JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 16
·11037-11055
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IF 3.442
Zhang Bo,Zhang Tailiang,Zhang Zhidong,Xie Mingyuan
A graphene/magnetite/montmorillonite nanocomposite (GQDs/Fe 3 O 4 /MMT) was synthesized via a simple green hydrothermal method. The effects of pH, temperature, contact time, adsorbent quality, dye concentration and ultrasonication on the adsorption performance of methylene blue (MB) were investigated. For ultrasonic-assisted adsorption, the adsorption rate of GQDs/Fe 3 O 4 /MMT can reach 10 s. Ultrasound strongly affected the adsorption equilibrium time but did not affect the maximum adsorption capacity. The main reason for ultrasonic-assisted dyes ultrafast adsorption is cavitation that graphene quantum dots (GQDs) promote nucleation. By adjusting the amount of surface charge, the adsorbent has excellent selective ultrasonic-assisted ultrafast adsorption properties of mixed dyes. The adsorption performance of the GQDs/Fe 3 O 4 /MMT was weakly affected by temperature. The theoretical and experimental maximum adsorption capacities were 429.4 mg/g and 225.0 mg/g, respectively. The adsorption kinetics and adsorption isotherms agree well with the pseudo-second-order equation and the Langmuir equation, respectively. After six adsorption/desorption cycles, the adsorption and desorption efficiency of the dye decreased slightly. The results indicated that the GQDs/Fe 3 O 4 /MMT nanosorbent has strong potential for removing the cationic dye MB from wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Rui Zhao,Yanzi Li,Bolun Sun,Shen Chao,Xiang Li,Ce Wang,Guangshan Zhu
Dye pollution in water environment is a significant threat to ecological and human health, and its removal is very important yet challenging. Magnesium silicate-based materials have proven to be good adsorbents for dye wastewater treatment. In consideration of recycling and practicability, flexible and robust magnesium silicate fiber membrane (MgSiFM) is prepared for the first time via hydrothermal reaction using electrospun flexible SiO 2 fiber membrane as silicon template. The preparation process is efficient, low cost and easy to scale-up. MgSiFM shows high tensile strength (5.52 MPa) and good mechanical stability. Moreover, the BET surface area of MgSiFM is measured as 463.4 m 2 /g, which is similar to the reported powdery magnesium silicate-based materials. As expected, MgSiFM shows excellent adsorption capacity of 609.75 mg/g for cationic dye methylene blue (MB) with good recyclability. In particular, unlike powdery MgSi adsorbents, MgSiFM could act as a filter membrane for continuous and fast MB removal. The filtration performance is better than commercial nylon-6 microfiltration membrane and MgSi coated electrospun polymer fiber membrane. This work demonstrates a novel and facile strategy for the preparation of flexible magnesium silicate fiber membrane, which exhibits promising potential in practical wastewater treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2015
·
IF 2.858
Guisheng Gong,Faai Zhang,Zehong Cheng,Li Zhou
This study presents a simple method to fabricate magnetic carboxymethyl starch/poly(vinyl alcohol) (mCMS/PVA) composite gel. The obtained mCMS/PVA was characterized by Fourier transform infrared (FTIR) spectra, vibrating-sample magnetometer (VSM) and scanning electron microscopy (SEM) measurements. The application of mCMS/PVA as an adsorbent for removal of cationic methylene blue (MB) dye from water was investigated. Benefiting from the combined merits of carboxymethyl starch and magnetic gel, the mCMS/PVA simultaneously exhibited excellent adsorption property toward MB and convenient magnetic separation capability. The effects of initial dye concentration, contact time, pH and ionic strength on the adsorption performance of mCMS/PVA adsorbent were investigated systematically. The adsorption process of mCMS/PVA for MB fitted pseudo-second-order model and Freundlich isotherm. Moreover, desorption experiments revealed that the mCMS/PVA adsorbent could be well regenerated in ethanol solution without obvious compromise of removal efficiency even after eight cycles of desorption/adsorption. Considering the facile fabrication process and robust adsorption performance, the mCMS/PVA composite gel has great potential as a low cost adsorbent for environmental decontamination.
