scholarly journals Use of Viscosity to Probe the Interaction of Anionic Surfactants with a Coagulant Protein from Moringa oleifera Seeds

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Raymond Maikokera ◽  
Habauka M. Kwaambwa
Keyword(s):  
Moringa Oleifera ◽  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Protein Solutions ◽  
Capillary Viscometer ◽  
Protein Solution ◽  
V Protein ◽  
Dodecyl Benzene Sulfonate ◽  
Physical Quantities

The intrinsic viscosity of the coagulant protein was evaluated from the flow times of the protein solutions through a capillary viscometer, and the results suggested the coagulant protein to be globular. The interactions of the coagulant protein with anionic surfactant sodium dodecyl sulphate (SDS) and sodium dodecyl benzene sulfonate (SDBS) were also investigated by capillary viscometry. We conclude that there is strong protein-surfactant interaction at very low surfactant concentrations, and the behavior of the anionic surfactants in solutions containing coagulant protein is very similar. The viscometry results of protein-SDS system are compared with surface tension, fluorescence, and circular dichroism reported earlier. Combining the results of the four studies, the four approaches seem to confirm the same picture of the coagulant protein-SDS interaction. All the physical quantities when studied as function of surfactant concentration for 0.05% (w/v) protein solution either exhibited a maximum or minimum at a critical SDS concentration.

Effects of short-term exposure to linear anionic surfactants (SDBS, SLS and SDS) on anammox biomass activity

RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 53004-53011 ◽  
Author(s):  
Sen Qiao ◽  
Nan Zheng ◽  
Tian Tian ◽  
Cong Yu ◽  
Jiti Zhou
Keyword(s):  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Lauryl Sulfate ◽  
Sodium Dodecyl Sulfonate ◽  
Short Term ◽  
Short Term Exposure ◽  
Biomass Activity ◽  
Dodecyl Benzene Sulfonate ◽  
Anammox Process

This work demonstrates the feasibility of nitrogen removal from wastewater containing linear anionic surfactants, including sodium dodecyl benzene sulfonate, sodium lauryl sulfate and sodium dodecyl sulfonate, by using the anammox process.

scholarly journals Change in chirality of semiconducting single-walled carbon nanotubes can overcome anionic surfactant stabilisation: a systematic study of aggregation kinetics

2015 ◽  
Vol 12 (6) ◽  
pp. 652 ◽  
Author(s):  
Iftheker A. Khan ◽  
Joseph R. V. Flora ◽  
A. R. M. Nabiul Afrooz ◽  
Nirupam Aich ◽  
P. Ariette Schierz ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Single Walled Carbon Nanotubes ◽  
Sodium Deoxycholate ◽  
Single Walled Carbon ◽  
Aggregation Behaviour ◽  
Dodecyl Benzene Sulfonate ◽  
Walled Carbon Nanotubes

Environmental context Chirally enriched semiconducting single-walled carbon nanotubes (SWNTs) are some of the most utilised nanomaterials. Although chirality of SWNTs is known to influence their electronic properties and interfacial interaction, the interplay between chirality and surfactant structure in SWNT stability is not well understood. This study investigates these interactions, providing data to better assess the environmental fate of SWNTs. Abstract Single-walled carbon nanotubes’ (SWNT) effectiveness in applications is enhanced by debundling or stabilisation. Anionic surfactants are known to effectively stabilise SWNTs. However, the role of specific chirality on surfactant-stabilised SWNT aggregation has not been studied to date. The aggregation behaviour of chirally enriched (6,5) and (7,6) semiconducting SWNTs, functionalised with three anionic surfactants – sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium deoxycholate – was evaluated with time-resolved dynamic light scattering. A wide range of mono- (NaCl) and divalent (CaCl2) electrolytes as well as a 2.5mg total organic carbon (TOC) L–1 Suwannee River humic acid were used as background chemistry. Overall, sodium dodecyl benzene sulfonate showed the most effectiveness in stabilising SWNTs, followed by sodium deoxycholate and sodium dodecyl sulfate. However, the larger diameter (7,6) chirality tubes (compared to (6,5) diameter), compromised the surfactant stability due to enhanced van der Waals interaction. The presence of divalent electrolytes overshadowed the chirality effects and resulted in similar aggregation behaviour for both the SWNT samples. Molecular modelling results elucidated key differences in surfactant conformation on SWNT surfaces and identified interaction energy changes between the two chiralities to delineate aggregation mechanisms. The stability of SWNTs increased in the presence of Suwannee River humic acid under 10mM monovalent and mixed-electrolyte conditions. The results suggest that change in chirality can overcome surfactant stabilisation of semiconducting SWNTs. SWNT stability can also be strongly influenced by the anionic surfactant structure.

scholarly journals Controlling of two destructive zooplanktonic predators in Chlorella mass culture with surfactants

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Xiaobin Wen ◽  
Aoqi Zhang ◽  
Xiaoyan Zhu ◽  
Lin Liang ◽  
Yan Huo ◽  
...  
Keyword(s):  
Mass Culture ◽  
Chemical Method ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Biofuel Production ◽  
Benzene Sulfonate ◽  
Microalgae Biomass ◽  
Mass Cultures ◽  
Dodecyl Benzene Sulfonate ◽  
Raceway Ponds

