MOLECULES
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2018
·Vol. 23
·期 6
·1342
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IF 3.098
Yimei Ren,Chang Cui,Pengjie Wang
An anionic adsorbent was prepared by grafting citrate onto pomelo peel (PPL) to remove methylene blue (MB) from aqueous solution. The PPL and modified pomelo peel (MPPL) were analyzed by Fourier transform infrared spectroscopy (FTIR) and observed by scanning electron microscopy (SEM). The effects of dye concentration, contact time, and pH on adsorption were studied. The FTIR results confirmed that the carboxyl groups were successfully bound to cellulose molecules in PPL via modification with citrate. SEM indicated that the surface of PPL became clean and the porous structure was well maintained after modification. The adsorption capacities of MB onto PPL and MPPL were 81.7 mg/g and 199.2 mg/g, respectively, thus indicating that the addition of anionic groups significantly improved the adsorption performance. The increase in the initial dye concentration and pH of the dye solution promoted the adsorption process. The adsorption equilibrium on MPPL required approximately 3 h. The adsorption of MB on MPPL was well described by a pseudo-second order kinetic model and Langmuir isotherm model. The thermodynamic parameters indicated spontaneous and exothermic adsorption. This study suggests that PPL modified with citrate can be used as a sustainable adsorbent in wastewater purification.Keywords:pomelo peel;modification;citric acid;adsorption;methylene blue
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Qian Wang,Junping Ju,Yeqiang Tan,Longyun Hao,Yunliang Ma,Yang Wu,Huawei Zhang,Yanzhi Xia,Kunyan Sui
Herein, the three kinds of water-insoluble alginate-based nanofiber membranes were prepared by electrospinning and followed with crosslinking by calcium chloride (CaCl 2 ), glutaraldehyde vapor (GA), and trifluoroacetic acid (TFA) crosslinking, respectively. All the sodium alginate(SA) nanofiber membranes present excellent integrated adsorption performance toward methylene blue (MB). Among these, CaCl 2 crosslinked SA membranes exhibit the maximum actual adsorption capacity of 2230 mg/g and shortest adsorption equilibrium time of 50 min to date. On the basis of the selective adsorption of SA, the nanofiber membranes can separate MB/ methyl orange (MO) mixture solution and maintain high separation efficiency even after five cycles. In addition, respective applicable condition for differentially crosslinked SA nanofiber membranes was evaluated. The TFA crosslinked membranes have the least reduction in the adsorption capacity in acidic environment and GA crosslinked membranes adsorb better in alkaline environment. For seawater environment, GA crosslinked membranes show obvious adsorption performance than other crosslinked membranes.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Sisi Li,Jun Xu,Guohong Yao,Hui Liu
As a kind of attractive biomaterial, stimuli-responsive hydrogel had been widely used in wound dressings and wearable devices. However, it remained challenging to prepare a hydrogel with both excellent self-adhesion and self-healing performances. Inspired by the adhesion mechanism of mussel, we prepared a self-adhesive, self-healing, and triple-responsive hydrogel by a hybrid system based on tunable composition of polydopamine (PDA) and polymer network composed of poly(N,N-diethylacrylamide-co-acrylic acid). It was found that the resulting hydrogel could be directly adhered to a variety of substrates without the need of external adhesives on account of the existence of enough free catechol groups in the hydrogel. Due to the synergistic effect of PDA nanoparticles and polymer network, hydrogel also showed excellent self-healing property. Moreover, we demonstrated that the triple-responsive hydrogel as an adsorbent could efficiently remove methylene blue, and the maximum adsorption capacity was 305.4 mg/g when the optimum mass fraction of PDA was 0.4 wt % in hydrogel. The adsorption of the hydrogel toward methylene blue could be well simulated by pseudo-second-order model and Langmuir isothermal adsorption model. From the viewpoint of mechanism, methylene blue molecules could be directly adsorbed to these carboxyl, amino and catechol functional groups in the molecular structure of polymeric hydrogels by electrostatic force, π–π interaction, Van Der Waals force, hydrogen bonding, etc. Ultimately, we hoped to extend this hybrid strategy to develop multifunctional hydrogels and consequently broaden the application prospects of hydrogels in biomedical treatment and environmental protection.
