Effect Of Sodium Dodecyl Benzene Sulfonate Research Articles

Composite modification of anion exchange membrane by in-situ layer-by-layer assembly to improve antifouling performance

A novel composite modified strategy by in-situ layer-by-layer (LBL) assembly was proposed to improve antifouling performance of anion exchange membrane (AEM) without requiring disassembling the membrane stack. In this approach, the modified layer consisting of (poly (sodium 4-styrene sulfonate) (PSS) and dopamine (DA))/(polyethylene imine (PEI) and DA) was alternately constructed on the AEM surface via reversal electrodeposition. The in-situ LBL assembly modified layer not only contained more hydrophilic and negatively charged groups, but also contained more covalent bonding structures due to copolymerization between PEI and DA. As a result, the in-situ LBL assembly five layers composite modified membrane stack (Co-5Layer) had the optimal antifouling performance with alkaline stability, and it had no discernible effect on the desalination performance. Meanwhile, the effect of sodium dodecylbenzene sulfonate on the ion transmembrane migration was revealed by in-situ electrochemical impedance spectroscopy tests. This work provided a new idea of overcoming AEM fouling through in-situ surface modification.

Study on the effect of SDBS and SDS on deep coal seam water injection

Coal seam water injection, as an important disaster prevention means in the process of coal mining, can effectively suppress coal dust, add water injection additives, can effectively improve the wettability of coal body, improve the permeability of coal body, so as to achieve the prevention of rock burst. To improve the wettability of coal in coal seam water injection, the surfactant is often added to water, but sodium dodecyl benzene sulfonate (SDBS) and sodium dodecyl sulfate (SDS) have limitations in improving wettability of deep coal seam by injecting water. Therefore, it is very important to determine the influencing factors of SDBS and SDS to improve the wettability of coal. In this paper, the effects of oxygen-containing functional groups and minerals in coal on the wettability of coal are revealed, and the wettability mechanism of SDBS and SDS is expounded from the microscopic point of view. SEM was used to characterize the interaction between coal surface and surfactant, and the contact angle experiment was used to verify the influence of minerals in coal on wettability. Inductively coupled plasma atomic emission spectroscopy (ICP) and dynamic light scattering (DLS) tests were used to characterize the interaction of SDBS, SDS with minerals and the size of precipitation generated by the interaction of SDBS, SDS and mineral ions. The results showed that SDBS and SDS interact with Ca2+ to produce precipitation and block the flow of water in coal, which is not conducive to improving the wettability of deep coal seam to a certain extent. The significant chelating effect of chelating agent and Ca2+ provides a feasible solution to this problem.

Effect of Sodium Dodecyl Benzenesulfonate on the Formation Kinetics of Methane Hydrate

Effect of Sodium Dodecyl Benzenesulfonate on the Formation Kinetics of Methane Hydrate

Effect of Sodium Dodecylbenzene Sulfonate on the Wetting Mechanism of Tunliu Coal

AbstractCoal dust in the coal mining process may lead to a serious threat to the safety and health of miners. The addition of surfactants during coal seam water infusion can significantly improve the effect of dust suppression, so it is crucial to study the influence mechanism of surfactants on coal wettability. The variation of the hydration film thickness on the Tunliu coal surface at different concentrations of sodium dodecylbenzene sulfonate (SDBS) solution was investigated by atomic force microscopy. The experimental results indicate that the hydration film thickness increases initially and decreases afterward with the SDBS solution concentration increase, with a maximum value of 11.4 nm. The surface free energy (SFE) of coal molecules adsorbed with different numbers of SDBS molecules were calculated using two coal molecule cell models developed by Materials studio 8.0, and the simulation results display a good agreement with the experiments. The higher the SFE, the greater the hydration film thickness on the coal surface, and the stronger the enhancement effect of SDBS solution on the wettability of coal at the corresponding concentration. The interface formation energy (IFE) and cohesive energy density (CED) of coal molecules after adsorption of SDBS molecules were calculated separately. It was found that when three SDBS molecules were adsorbed, the absolute value of IFE and CED reached the maximum, and each SDBS molecule had the strongest average effect on coal molecules, the bond between them would be tighter. SFE simulations are helpful to optimize the selection of surfactants for practical engineering applications.

