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Effect of an anionic surfactant on Hydraulic Conductivities of Sodium- and Calcium-Saturated Soils

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Pedosphere 2006年第5期16卷 673-680页

作者： RAO Pin-Hua HE Ming YANG Xian ZHANG You-Chi SUN Shou-Qin WANG Jiang-Sheng Department of Resource and Environmental Sciences Shanghai Jiaotong University Shanghai 201101 （China） Design Department of Binnan Oil Production Plant SINOPEC Shengli Oilfield Company Binzhou 256606 （China）

The effect of sodium dodecylbenzenesulfonate (SDBS), an anionic surfactant used widely in household products and industrial processes, on saturated hydraulic conductivities (Ksat) of an Anthrosol saturated with sodium (Na-soil) or calcium (Ca-soil) was analyzed in a laboratory experiment using the constant head method, and adsorption and dispersion experiments were also conducted to infer the possible mechanisms of Ksat fluctuations. The results showed that SDBS was more intensely adsorbed in the Ca-soil than in the Na-soil. With an increase in the SDBS concentration, the stability of the Na-soil suspensions decreased when the SDBS concentration was less than 1.2 mmol L-1 and then above this concentration, increased markedly, while the stability of the Ca-soil suspensions increased gradually at all SDBS concentrations studied. With an increase in the SDBS concentration, the Ksat of the Na-soil increased, which resulted mainly from the increase of water channels in the soil because of the coagulation of the soil particles, while the Ksat of Ca-soil decreased mainly on account of the clogging of partial water channels by precipitated Ca(DBS)2 and the fine soil particles generated.

关键词： adsorption anionic surfactant calcium-saturated soil hydraulic conductivity sodium-saturated soil

High Selective Determination of anionic surfactant Using Its Parallel Catalytic Hydrogen Wave

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Chinese Journal of Chemistry 2003年第12期21卷 1630-1635页

作者：过玮何盈盈宋俊峰 Department of Chemistry Northwest University

A faradaic response of anionic surfactants (AS),such as linear alkylbenzene sulfonate (LAS),dodecyl benzene sulfonate and dodecyl sulfate,was observed in weak acidic medium. The faradaic response of AS includes (1) a catalytic hydrogen wave of AS in HAc/NaAc buffer that was attributed to the reduction of proton associated with the sulfo-group of AS,and (2) a parallel catalytic hydrogen wave of AS in the presence of hydrogen peroxide,which was due to the catalysis of the catalytic hydrogen wave of AS by hydroxyl radical ·OH electrogenerated in the reduction of hydrogen peroxide. The parallel catalytic hydrogen wave is about 50 times as sensitive as the catalytic hydrogen wave. Based on the parallel catalytic hydrogen wave,a high selective method for the determination of AS was developed. In 0.1 mol/L HAc/NaAc (pH=6.2±0.1)/1.0×10 -3 mol/L H_2O_2 supporting electrolyte,the second-order derivative peak current of the parallel catalytic hydrogen wave located at -1.33 V (vs. SCE) was rectilinear to AS concentration in the range of 3.0×10 -6 —2.5×10 -4 mol/L,without the interference of other surfactants. The proposed method was evaluated by quantitative analysis of AS in environmental wastewater.

关键词： anionic surfactant linear alkylbenzene sulfonate hydrogen peroxide parallel catalytic hydrogen wave

Differences in Adsorption of anionic surfactant AOT by Calcium Oxalate： Effect of Crystal Size and Crystalline Phase

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Chemical Research in Chinese Universities 2016年第4期32卷 682-688页

作者： SkIN Xinyuan DING Yiming WEN Xiaoling OUYANG Jianming Institute of Biomineralization and Lithiasis Research Jinan University Guangzhou 510632 P. R. China

The adsorption of anionic surfactant sodium diisooctyl sulfosuccinate（AOT） onto calcium oxalate mono- hydrate（COM） and dihydrate（COD） with sizes of 50, 100 nm, 1, 3 and 10 μm was comparatively studied to simulate the interaction between urinary crystallites and urine components. The adsorption quantity of different concentrations of AOT onto COD and COM with different sizes was detected using a UV-Vis spectrophotometer. The crystalline phase transition of COM and COD before and after adsorption was analyzed by X-ray powder diffraction and Fourier transform infrared spectrometry. The zeta potential of the crystal surface after adsorption of different concentrations of AOT was measured using a zeta potential analyzer. The adsorption quantity of AOT on COM and COD with different sizes was ranked in the following order： 50 nm〉100 nm〉1μm〉3 μm〉10 μm. The adsorption quantity of COM was greater than that of COD with the same size because the density of the positive charges on the COM surface was higher than that on COD surface. With the increase of AOT concentration, the adsorption curves of the large-sized COM and COD（3 and 10μm） were S-type, whereas the adsorption curves of the small-sized COM and COD（50 nm, 100 nm and 1μm） were linear. The adsorption capacities of small-sized COM and COD were much greater than those of the 3 and 10μm crystals. On the basis of the above results, we proposed a molecular model to summarize the absorption of AOT onto COM and COD crystals. Small crystals exhibit a large specific surface area and high surface energy. Thus, the adsorption capacities of them are stronger than those of large crystals. Overall, this study implies that small crystals can easily absorb anionic molecules in urine and may easily adhere to a negatively charged cell surface, thereby increasing the severity of cell injury.