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CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2017
·Vol. 30
·期 4
·389-394
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IF 0.498
Ke Da,Sui Lai-zhi,Liu Dun-li,Wang Yu-su,Li Su-yu,Jiang Yuan-fei,Chen An-min,Jin Ming-xing
The mixture of graphene oxide (GO) and dye molecules may provide some new applications due to unique electronic, optical, and structural properties. Methylene blue (MB), a typical anionic dye, can attach on GO via π-π stacking and electrostatic interaction, and the molecule removal process on GO has been observed. However, it remains unclear about the ultrafast carrier dynamics and the internal energy transfer pathways of the system which is composed of GO and MB. We have employed ultrafast optical pump-probe spectroscopy to investigate the excited dynamics of the GO-MB system dispersed in water by exciting the samples at 400 nm pump pulse. The pristine MB and GO dynamics are also analyzed in tandem for a direct comparison. Utilizing the global analysis to fit the measured signal via a sequential model, five lifetimes are acquired: (0.61±0.01) ps, (3.52±0.04) ps, (14.1±0.3) ps, (84±2) ps, and (3.66±0.08) ns. The ultrafast dynamics corresponding to these lifetimes was analyzed and the new relaxation processes were found in the GO-MB system, compared with the pristine MB. The results reveal that the functionalization of GO can alter the known decay pathways of MB via the energy transfer from GO to MB in system, the increased intermediate state, and the promoted energy transfer from triplet state MB to ground state oxygen molecules dissolved in aqueous sample.
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MOLECULAR NEUROBIOLOGY
·
2016
·Vol. 54
·期 3
·2209-2222
·
IF 5.397
Chen Zi-wei,Liu Anmin,Liu Qingyu,Chen Jingkao,Li Wen-ming,Chao Xiao-juan,Yang Qian,Liu Pei-qing,Mao Zi-xu,Pi Rong-biao
Methylene blue (MB) can ameliorate behavioral, neurochemical, and neuropathological impairments in animal models of acute and chronic neurodegenerative disorders, but the underlying mechanism remains unclear. Myocyte enhancer factor 2 (MEF2D) is known to promote neuronal survival in several models, and several survival and death signals converge on MEF2D and regulate its activity. Here, we investigated the role of MEF2D in the neuroprotective effect of MB against glutamate-induced toxicity in HT22 neuronal cells. Our results showed that MB, event at less than 100 nM, improved the viability of HT22 cells exposed to 2 mM glutamate. MB attenuated the mitochondrial impairment and quenches the reactive oxygen species (ROS) induced by glutamate. Surprisingly, MB at 50–200 nM did not affect the Nrf2/HO-1 pathway, an important endogenous anti-oxidative system. Further study showed that MB increased the transcription and translation of MEF2D. In addition, MB upregulated the expression of mitochondrial NADH dehydrogenase 6 (ND6) in a MEF2D-dependent manner. Knockdown of MEF2D abolished both MB-medicated increase of ND6 and MB-induced neuroprotection against glutamate-induced toxicity. Moreover, we showed that MB promoted Akt function activity, suppressed GSK-3β activity, and increased MEF2D level in hippocampus of mice and HT22 cells. These findings for the first time demonstrate that MB protects HT22 neuronal cells against glutamate-induced cell death partially via the regulation of MEF2D-associated survival pathway.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jiao Shan,Liyuan Wang,Zhanfang Ma
In this work, a kind of novel redox-active species, metal-organic nanocomposites with uniform morphology and good conductivity, was synthesized by one-pot method using HAuCl 4 as oxidant and methylene blue as monomer. With excellent biocompatibility of Au, the immunosensing probe was fabricated by means of immobilization of antibody on the nanocomposites for the purpose of signal amplification. Meanwhile, graphene-Au modified electrode was used as the substrate. A new electrochemical immunosensing platform was designed and simply fabricated. With the use of α-fetoprotein (AFP) as a model analyte, good performance was obtained with a wide linear range from 1 pg mL −1 to 100 ng mL −1 , and low detection limit of 19.6 fg mL −1 . The assay results of clinical serum with this immunoassay were well consistent with those obtained from ELISA method. The present work suggested an electrochemical immunosensing platform for tumor biomarker.
