polypropylene and polyamide 6 at constant ratio (80/20)] and
adding different weight percent (0, 5,10,15)% of both local bentonite and red
kaoline fillers respectively by using single screw extruder .Some of mechanical
properties such as tensile strength (Young modulus) tensile at fracture and
elongation of filled and unfilled PP/PN6 blends were determined at different
temperatures, and different weight percent of filler. Addition of filler increases the
Young modulus and tensile strength at break. Bentonite filler gives better
mechanical properties, than red kaoline fillers. Also empirical equations were
obtained which could be utilizing to calculate one of the mechanical properties in
term of temperatures and weight fraction of filler content. An equation was
proposed to show the best fit with experimental data, relevant contour diagrams,
for optimization of properties is also presented.