Abstract Background Predatory flagellates and ciliates are two common bio-contaminants which frequently cause biomass losses in Chlorella mass culture. Efficient and targeted ways are required to control these contaminations in Chlorella mass cultivation aiming for biofuel production especially. Results Five surfactants were tested for its ability to control bio-contaminations in Chlorella culture. All five surfactants were able to eliminate the contaminants at a proper concentration. Particularly the minimal effective concentrations of sodium dodecyl benzene sulfonate (SDBS) to completely eliminate Poterioochromonas sp. and Hemiurosomoida sp. were 8 and 10 mg L−1, respectively, yet the photosynthesis and viability of Chlorella was not significantly affected. These results were further validated in Chlorella mass cultures in 5, 20, and 200 m2 raceway ponds. Conclusions A chemical method using 10 mg L−1 SDBS as pesticide to control predatory flagellate or ciliate contamination in Chlorella mass culture was proposed. The method helps for a sustained microalgae biomass production and utilization, especially for biofuel production.

Spontaneous Formation of DTAB/SDBS Vesicles

2013 ◽  
Vol 734-737 ◽  
pp. 2505-2508
Author(s):  
Lin Lin Cui ◽  
Hua Nan Guan
Keyword(s):  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Ammonium Bromide ◽  
Benzene Sulfonate ◽  
Complex Formulation ◽  
Structure And Morphology ◽  
Spontaneous Formation ◽  
Dodecyl Benzene Sulfonate ◽  
Dodecyl Trimethyl Ammonium Bromide ◽  
The Stability

Dodecyl trimethyl ammonium bromide/sodium dodecyl benzene sulfonate (DTAB/SDBS) complex formulation of scale effect on the spontaneous formation of vesicles and the influence of different factors on the stability of vesicles were discussed, structure and morphology of vesicles were observed.

The Study of Surfactant Effect on Soil Water Infiltration

2011 ◽  
Vol 361-363 ◽  
pp. 1946-1949
Author(s):  
Yi Fei Li ◽  
Tian Wei Qian ◽  
Li Juan Huo
Keyword(s):  
Hydraulic Conductivity ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Saturated Hydraulic Conductivity ◽  
Water Infiltration ◽  
Ammonium Bromide ◽  
Soil Infiltration ◽  
Soil Water Infiltration ◽  
Dodecyl Benzene Sulfonate ◽  
Cetyl Trimethyl Ammonium

In this paper,the effect of surfactant to the infiltration and the change of saturated hydraulic conductivity was studied by GUELPH PERMEAMETER. We investigated effects on soil infiltration by three representative surfactants.The results show that the existing of sodium dodecyl benzene sulfonate (SDBS), cetyl trimethyl ammonium bromide bromide (CTAB) and polyxyethylene fatty alcohol (AEO9) would decrease soil saturated hydraulic conductivity.

scholarly journals Remediation of Cr(VI)/Cd(ІІ)-Contaminated Groundwater with Simulated Permeable Reaction Barriers Filled with Composite of Sodium Dodecyl Benzene Sulfonate-Modified Maifanite and Anhydride-Modified Fe@SiO2@Polyethyleneimine: Environmental Factors and Effectiveness

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Jingqing Gao ◽  
Yalin Zhai ◽  
Zhenzhen Huang ◽  
Peng Ren ◽  
Jianlei Gao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Composite Material ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Contaminated Groundwater ◽  
Column Experiments ◽  
Benzene Sulfonate ◽  
Dodecyl Benzene Sulfonate

A composite material of sodium dodecyl benzene sulfonate- (SDBS-) modified maifanite and anhydride-modified Fe@SiO2@PEI (PEI) was used as an adsorbent for the removal of hexavalent chromium (Cr(VI)) and bivalent cadmium (Cd(II)) from groundwater by using column experiments and simulated PRB test. In this study, the optimum proportion of SDBS-modified maifanite and anhydride-modified Fe@SiO2@PEI was 5 : 1. In the column experiments, it was found that the penetration time increased with the increase of the initial concentrations (30, 60, and 90 mg/L) and the decrease of the flow rates (5.45, 10.9, and 16.35 mL/min) at an influent pH of 6.5 ± 0.3 . It was also obtained that the removal rates of Cr(VI) and Cd(ІІ) reached 99.93% and 99.79% at an initial Cr(VI) and Cd(ІІ) concentration of 30 mg/L with the flow rate of 10.9 mL/min, respectively, at 6 h. Furthermore, excellent removal effectiveness of Cr(VI) and Cd(ІІ) (85.94% and 83.45%, respectively) was still achieved in simulated PRB test at a flow rate of 5.45 mL/min with the heavy metal solution concentration of 5.0 ± 0.5  mg/L (Cr(VI) and Cd(II) concentration were, respectively, 5.0 ± 0 . 5 mg/L); and the adsorbent had not completely failed by the end of the trial. Yoon-Nelson model was successfully applied to predict the breakthrough curves for the assessment of composite material heavy metal removal performance and was in good agreement with the experimental data of the heavy metal removal efficiency. The strong removal ability of the adsorbent could be attributed to the fact that maifanite with a large diameter can provide support and increase the permeability coefficient and porosity and that zero-valent iron (ZVI) can convert Cr(VI) to Cr(III) and improve the adsorption capacity of maifanite. The obtained results suggested that the novel PRB fillers have great significance for preventing and controlling Cr(VI)/Cd(ІІ)-contaminated groundwater.

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