RSC Advances
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2017
·Vol. 7
·期 66
·41667-41674
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IF 3.108
Shihan Yan,Hua Zhang,Zhongbo Yang,Mingjie Tang,Mingkun Zhang,Chunlei Du,Hong-Liang Cui,Dongshan Wei
Methylene blue (MB) as an important dye and medicine, has several different crystalline hydrates. These MB hydrates can transform from one to another at different temperatures or humidities. Determination of these hydrates is a big challenge for traditional spectroscopic technologies like infrared spectroscopy (IR) and Raman spectroscopy due to the component and structure similarities among these hydrates. We present a terahertz (THz) spectroscopy technology to differentiate three typical MB hydrates: pentahydrate, dihydrate and anhydrate. The pentahydrate exhibits prominent THz absorption features at 0.84 and 1.68 THz, and the dihydrate exhibits a broad and weak absorption peak at 0.89 THz, while the anhydrate has no obvious characteristic absorption peak at the measured spectral range of 0.2–2.0 THz. The dehydration kinetics of MB hydrates is investigated according to the variation of one of the main THz characteristic absorption peaks of MB pentahydrate with the heating time at different heating temperatures. A clear relation between the dehydration rate and the heating temperature can be fitted by an Arrhenius equation. The fitted activation energy of 64.5 kJ mol−1 is quite consistent with the enthalpy change due to the transformation of MB pentahydrate to MB anhydrate reported in a previous study.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
·
IF 4.233
Yi He,De Bin Jiang,Jie Chen,De Yi Jiang,Yu Xin Zhang
In this research, MnO 2 nanosheets on montmorillonite (MnO 2 nanosheets@MMt) was synthesized by one-pot hydrothermal method and characterized by X-ray diffraction, Fourier transform infrared spectra , nitrogen adsorption and scanning electron microscopy. It was found that honeycomb-like MnO 2 nanosheets vertically grew on the surface of montmorillonite. MnO 2 nanosheets@MMt exhibited high methylene blue (MB) removal rate, which reached 97.7% within 5 min under the condition of pH 2, MnO 2 nanosheets dosage of 0.1 g L −1 and initial dye concentration of 10 mg L −1 . Additionally, the influencing factors such as pH value, amount of MnO 2 nanosheets@MMt, and MB concentration were also investigated in this paper. Results showed the MB degradation process was correlated with pH value, and the MnO 2 nanosheets@MMt achieved MB removal rate of 92.8% within 5 min under pH 11 because of its absorption capacity of MB. The kinetics of the adsorption process complied with the Pseudo-second-order model. The Langmuir model was found to be the most suitable for describing the experimental equilibrium data of MnO 2 nanosheets@MMt. The MnO 2 nanosheets@MMt showed high adsorption capacity of 363.63 mg g −1 for MB dye. The oxidative decomposition of MB was conducted in the presence of MnO 2 nanosheets@MMt in the low pH, finding that the lower the pH was, the faster the degradation rate was. This research demonstrates that MnO 2 nanosheets@MMt has potential applications in wastewater treatment .
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高影响因子
LANGMUIR
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2025
·
IF 3.9
Tanxia Xiang,Dengjie Zhong,Yongxian Zhou,Yunlan Xu,Danli Tang,Wantao Li,Yuanfang Yang,Chunmiao Fan,Jisai Chen
In this study, the MnFe2O4@Co3S4 magnetic nanocomposite was prepared by a two-step hydrothermal method and used to catalyze the ozone oxidation degradation of methylene blue. It was characterized by XRD, EDS, SEM, FT-IR, and XPS. The results showed that the introduction of Co3S4 made MnFe2O4 grow uniformly on Co3S4 nanosheets, which effectively prevented the agglomeration of MnFe2O4. Moreover, MnFe2O4 provided active sites and Mn3+/Mn2+ and Fe3+/Fe2+ cycles for the ozone oxidation process. Not only did Co3S4 provide the active site (Co2+/Co3+) for the ozone oxidation process but also its derived S2–/S22– accelerated the electron transfer rate on the surface of the material, thus improving the efficiency of catalytic ozone oxidation degradation of methylene blue. When the molar ratio of MnFe2O4 to Co3S4 was 6:3 (MnFe2O4@Co3S4-3), the catalytic ozone degradation efficiency of methylene blue was the best, which reached 93.55% in 12 min. The reactive oxygen species in catalytic ozonation degradation of MB were 1O2, O2.–, and ·OH. The MnFe2O4@Co3S4 magnetic nanocomposite is an efficient and stable O3 activator, which maintains high catalytic activity and low metal ion leaching after five cycles, indicating that it has a good application prospect in catalyzing ozone oxidation to degrade organic pollutants.
