JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Xiuna Jia,Sijia Li,Yudan Wang,Ting Wang,Xiaohong Hou
The occurrence of numerous antibiotics, such as sulfonamides (SAs), in environmental water has recently heightened concerns in consideration of their potential threat to human health and aquatic ecosystems. The removal of pharmaceuticals by adsorption comprises some of the most promising techniques because of their easy regeneration, low cost, and high efficiency. In this work, MIL-101(Cr)@GO, with a high surface area, was synthesized. Its adsorption properties toward three SAs were examined in batch adsorption experiments to probe the underlying factors of adsorption behavior and the mechanism for the first time. The pronounced factors that influenced the adsorption and removal process were investigated. The adsorption kinetics and isotherms were studied in order to characterize the operation. The adsorption kinetics demonstrated that the adsorption process would match the pseudo-second-order kinetic model. Furthermore, the adsorption was spontaneous, entropy was decreased, and the process was exothermic, and the equilibrium data was more appropriate described by the Freundlich isotherm model. Moreover, the adsorption–desorption of MIL-101(Cr)@GO could be consecutively cycled at least five times. MIL-101(Cr)@GO exhibited remarkable removal efficiency compared to MIL-100(Fe), MIL-101(Cr), and other adsorbents. These results demonstrated that MIL-101(Cr)@GO would be a promising adsorbent for the removal of sulfonamides from water samples and even for environmental protection.
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Rongrong Zhao,Zuoming Zhou,Xiaodan Zhao,Guohua Jing
A novel amino-functionalized vermiculite (AVT)-supported nanoscale zero-valent iron (AVT-nZVI) was successfully synthesized for Cr(VI) removal from simulated electroplating rinse wastewater. Since the agglomeration and oxidation of nZVI could be weakened and the reaction rate between Cr(VI) and nZVI could be enhanced for the novel AVT-nZVI, an efficient Cr(VI) removal could be achieved. The experimental results showed that 100% of Cr(VI) removal was obtained with AVT-nZVI, whereas only 87.5% was achieved by nZVI after reacting for 60 min with 20.0 mg L −1 Cr(VI) (pH = 5.0). After four cycles, the removal efficiency of Cr(VI) by AVT-nZVI still maintained at above 70%, suggesting that AVT-nZVI exhibited a good performance of reusability. The stability of AVT-nZVI particles was better than nZVI, which was confirmed by the steady-state polarization measurements. Furthermore, the removal of Cr(VI) by AVT-nZVI was proved to be in accordance with the pseudo-second-order adsorption kinetics and Langmuir model. Based on the experiments and characterization, the reaction mechanism of Cr(VI) removal by AVT-nZVI was clarified. The protonated amino groups (-NH 3 + ) on the AVT promoted negative Cr(VI) species to be adsorbed on AVT-nZVI surface. Besides, Cr(VI) was reduced by Fe (0) to Cr(III), which was eventually adsorbed on the surface of AVT-nZVI particles as the Cr(III)-Fe(III) co-precipitates.
