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Wanguo Hou - One of the best experts on this subject based on the ideXlab platform.
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Rough glass surface-mediated transition of micelle-to-vesicle in Sodium Dodecylbenzenesulfonate solutions.
The journal of physical chemistry. B, 2015Co-Authors: Ruiying Song, Xiaoyu Zhu, Shue Song, Wanguo HouAbstract:In this paper, we report a micelle-to-vesicle transition in aqueous solution of the anionic single-tailed surfactant (STS) Sodium Dodecylbenzenesulfonate (SDBS), with the mediation of a rough glass surface (RGS) in the absence of cosurfactants or additives. This transition produced a mixed solution of vesicles and micelles. Interestingly, the obtained SDBS vesicles in the solution displayed good stability during a long-term storage (at least 6 months at room temperature), exposure to high temperature (80 °C for 2 h), and freeze–thawing (−20 or −196 °C for 2 h to approximately 25 °C) after the RGS was removed. Our results confirmed that SDBS could adsorb on the RGS to form bilayers, in which the molecular packing parameter of SDBS was in the range of 1/2–1. The bilayer adsorption and the roughness of the solid surface played an important role in the vesicle formation. In addition, we propose a possible mechanism for the RGS-mediated transition of micelle-to-vesicle in SDBS solutions: SDBS micelles and mole...
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Rough Glass Surface-Mediated Transition of Micelle-to-Vesicle in Sodium Dodecylbenzenesulfonate Solutions B
The Journal of Physical Chemistry, 2015Co-Authors: Ruiying Song, Xiaoyu Zhu, Shue Song, Wanguo HouAbstract:In this paper, we report a micelle-to-vesicle transition in aqueous solution of the anionic single-tailed surfactant (STS) Sodium Dodecylbenzenesulfonate (SDBS), with the mediation of a rough glass surface (RGS) in the absence of cosurfactants or additives. This transition produced a mixed solution of vesicles and micelles. Interestingly, the obtained SDBS vesicles in the solution displayed good stability during a long-term storage (at least 6 months at room temperature), exposure to high temperature (80 °C for 2 h), and freeze–thawing (−20 or −196 °C for 2 h to approximately 25 °C) after the RGS was removed. Our results confirmed that SDBS could adsorb on the RGS to form bilayers, in which the molecular packing parameter of SDBS was in the range of 1/2–1. The bilayer adsorption and the roughness of the solid surface played an important role in the vesicle formation. In addition, we propose a possible mechanism for the RGS-mediated transition of micelle-to-vesicle in SDBS solutions: SDBS micelles and molecules adsorb on the RGS to form curved bilayers; the curved bilayers detach from the RGS, and then close to form vesicles.
Ruiying Song - One of the best experts on this subject based on the ideXlab platform.
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Rough glass surface-mediated transition of micelle-to-vesicle in Sodium Dodecylbenzenesulfonate solutions.
The journal of physical chemistry. B, 2015Co-Authors: Ruiying Song, Xiaoyu Zhu, Shue Song, Wanguo HouAbstract:In this paper, we report a micelle-to-vesicle transition in aqueous solution of the anionic single-tailed surfactant (STS) Sodium Dodecylbenzenesulfonate (SDBS), with the mediation of a rough glass surface (RGS) in the absence of cosurfactants or additives. This transition produced a mixed solution of vesicles and micelles. Interestingly, the obtained SDBS vesicles in the solution displayed good stability during a long-term storage (at least 6 months at room temperature), exposure to high temperature (80 °C for 2 h), and freeze–thawing (−20 or −196 °C for 2 h to approximately 25 °C) after the RGS was removed. Our results confirmed that SDBS could adsorb on the RGS to form bilayers, in which the molecular packing parameter of SDBS was in the range of 1/2–1. The bilayer adsorption and the roughness of the solid surface played an important role in the vesicle formation. In addition, we propose a possible mechanism for the RGS-mediated transition of micelle-to-vesicle in SDBS solutions: SDBS micelles and mole...