Effect of sodium dodecylbenzene sulfonate on hydrogen production from dark fermentation of waste activated sludge

Sodium dodecylbenzene sulfonate (SDBS), a typical surfactant being widely used in various applications, was highly accumulated in waste activated sludge. To date, however, its effect on hydrogen production from dark fermentation of sludge has not been documented. The work therefore aimed to explore whether and how SDBS affects hydrogen production. Experimental results showed that with an increase of SDBS from 0 to 30 mg/g TSS, the maximal hydrogen yield increased from 2.47 to 10.73 mL/g VSS (without any treatment) and from 13.05 to 23.51 mL/g VSS (under free ammonia pretreatment). Mechanism exploration showed that SDBS lowered surface tension, facilitated organics transfer from solid to liquid. SDBS also destroyed hydrogen bonding networks of protein, promoted macromolecular organics degradation. Besides, SDBS improved the electric charge in organics, then weakened the mutual repulsion, improved adsorb, interact and promoted the availability of reaction sites between anaerobes and organic substances. Enzyme activity analysis showed that SDBS not only improved the activities of enzymes related to hydrolysis and acidification processes, but also inhibited the activities of homoacetogens and methanogens. SDBS presence lowered sludge ORP and created an environment which was helpful to the growth of butyric-type bacteria, thus enhanced butyric-type fermentation, which contributed hydrogen production largely. Microbial community analysis revealed that SDBS existence affected distributions of microbial populations, and increased the abundances of hydrogen producing microorganisms (e.g., unclassified_f_Synergistaceae). PICRUSt2 analysis showed that SDBS reduced hydrogenotrophic methanogens activity for its inhibitory effect on the biotransformation of 5,10-Methenyl-THMPT to 5-methyl-THMPT.

Spectroscopic insight into the role of SDBS on the interface evolution of Mg in NaCl corrosive medium

To gain insights into the effect of sodium dodecylbenzene sulfonate (SDBS) on Mg corrosion in NaCl medium, in-situ Raman spectroscopy was employed to monitor the interface evolutions of Mg surface in NaCl and NaCl+SDBS solutions. Accompanied by ex-situ Raman, SEM and XPS results, the evolution models during Mg corrosion in corrosive media were established to reveal the influence of DBS−. Competitive adsorption models about the interface of Mg/NaCl+SDBS between DBS− and Cl− were also presented to explain the inhibition effect of SDBS. These models guide the optimal usage of SDBS in Mg alloy corrosion inhibition.

Deciphering the effect of sodium dodecylbenzene sulfonate on up-flow anaerobic sludge blanket treatment of synthetic sulfate-containing wastewater

Deciphering the effect of sodium dodecylbenzene sulfonate on up-flow anaerobic sludge blanket treatment of synthetic sulfate-containing wastewater

Tris (1-chloro-2-propyl) phosphate (TCPP) microcapsules for the preparation of flame-retardant rigid polyurethane foam

ABSTRACT Toxic liquid tris (1-chloro-2-propyl) phosphate) (TCPP) was microencapsulated with the melamine-formaldehyde resin in water and added as the fire-retardant into the polyurethane foam to slow down its diffusion out. The effect of sodium dodecyl benzenesulfonate and polyvinyl alcohol contents on the particle size was studied and the average size of about 50–250 μm was produced. Increasing the stirring rate and PVA content decreased the diameter of the microcapsule. The cell size of polyurethane foams containing TCPP microcapsules was in the range of 100–600 μm. The polyurethane foam containing 9 wt% of the TCPP microcapsules was HB grade flame-rated.

The Effect of Surfactants on the Properties of Colloid Precursor Li2TiO3

A lithium titanate (Li2TiO3) precursor colloid with high stability was synthesized via a novel inorganic precipitation–peptization method using low cost titanium sulfate as a titanium source, lithium acetate as a lithium source and hydrogen peroxide as a complexing agent. The formation mechanism of the precursor sol was discussed, and the effect of the addition of triethanolamine (TEOA) and sodium dodecylbenzenesulfonate (SDBS) on the colloidal stability was investigated in detail. Samples were characterized with thermogravimetric analysis–differential scanning calorimetry (TG-DSC), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Brunnauer–Emmet–Teller (BET) analysis. The results indicate that the colloid stability is enhanced by increased dosage of TEOA and SDBS within a certain range. The best colloid stability is achieved when the amount of TEOA added is 0.75%, and the sol system can remain stable for up to 15 days, which is 7.5 times that of the precursor sol without added surfactant. The optimal amount of added SDBS is 0.125%, and the effect of SDBS on colloid stability is not as significant as that of TEOA. SDBS favors the formation of the crystal structure of Li2TiO3, while TEOA inhibits the ordered arrangement of Li+ in the main crystal layer. The sample (Li2TiO3) surface with SDBS shows a porous structure, which is conducive to the subsequent pickling treatment.

