Materials Chemistry Frontiers
·
2021
·Vol. 6
·期 1
·103-116
·
IF 6.482
Li Yu,Tiantian He,Jia Yao,Wendi Xu,Shuping Peng,Pei Feng,Cijun Shuai
Developing a novel antibacterial material with highly effective and long-lasting antibacterial activity to prevent bacterial infection during or post bone scaffold transplantation is an urgent need for bone regeneration. In this study, a synergistic antibacterial system for a polyglycolic acid (PGA) scaffold was constructed by cation exchange of montmorillonite (MMT) with Cu2+ and then intercalation of cetyltrimethylammonium bromide (CTAB) into the interlayer of MMT. On one hand, the introduced Cu2+ enlarged the interlayer spacing of MMT, facilitating the intercalation of CTAB into the MMT interlayer to impart the antibacterial effect. On the other hand, the intercalation of CTAB into MMT shifted the surface potential of MMT from negative to positive, improving the bacterial adsorption capacity by electrostatic forces so that Cu2+ could act directly on the negatively charged bacteria. As a result, the bacterial adsorption rate of Cu2+ and CTAB modified MMT (Cu-CMMT) improved by 76.5% compared with that of MMT, which could be explained by the increased zeta potential from −26.1 to 19.7 mV. Besides, the scaffold with Cu-CMMT exhibited robust antibacterial activities against E. coli with an antibacterial rate of 98.1%, which was significantly higher than that of the scaffold with Cu2+ or CTAB modified MMT individually. The scaffold with Cu-CMMT exhibited the highest level of reactive oxygen species (ROS), which was attributed to the dilapidation of bacterial cells.
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SENSORS
·
2013
·Vol. 13
·期 1
·758-768
·
IF 1.953
Qing Lu,Weina Zhang,Zhihui Wang,Guangxia Yu,Yuan Yuan,Yikai Zhou
A facile electrochemical sensor for the determination of nonylphenol (NP) was fabricated in this work. Cetyltrimethylammonium bromide (CTAB), which formed a bilayer on the surface of the carbon paste (CP) electrode, displayed a remarkable enhancement effect for the electrochemical oxidation of NP. Moreover, the oxidation peak current of NP at the CTAB/CP electrode demonstrated a linear relationship with NP concentration, which could be applied in the direct determination of NP. Some experimental parameters were investigated, such as external solution pH, mode and time of accumulation, concentration and modification time of CTAB and so on. Under optimized conditions, a wide linear range from 1.0 × 10−7mol·L−1to 2.5 × 10−5mol·L−1was obtained for the sensor, with a low limit of detection at 1.0 × 10−8mol·L−1. Several distinguishing advantages of the as-prepared sensor, including facile fabrication, easy operation, low cost and so on, suggest a great potential for its practical applications.Keywords:nonylphenol (NP);cetyltrimethylammonium bromide (CTAB);determination;electrochemical sensor
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JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
Yu Tian,Yunfang Li,Jie Mei,Bin Deng,Yuxiu Xiao
A novel catanionic surfactant vesicle system, formulated from hexafluoroisopropanol (HFIP), cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS), was developed as pseudostationary phase (PSP) in electrokinetic chromatography (EKC). HFIP, as an organic modifier with the prominent properties of ionization, hydrogen bond donor and hydrophobicity, was used to effectively promote the spontaneous vesicle formation from CTAB/SDS mixed aqueous solutions, where precipitates are easy to occur due to long carbon chains, and adjust the performance of CTAB/SDS vesicles. The physical features (size and viscosity) and electrophoretic parameters (electroosmotic mobility, electrophoretic mobility and elution range) of HFIP-modified CTAB/SDS vesicles were characterized as HFIP volume content (0–4%, v/v), CTAB/SDS molar ratio (2:8–7:3 mol/mol) and total surfactant concentration (10–50 mM) varying, respectively. The 3% v/v HFIP-modified CTAB/SDS (3:7 mol/mol, 50 mM) vesicle system proves to have the largest mean diameter (288.20 nm) and the widest elution range (12.41), which is also much wider than that of the corresponding other four PSP systems including trifluoroethanol (TFE)-modified CTAB/SDS vesicles (5.69), isopropanol-modified CTAB/SDS micelles (2.03), HFIP-modified SDS micelles (4.86) and unmodified SDS micelles (3.12). The chromatographic performance of the HFIP-modified vesicle system was evaluated by separating eight polycyclic aromatic hydrocarbons, nitrotoluene positional isomers, five positively charged and five negatively charged/neutral drugs, respectively. Baseline or near-baseline separation was achieved for each series of solutes. Compared with the TFE-modified vesicle system, as well as the HFIP-modified and unmodified SDS micelle systems, the HFIP-modified vesicle system shows the best separation selectivity, the highest or comparable efficiency, and the lowest retention.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Yun Shi,Jiada Du,Tingman Zhao,Bo Feng,Haohao Bian,Shengdao Shan,Jun Meng,Peter Christie,Ming Hung Wong,Jin Zhang