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Rough Glass Surface-Mediated Transition of Micelle-to-Vesicle in Sodium Dodecylbenzenesulfonate Solutions B
The Journal of Physical Chemistry, 2015Co-Authors: Ruiying Song, Xiaoyu Zhu, Shue Song, Wanguo HouAbstract:In this paper, we report a micelle-to-vesicle transition in aqueous solution of the anionic single-tailed surfactant (STS) Sodium Dodecylbenzenesulfonate (SDBS), with the mediation of a rough glass surface (RGS) in the absence of cosurfactants or additives. This transition produced a mixed solution of vesicles and micelles. Interestingly, the obtained SDBS vesicles in the solution displayed good stability during a long-term storage (at least 6 months at room temperature), exposure to high temperature (80 °C for 2 h), and freeze–thawing (−20 or −196 °C for 2 h to approximately 25 °C) after the RGS was removed. Our results confirmed that SDBS could adsorb on the RGS to form bilayers, in which the molecular packing parameter of SDBS was in the range of 1/2–1. The bilayer adsorption and the roughness of the solid surface played an important role in the vesicle formation. In addition, we propose a possible mechanism for the RGS-mediated transition of micelle-to-vesicle in SDBS solutions: SDBS micelles and molecules adsorb on the RGS to form curved bilayers; the curved bilayers detach from the RGS, and then close to form vesicles.
Seishiro Ito - One of the best experts on this subject based on the ideXlab platform.
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mgo sub x submonolayer formation on tio sub 2 and its effect on the photocatalytic oxidation of Sodium Dodecylbenzenesulfonate
Journal of The Electrochemical Society, 2000Co-Authors: Hiroaki Tada, Miwako Yamamoto, Seishiro ItoAbstract:A magnesium oxide (MgO{sub x}) layer has been formed on TiO{sub 2} particles by a method consisting of irreversible adsorption of [Mg(acac){sub 2}](process 1) and the subsequent oxidation (process 2). The quantitative analysis of X-ray photoelectron spectroscopic data indicate that the MgO{sub x} submonolayer grows into a monolayer upon seven-time repetition of process 1 and 2. Coating TiO{sub 2} with the MgO{sub x} submonolayer (coverage {approx_equal}0.5) increases the point of zero charge from 7.5 to 8.7 and significantly enhances TiO{sub 2} photocatalytic oxidation of Sodium Dodecylbenzenesulfonate (DBS). The kinetic analyses reveal that the submonolayer coverage increases both the adsorption equilibrium constant (K) and the rate constant for surface oxidation of DBS. The increase in K can be attributed to the electrostatic attraction between the surface (Mg{sub s}-OH{sub 2}{sup +}) and DBS{sup {minus}} anions.
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MgO{sub x} submonolayer formation on TiO{sub 2} and its effect on the photocatalytic oxidation of Sodium Dodecylbenzenesulfonate
Journal of The Electrochemical Society, 2000Co-Authors: Hiroaki Tada, Miwako Yamamoto, Seishiro ItoAbstract:A magnesium oxide (MgO{sub x}) layer has been formed on TiO{sub 2} particles by a method consisting of irreversible adsorption of [Mg(acac){sub 2}](process 1) and the subsequent oxidation (process 2). The quantitative analysis of X-ray photoelectron spectroscopic data indicate that the MgO{sub x} submonolayer grows into a monolayer upon seven-time repetition of process 1 and 2. Coating TiO{sub 2} with the MgO{sub x} submonolayer (coverage {approx_equal}0.5) increases the point of zero charge from 7.5 to 8.7 and significantly enhances TiO{sub 2} photocatalytic oxidation of Sodium Dodecylbenzenesulfonate (DBS). The kinetic analyses reveal that the submonolayer coverage increases both the adsorption equilibrium constant (K) and the rate constant for surface oxidation of DBS. The increase in K can be attributed to the electrostatic attraction between the surface (Mg{sub s}-OH{sub 2}{sup +}) and DBS{sup {minus}} anions.