Deciphering the role of premicellar and micellar concentrations of sodium dodecyl benzenesulfonate surfactant in insulin fibrillation at pH 2.0

Amyloid fibril formation by proteins and their deposition in cells and tissues are associated with several amyloid-based disorders. Understanding the mechanism of amyloid fibril formation is thus of the utmost importance for the designing ligands that could prevent or inhibit the fibrillation process and help to treat of such disorders. We describe the stimulatory effect of sodium dodecyl benzenesulfonate (SDBS) on insulin amyloid fibrillation at pH 2.0 and the characterization of SDBS-induced insulin aggregation using spectroscopy and microscopy. We found that SDBS induced amyloid-like aggregates of insulin at sub-micellar (0.1–1.2 mM), but not post-micellar (≥2.0 mM) concentrations. The amyloid fibrillation of insulin induced by SDBS was kinetically rapid and escaped the lag phase. Far-UV CD findings suggested that the α-helical content of insulin transformed into cross-β structure and mixed α and β structures when incubated with sub-micellar and post-micellar SDBS concentrations, respectively. The overall results indicated that low, but not high SDBS concentrations induce amyloid-like insulin aggregates and fibrils.

Effect of SDBS on the oxidation reliability of screen-printed Cu circuits

Cu nanopaste is a candidate to replace Ag nanopaste, but the oxidation problems associated with Cu nanopaste must be overcome. In this study, we fabricated Cu nanopaste with various contents of sodium dodecylbenzene sulfonate (SDBS), and the oxidation behaviors of Cu nanopaste with various contents of SDBS were investigated. Then, Cu nanopastes were printed using a screen-printing machine and sintered with infrared energy. The fabricated circuits were evaluated using high-temperature storage tests and steady-state temperature humidity bias life testing. The printed Cu pattern with SDBS showed better oxidation-resistant properties than that without SDBS. After the reliability test, 2 wt% of SDBS shows less oxide based on X-ray diffraction, microstructure, and electrical resistivity measurements, and the optimized content of SDBS was 2 wt% in the Cu nanopaste.

Electrochemical impedance spectroscopy of a reverse electrodialysis stack: A new approach to monitoring fouling and cleaning

When harvesting salinity gradient energy via reverse electrodialysis (RED), stack performance is monitored using DC characterizations, which does not provide information about the nature and mechanisms underlying fouling inside the stack. In order to assess the potential of natural salinity gradients as renewable energy source, progress in the fields of fouling monitoring and controlling is vital. To improve fouling and cleaning monitoring, experiments with sodium dodecylbenzenesulfonate (SDBS) were carried out while at the same time the electrochemical impedance spectroscopy (EIS) was measured at the RED stack level. EIS showed how SDBS affected the ohmic resistance of the stack, the non-ohmic resistance of the AEM and the non-ohmic resistance of the CEM on different time scales. Such detailed investigation into the effect of SDBS on different stack elements offered by EIS is not possible with traditional DC characterization. The results presented in this work illustrate the potential of EIS at the stack level for fouling monitoring. The knowledge presented shows the possibility to include EIS in up-scaled natural salinity gradient RED applications for fouling monitoring purposes.

Effect of Sodium Dodecylbenzene Sulfonate as Anionic Surfactant on Water based Carbon Nanofluid Performance as Quench Medium in Heat Treatment

Quenching is performed as part of steel heat-treatment to enhance mechanical properties, by rapid cooling. Factors that affect the selection of quench medium are hardenability of material, geometry, and dimensions of the component. In recent developments, nanofluids are used to improve heat transfer capacity. In this research, nanofluids were synthesized using the two-step method. Milling of particles was done using a high energy ball mill for 15 hours at 500 rpm. Observation of particle size, material composition, and morphology of particle, and surface changes of the particle were measured by Field-Emission Scanning Electron Microscope (FE- SEM), and Energy Dispersive X-Ray Spectroscopy (EDX). Water-based nanofluids with a volume of 100ml were produced using the two-step method, with carbon concentrations of 0.1%, and 0.5% and Sodium Dodecylbenzene Sulfonate concentrations of 0%, 1%, 3%, and 5%. Samples of S45C steels were austenized at 1000°C for 60 minutes. Hardness testing results correspond to the severity of the quenching mediums, with peak hardness of 845 HV for 0.1% Carbon with 1% SDBS, and 878 HV for 0.5% carbon with 3% SDBS. Hardness testing results show a significant improvement over results without SDBS addition. Excess surfactant addition yields a lower hardness due to the re-agglomeration of particles.