Nanoplastics (NPs) pollution has become an emerging threat to the aquatic environment and its organisms. The removal of NPs from contaminated water is a global challenge. In this study, an efficient and reusable composite was prepared from cetyltrimethylammonium bromide (CTAB) modified magnetic biochar. The performances of CTAB modified magnetic biochar (CMB) to remove polystyrene (PS) and carboxylate-modified polystyrene (CPS) nanoparticles from water were systematically evaluated. The results showed that the PS and CPS removal performance of magnetic biochar was improved by CTAB modification. These increases were assigned to the increase in the surface hydrophobicity of CMB. Due to the strong electrostatic repulsion between the nanoparticles, PS and CPS maintained high stability in alkaline conditions, resulting in a significant decrease in removal efficiency. The removal efficiency was decreased to 67.4% for PS and to 40.7% for CPS at pH 11. The inhibition effects of NaCl on the PS and CPS removal efficiencies were decreased gradually with the increase of NaCl concentration. Among the anions studied, H 2 PO 4 − had the biggest impact on the removal performance of CMB. Besides, CMB could be used to remove PS and CPS in real surface water, and the removal efficiencies of PS and CPS were 95.3% and 97.8%, respectively. Particularly, the removal efficiencies of PS and CPS were 90.2% for PS and 94.8% for CPS when CMB was recycled five times. According to the characterization results of XRD, TGA , SEM , FTIR and XPS , PS and CPS nanoparticles were removed by CMB from water mainly through aggregation instead of adsorption. The efficient removal of PS and CPS by CMB via aggregation process offers new insight into the removal of NPs from aquatic environment.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Feifei Lu,Guanjun Ding,Xiaoyu Ma,Biao Huang,Lijun You
Magnetic chitosan (CS) cross-linked gelatin (Gel) polymer composites (MCGC) were fabricated by reacting CS with Gel in the present of carboxyl modified Fe 3 O 4 nanoparticles and cetyltrimethylammonium bromide using glutaraldehyde as a crosslinking agent. MCGC possessed high zeta potential, abundant active functional groups including amino and hydroxyl groups and facile magnetic separation properties. The prepared MCGC exhibited excellent adsorption performance for AR 18 and the adsorption capacity reached as high as 344.63 mg/g. The adsorption kinetics was fitted well with the pseudo-second order model, while the adsorption isotherms followed the Redlich-Peterson equation best. The thermodynamic studies indicated the adsorption process was exothermic and spontaneous. The adsorption mechanism was studied including electrostatic interaction, hydrogen-bond interaction and π-π stacking between dyes and MCGC. Desorption and renewable experiments proved MCGC possessed high regeneration properties and reusability as an adsorbent.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Chaoling Bao,Xiuqiong Chen,Chang Liu,Yue Liao,Yi Huang,Lin Hao,Huiqiong Yan,Qiang Lin
The cellulose nanocrystals (CNCs) synthesized by sulfuric acid hydrolysis are highly hydrophilic and prone to form the agglomerations due to the hydrogen bonding , which limit their applications in the formulations of Pickering emulsions . For this reason, we selected microcrystalline cellulose (MCC) as the raw material for the extraction of CNCs through sulfuric acid hydrolysis and hydrogen peroxide oxidation , and then combined the surfactants of cetyltrimethylammonium bromide (CTAB) and CNCs to prepare the (O/W) Pickering emulsions by high-speed shearing method. The physicochemical properties of the resultant CNCs were evaluated by scanning electron microscopy (SEM), atomic force microscope (AFM), transmission electron microscopy (TEM), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA). The formed emulsions were characterized by fluorescent microscope (FM). And the effects of the CTAB concentration, pH and ionic strength on the stability of the formed Pickering emulsions were also investigated. Experimental results showed that the sulfuric acid hydrolysis of MCC induced the removal of the amorphous components and the cleavage of the crystalline microfibrils, making CNCs exhibit the curled and rod-like shape with the average hydrodynamic diameter of 460.5 nm (PDI = 0.585), zeta potential of -34.1 mV and the crystallinity index (CrI) of 77.3 %, which revealed good colloidal properties . In addition, the optimal emulsification conditions for CTAB concentration, pH and ionic strength were respectively 0.5 CMC , 11 and 20∼60 mmol/L. On the basis of the above results, the Pickering emulsions stabilized by CTAB/CNCs complex may have potential for large applications in foods, cosmetics and medicines.