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POWDER TECHNOLOGY
·
2015
·
IF 2.349
Xinshan Rong,Fengxian Qiu,Chen Zhang,Liang Fu,Yuanyuan Wang,Dongya Yang
Nickel oxide/graphene oxide (NiO/GO) nanocomposite was prepared by a hydrothermal method combining a subsequent calcination process. X-ray diffraction (XRD), Raman spectrometer (Raman), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and X-ray photoelectron spectroscopy (XPS) methods were used for the characterization of nanocomposite. Removal of aromatic heterocyclic dye methylene blue (MB) from aqueous solution using adsorption and photodegradation activity of NiO/GO nanocomposite was investigated. The effects of NiO/GO nanocomposite dose, pH, and contact time on the removal efficiency of MB were also investigated. Compared with that in the dark, NiO/GO nanocomposite shows a faster and higher removal efficiency by the photodegradation and adsorption under visible light irradiation . A remarkable removal efficiency of MB achieved 97.54% by NiO/GO nanocomposite after 2 h. It could be concluded that synergy of photodegradation and adsorption has a significant progress for removal of MB under visible light compared with that of only adsorption without light.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Zhimin Wu,Li Zhang,Qingqing Guan,Ping Ning,Daiqi Ye
In order to prevent the reunion of reduced graphene oxide (rGO) during storage, α-zirconium phosphate (ZrP) was used as the modifier, and a peculiar adsorbent of ZrP–pillared rGO (rGO–ZrP) was prepared. The features of rGO–ZrP were characterized by using Fourier transform infrared (FTIR), scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersion X-ray (EDX) spectrometer, atomic force microscopy (AFM) and X-ray diffraction (XRD) measurements. Then, rGO–ZrP was employed as the adsorbent and the adsorption characteristics of rGO–ZrP toward methylene blue (MB) were evaluated under laboratory conditions. The results showed that rGO–ZrP possessed a higher BET specific surface area relative to rGO. The maximum adsorption quantity of MB onto the new prepared rGO–ZrP was ∼1.38 g/g at 30 °C. With the increase of storage day, the BET specific surface area and the maximum adsorption capacity of rGO–ZrP approximately remained unchanged. Under the maximum adsorption capacity, the adsorption quantity of MB onto rGO–ZrP was dependent on the initial concentration of MB, and higher temperature could facilitate the adsorption process. The efficiency of rGO–ZrP almost remained constant during the first six cycles of adsorption–desorption process. In addition, the fluorescence spectra implied that the adsorption of MB onto rGO–ZrP was a π–π stacking adsorption process, and the pillared structure of rGO–ZrP greatly enhanced the noncovalent adhesion. In conclusion, rGO–ZrP could serve as a promising adsorbent for the removal of MB in waste water.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
·
IF 3.782
Qiong Tian,Xiaojing Yu,Lifeng Zhang,Demei Yu
Raspberry-like multihollow polymer microspheres were prepared by seeded swelling polymerization and decorated with silver nanoparticles (AgNPs) in the presence of polyvinylpyrrolidone (PVP) which acted as both reducing and stabilizing agent. Formation mechanism of the raspberry-like multihollow microsphere was discussed on the basis of water absorption of sulfonated groups in the seeded swelling polymerization. Effects of weight ratio of sodium 4-vinylbenzenesulfonate to styrene (NaSS/St) of the seed particles, the concentration of PVP and [Ag(NH 3 ) 2 ] + ions on the properties of polymer/Ag nanocomposite microspheres were investigated by microscopic observation, nitrogen adsorption/desorption isotherms, UV–vis absorption spectra , X-ray diffraction patterns and thermogravimetric analysis . The results demonstrated that the raspberry-like multihollow microspheres were successfully fabricated by controlling over the NaSS/St of the seed particles in the seeded swelling polymerization by which the fabrication of hollow structure became simple and convenient. The spherical AgNPs were loaded on the polymer microsphere by in-situ chemical reduction due to the stabilization and reduction of PVP and the attraction between sulfonated groups and [Ag(NH 3 ) 2 ] + ions. The raspberry-like multihollow polymer/Ag microspheres showed good catalytic activity and reusability in the degradation of methylene blue in the presence of NaBH 4 .
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 31
·期 11
·e3798
·
IF 2.319
Rui Wang,Chunhua Ge,Tianzhu Xing,Yuanyuan Zhang,Yundi Zhang,Xiangdong Zhang
A magnetic hybrid material (Fe 3 O 4 -COOH/HKUST-1) was easily synthesized via a two-step simple solvothermal method. Through adding sodium acrylate directly into the synthesis of Fe 3 O 4 spheres, the surface has more carboxyl groups. It is notable that the reactions proceed without use of organic surfactants. The magnetic hybrid material was characterized using various techniques. The magnetic hybrid material has a high specific surface area (430.15 m 2 g −1 ) and excellent magnetism (23.65 emu g −1 ). It is an efficient adsorbent for removing organic dyes like methylene blue (MB) from aqueous solution. It also can be easily recovered from liquid media using an external magnetic field. Adsorption experiment shows the magnetic hybrid material possesses a high adsorption capacity (118.6 mg g −1 ), and has high adsorption efficiency (94.3%) after five adsorption cycles with ethanol (0.2% HCl) as eluent. The sorption kinetics and isotherm analysis indicate these sorption processes are better fitted to the pseudo-second-order and Langmuir equations. Thermodynamic study shows the sorption processes are spontaneous and endothermic.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Meiling Yang,Xiaolin Liu,Yunchuan Qi,Wen Sun,Yi Men
A series of environmental-friendly adsorbents, κ-carrageenan/graphene oxide gel beads (κ-Car/GO GBs), were synthesized from κ-carrageenan and graphene oxide via a simple method. The composition and morphology of these gel bead adsorbents were characterized by Fourier transform infrared spectroscopy , Raman spectroscopy , X-ray photoelectron spectroscopy, thermogravimetric analysis , scanning electron microscopy, etc. The adsorption ability of κ-Car/GO GBs was investigated by measuring the removal of methylene blue (MB) from aqueous solutions. The effects of the initial dye concentration, adsorption time, temperature and pH value were evaluated. The results of the adsorption experiments were consistent with the Langmuir model, while the adsorption kinetic data were fit with a pseudo-second-order model. The maximum adsorption capacity of κ-Car/GO GBs for MB is 658.4 mg/g at 25 °C, which barely declined even after five cycles. Hence, the κ-Car/GO GBs are outstanding adsorbents with high adsorption capacity and excellent regeneration ability. Furthermore, the gel bead adsorbents could be easily separated from aqueous solutions after adsorption using a simple filtration method.