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FIBERS AND POLYMERS
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2017
·Vol. 18
·期 5
·891-899
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IF 1.113
Wang Yixi,Zhang Chongyang,Zhao Linyan,Meng Guihua,Wu Jianning,Liu Zhiyong
A novel cellulose-based porous adsorbent with high adsorption capacity for methylene blue (MB) was prepared by free radical polymerization methods. The obtained polymer grafting rate and dye removal efficiency are as high as 338.64 % and 97.74 %, respectively, when the dosage of monomer is 4.5 g, the polymerization condition is 3 h at 70 °C. The cellulose-based adsorbent showed high mechanical properties and good flexibility. The Langmuir isotherm model revealed that the maximum theoretical adsorption capacity of this material for methylene blue was 1734.816 mg g-1 at pH 9.0 at 313 K, which is higher than the values observed for other adsorbents. Scanning electron microscopy (SEM) showed that the cellulose-based adsorbent exhibits a typical well-defined porous and interconnected three-dimensional framework structure, which is benefits to dye adsorption. The adsorption kinetics (pseudo first-order, pseudo-second-order, and intraparticle diffusion models) was also studied, and the pseudo-second-order model fitted MB adsorption better than the pseudo-first-order and intraparticle diffusion models at different initial dye concentrations (500-3000 mg l
-1 ). The novel polyacrylic acid-grafted quaternized cellulose (PAA- g -QC) adsorbent is thus potentially useful for the treatment of dye-contaminated wastewater.
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Nanomaterials
·
2024
·Vol. 14
·期 23
·1925
·
IF 4.4
Yi Hu,Hongwei Wang,Xianliang Ren,Fang Wu,Gaobin Liu,Shufang Zhang,Haijun Luo,Liang Fang
Pore structural regulation is expected to be a facile way to enhance the adsorption performance of MXene. In this work, spherical foam composites consisting of Ti3C2Txand sodium alginate (SA) were synthesized via a vacuum freeze-drying technique. By varying the solution volume of Ti3C2Tx, four distinct Ti3C2Tx@SA spherical foams with honeycomb-like and lamellar structures with a pore diameter in the range of 100–300 μm were fabricated. Their methylene blue (MB) adsorption performances were then systematically compared. The results revealed that the honeycomb-like porous-structured spherical foams have a significantly higher adsorption capacity than their lamellar counterparts. Notably, the Ti3C2Tx@SA honeycomb-like porous foam exhibited a remarkable maximum adsorption capacity (qm) of 969 mg/g, positioning it at the forefront of MB adsorbent materials. Respective analysis of the adsorption kinetics, thermodynamics, and isotherm model indicated that this MB adsorption of Ti3C2Tx@SA honeycomb-like porous foam is characterized to be a physical, endothermic, and monolayer adsorption. The Ti3C2Tx@SA honeycomb-like porous foam also demonstrated excellent resistance to ion interference and good reusability, further attesting to its substantial potential for practical applications. X-ray photoelectron spectroscopy (XPS) analysis was employed to elucidate the adsorption mechanism, which was found to involve the synergistic effect of electrostatic adsorption and amidation reaction. This work not only offers new avenues for the development of high-performance adsorption materials but also provides crucial insights into the structural design and performance optimization of porous materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Qinrui Sun,Ning Wang,Guihua Liu,Jingde Li,Xiaohang Du,Shujuan Sun
Dimensionally stable RuO 2 -based anodes have achieved excellent performance in the field of electrochemical treatment of wastewater, however, the high price of Ru hinders its industrial application. Herein, TiO 2 nanotubes-supported RuO 2 with ultralow Ru loading (0.34 wt%) and trace Fe and Mo doping (RuFeMo@TiO 2 ) was prepared as anode for efficient degradation of methylene blue. It shows that Fe and Mo doping reduce the oxidation state of Ru (Ru n+ , n < 4). In addition, the potential electroactive sites of the electrodes are effectively enhanced by Mo doping. While the Fe doping is found to improve the generation of hydroxyl radicals (·OH) and superoxide anion ( O 2 − ), which are the dominant oxidants for the degradation of methylene blue. In result, the RuFeMo@TiO 2 catalyst exhibits high performance towards methylene blue degradation of 97.5 % within 2 hours. It shows that the cooperation of trace transition metals enables efficient degradation of organic dye with ultralow-loaded Ru electrocatalyst, implying a promising application in wastewater treatment.