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BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Cheng Cai,Xueqing Qiu,Xuliang Lin,Hongming Lou,Yuxia Pang,Dongjie Yang,Siwei Chen,Kaifan Cai
Two pretreatment methods to overcome recalcitrance of lignocelluloses, sulfite pretreatment (SPORL) and dilute acid (DA), were conducted to pretreat softwood masson pine and hardwood eucalyptus for enzymatic hydrolysis. In the presence of corresponding pre-hydrolysates, adding moderate cetyltrimethylammonium bromide (CTAB) could enhance the enzymatic hydrolysis of the SPORL-pretreated substrates, but had no enhancement for the DA-pretreated substrates. The results showed that sodium lignosulfonate (SL) in pre-hydrolysates and CTAB together had a strong enhancement on the enzymatic hydrolysis of lignocelluloses. The compound of commercial lignosulfonate SXSL and CTAB (SXSL-CTAB) could enhance the substrate enzymatic digestibility (SED) of SPORL-pretreated masson pine from 27.1% to 71.0%, and that of DA-pretreated eucalyptus from 37.6% to 67.9%. The mechanism that CTAB increased the adsorption of SL on lignin to form more effective steric hindrance and reduced the non-productive adsorption of cellulase on lignin by neutralizing the negative charge of SL was proposed.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2016
·Vol. 32
·期 6
·992-995
·
IF 1.086
Liu Lihong,Wang Chunfeng,Zhuo Kelei
A sensitive electrochemical sensor for determining bisphenol A(BPA) was designed. The sensor was a glassy carbon electrode modified with the surfactant cetyltrimethylammonium bromide and the ionic liquid 1-decyl-3-methylimidazolium tetrafluoroborate. The ability of the new sensor to measure BPA was investigated in cyclic voltammetry experiments. Under optimized conditions, the sensor gave a linear response range for BPA of 2.19×10 −7 ―3.28×10 −5 mol/L and a detection limit of 7.31×10 −8 mol/L( S/N =3). BPA could be determined with a lower detection limit, a wider linear range, and more sensitivity using the sensor than using other electrochemical sensors or high performance liquid chromatography with UV detection. The new sensor was used to determine BPA in tap water with recoveries of 97.5%―98.7% and a relative standard deviation <2.9%. The results show that the sensor can be used to determine trace BPA concentrations in tap water.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Zhongjian Li,Min Yao,Jun Lin,Bin Yang,Xingwang Zhang,Lecheng Lei
The selective sorption of pentachlorophenol (PCP) in a multiple solute system provides the possibility of using the cetyltrimethylammonium bromide (CTMAB)/bentonite one-step process as a promising technique for hydrophobic organics removal from wastewater. The PCP sorption mechanism, especially the effects of coexisting solutes, was studied. Compared to raw bentonite and conventional CTMAB modified organobentonite, the one-step process exhibited higher PCP removal efficiency. In a single solute system, the PCP sorption isotherm implied that the dominating sorption mechanism is a partition mechanism. The logarithms of sorption coefficients (Kd) for different organics are linearly related to the logarithm of their octanol–water partition coefficients (Kow). In a multiple solutes system, phenol and 2,4-dichlorophenol (2,4-DCP) could effectively enhance PCP sorption. The PCP sorption coefficient increases in the order: PCP/phenol < PCP/2,4-DCP < PCP/phenol/2,4-DCP. The PCP sorption enhancement is likely resulted from the interlayer space expansion and the organic carbon content increase. On the basis of the comparison between the single and the multiple solute systems, phenol and 2,4-DCP sorption coefficients decrease in the order: Kd of a single solute system > Kd of a binary solute system > Kd of a ternary solute system, and no enhancement for phenol and 2,4-DCP sorption was observed.