Pedro M. Álvarez - One of the best experts on this subject based on the ideXlab platform.
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Sodium Dodecylbenzenesulfonate Removal from Water and Wastewater. 1. Kinetics of Decomposition by Ozonation
Industrial & Engineering Chemistry Research, 2000Co-Authors: Fernando J. Beltrán, Juan F. García-araya, Pedro M. ÁlvarezAbstract:Ozonation experiments were conducted to investigate the Sodium Dodecylbenzenesulfonate (NaDBS) removal from aqueous solution and domestic wastewater. The influence of pH and tert-butyl alcohol concentration, a known scavenger of hydroxyl radicals, on the ozonation rate was observed. The degradation rate was especially fast at pH 10 in the absence of hydroxyl radical scavengers. The rate constants of the reactions NaDBS−ozone and NaDBS−hydroxyl radical were found to be 3.68 and 1.16 × 1010 M-1·s-1, respectively. Organic matter in wastewater competes with NaDBS for both dissolved ozone and hydroxyl radical, resulting in a decrease in the overall removal rate of the surfactant. COD and TOC were not completely removed from the wastewater due to an ozone-resistant fraction which remained after the treatment. Nevertheless, the ability of ozone to cause alteration in the molecular structures of dissolved compounds resulted in an increase of the wastewater biodegradability, demonstrated by the increase of the BOD...
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Sodium Dodecylbenzenesulfonate Removal from Water and Wastewater. 2. Kinetics of the Integrated Ozone-Activated Sludge System
Industrial & Engineering Chemistry Research, 2000Co-Authors: Fernando J. Beltrán, Juan F. García-araya, Pedro M. ÁlvarezAbstract:A batch-activated sludge process (AS) has been applied to eliminate Sodium Dodecylbenzenesulfonate (NaDBS), a linear alkylbenzenesulfonate (LAS) compound, from synthetic and real domestic wastewater. The kinetics of surfactant biodegradation was best described by first-order kinetics with rate constants of 1.28 and 1.15 L·(g VSS·day)-1 for synthetic and real domestic wastewater, respectively. The effect of preozonation on the overall surfactant and COD removal rates was also studied. The results indicated that treatment by combined ozone−AS leads to negligible foam ability and low residual surfactant concentration and COD in the treated effluent. Acclimation of a mixed culture to ozonated products was beneficial to highly improve biodegradation rates after preozonation. Thus, when applying ozone at a dose of 100 mg·L-1, the first-order surfactant biodegradation rate constant increased up to 1.79 and 3.09 L·(g VSS·day)-1 for synthetic and real wastewater, respectively. Continuous experiments of ozonation f...
Taek Seung Lee - One of the best experts on this subject based on the ideXlab platform.
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Selective adsorption of Sodium Dodecylbenzenesulfonate from a Cs ion mixture by electrospun mesoporous silica nanofibers.
Chemosphere, 2020Co-Authors: Wonho Noh, Kune-woo Lee, Tae Hyeon Kim, Taek Seung LeeAbstract:Abstract Sodium Dodecylbenzenesulfonate (SDBS) is commonly used to remove radioactive nuclides such as Cs ions during decontamination of shut-down nuclear power plants. Potential environmental problems still remain because of the incomplete removal of large amounts of SDBS from radioactive liquid waste. For the first time, mesoporous silica nanofibers (MSFs) were fabricated for an efficient SDBS separation. MSFs were prepared by electrospinning using tetraethyl orthosilicate, a surfactant, and a template polymer; the product had a large surface area, a high pore volume, and a uniform pore size distribution. The internal pores or external surface were modified with quaternary ammonium salt, providing affinity to water and an electrostatic interaction with SDBS. The MSF-based adsorbent had excellent adsorption ability for SDBS (158.98 mg/g) over conventional adsorbents. In addition, the MSF-based adsorbent could selectively adsorb SDBS from a mixed solution of SDBS and Cs ions. Judging from the Freundlich pseuso second-order kinetic adsorption, the adsorption isotherm indicated that the SDBS adsorption was a kind of multilayer physisorption.
