RSC Advances
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2018
·Vol. 8
·期 57
·32565-32573
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IF 2.936
Shaojun Yang,Daliang Liu,Qing Bo Meng,Shuyao Wu,Xi-Ming Song
In this paper, a hybrid nanocomposite (MB-rGO) was synthesized based on the π–π stacking interactions between methylene blue (MB) and reduced graphene oxide (rGO). The as-synthesized nanocomposite was characterized by SEM, TEM, XRD, FTIR, UV-vis and XPS spectra. UV-vis spectroscopy and electrochemical tests suggested the MB-rGO modified on the electrode exhibited glucose oxidase-mimetic catalytic activity towards glucose, and displayed excellent electrocatalytic performance for electrochemical detection of glucose with a wide linear range from 1.04 to 17.44 mM, a low detection limit of 45.8 μM and a large sensitivity of 13.08 μA mM−1 cm−2. The proposed glucose sensor also showed high stability, reproducibility and good abilities of anti-interference to dopamine, ascorbic acid and uric acid. Moreover, the modified electrode was used to determine glucose concentration in human blood serum samples with satisfactory results.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2018
·Vol. 26
·期 8
·3362-3370
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IF 1.971
Zhou Kaixuan,Li Yanhui,Li Qi,Du Qiuju,Wang Dechang,Sui Kunyan,Wang Cuiping,Li Hongliang,Xia Yanzhi
A novel aerogel (β-CD/AC) was prepared through polymerization reaction of β-cyclodextrin (β-CD) with activated carbon (AC) and vacuum freeze drying method. The structure and morphology of β-CD/AC were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) method and thermogravimetric analysis (TGA). β-CD/AC is used to deal with wastewater containing methylene blue (MB) dye. The effects of AC content in β-CD/AC, pH value, temperature, contact time and amount of adsorbent on the adsorption of MB were studied in detail. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The Langmuir monolayer adsorption capacity of MB onto β-CD/AC was estimated as 166.67 mg/g. The kinetics of MB onto β-CD/AC was well described by the pseudo-second order model. The thermodynamic parameters indicated that the adsorption reaction of MB onto β-CD/AC was endothermic and spontaneous.
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CHEMICAL ENGINEERING JOURNAL
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2015
·
IF 4.321
Feng Liu,Hailiang Zou,Jinwen Hu,Hongbo Liu,Jianbing Peng,Yanwu Chen,Fenghui Lu,Yingpeng Huo
Soy protein isolate (abbreviated as SPI) was chemically immobilized on deacetylated konjac glucomannan (abbreviated as DKGM) in the current work. The obtained porous SPI/DKGM composite beads were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR) and zeta potential analysis. Adsorption performances of porous SPI/DKGM composite beads were tested to remove methylene blue from aqueous solution. Benefiting from the combined merits of SPI, high adsorption capacity and fast adsorption of methylene blue (MB) by porous SPI/DKGM composite beads are achieved. The maximum methylene blue adsorption capacities were shown to be 272.4 mg g −1 for porous SPI–DKGM composite beads. These results confirm that the porous SPI–DKGM composite beads have a potential for methylene blue removal from wastewater.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2014
·
IF 1.761
Xia Wan,Rui Ma,Shaolong Tie,Sheng Lan
The tin dioxide (SnO 2 ) nanocrystals were synthesized by direct precipitation method and a series of SnO 2 samples were obtained via calcining SnO 2 at different temperatures. The characteristics of SnO 2 samples were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), Brunauer Emmett Teller (BET), photoluminescence spectroscopy (PL), and UV–vis diffuse reflectance spectroscopy (DRS). The effects of calcination temperatures and additives on the photodegradation of methylene blue (MB) on SnO 2 samples under UV-light irradiation have been researched. The results showed that the SnO 2 sample with low temperature-treated ( T ≤200 °C) exhibits the highest degradation efficiency, while with increasing temperature-treated (from 400 °C to 1000 °C) SnO 2 samples show decreasing degradation activities. The additives, such as methanol, sodium fluoride, Fe(III), Ag + , and terephthalic acid showed different influences on MB degradation in UV/SnO 2 systems. It has been demonstrated that in SnO 2 -MB systems both hydroxy radicals (OH ) generated on the surface of SnO 2 and photogenerated holes (h + vb ) in the valence band (VB) of SnO 2 jointly control the photo-oxidation process of MB. In SnO 2 system with increasing temperature-treated ( T ≥400 °C) the contribution of OH to MB degradation gradually decreased due to the diminution of surface-bonding hydroxyl groups (–OH) and chemisorbed water (H 2 O) molecules on the surface of SnO 2 , by comparison, the contribution of h + vb increased. The effects of Ag + and Fe(III) species on MB degradation and the formation of OH were investigated in detail and the mechanisms have been discussed. The presence of Ag + ion at low concentration promotes the degradation of MB by capturing the photogenerated electrons (e cb − ) on the surface of SnO 2 catalyst, suppressing the recombination of photogenerated electrons and holes. The presence of Ag + ion at high concentration observably reduces the degradation in catalyst system which the photodegradation process is controlled by OH , conversely, it intensively promotes the degradation in which the photodegradation process is controlled by h + vb . The effects of Fe(III) species on the degradation are similar to those of Ag + ions.