Static sorption of heavy metal ions on ion exchanger in the presence of sodium dodecylbenzenesulfonate

The effect of sodium dodecylbenzenesulfonate (anionic surfactant) on removal of selected heavy metal ions such as copper(II), cobalt(II), zinc(II) and nickel(II) using Lewatit MonoPlus TP 220 were studied. The critical micellization of concentration in the system containing both heavy metal ions and the anionic surfactant was obtained (surface properties). The percentage removal of heavy metal ions in the system without the anionic surfactant was compared with that of heavy metal ions in the presence of the anionic surfactant of the concentration below (↓CMC) and above (↑CMC) (HCl—heavy metal ions—anionic surfactant systems). Moreover, Lewatit MonoPlus TP 220 was applied for the heavy metal ions removal from real wastewaters (used a pickling bath) originating from leaching of the heat-resistant nickel and cobalt alloys. The critical micellization of concentration values depends on the composition of solution, presence of hydrochloric acid and heavy metal ions. The presence of the surfactant improves slightly the removal efficiency of cobalt(II) and nickel(II) ions and deteriorates the zinc(II) removal efficiency. Lewatit MonoPlus TP 220 shows high affinity for copper(II) in the model and real wastewater solutions in the case of the systems without and with the anionic surfactant.

Understanding the enhancement of electrochemical properties of NiCo layered double hydroxides via functional pillared effect: An insight into dual charge storage mechanisms

In terms of the charge storage mechanism of supercapacitors, there are three types, including electrical double layer (EDL), surface redox reaction and intercalation reaction. The surface redox mechanism of transition metal-layered double hydroxides (TM-LDH) supercapacitor had been previously revealed. A dual charge storage mechanism integrated with surface redox and ion intercalation for LDH-based supercapacitors, however, is seldom reported before. For this purpose, here, we synthesized NiCo layered double hydroxide nanosheets via the intrinsic pillar effect of sodium dodecylbenzene sulfonate (NiCo-SDBS-LDH), and found that the surface redox and intercalation behaviors take effect simultaneously in NiCo-SDBS-LDH via electrochemical analysis. The NiCo-SDBS-LDH electrode having a relatively low specific surface area (15.28m2g−1) still exhibited a remarkable specific capacitance of 1094Fg−1 at a scan rate of 5Ag−1, and super long cycle life of 81% retention over 3000 cycles. A dual charge storage mechanism is subsequently proposed based on the analysis of our results to explain the excellent properties of NiCo-SDBS-LDH. We believe that the enhancements should mainly be ascribed to the structural feature of the SDBS stabilized NiCo-LDH and the expanded interlayer space of NiCo-SDBS-LDH. These findings open new doors to functional pillared effect to control the electrochemical behaviors of TM-LDH-based materials.

Effect of Sodium Dodecylbenzenesulfonate on the Association Behavior of Promethazine Hydrochloride in Aqueous/Electrolyte Solutions at Different Temperatures

The interaction between the amphiphilic phenothiazine drug promethazine hydrochloride (PMT) and an anionic surfactant sodium dodecylbenzenesulfonate has been investigated using the conductometric technique in the absence and presence of an inorganic salt (50 mmol·kg−1 NaCl) at five different compositions and temperatures. PMT is employed for the cure of allergic symptoms. Different physicochemical parameters such as critical micellar concentration (cmc), thermodynamic, and micellar composition are evaluated and discussed in detail using regular solution theory (RST). The addition of salt decreased the surface charge of micelles, lowering the cmc values of the amphiphile. The interaction parameter (β) is negative at all temperatures and compositions indicating attractive interactions. Due to the presence of NaCl in mixed systems the attractive interaction (β) was further increased (β values more negative). The negative values of Gibbs energy ( $$ \Delta G^{0}_{\text{m}} $$ ) of mixing revealed the stability of the solution. Owing to the presence of NaCl, the $$ \Delta G^{0}_{\text{m}} $$ values are found to be more negative suggesting that the driving force for interaction was significantly increased and micellization more thermodynamically favorable.