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BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Heyi Ge,Cuicui Wang,Shanshan Liu,Zhen Huang
The citric acid functionalized magnetic graphene oxide coated corn straw (CA-mGOCS) as a new adsorbent was synthesized in this work for the elimination of methylene blue (MB) from waste water. The as-prepared CA-mGOCS was tested by SEM, FTIR, XRD, Roman spectrum, TGA, particle size analyzer, BET and magnetic properties analyzer. Some factors affecting adsorption removal efficiency were explored. As a result, the addition of 5 g CS (CA-mGO5CS) had the better adsorption performance than other adsorbents. The pseudo-second-order model and the Freundlich described the adsorption behavior well. The equilibrium adsorption capacity was 315.5 mg g −1 for MB at pH = 12 and 298 k. The electrostatic incorporation as well as hydrophobic interactions between CA-mGO5CS and MB determined the favourable adsorption property. Besides, the thermodynamic studies results ΔG < 0, ΔH < 0, ΔS < 0 suggested that the adsorption was a spontaneous, exothermic and randomness decrease process. Finally, reusability studies imply that CA-mGO5CS has an excellent reproducibility.
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Materials
·
2017
·Vol. 10
·期 1
·84
·
IF 2.654
Chaodao Li,Jianjiang Lu,Shanman Li,Yanbin Tong,Bangce Ye
Based on the adsorption performance of composite microspheres with activated carbon (AC) and sodium alginate (SA), as well as the magnetic property of Fe3O4, we designed and explored an efficient strategy to prepare a unique, multifunctional Fe3O4/AC/SA composite absorbent (MSA-AC) that extracted dye from aqueous solution. The composite exhibited the following advantages: rapid and simple to prepare, environmentally friendly process, low-cost, recyclability, and multi-functionality. The physicochemical properties of the prepared magnetic microspheres were measured, and methylene blue (MB) was selected to investigate the performance of the magnetic absorbent. The results showed a maximum adsorption capacity of 222.3 mg/g for MB. Adsorption studies revealed that the data of adsorption isotherms and kinetics fit the pseudo-second-order kinetic model and Langmuir isotherm model.Keywords:magnetic microsphere;methylene blue;adsorption properties
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Optical Materials Express
·
2017
·Vol. 7
·期 2
·409-414
·
IF 2.591
Junliang Lv,Gongqing Wu,Yang He,Lijuan Zhang,Yunhong Yi
Plasmonic nanoparticles hold great potential in photodynamic therapy (PDT). Herein, a nanoplatform of methylene blue (MB) loaded gold nanobipyramids@SiO2 (GBPs@SiO2-MB) was designed to optimize the generation rate of singlet oxygen (1O2), which was based on the plasmonic effect. The surface plasmon resonance (SPR) of GBPs was finely overlapped with the excitation absorption of MB, a wildly applied organic PDT drug prone to enzymatic degradation. This mesoporous silica coating nanoplatform protects MB molecules against degradation, and this overlap greatly enhances the 1O2 yield of MB by the SPR electron from the GBPs. The GBPs@SiO2-MB nanoparticles exhibit a synergistic effect of PDT and photothermal therapies (PTT) of cancer cells under laser irradiation. This study provides a alternative strategy to improve the classic MB treatment for phototherapy application.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.112
Lei Shi,Liping Hu,Jing Zheng,Min Zhang,Jingli Xu
A specific metal organic framework (MOF) material was synthesized based on Ni(Ac)2 · 4H2O and 1-H-benzimidazole-5-carboxylic acid through hydrothermal method. It was a promising candidate as adsorbent due to its large surface areas, porous structure, ordering and controllable properties. In this paper, it was characterized by XRD, SEM, FTIR, TGA and N2 adsorption isotherm. Meanwhile MOF was treated as adsorbent for absorption of methylene blue. Using this material to remove methylene blue, which is low cost, simple and high efficiency. It shows great potential in removing other dyes and the adsorption rate could reach 85.08%.
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