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Materials Research Express
·
2020
·Vol. 7
·期 8
·085008
·
IF 1.929
Fulu Ai,Guohua Zhao,Wu Lv,Jie Lin
We report the synthesis of cetyltrimethylammonium bromide (CTAB)-loaded mesoporous silica nanoparticles (MSNs) as efficient anticancer agents. The chemical composition and structure, drug loading capacity, and in vitro cytotoxicity of CTAB-MSNs were analyzed. Our results reveal that CTAB-MSNs display a uniform pore structure, extensive surface area, and high drug-loading capacity, of approximately 37.2% by weight. The viability assessments showed that CTAB-MSNs exhibited superior human hepatoma (HepG2) cell killing compared to free CTAB. Therefore, CTAB-MSNs may have advantages over conventional cancer therapies.
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Analytical Methods
·
2015
·Vol. 7
·期 9
·3849-3854
·
IF 1.821
Xia Hao,Zhen Xu,Na Li,Nian Bing Li,Hong Qun Luo
A simple and sensitive electrochemical method for the detection of cetyltrimethylammonium bromide (CTAB) by cation exchange processes has been developed. The rationale for the amperometric CTAB assay is essentially based on the different binding affinities of polystyrene sulfonate (PSS) toward electrochemically active acridine orange (AO) and electrochemically inactive CTAB. The stronger binding affinity of the PSS toward CTAB than toward AO essentially validates the amperometric CTAB assay through a cation exchange mechanism with the decrease in the redox peak current of AO adsorbed on the PSS. Because of the different binding affinities between PSS and cationic surfactants with different lengths of the alkyl chain, this method can be used to detect quaternary ammonium surfactants with similar structures. The difference value of the anodic peak current showed a linear relationship with the CTAB concentration in a concentration range from 0.5 to 20 μg mL−1 and a detection limit of 0.3 μg mL−1 was obtained. More importantly, this detection method has been successfully applied to the detection of CTAB in real samples.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Jing Zhang,Xiaojian Xu,Lu Chen
This work constructed an ultrasensitive electrochemical bisphenol A (BPA) sensor using hierarchical Ce-metal-organic framework (Ce-MOF) modified with cetyltrimethylammonium bromide (CTAB) as a sensing platform. Ce-MOF had been successfully prepared and conveniently modified with a cationic surfactant (CTAB) via the electrostatic interaction. Ce-MOF and CTAB/Ce-MOF were characterized by scanning electron microscopy, X-ray diffraction, infrared spectrum, thermogravimetric analysis and zeta potentials analysis. CTAB/Ce-MOF suspension was dropped onto glassy carbon electrode (GCE) surface to fabricate CTAB/Ce-MOF/GCE. Combined with preconcentration of BPA of the long alkane chain in CTAB via hydrophobic interaction and electrocatalytic activity of Ce-MOF, the dual amplification made CTAB/Ce-MOF/GCE exhibit high electrochemical response toward the oxidation of BPA, and an electrochemical BPA sensor was constructed based on CTAB/Ce-MOF/GCE by differential pulse voltammetry. The designed BPA sensor had a wide linear range from 0.005 to 50 μmol L −1 and a low detection limit of 2.0 nmol L −1 (S/N = 3). The proposed sensor had excellent reproducibility, stability and anti-interference, and was successfully employed for BPA detection in real samples. This convenient and sensitive sensor proved to be a promising and reliable tool for detecting BPA in food and environmental pollution.
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