Picolinic Acid Promoted Permanganate Oxidation of D-Mannitol in Micellar Medium

AbstractKinetics of permanganate oxidation of D-mannitol have been investigated spectrophotometrically under pseudo-first-order conditions in aqueous acidic media at 30 °C. The spectral analysis of hydrazone derivative of the product indicates the product to be an aldehyde. The observed rate constant value was found to be relatively slow in the uncatalyzed path, which increases by the presence of four isomeric promoters: 2-picolinic acid (2-PA), 4-picolinic acid (4-PA), 2,3-dipicolinic acid (2,3-diPA) and 2,6-dipicolinic acid (2,6-diPA). The catalytic effect of sodium dodecylbenzene sulfonate (SDBS) surfactant on the permanganate oxidation of D-mannitol has been also studied in the presence of the promoters. The critical micelle concentration (CMC) of SDBS alone and in presence of D-mannitol was determined by conductometry and spectrophotometry. The aggregation and morphological changes during reaction were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The variation of the reaction rates for the different promoters in the presence and absence of SDBS micellar catalyst is discussed qualitatively in the terms of partitioning nature of substrate, charge of surfactant and reactants. 2,3-diPA in association with SDBS as micellar catalyst accelerated the reaction velocity compared to the uncatalyzed path.

Optimisation of Detergent Ingredients for Stain Removal Using Statistical Modelling

AbstractArtificially soiled test fabrics are widely used to study the cleaning performance of detergents formulations. In this study, artificial soiled cotton test fabrics were prepared in the laboratory using carbon black as a model soil. Design of experiments was used to optimise the concentration of detergent ingredients for stain removal. A multi‐factorial analysis of variance was used to model the effect of sodium dodecylbenzene sulfonate, nonylphenol ethoxylate, sodium silicate, sodium citrate and sodium carbonate as builders on soil removal. A colourimetric evaluation using the CIELAB system was used to measure soil removal. In general, performance increases with increasing concentration of surfactant, silicate and soda ash.

Transport of TiO2 nanoparticles in soil in the presence of surfactants

This paper aimed to investigate the influences of surfactants on the nanoparticle transport behavior in soil. The transport behaviors of TiO2 nanoparticles (nTiO2) in soil with three different surfactants, including Triton X-100 (TX-100), sodium dodecylbenzene sulfonate (SDBS) and cationic cetyl trimethylammonium bromide (CTAB) were studied. Results showed that all the three surfactants decreased the mobility of nTiO2 in soil column, which were mainly caused by the strong adsorption of surfactants on soil and nTiO2. The inhibition order was as follows: CTAB>SDBS>TX-100. Combined effect experiments showed that when solution ionic strength (IS) increased, TX-100 or CTAB inhibited the mobility of nTiO2 in soil. However, the effect of SDBS on nTiO2 transport shifted from inhibition to facilitation when IS increased from 0.1 to 5mM. This was mainly attributed to the decreasing adsorption of SDBS on soil with increased IS, whereas the adsorption of TX-100 and CTAB was independent of IS. This innovative information motivates further insight into the role of surfactants on nanoparticle transport behavior in soil.

Effect of Sodium Dodecyl Benzenesulfonate on the Coke Formation during Slurry-Bed Hydrocracking of an Atmospheric Residue from Karamay

The effect of sodium dodecyl benzenesulfonate (SDBS) on the coke formation during slurry-bed hydrocracking of an atmospheric residue from Karamay (KAR) was studied, and three other kinds of surfactants, dodecyl trimethylammonium bromide (DTAB), oleic acid (OA), and coconut amine (CA), were used to compare to SDBS to deduce the reason for SDBS restraining the coke formation. The functional groups on the asphaltene surface and the effects of surfactants on the mean particle diameter of the catalyst, colloidal stability of the reaction system, and adsorptivity of asphaltene were investigated to find the reason for surfactant restraining the coke formation. The results showed that the order of reducing the total coke yield was CA > SDBS > OA ≈ none > DTAB and the order of reducing the coke on the reactor surface (cokesur) was SDBS > OA ≈ none > CA > DTAB. SDBS was the best surfactant to restrain coke formation during slurry-bed hydrocracking of KAR. The effects of surfactants on the colloidal stability of the reaction system were in accordance with the effects of surfactants on the total coke yield, and the effects of surfactants on the adsorptivity of asphaltene were in accordance with the effects of surfactants on cokesur, which meant that SDBS strengthening the colloidal stability of the system and lengthening the induction period of coking were important factors to reduce the total coke yield and restraining the adsorption of asphaltene on the reactor surface is the key factor to reduce cokesur. The analysis of X-ray photoelectron spectroscopy (XPS) data shows that KAR asphaltene is basic and SDBS has an acidic functional group and a suitable straight alkane chain length, making SDBS react with the basic KAR asphaltene particle to realize the effects on the colloidal stability of the reaction system and the adsorptivity of KAR asphaltene.