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RSC Advances
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2016
·Vol. 6
·期 110
·108240-108246
·
IF 3.289
Zhenzhen Wei,Yinli Liu,Hongmei Hu,Jianyong Yu,Faxue Li
The burgeoning electrospinning technology brings about a diversity of nanofibers and promotes their applications in various fields including wastewater treatment. Herein, we fabricated biodegradable poly(butylene succinate-co-terephthalate) (PBST) nanofibrous membranes by electrospinning for the first time and functionalized them with β-cyclodextrin polymer (CDP) through the in situ polymerization of CDP on the surface of PBST nanofibrous membranes. Furthermore, there was much higher efficiency in removing methylene blue (MB) dye on the resultant PBST/CDP nanofibrous membranes than that on pure CDP, or PBST nanofibrous membrane. The adsorption performance of the composite membranes to MB molecules was influenced greatly by the amount of CDP that dominated the surface area and surface morphologies of the prepared membranes. The adsorption kinetics of PBST/CDP nanofibrous membrane fitted well with the pseudo-second order model and Langmuir isotherm model well described the relationship between the adsorption capacity and initial MB solution concentration, exhibiting the maximum adsorption capacity of 90.9 mg g−1, which was much higher than the adsorption capacity of the other adsorbents. Considering the excellent adsorption performance of the as-prepared material, the PBST/CDP nanofibrous membranes is a promising candidate in environmental purification applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2014
·
IF 3.065
Ji-Ming Song,Cheng-Cheng Liu,Song-Song Zhang,He-Lin Niu,Chang-Jie Mao,Sheng-Yi Zhang,Yu-Hua Shen
Adsorption is an effective method of removing contaminants from water, however, desorption often becomes more difficult after adsorption process, due to the strong binding force between the adsorbent and pollutants, so that the desorbent cannot be reused. In this paper, Co 0.85 Se nanosheets prepared through a hydrothermal reaction have been used to remove cationic dye methylene blue from aqueous solution in the presence of sodium borohydride. The results show that adsorption/desorption properties of the Co 0.85 Se nanosheets to MB can be greatly changed in the presence/absence of sodium borohydride (NaBH 4 ), and the equilibration time of the adsorption/desorption depends on the amount of NaBH 4 . When NaBH 4 or Co 0.85 Se nanosheets existed together, the residual quantity of MB in solution was less than one-twentieth of that in the system alone using either NaBH 4 or Co 0.85 Se nanosheets; while a large number of MB (ca.90%) was released once again into the solution after NaBH 4 was decomposed because of catalysis of Co 0.85 Se. The zeta potential and pH tests have been elucidated the mechanism for the adsorption of MB onto Co 0.85 Se nanosheets. The efficient adsorption and recovery of dyes indicate that the prepared Co 0.85 Se nanosheets have potential application in wastewater treatment under the assistance of NaBH 4 .