关键词： Crystal size Calcium oxalate anionic surfactant Surface adsorption Adsorption model

Synthesis of Silica Hollow Spheres with Diameter Around 50 nm by anionic surfactant

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Chemical Research in Chinese Universities 2012年第3期28卷 361-363页

作者： RAN Hua HAN Lu CHE Shun-ai State Key Laboratory of Composite Materials Thin Film and Microfabrication Technology of Ministry of EducationSchool of Chemistry and Chemical TechnologyShanghai Jiaotong UniversityShanghai 200240P.R.China

Silica hollow spheres（SHSs） have attracted great attention because of their low toxicity, low density, large surface area, high chemical and thermal stability, and surface permeability. They can be widely applied in storage^[l], catalysis^[2], drug deli- very^[3,4], low-dielectric-constant materials^[5], low-refractive materials^[6-8], and so on. Up to now, there have been various methods to produce SHSs. Inorganic^[9] or organic particles^[10], such as polystyrene or calcium carbonate, were used as hard templates to create hollow cavities, However, the multistep synthetic process and the lack of structural robustness of the shells upon template removal process weaken their applica- tion. Soft templates, including oil-in-water emulsions^[11,12], vesicles^[13], micelle^[14,15] and gas bubbles^[16], are applied widely.

关键词： anionic surfactant Co-Structure directing agent(CSDA) Vesicle

Phase Separation and Microstructure of Mixed surfactants Solution Containing Cationic Geminis and Traditional anionic surfactant

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Chinese Journal of Chemical Engineering 2004年第4期12卷 486-492页

作者：尚亚卓刘洪来胡英 Department of Chemistry State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Department of Chemistry State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 Chinahe properties of aqueous two-phase system (ATPS) of mixed solution containing gemini cationic surfactant trimethylene-13-bis(dodecyldimethyl ammonium) bromide (12-3-12 2Br-) and traditional anionic surfactant sodium dodecyl sulfate (SDS) with or without added salt have been studied. An ATPS is formed in a narrow region of the ternary phase diagram different from that of traditional aqueous cationic-anionic surfactant systems. In ATPS region the lowest total concentration of surfactants varies with the mixing ratio of geminis to SDS. Photographs obtained from freeze-etching negative-staining and transmission electron microscopy show that the microstructures of two phases are different from each other. Micelles and vesicles can coexist in a single phase. The addition of salts can change the phase diagram of ATPS. Furthermore the added salts promote the aggregation of rod-like micelles to form coarse network structure that increase the viscosity of solutions. The negative ions of the added salts are the determining factor.

The properties of aqueous two-phase system (ATPS) of mixed solution containing gemini cationic surfactant trimethylene-1,3-bis(dodecyldimethyl ammonium) bromide (12-3-12, 2Br-) and traditional anionic surfactant sodium dodecyl sulfate (SDS) with or without added salt have been studied. An ATPS is formed in a narrow region of the ternary phase diagram different from that of traditional aqueous cationic-anionic surfactant systems. In ATPS region, the lowest total concentration of surfactants varies with the mixing ratio of geminis to SDS. Photographs obtained from freeze-etching, negative-staining and transmission electron microscopy show that the microstructures of two phases are different from each other. Micelles and vesicles can coexist in a single phase. The addition of salts can change the phase diagram of ATPS. Furthermore, the added salts promote the aggregation of rod-like micelles to form coarse network structure that increase the viscosity of solutions. The negative ions of the added salts are the determining factor.

关键词： cationic gemini surfactant anionic surfactant aqueous two-phase system microstructure

Development and Prospect of China’s anionic surfactant Industry

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China Detergent & Cosmetics 2020年第2期5卷 18-22页

作者： Fang Yinjun Zou Huanjin Li Zhonghong Hua Wengao Zanyu Technology Group Co. Ltd.China

The development process of anionic surfactants in China was *** current status of anionic surfactants in China was *** overall situation of sulfonation equipment was introduced,and the development trend of anionic sur... 详细信息

关键词： anionic surfactant sulfonation market development

Mercury removal from aqueous solution using petal-like MoS_(2) nanosheets

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Frontiers of Environmental Science & Engineering 2021年第1期15卷 213-222页