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PubMed
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 11
·937
·
IF 3.504
Haiyan Yang,Liang Jiang,Yizhou Li,Guoqing Li,Yepeng Yang,Jiao He,Jiaqiang Wang,Zhiying Yan
In sharp contrast to conventional photosensitization methods in which the organic pigments were often adsorbed, herein we present a study on natural vegetable pigment inserted TiO2aerogel nanocomposites and we directly use red cabbage anthocyanin (RCP) as a structure-directing agent. It was found that pure TiO2aerogel nanocomposite did not exhibit any meaningful activity for photocatalytic reduction of Cr(VI). However, the photocatalytic reduction activity was greatly improved by the RCP inserted TiO2aerogel nanocomposites under visible-light irradiation, which was approximately 2- and 12.3-fold higher than that of TiO2aerogel conventionally photosensitized by RCP and pure TiO2aerogel nanocomposites, respectively. It also exhibited good stability and could be reused at least three times without losing a significant amount of its activity.Keywords:Red cabbage pigment;anthocyanin;TiO2aerogel;photocatalytic activity
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Yuyan Liu,Saran P. Sohi,Siyuan Liu,Junjie Guan,Jingyao Zhou,Jiawei Chen
To address inorganic and organic contaminants in the environment, economic new adsorbents are required. Here we test magnetic biochar for efficient capture of the typical pollutants Cr(VI) and trichloroethylene (TCE) from solution. We used a simple synthesis using 2M FeCl 3 solution and peanut hull biomass to prepare magnetic ZVI biochar at alternate pyrolysis temperatures between 650 and 800 °C. The physicochemical character of the biochars were assessed using X-ray diffraction (XRD) and the Brunauer-Emmett-Teller (BET) method for surface area. The magnetic ZVI biochars were highly effective in the removal of Cr(VI) and TCE. The most effective magnetic biochar produced at 800 °C was further examined using scanning electron microscopy (SEM), revealing a high and even loading of ZVI. After sorption the same magnetic biochar was examined by X-ray photoelectron spectroscopy (XPS) to ascertain the underlying mechanisms. The dependence of Cr(VI) capture on solution pH was also examined. Our interpretation suggests that when pH < pH zpc (2.5) electrostatic attraction and redox reactions dominated the adsorption of Cr(VI). When pH > pH zpc the removal process was controlled mainly by redox reaction and substitution of chromate anions for hydroxyl ( OH) groups. Capture of TCE in contrast involved hydrophobic partitioning, pore-filling and reductive degradation. Overall our results suggest that simple synthesis of magnetic ZVI biochar could offer an economic and effective option to address water contamination issues.
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高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 16
·5384-5396
·
IF 4.052
Xueping Quan,Zhongqiao Sun,Hao Meng,Yide Han,Junbiao Wu,Junli Xu,Yan Xu,Xia Zhang
Developing novel solid adsorbents with high efficiency and excellent selectivity is always an important target in the removal of toxic metal ions from waste water. In this study, a composite nano-adsorbent NH2-mSiO2@MIL-101(Cr) has been fabricated and applied in the efficient removal of Pb(II) and Cr(VI) for the first time. The nanocomposites were characterized by using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), fourier-transform infrared (FT-IR) spectroscopy and thermal gravimetry analysis (TG). The results indicate that a typical core@shell structure has been fabricated by fully coating a mesoporous SiO2 shell over the micro/mesoporous MIL-101(Cr). As a result, the surface charge and the zeta potentials change significantly. Two toxic metal ions, namely, Pb(II) and Cr(VI) were chosen as the main adsorption targets to evaluate the surface adsorption activities. The adsorption conditions were optimized, the influences of other coexisting ions were explored, and the adsorption selectivity was investigated. Interestingly, the NH2-mSiO2@MIL-101(Cr) nanocomposites display a prominent adsorption activity compared with the original MIL-101(Cr) and non-aminated mSiO2@MIL-101(Cr) and excellent selectivity toward Pb(II) in the presence of other divalent metal ions. The adsorption kinetics and adsorption thermodynamics were simulated accordingly, and the enhanced adsorption mechanism was also suggested. The good reusability and adsorption selectivity of the NH2-mSiO2@MIL-101(Cr) suggest their potential applications in the selective removal of special metal ions such as Pb(II) from the waste water.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 9
·3954-3966
·
IF 9.931
Zhikai Yu,Xingmin Gao,Yan Yao,Xiangcheng Zhang,Guo-Qing Bian,Winston Duo Wu,Xiao Dong Chen,Wei Li,Cordelia Selomulya,Zhangxiong Wu,Dongyuan Zhao
Aerosol-assisted methods possess a strong capability for synthesis of titania (TiO2) microspheres. For dynamic separation applications, rough TiO2 microspheres with uniform large micron sizes, high external-surface-area-to-volume ratios, high surface areas, uniform mesopores and abundant hydroxyl groups are desirable. Herein, we demonstrate the combination of evaporation induced self-assembly (EISA) with a microfluidic-jet spray drying process for scalable synthesis of novel mesoporous TiO2 materials with the above-mentioned properties for Cr(VI) removal under both static and dynamic conditions. The TiO2 materials are spherical with uniform large micron sizes (∼45 μm). They possess wrinkled surfaces and thus have high particle external-surface-area-to-volume ratios. They show high surface areas (22–138 m2 g−1), large pore volumes (0.15–0.27 cm3 g−1) and uniform mesopores (5.2–20.7 nm). They carry abundant surface Ti–OH groups due to the presence of oxygen vacancies and the Ti3+ valence state. Several experimental parameters, such as drying and calcination temperatures, are varied, leading to TiO2 samples with tunable surface areas and mesopore sizes. They can be adopted as batch sorbents for removal of Cr(VI) in water with fast adsorption rates, large capacities and pH-dependent adsorption behavior. Part of the adsorbed Cr(VI) can be reduced to Cr(III) in acidic solutions. The influences of adsorbent properties on adsorption performance are elucidated. Moreover, their uniform large micron sizes make them excellent fillers for efficient separation of Cr(VI) in dynamic flows with similar performance to that under static conditions, as well as easy regeneration and high cycling stability. Their adsorption performance under flowing conditions is much better than those of commercial TiO2 nanoparticles and mesoporous TiO2 materials prepared by a conventional EISA method, which make them very attractive for practical dynamic separation applications.