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CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Rongping Chen,Yinlong Zhang,Lianfeng Shen,Xiaoyan Wang,Jianqiang Chen,Aijun Ma,Weimin Jiang
A novel biodegradable adsorbent: starch-humic acid composite hydrogel beads (ST-HA), was prepared via inverse suspension crosslinking method in this study. Adsorptive removal of Pb(II) and MB using ST-HA in respective single-component and binary systems were studied. ST-HA showed efficient removal of Pb(II) and MB. The adsorption of Pb(II) and MB on ST-HA was pH dependent with uptake dropping in acidic solutions. The adsorption mechanisms of Pb(II) and MB were also different, the latter involves π–π interactions besides ion exchanging. It was also observed that ST-HA can selectively remove MB in acidic solutions. The adsorption equilibrium study indicated that the adsorptions of Pb(II) and MB were monolayer and spontaneous processes. The adsorption kinetics followed pseudo-second-order equation and activation energy calculation indicated that the adsorption was a chemical process. Furthermore, ST-HA could be easily regenerated and reused with little loss of adsorption capacity. Overall, ST-HA is an efficient and versatile adsorbent for Pb(II) and MB removal.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Jianwei Fu,Zhonghui Chen,Minghuan Wang,Shujun Liu,Jinghui Zhang,Jianan Zhang,Runping Han,Qun Xu
Polydopamine (PDA) microspheres were synthesized by a facile oxidative polymerization method and used as a high-efficiency adsorbent for the removal of a cationic dye (methylene blue, MB) from aqueous solution. Characterizations of the as-synthesized PDA microspheres and PDA microspheres-MB (MB absorbed PDA microspheres) systems were performed using several techniques such as SEM, TEM, FTIR, N 2 adsorption/desorption isotherms, particle size and zeta potential analysis. The effects of initial solution pH, temperature, initial concentration, and contact time were systematically investigated. Results showed the adsorption capacity at 25 °C could reach up to 90.7 mg/g. Besides, adsorption kinetics showed that the adsorption behavior followed the pseudo-second-order kinetic model. The equilibrium adsorption data fitted the Langmuir isotherm well. Thermodynamic analyses showed that the adsorption was endothermic and spontaneous, and it was also a physisorption process. In addition, the possible adsorption mechanism was also proposed based on the experimental results.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fan Wang,Lijuan Zhang,Yeying Wang,Xijian Liu,Sohrab Rohani,Jie Lu
The graphene oxide (GO) functionalized by Fe 3 O 4 @SiO 2 @CS-TETA nanoparticles, Fe 3 O 4 @SiO 2 @CS-TETA-GO, was firstly fabricated in a mild way as a novel adsorbent for the removal of Cu(II) ions and methylene blue (MB) from aqueous solutions. The magnetic composites showed a good dispersity in water and can be conveniently collected for reuse through magnetic separation due to its excellent magnetism. When the Fe 3 O 4 @SiO 2 @CS- TETA-GO was used as an absorbent for the absorption of MB and Cu(II), the adsorption kinetics and isotherms data well fitted the pseudo-second-order model and the Langmuir model, respectively. Under the optimized pH and initial concentration, the maximum adsorption capacity was about 529.1 mg g −1 for MB in 20 min and 324.7 mg g −1 for Cu(II) in 16 min, respectively, exhibiting a better adsorption performance than other GO-based adsorbents reported recently. More importantly, the synthesized adsorbent could be effectively regenerated and repeatedly utilized without significant capacity loss after six times cycles. All the results demonstrated that Fe 3 O 4 @SiO 2 @CS-TETA-GO could be used as an excellent adsorbent for the adsorption of Cu(II) and MB in many fields.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xinyi Wan,Yingqing Zhan,Zhihang Long,Guangyong Zeng,Yi He
Design and fabrication of structurally optimized absorbents are important for wastewater treatment such as dyes and heavy metals removal. Herein, we reported the core@double-shell structured magnetic halloysite nanotube nano-hybrid absorbent with target micro-structure and high efficiency removal capacity of dyestuffs. Our core@double-shell structured absorbent consisted of a halloysite nanotube as skeleton, an intermediate magnetic nanoparticles coating with more specific surface area and magnetic separation property, and poly(DA + KH550) derivate layer outside provided active adsorption sites. This well-defined core@double-shell configuration was quite distinct from conventional core-shell or hybrid structures. The integrated advantages of HNTs skeleton, Fe 3 O 4 nanoparticles inner shell and poly(DA + KH550) outside shell contributed to the high adsorption capacity of methylene blue (up to 714.29 mg g −1 ) and excellent cycling stability. Furthermore, the novel core@double-shell structured absorbent exhibited better removal efficiency for methylene blue in solution with high pH, and the adsorption process can be described by using the pseudo-second-order model. More importantly, the recycling process of adsorbents was more energetically and economically sustainable by using a permanent magnet. The characteristic high removal capacity, cycling stability and easy separation made core@double-shell structured absorbent promising for the efficient removal of dyestuffs from the wastewater.
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