作者： Ragini Pirarath Palani Shivashanmugam Asad Syed Abdallah MElgorban Sambandam Anandan Muthupandian Ashokkumar Department of Chemistry National Institute of TechnologyTiruchirappalli-620015India Department of Chemical Engineering National Institute of TechnologyTiruchirappalli-620015India Department of Botany and Microbiology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia School of Chemistry University of MelbourneMelbourneVic-3010Australia

Recently,different nanomaterial-based adsorbents have received greater attention for the removal of environmental pollutants,specifically heavy metals from aqueous *** this work,we synthesized few-layered MoS2 nanosheets via a surfactant-assisted hydrothermal method and utilized them as an efficient adsorbent for the removal of mercury from aqueous *** synthesized MoS2 nanosheets showed petal-like morphology as confirmed by scanning electron microscope and high-resolution transmission electron microscopic *** average thickness of the nanosheets is found to be about 57 *** high stability and negative zeta potential makes this material suitable for efficient adsorption of mercury from aqueous *** adsorption efficiency of the adsorbent was investigated as a function of pH,contact time and adsorbent *** kinetics of adsorption and reusability potential of the adsorbent were also performed.A pseudo-second-order kinetics for mercury adsorption was *** prepared MoS_(2) nanosheets showed 93%mercury removal efficiency,whereas regenerated adsorbent showed 91%and 79%removal efficiency in the respective 2^(nd) and 3^(rd) *** adsorption capacity of the adsorbent was found to be 289 mg/g at room temperature.

关键词： anionic surfactant 2D material MoS_(2)nanosheets Mercury removal Adsorption capacity

Evaluating the potential of surface-modified silica nanoparticles using internal olefin sulfonate for enhanced oil recovery

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Petroleum Science 2020年第3期17卷 722-733页

作者： Afaque Ahmed Ismail Mohd Saaid Abdelazim Abbas Ahmed Rashidah M.Pilus Mirza Khurram Baig Petroleum Engineering Department Universiti Teknologi PETRONASSeri IskandarMalaysia Center of Research in Enhanced Oil Recovery Universiti Teknologi PETRONASSeri IskandarMalaysia Department of Physics University of OkaraOkaraPunjabPakistan

Recently,nanoparticles have proven to enhance oil recovery on the core-flood scale in challenging high-pressure high-temperature *** generally appear to improve oil production through wettability alteration and reduction in interfacial tension between oil and water ***,they are environmentally friendly and cost-effective enhanced oil recovery *** the rheological properties of nanoparticles is critical for field *** instability of nanoparticle dispersion due to aggregation is considered as an unfavorable phenomenon in nanofluid flooding while conducting an EOR *** this study,wettability behavior and rheological properties of surface-treated silica nanoparticles using internal olefins sulfonates(IOS20–24 and IOS19–23),anionic surfactants were *** modification effect on the stability of the colloidal solution in porous media and oil recovery was *** rheology of pure and surfacetreated silica nanoparticles was investigated using a HPHT *** and particle size distributions of pure and coated silica nanoparticles were studied using a field emission scanning electron microscope.A series of core-flood runs was conducted to evaluate the oil recovery *** coated silica nanoparticles were found to alter rheological properties and exhibited a shear-thinning behavior as the stability of the coated silica nanoparticles could be improved *** low shear rates,the viscosity slightly increases,and the opposite happens at higher shear ***,the surfacemodified silica nanoparticles were found to alter the wettability of the aqueous phase into strongly water-wet by changing the contact angle from 80°to 3°measured against glass slides representing sandstone ***–water IFT results showed that the surface treatment by surfactant lowered the oil–water IFT by 30%.Also,the viscosity of brine increased from 0.001 to 0.008 Pa s by introducing SiO2 nano

关键词： Silica nanoparticles anionic surfactant Rheological properties of nano fluids Wettability alteration Enhanced oil recovery

Effect of SDBS on interfacial electron transfer at the liquid/liquid interface by thin layer method

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Chinese Chemical Letters 2009年第9期20卷 1115-1118页

作者： Xiu Hui Liu Cun Wu Dong Kai Zhang Fu Peng Zhi Zhen Ding Xiao Quan Lu College of Chemistry & Chemical Engineering Northwest Normal University Lanzhou 730070 China

The effect of an adsorbed anionic surfactant sodium dodecyl benzene sulfonate （SDBS） on electron transfer （ET） reaction between ferricyanide aqueous solution and decamethylferrocene （DMFc） located on the adjacent organic phase was investigated for the first time by thin layer method. The adsorption of SDBS at the interface resulted in a decay in the cathodic plateau current of bimolecular reaction with increasing concentrations of SDBS in aqueous phase. However, the rate constant of electron transfer （ket） increased monotonically as the SDBS concentrations increased from 0 to 200 p, moFL. The experimental results showed that SDBS formed patches on the interface and influenced the structure of electrical double layer. 2009 Xiao Quan Lu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： anionic surfactant Liquid/liquid interface Electron transfer Thin layer method