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APPLIED CLAY SCIENCE
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2024
·
IF 5.3
Jing Jiang,Siyu Deng,Wenhao Kuang,Li Wang,Dong Chen,Yuhong Ma,Wantai Yang
Halloysite nanotubes (Hal) have drawn intensive attentions because of their unique nanotubular structure and large surface area. However, limited adsorption capacity and poor recyclability severely impeded their practical application for water remediation. Herein, to overcome the deficiencies of pristine Hal, we deliberately designed and prepared a series of anhydride and carboxylate functionalized Hal (Hal@PDM-COO − ) via self-stabilized precipitation polymerization. Owing to the merits of both nanotubular structure of Hal and high-density carboxylate ions in the shell layer, the Hal@PDM-COO − possessed a remarkable pH-dependent adsorption performance towards methylene blue ( b -MB). As the solution pH increased from 3 to 11, the sorption capacity increased remarkably from 179.1 to 459.1 mg/g. Furthermore, all sorption processes were better-fitted with pseudo-second-order and Langmuir models, exhibiting a maximum sorption amount of 302.1 mg/g at pH = 7. These results indicate that electrostatic attraction between positive b -MB molecules and negative carboxylate groups plays a dominant role during sorption process, and carboxylate groups distribute homogeneously in the shell layer of Hal@PDM-COO − . More importantly, Hal@PDM-COO − possessed outstanding recyclability, and the removal rate of b -MB kept >95% after five recycle runs. Considering the highly enhanced adsorption capacity, rapid adsorption rate and excellent reusability, the Hal@PDM-COO − showed significant potential for wastewater treatment.
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Materials
·
2024
·Vol. 17
·期 17
·4329
·
IF 3.1
Junpeng Ren,Shijiang Zhang,Yu Wang,Hengxiu Yang
The abundant pore structure and carbon composition of sphagnum peat moss render it a bio-based adsorbent for efficient methylene blue removal from wastewater. By utilizing sphagnum moss sourced from Guizhou, China, as raw material, a cost-effective and highly efficient bio-based adsorbent material was prepared through chemical modification. The structure and performance of the modified sphagnum moss were characterized using SEM, EDS, FTIR, and TGA techniques. Batch adsorption experiments explored the effects of contact time, adsorbent dosage, pH, initial dye concentration, and temperature on adsorption performance. Kinetics, isotherm models, and thermodynamics elucidated the adsorption behavior and mechanism. The modified sphagnum moss exhibited increased surface roughness and uniform surface modification, enhancing active site availability for improved adsorption. Experimental data aligned well with the Freundlich isotherm model and pseudo-second-order kinetic model, indicating efficient adsorption. The study elucidated the adsorption mechanism, laying a foundation for effective methylene blue removal. The utilization of modified sphagnum moss demonstrates significant potential in effectively removing MB from contaminated solutions due to its robust adsorption capability and efficient reusability.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yile Fu,Zina Wang,Tian Tian,Guan Li,Jinghua Gu,Jun Zhou,Sheying Dong
Despite the promising potential of zeolitic imidazole framework-8 (ZIF-8) for dye adsorption, addressing challenges such as aggregation and recycling difficulties remains essential. Herein，a novel three dimensional (3D) carboxymethyl cellulose (CMC), graphene oxide (GO) and ZIF-8 hybrid aerogel (CGZ-3) was prepared via blending ZIF-8 into the CMC-GO matrix. The structure and composition of CGZ-3 were characterized by SEM, FT-IR, TG and XPS. Adsorption experiments were conducted to optimize various parameters affecting the behavior of methylene blue (MB) adsorption. The composite aerogel exhibited an obvious lamellar network structure, with a surface rich in oxygen-containing functional groups such as -OH and -COOH. CGZ-3 demonstrated a rapid adsorption rate for MB, achieving a removal efficiency of 96% within 15 minutes. The entire adsorption process was spontaneous and endothermic, consistent with the pseudo-first-order kinetic model and Langmuir adsorption isotherm model. The maximum theoretical adsorption capacity was 427.35 mg/g at 298 K. Selective adsorptions tests demonstrated high selectivity of the composite aerogel for MB, and dynamic adsorption further confirmed the exceptional adsorption capacity of CGZ-3. After five cycles of adsorption-desorption, the MB removal rate remained above 95%, with an adsorption capacity exceeding 240 mg/g, highlighting the stability and reusability of CGZ-3. Collectively, the CGZ-3 would be a potential material for the adsorptive removal of MB in practical water treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Qin Shi,Jialve Zhang,Zhenjie Duan,Yanqing Wang,Yumin Wu,Yuetao Liu