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高影响因子
Catalysts
·
2018
·Vol. 8
·期 6
·251
·
IF 3.465
Shengyan Pu,Yaqi Hou,Hongyu Chen,Daili Deng,Zeng Yang,Shengyang Xue,Rongxin Zhu,Zenghui Diao,Wei Chu
For the purpose of establishing a simple route to prepare a metal-semiconductor hybrid catalyst efficiently and reduce its cost through precise doping noble metals. In this study, ultra-trace silver doped TiO2photocatalysts were fabricated via a “green” ultrasonic impregnation-assisted photoreduction strategy in an ethanol system, and its photocatalytic performance was systematically investigated by utilizing Cr(VI) as the model contaminant. A schottky energy barrier was constructed in Ag@TiO2, which served as a recombination center and possessed superior photocatalytic activity for Cr(VI) reduction. The obtained catalysts exhibited a significante−/h+separation efficiency which directly led to an obvious photocatalytic property enhancement. Then, the resultant Ag@TiO2(0.06 wt %, 30 min irradiation) showed about 2.5 times the activity as that of commercial P25 NPs for Cr(VI) degradation. Moreover, after five cycles, it still maintained considerably high catalytic ability (62%). This work provides a deep insight into preparation techniques of metal-semiconductor photocatalyst and broadens their application prospect.Keywords:Ag@TiO2;Cr(VI) reduction;in-situ photoreduction;ultrasonic impregnation;ultra-trace silver
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jin Li,Jun Li,Dong Yan,Jian Pu,Bo Chi,Li Jian
Cr-poisoning effect on pure double-perovskite PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) cathode and La 2 NiO 4+δ (LN)-coated PBSCF cathode is investigated. During the Cr poisoning test at 750 °C in the presence of SUS430 interconnect, the electrochemical performance of pure PBSCF cathode shows severe degradation, and the significant increase in R P is mainly contributed by the increased R L . The BaCrO 4 deposits are identified on the PBSCF cathode surface. LN-coated PBSCF cathode, by contrast, shows remarkable tolerance towards chromium. The reaction between volatile Cr species and PBSCF cathode can be prevented by a dense LN coating. Thus, a more stable electrochemical performance is achieved by LN-coated cathode during the Cr poisoning test. The results indicate that the introduction of LN coating not only improves the cathode electrochemical performance, but also prevents the cathode from being poisoned by chromium.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Hua Liu,Zumin Wang,Haiyan Li,Hao Wang,Ranbo Yu
Industrial wastewater containing both organic and inorganic pollutants is being generated all the time. Efficient materials are highly needed to purify the polluted water. Thus, a hierarchical structured α-Fe 2 O 3 with excellent adsorptive property has been synthesized by using a facile hydrothermal method. It can be prepared in macroscopic quantity. The as-synthesized α-Fe 2 O 3 with silkworm cocoon-like morphology shows high efficiency in adsorbing Congo red (CR), Methyl orange (MO) and Cr(VI). The removal efficiency of CR, MO and Cr(VI) can reach 99.2%, 83.9% and 100% under appropriate conditions. Besides, this α-Fe 2 O 3 shows high adsorptive ability for mixed CR and Cr(VI) in aqueous solution and the final removal rates can reach 94.7% and 97.9%, respectively. The adsorption kinetics fits well with the pseudo-second-order kinetic model. The results indicate that the product may find potential application in purification of wastewater containing both organic and inorganic pollutants.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 6
·4078-4088
