scholarly journals Effects of Bentonite Nanoclay and Cetyltrimethyl Ammonium Bromide Modified Bentonite Nanoclay on Phase Inversion of Water-in-Oil Emulsions

2020 ◽  
Vol 4 (1) ◽  
pp. 2
Author(s):  
Sileola B. Ogunlaja ◽  
Rajinder Pal
Keyword(s):  
Contact Angle ◽  
Aqueous Phase ◽  
Phase Inversion ◽  
Volume Fraction ◽  
Critical Volume ◽  
Ammonium Bromide ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Modified Bentonite ◽  
Critical Volume Fraction ◽  
Cetyltrimethyl Ammonium

The effects of unmodified and modified bentonite nanoclays (with various degrees of surfactant modification) on the catastrophic phase inversion from water-in-oil (W/O) emulsion to oil-in-water (O/W) emulsion were determined experimentally. The bentonite nanoclay (NC-Bt) was suspended in the aqueous phase, and the critical volume fraction of water where phase inversion from W/O to O/W emulsion took place was determined through conductivity measurements. Cetyltrimethyl ammonium bromide (CTAB) was used as a surfactant to modify the nanoclay. The adsorption of CTAB onto nanoclay had a strong influence on the contact angle and the critical volume fraction of water where phase inversion took place. The modification of the nanoclay brought about by the adsorption of CTAB increased the three-phase contact angle (measured through the aqueous phase), thereby making it more hydrophobic, and prolonged the phase inversion point. CTAB alone and CTAB-modified nanoclay delayed the phase inversion process in a similar manner, showing a strong dependence on the CTAB concentration.

Hydroxy-aluminium and cetyltrimethyl ammonium bromide modified bentonite as adsorbent and its adsorption for Orange II

2017 ◽  
Vol 94 ◽  
pp. 244-253
Author(s):  
Dandan Xu ◽  
Wenyun Li ◽  
Kewang Wang ◽  
Yunshan Bai ◽  
Qingwen Lin ◽  
...  
Keyword(s):  
Ammonium Bromide ◽  
Orange Ii ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Modified Bentonite ◽  
Cetyltrimethyl Ammonium

Enhanced oil–mineral aggregation with modified bentonite

2013 ◽  
Vol 67 (7) ◽  
pp. 1581-1589 ◽  
Author(s):  
Li Chen ◽  
Yanbo Zhou ◽  
Xiaoqian Wang ◽  
Thomas Zwicker ◽  
Jun Lu
Keyword(s):  
Surface Properties ◽  
Mineral Content ◽  
Ammonium Bromide ◽  
Critical Factors ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Mineral Aggregate ◽  
Modified Bentonite ◽  
Oil Concentration ◽  
Cetyltrimethyl Ammonium ◽  
Spherical Droplets

The application of modified-bentonite-enhanced oil dispersion in water and oil–mineral aggregate (OMA) formation was studied in the laboratory. The effect of modification on the surface properties of bentonite was characterized. The hydrophobicity and surface electric properties of bentonite were significantly improved by attaching cetyltrimethyl ammonium bromide to its surface. The results showed that surface properties of bentonite played an important role in OMA formation. Spherical droplets of OMAs were formed with natural bentonite and elongated solid OMAs and flake OMAs were formed with modified bentonite as observed by fluorescence microscopy. The effects of shaking time, oil concentration and mineral content were also studied. It was suggested that oil concentration and mineral content were critical factors and OMA formed rapidly with both types of bentonite. Modified bentonite had better performance on OMA formation than hydrophilic natural bentonite.

Study on Advanced Treatment of Coking Wastewater Using Modified Bentonite

2012 ◽  
Vol 518-523 ◽  
pp. 1997-2000
Author(s):  
Hai Xia Guo ◽  
Fei Ding
Keyword(s):  
Ph Value ◽  
Ammonia Nitrogen ◽  
Advanced Treatment ◽  
Ammonium Bromide ◽  
Coking Wastewater ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Modified Bentonite ◽  
Aluminum Sulphate ◽  
Cetyltrimethyl Ammonium

The purpose of this paper is to study the effectively remove organic and inorganic contaminatants in advanced treatment of coking wastewater and try to find a new efficient and inexpensive economical adsorbent project. The organic-inorganic modified Bentonite is used in the experiment as the adsorbent to find out the adsorptive capability under the different conditions of temperature, PH value, adsorptive time, and so on. The results show that Al—CTMAB MB (Aluminum Sulphate & cetyltrimethyl ammonium bromide Modified Bentonite)can reduce the ammonia nitrogen and COD in coking wastewater in the experiment with the dosage of 50g/L, shock for 30 min and PH value is 9 for the best project.

Scheelite (CaWO4)-type microphosphors: Facile synthesis, structural characterization and photoluminescence properties

2016 ◽  
Vol 30 (32n33) ◽  
pp. 1650400 ◽  
Author(s):  
Yuanyuan Han ◽  
Dan Wang ◽  
Danyang Liang ◽  
Shiqi Wang ◽  
Guoxin Lu ◽  
...  
Keyword(s):  
Luminescence Decay ◽  
Precipitation Method ◽  
Ammonium Bromide ◽  
Photoluminescence Properties ◽  
Facile Synthesis ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Broad Emission ◽  
Transition Formula ◽  
Cetyltrimethyl Ammonium ◽  
Uv Excitation

Scheelite (CaWO4)-type microphosphors were synthesized by the precipitation method assisted with cetyltrimethyl ammonium bromide (CTAB). All compounds crystallized in the tetragonal structure with space group [Formula: see text] (No. 88). FE-SEM micrographs illustrate the spherical-like morphologies and rough surface. PL spectra indicate the broad emission peak maximum at 613 nm under UV excitation. Luminescence decay curves monitored by [Formula: see text] transition ([Formula: see text] nm) of Eu[Formula: see text] in doped CaWO4 are presented, the curves exhibit a single-exponential feature and the lifetime for doped CaWO4 is 0.61 ms.

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