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RSC Advances
·
2015
·Vol. 5
·期 50
·39964-39972
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IF 3.84
Fubo Gu,Man Liang,Dongmei Han,Zhihua Wang
Two multifunctional sandwich-like mesoporous silica–graphene oxide (GO@mSiO2) and mesoporous silica–Fe3O4–graphene oxide (Fe3O4/GO@mSiO2) adsorbents were synthesized, and the adsorption equilibrium and kinetics of methylene blue on both of them were investigated. The structural and physical properties of the adsorbents were investigated by transmission electron microscopy, X-ray diffraction, vibrating magnetometry, nitrogen adsorption–desorption measurement and their chemical properties were analyzed by X-ray photoelectron spectroscopy, infrared spectroscopy, and Raman spectroscopy. GO@mSiO2 exhibited a high specific surface area of 634 m2 g−1 and its maximum adsorption capacity for methylene blue was 305.3 mg g−1. The specific surface and the maximum adsorption capacity were 179 m2 g−1 and 125.1 mg g−1 to Fe3O4/GO@mSiO2, which could be recycled by using an external magnetic field because of its magnetic property. Moreover, both adsorbents exhibited photothermal properties. A second-order kinetic equation could best describe the adsorption kinetics. Thermodynamic parameters indicated that the adsorption of methylene blue onto both adsorbents was thermodynamically feasible and could occur spontaneously.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2015
·
IF 4.152
Leilei Li,Feng Liu,Huimin Duan,Xiaojiao Wang,Jianbo Li,Yanhui Wang,Chuannan Luo
The hydroxy-functionalized ionic liquids (ILs) modified with magnetic chitosan/grapheneoxide (MG-ILs-OH) were synthesized. The surface morphology of MG-ILs-OH was characterized by transmission electron microscopy, X-ray diffraction, thermo gravimetric analysis and Fourier transform infrared spectroscopy techniques. It was found that the adsorption kinetics is well fitted by a pseudo-second-order model and the adsorption isotherms agree well with the Langmuir model, and the MG-ILs-OH could be repeatedly used by simple treatment. The results showed that the addition of ILs-OH can largely increase the adsorption sites (hydroxy and amino groups) and adsorption properties. The MG-ILs-OH were used as adsorbent for the removal of methylene blue (MB) and Cr(VI) from simulated wastewater with a fast solid–liquid separation in the presence of external magnetic field. The maximum obtained adsorption capacities of MB and Cr(VI) were 243.31 and 107.99 mg/g, respectively. The application of MG-ILs-OH could effectively solve the problem that the adsorbent only adsorb similar adsorbate.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 6
·986-994
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IF 1.024
Zhao Rui,Li Xiang,Sun Bolun,Li Yumei,Li Yanzi,Wang Ce
Sericin(SS), as an abundant and renewable resource in nature, has been proven to be a good adsorbent for metal ions or organic dyes removal. In this study, glutaraldehyde vapor cross-linked sericin-based electrospun fiber adsorbent was developed for the removal of methylene blue(MB) from wastewater. To overcome the problem of decreasing adsorption capacity by excessive functional group cross-linking, MB-imprinted sericin/poly(vinyl alcohol) (PVA) electrospun fiber adsorbent was prepared. Biocompatible PVA was added to the electrospinning solution to improve the spinnability and mechanical property. Scanning electron microscopy(SEM), Fourier transforms infrared spectroscopy(FTIR), and so forth were used to confirm their structures and composition. The adsorption performance toward the template molecule MB, including pH effect, adsorption isotherm, adsorption kinetics, adsorption selectivity, and reusability, was investigated. By comparison with non-imprinted sericin/PVA electrospun fibers, MB-imprinted sericin/PVA electrospun fiber adsorbent showed an enhanced and selective adsorption capacity toward MB with a good regeneration and recycling ability. The adsorption test suggests that the resulting MB-imprinted sericin/PVA electrospun fibers are promising adsorbents for MB removal from aqueous system.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
·
IF 3.014
Lin Wang,Haoshuang Gu,Jian He,Tingting Zhao,Xuewen Zhang,Chuan Xiao,Hui Liu,Xianghui Zhang,Yuebin Li
The adsorption and photodegradation performance are of paramount importance to photocatalysts in environmental hazards, especially in serious organic pollutants leaking emergency in the absence of natural light illumination. Here we demonstrated a surface ligand assisted localized crystallization (SLALC) method to scale synthesis of cubic phase NaNbO 3 (c-NaNbO 3 ) photocatalyst at a low temperature as 350 °C. The as synthesized c-NaNbO 3 nanoparticles could adsorb 95% of methylene blue (MB) in 3 min and photodegrade 99.3% of MB in 180 min. Moreover, the as prepared c-NaNbO 3 nanoparticles exhibit both outstanding adsorption and photodegradation recoverability, which shows great potential in actual environmental conservation.