With the rapid development of science and technology, the discharge of industrial wastewater, especially dye wastewater, has caused great harm to the ecological environment. In response to the pollution caused by cationic organic dyes in industrial wastewater, this study employed free radical polymerization to prepare a new hydrogel adsorbent, PAA-PA-CMC, which exhibits both reusability and a large adsorption capacity. Phytic acid (PA) and carboxymethyl cellulose (CMC) were introduced into the acrylic acid-based polymer network using N, N ‘-methylene-bisacrylamide (MBA) and glycidyl methacrylate (GMA) as cross-linking agents. Phytic acid serves as both a cross-linking agent and an active component in the adsorption of methylene blue cationic dyes. Methylene blue (MB) adsorption experiments demonstrated that PAA-PA-CMC possesses a porous structure and abundant functional groups, primarily utilizing hydrogen bonds and electrostatic interactions for efficient MB adsorption. The adsorption capacity of PAA-PA-CMC for MB can reach 1005.41 mg/g and has good reusability. After 5 cycles, its adsorption efficiency remains at about 85 %. The adsorption behavior of PAA-PA-CMC conforms to the pseudo-second-order kinetic model and the Langmuir isotherm adsorption model, which is a monolayer chemical adsorption. In summary, the PAA-PA-CMC hydrogel prepared in this investigation shows great potential for treating MB dye wastewater.
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Journal of the Taiwan Institute of Chemical Engineers
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2024
·
IF 5.5
Jue Wang,Jia Yu,Mengxiang Li,Yadong Zhang
Background The treatment of dye residue water pollution is a hot research topic, so it is necessary to prepare a resin which can adsorb dye efficiently. Methods The sodium polystyrene sulfonate (PSSNa) were prepared by the sulfonation reaction of styrene resins with concentrated sulfuric acid and applied for Methylene Blue adsorption in wastewater. The structure of PSSNa was characterized by FT-IR, SEM, XPS and XRD. Significant findings The results show that the maximum adsorption capacity is 16.89 mg∙ g −1 . The adsorption processes of Methylene Blue with PSSNa conforms to the pseudo-second-order kinetic model and the Langmuir isotherm adsorption model, which means that the adsorption process follows single-molecular layer adsorption mechanism. The characteristic group (–SO 3 − ) of the exchange resin interacts electrostatic with MB. Good desorption was achieved with 1 mol· L −1 HCl solution, and the resin retained good adsorption capacity after 5 adsorption-desorption cycles. In practical applications, PSSNa exhibits a good removal efficiency for dyes containing MB in lake water. These results provide a reference for the treatment of printing and dyeing wastewater by resin adsorption materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zetian He,Tie Shi,Daimei Chen,Yuxin Wang,Yanmei Feng,Fengshan Zhou,Yilei Li
The extensive use and improper disposal of antibiotics and organic dyes have resulted in their substantial release into the natural environment, posing a grave threat to both the ecological system and human health. This study successfully synthesised an ultra-thin CuZnCr layered ternary hydrotalcite (CuZnCr-LDH) nanosheet, exhibiting remarkable photo-Fenton properties, through a streamlined one-step coprecipitation method. When the ratio of Cu + to Zn 2+ is 2:1, methylene blue (MB) degradation efficiency reaches 96.5 % after 70 min, and that of CIP attains 75 % after 3 h, and the mineralization rate can be as high as 81.3 % and 64.7 %. The key to enhancing its performance is that the ultrathin structure is conducive to carrier migration, a large number of photogenerated electrons are conducive to the recovery of valence states of Cu and Cr ions to promote Fenton reaction cycle, and the rich active species actively participate in the reaction. Furthermore, electron paramagnetic resonance (EPR) signaling and active material capture experiments have shown that photogenerated superoxide radicals (‧O 2 - ), hydroxyl radicals (‧OH) and holes (h + ) as active species play a crucial role in the degradation process. And the cyclic pattern of the high-priced metal was verified by X-ray photoelectron spectroscopy (XPS) testing, which is a key factor in the photo-Fenton synergy. Based on the experimental results, the photo-Fenton degradation mechanism is proposed. This study holds important promise in addressing the pressing problem of water pollution caused by antibiotics and organic pollutants.
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