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Cesium ion-exchange resin using Sodium Dodecylbenzenesulfonate for binding to Prussian blue.
Chemosphere, 2019Co-Authors: Eunbee Cho, Kune-woo Lee, Jeong Jun Lee, Byung Sik Lee, Bongjun Yeom, Taek Seung LeeAbstract:Radioactive Cs ions are extremely harmful to the human body, causing cancers and other diseases. Treatments were performed on radioactive Cs present in wastewater after use in industrial or medical fields. Prussian blue (PB) has been widely used for the removal of Cs ions from water but its colloidal structure hinders reuse, making it problematic for practical use. To solve this problem, we used a commercial macroporous polymer resin as a PB matrix. To provide an efficient anchor for PB, the surface of the polymer resin was decorated with Sodium Dodecylbenzenesulfonate to produce a negatively charged surface. The successful chemical binding between the polymer resin and PB prevented leakage of the latter during adsorption and crosslinked structure of the matrix provided regeneration of the adsorbent. The adsorbent maintained its removal efficiency after five repeats of the regeneration process. The PB-based, Cs ion-exchange resin showed excellent selectivity toward Cs ions and good reusability, maintaining its high adsorption capacity.
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Removal of Sodium Dodecylbenzenesulfonate using surface-functionalized mesoporous silica nanoparticles
Microporous and Mesoporous Materials, 2019Co-Authors: Daewon Kim, Jongho Kim, Kune-woo Lee, Taek Seung LeeAbstract:Abstract Sodium Dodecylbenzenesulfonate (SDBS) is widely used as an efficient detergent in various fields. It is also used to remove radioactive atoms including Cs ions, and as a result, Cs-bound SDBS are generated during a nuclear decontamination process. A silica-based adsorbent with mesopores was prepared and surface-functionalized with amine groups to have a positively-charged pocket for SDBS with electrostatic attraction. The removal of SDBS using such an adsorbent was investigated under various conditions. The removal of high SDBS concentration (more than 2000 ppm) was successfully carried out using both a mesoporous structure and electrostatic attraction. The effects of the initial SDBS concentration, the concentration of adsorbent, the SDBS adsorption time, and the pH in the adsorption of SDBS with the mesoporous silica-based adsorbent were investigated in detail. In addition, the adsorption of Cs ion-bound SDBS was investigated for a practical decontamination process, implying that the adsorbent did not remove Cs ions together with SDBS.
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Removal of Sodium Dodecylbenzenesulfonate by Macroporous Adsorbent Resins.
Materials (Basel Switzerland), 2018Co-Authors: Jongho Kim, Daewon Kim, Young Jin Gwon, Kune-woo Lee, Taek Seung LeeAbstract:Among the surfactants used for removal of radioactive nuclides generated from nuclear decontamination, Sodium Dodecylbenzenesulfonate (SDBS) is frequently used. A potential environmental problem of incomplete elimination of SDBS from radioactive liquid wastes (RLWs), which contain a high concentration of SDBS and radioactive nuclides, still remains. Removal of SDBS was evaluated by adsorption using commercially available, macroporous polymer-based adsorbents, HP20 and HP2MGL, which are styrene (St)- and methyl methacrylate (MMA)-based crosslinked resin beads, respectively. The effect of the macroporosity and chemical structure of the macroporous adsorbent resins (MARs) on the adsorption behavior was investigated. HP20 did not have any functionality for adsorbing SDBS, but it showed effective adsorption toward SDBS (less than 20 min to reach 90% adsorption), because of the hydrophobic interaction between the phenyl groups in the St unit in HP20 and in the SDBS. The removal of SDBS from a mixed solution of SDBS and Cs ions was investigated to elucidate the adsorption process in an imitation of the sort of RLWs. This investigation suggests that MARs can potentially be used for the removal of SDBS not only from a SDBS solution but also from a mixed solution of SDBS and Cs ions.