·
IF 2.599
Su Yiping,Cui Mingfang,Zhu Jianhua,Wu Yayu,Wei Yaping,Bian Shicong
A feasible strategy is demonstrated here for low-cost and rapid synthesis of nanosheet-structured BaCO 3 spheres (NSBCs) on a large scale. Experiments reveal that NSBCs were developed from amorphous precursor under the mediation of phosphate. Their nanosheet-composed structures facilitate the rapid removal of contaminant of Cr(VI) within 60 min from aqueous solution, showing an excellent adsorption capacity ( q
m,cal = 227 mg/g, T = 298 K). The kinetic and isotherm processes confirmed well to the pseudo-second-order model and Langmuir adsorption model, respectively. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. NSBCs show better Cr(VI) removal behaviour compared with commercial and some synthetic barium carbonate, which may have potential application in water treatment.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 34
·17833-17841
·
IF 5.968
Cheng-Xiong Yang,Xiu-Ping Yan
The adsorption and extraction of fullerenes on the metal–organic framework MIL-101(Cr) were studied in detail in terms of kinetics, thermodynamics, adsorption isotherms, competitive adsorption, and breakthrough curves. The adsorption of C60 and C70 on MIL-101(Cr) follows a pseudo-second-order kinetic model. The adsorption rate constant for C70 is 3 to 5 times that for C60, showing faster and easier adsorption of C70 over C60 on MIL-101(Cr). Intraparticle diffusion model analysis reveals that the adsorption of C60 and C70 on MIL-101(Cr) proceeds by two phases, surface sorption and intraparticle/pore diffusion. The adsorption of fullerenes on MIL-101(Cr) is controlled by entropy changes. The maximum adsorption capacity for C70 at 30 °C (198.4 mg g−1) is 29 times that for C60 (6.76 mg g−1). MIL-101(Cr) shows much more favorable adsorption of C70 and higher fullerenes than C60 with a high selectivity (αC70/C60 = 24). Selective extraction of C70 and higher fullerenes from crude carbon soot can be easily achieved on MIL-101(Cr) via a simple adsorption–desorption process. The used MIL-101(Cr) can be regenerated by washing with o-dichlorobenzene under ultrasonication. The high selectivity, fast adsorption, easy desorption, and excellent reusability makes MIL-101(Cr) attractive as a novel adsorbent for the enrichment and extraction of C70 and higher fullerenes.
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高影响因子
CATALYSIS TODAY
·
2024
·
IF 5.2
Sen Wang,Hong Chen,Qing Lin,Qian Lu,Wei Lv,Can Wang,Linhao Yu,Yingying Li,Yongdan Li
Two significant strategies for enhancing photocatalyst performance are heterojunction construction and band gap modulation, but up until now, these methods have typically been treated separately. This work examines a strategy combining the heterojunction with a mid-gap state to prepare a novel Cr 2 O 3 modified Cr-doped g-C 3 N 4 photocatalyst for antibiotics degradation. According to the characterization results, the integration of Cr 3d orbital energy level into the original band gap of g-C3N4 results in the formation of Cr-doped g-C 3 N 4 , leading to a reduction in the band gap from 2.80 eV to 2.36 eV. Besides, the constructed Z-type heterojunction enhances the separation of photoinduced carriers. The degradation experiments of tetracycline proved the significant enhancement in the photocatalytic performance of the prepared catalyst. In addition, the degradation effect of the prepared catalyst on tetracycline in micro-polluted lake water was also investigated, revealing the applicability of the catalyst in the purification of natural water environments.
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