scholarly journals Effect of Surfactant on Water Content of Phosphogypsum

2019 ◽  
Vol 9 (8) ◽  
pp. 1684
Author(s):  
Bing Li ◽  
Hao Peng ◽  
Jing Guo
Keyword(s):  
Stearic Acid ◽  
Water Content ◽  
Filtration Rate ◽  
Sodium Dodecyl ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Leaching Rate ◽  
Blank Group ◽  
Wet Process ◽  
Dodecylbenzene Sulfonate ◽  
Phosphate Leaching

Phosphogypsum is a kind of solid waste produced in wet process of producing phosphoric acid, which affects the filtration rate and water content of phosphogypsum. The effects of single surfactant sodium dodecyl sulfate (SDS), sodium dodecylbenzene sulfonate (SDBS), stearic acid (SR) and polydimethylsiloxane (PDMS) and coupled surfactants on the water content of phosphogypsum were investigated. The results show that, during the leaching process, surfactant strengthened the interfacial interactions between molecules through hydrophobic and hydrophilic orientation on solid–liquid interface, reduced the surface tension and contact angle to improve the filtration rate and reduced the soluble phosphorus loss, thereby improving the leaching rate of phosphate rock and reducing the water content of phosphogypsum. Among them, the water content of phosphogypsum was better controlled by stearic acid and sodium dodecylbenzene sulfonate than the other surface surfactants. Compared with the blank group, the stearic acid and sodium dodecylbenzene sulfonate increased the filtration rate of phosphogypsum by 24.34%, the moisture content decreased by 3%, and the phosphate leaching rate increased by 4.36%.

Dispersion of Carbon Nanotubes in Cement-Based Composites and Its Influence on the Piezoresistivities of Composites

2009 ◽  
Author(s):  
Baoguo Han ◽  
Xun Yu ◽  
Jinping Ou
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Cement Mortar ◽  
Sodium Dodecyl ◽  
Impulsive Loading ◽  
Repeated Loading ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Dodecylbenzene Sulfonate ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (NaDDBS) are used as surfactants to improve the dispersion of multi-walled carbon nanotubes (MWNTs) in cement mortar and fabricate piezoresistive carbon-nanotube/cement mortar composite. The piezoresistivity of carbon-nanotube/cement mortar composite with different content levels of MWNTs and different surfactants were explored under repeated loading and impulsive loading. Experimental results indicate that NaDDBS has higher efficiency than SDS for the dispersion of MWNTs in cement mortar. The response of the electrical resistance of carbon-nanotube/cement mortar composite with NaDDBS to external force is more stable and sensitive than that of carbon-nanotube/cement mortar composite with SDS. These findings indicate that the use of NaDDBS is an effective way for improving the dispersion of MWNTs in cement-based composite and fabricating MWNTs filled cement-based composite with stable and strong piezoresistive response.

scholarly journals Sodium Dodecylbenzene Sulfonate-Modified Biochar as An Adsorbent for The Removal of Methylene Blue

2021 ◽  
Vol 16 (1) ◽  
pp. 188-195
Author(s):  
Argo Khoirul Anas ◽  
Sandy Yudha Pratama ◽  
Aqidatul Izzah ◽  
Muhammad Arsyik Kurniawan
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Sodium Dodecyl ◽  
Waste Utilization ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Biomass Waste ◽  
Modified Biochar ◽  
Dodecylbenzene Sulfonate ◽  
Open Access Article

Biochar is an interesting adsorbent material due to its use is correlated with biomass waste utilization and also minimize environmental pollution from high amount of biomass by-product. Regarding to improve the biochar ability in water treatment, several surface modifications have been developed, one of them is modification using surfactant. In this study, sodium dodecylbenzene sulfonate (SDBS) was used to modify the surface of biochar prepared from pyrolysis of cassava peels (Manihot utilissima). Its performance in biochar modification to remove methylene blue (MB) dyes was compared with sodium dodecyl sulphate (SDS) surfactant for observing the important of – interactions mechanisms. The analysis of biochar and biochar-SDBS were conducted by using Fourier transform infrared (FTIR), CHNS elemental analysis, and scanning electron microscope (SEM). Furthermore, the adsorption experiments were conducted using UV-Vis spectrophotometer. It is known that modification using SDBS could increase the adsorption capacity of biochar not only from electrostatic interaction but also through – interactions mechanisms. In this respect, as the amount of SDBS mass increased, the adsorption capacity was also improved due to the modification produced more active cites on biochar. The maximum MB adsorption onto biochar-SDBS occurred at adsorbent mass of 15 mg with optimum pH value of 10. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Treatment of Exhaust Gas Loaded with Chlorinated VOC by Composite Adsorbent

2012 ◽  
Vol 550-553 ◽  
pp. 2125-2128 ◽  
Author(s):  
Ding Sheng Chen ◽  
Chao Ping Cen ◽  
Zhi Xiong Tang ◽  
Ping Fang ◽  
Zhi Hang Chen
Keyword(s):  
Sodium Dodecyl ◽  
Tween 20 ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Exhaust Gas ◽  
Sorbitan Monolaurate ◽  
Composite Adsorbent ◽  
Composite Adsorbents ◽  
Dodecylbenzene Sulfonate ◽  
Liquid Absorption ◽  
Maximum Removal

Three surfactant, sodium dodecyl sulfate (SBS), sodium dodecylbenzene sulfonate(SDBS), Polyoxyethylene Sorbitan Monolaurate(Tween 20), Turkey red oil sodium salt(TROS), were prepared and tested as composite adsorbents to remove chlorinated volatile organic component from exhaust gas. A gas–liquid absorption equipment was used to evaluate the performance of composite adsorbents. It is found that the three composite adsorbents could all effectively remove chlorobenzene but their absorption abilities were rather different. The maximum removal efficiency of chlorobenzene is composite absorbent TROS with low surface tension, reached as high as 85%, much greater than those of Tween 20 and SDBS (38% and 65%, respectively).

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