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Desalination and Water Treatment
·
2024
·
IF 1
Chaoliang Wang,Xiaoyang Zhao,Yongjun Li,Dehu Yang,Fuyang Liu,Feng Liu,Li Li,Ping Ke
A series of simple and low-cost Ca-doped g-C 3 N 4 (Ca/CN-X) photocatalysts were fabricated through a two-step calcination method for photodegradation of methylene blue (MB) simulated dyeing wastewater. The results showed that the photodegradation efficiency of Ca/CN-15 % on MB removal under visible light was 97.7 %, and the degradation rate constant was 4 times that of CN, showing the best photocatalytic performance. This was attributed to the fact that the doping of Ca expanded the absorption band edge, reduced the band gap, and suppressed the photogenerated electron-hole recombination, thereby increasing its corresponding photocatalytic activity. A possible photodegradation mechanism was explored, and it was found that h + was the main active species during the process. The above indicated that Ca/CN-X can be regarded as a promising catalyst for dyeing wastewater treatment.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xingmei Tang,Wenhua Gao,Sheng Duan,Jun Xu,Bin Wang,Jinsong Zeng
Activated carbon is a porous material extensively utilized in water treatment field . In this study, an efficient activated carbon (E-AC) adsorbent was prepared from agricultural by-product Camellia oleifera shells (COS) by enzymatic pretreatment combined with phosphoric acid activation. The enzymatic pretreatment was beneficial for increasing the volume of mesopores and loosening the structure of the synthesized activated carbon, which ultimately led to an increased adsorption capacity of E-AC. The characteristics and adsorption performances of E-AC were thoroughly investigated. The results showed that E-AC exhibited a high adsorption capacity of 1249.01 mg/g on methylene blue (MB), and the adsorption process was a spontaneous endothermic process. The adsorption kinetics aligned closely with the pseudo-second-order kinetic model (R 2 > 0.99), and the adsorption mechanisms could be a combination of hydrogen bonding, π-π conjugation, electrostatic attraction, and physical adsorption. Additionally, E-AC exhibited good reusability, with a consistent MB removal rate of 91.14 % even after five cycles. This study offered an approach for obtaining high-quality activated carbon from COS and contributed to sustainable development strategies.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 34
·15149-15157
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IF 2.7
Jinpu Zhang,Xiaoyu Wang,Ruihan Du,Siyang Sun,Shuyi Yu,Chunli Kang
Graphitic carbon nitride (gCN) has shown great potential in photocatalysis. Developing suitable cocatalysts is a critical way to enhance gCN's photocatalytic performance. In this paper cobalt–nickel bimetallic phosphide (CoNiP) was used as a cocatalyst to modify gCN. A gCN/CoNiP composite was successfully prepared by a simple hydrothermal method. XRD, XPS, SEM, UV-vis DRS, and PL characterization studies showed that a Schottky junction-like structure was constructed between gCN and CoNiP, which intensified the visible light response, enhanced the charge transfer rate and prohibited the recombination of photogenerated carriers, thus significantly improving gCN photocatalytic activity. Under simulated sunlight, the removal efficiency of methylene blue (10 mg L−1) was 97.8% by 120 min of irradiation, 44.6% higher than that of gCN. The quenching experiment showed that ˙O2−, ˙OH and h+ were the main active species. Based on the above points, the possible mechanism of photocatalysis was deduced.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 23
·10463-10474
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IF 2.7
Jingyu Zhao,Yunlong Shi,Yue Liu,Jiayi Zhang,Yuhong Qin,Xiaomao Song,Qiang Lin,Changjiang Yu,Anqi Shang,Yuxiao Fei
Sodium alginate, a bio-friendly and abundant precursor of biochar (BC), was employed to prepare biochar@Co catalysts (BC@Co). A series of catalysts was synthesised at different temperatures via a one-step carbothermal method with the aim of activating peroxymonosulfate (PMS) to degrade methylene blue (MB). For the BC@Co-T (T = 500–900 °C) catalysts, the degradation process of MB by PMS was consistent with the first-order reaction kinetics model, with reaction rate constants of 0.0471–0.8041 min−1. In particular, the composite prepared at 900 °C (BC@Co-9) delivered the best PMS activation performance. Using the BC@Co-9–PMS system, the effects of various factors, including the catalyst dosage, PMS concentration, and coexisting ions, on the MB degradation rate were investigated. Under the optimal conditions of 0.005 g L−1 BC@Co-9 and 0.6 mmol L−1 PMS, the degradation rate of MB reached 100% in 18 min. Quenching experiments and electron paramagnetic resonance (EPR) measurements showed that 1O2 and ˙O2− were predominantly responsible for the degradation of MB in the BC@Co-9–PMS system. This study explored the application of sodium alginate as a recycled material and provides a feasible strategy for designing and fabricating environmentally friendly and efficient catalysts for the activation of PMS to degrade organic dyestuffs.
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