CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jingtao Bi,Xin Huang,Jingkang Wang,Ting Wang,Hao Wu,Jinyue Yang,Haijiao Lu,Hongxun Hao
In this work, to simultaneously remove organic dyes and Pb(II) from wastewater, a series of magnetic Fe 3 O 4 @C@TiO 2 -nanotube composites were designed and successfully synthesized via a new facile oil-phase cyclic magnetic adsorption (OCMA) method. The structural properties of the synthesized composites were investigated by different characterization methods systematically. It was found that Fe 3 O 4 was uniformly deposited on the inner walls of TiO 2 nanotubes. Although a Type III band alignment was formed in the catalysts, Fe 3 O 4 @C@TiO 2 -nanotube composites exhibited enhanced light absorbing ability and enlarged absorption edge due to efficient separation of h + and e − , which was verified by UV–Vis (Ultraviolet–visible) and PL (Photoluminescence) spectra. Decontamination experiments of 1FeCTi showed that more than 98% of RhB and about 92% of Pb(II) ions could be removed through adsorptive removal in the dark equilibrium period and further elimination during the illuminating period. The pseudo-first-order model, L-H model and adsorption-reaction model were established to describe the adsorption of Pb(II) in the dark, photodegradation of RhB and further elimination of Pb(II), respectively. A four-step mechanism was proposed to describe the decontamination process of Pb(II) during the illuminating period according to the final forms of Pb (Pb δ1 , Pb δ2 , Pb 0 and PbO). Finally, it was found that the photocatalytic activity would be maintained in the recycle experiments due to the existence of 1FeCTi@PbO heterostructure.
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NANO
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2018
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IF 1.1
Yanmei Feng,Zhiqiang Wang,Yunfeng Yang,Xiangfeng Wu,Xiaodong Gong,Yajian Liu,Yufei Li,Zuolin Cao,Chao Wang,Xin Tong
The Ag 2 SO 3 /NaNbO 3 hybrids have been fabricated via a facile method at room temperature. Several methods such as X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, scanning electron microscopy, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy were used to characterize the samples. Moreover, the photocatalytic activity of the samples was assessed by degradation of rhodamine B and methyl orange under the visible light illumination. Experimental results indicated the photocatalytic degradation efficiency of the as-fabricated hybrids was first increased and then decreased with increasing the dosage of NaNbO 3 . When the molar ratio of Ag 2 SO 3 to NaNbO 3 was 1:0.7, the as-fabricated composites had the best photodegradation efficiency of 96.4% in 30 min for rhodamine B and 97.1% in 60 min for methyl orange, respectively. These were obviously higher than that of pure samples. Furthermore, Ag 2 SO 3 was conjugated with NaNbO 3 via chemical-bonds rather than physical contact. In addition, the possible photocatalytic degradation mechanism was also provided and the main roles during the process of photocatalytic degradation were played by holes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Wenning Shen,Xu Wang,Yanfeng Ge,Hui Feng,Lajun Feng
The AgO/g-C 3 N 4 hybrids were prepared by growing and anchoring AgO nanoparticles on the surface of g-C 3 N 4 . The results demonstrated that AgO nanoparticles were well-dispersed on the surface of g-C 3 N 4 and AgO/g-C 3 N 4 hybrids were formed. Compared with bulk g-C 3 N 4 , the hybrids with narrow bandgap could adsorb visible light effectively. Additionally, the hybrids exhibited improved photocatalytic activity for RhB degradation under visible light irradiation and strong bactericidal activity against S. aureus . The RhB degradation and S. aureus inactivation were increased with increasing AgO content, in which the hybrid with 35.0 wt% of AgO showed maximum RhB degradation and minimum numbers of survival S. aureus colonies existed, and owned an apparent rate constant about 24.474 and 0.775 times higher than those of blank g-C 3 N 4 and AgO, respectively. The improved activity of the hybrids might be attributed to highly dispersed AgO nanoparticles, increased visible light absorption and high separation efficiency of photogenerated electron-holes originating from the well-matched band structure between AgO and g-C 3 N 4 .
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Journal of the Taiwan Institute of Chemical Engineers
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2014
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IF 2.637
Zhengjun Cheng,Lei Zhang,Xiao Guo,Xiaohui Jiang,Rong Liu
Removals of Lissamine rhodamine B (LRB) and acid orange 10 (AO10) using activated carbon/surfactant from aqueous solution were optimized. Box–Behnken design (BBD) has been employed to investigate the effects of different process variables (such as time of adsorption process, temperature, pH, and initial concentration of the dye) and analyze their interactive effects in the adsorption capacity for the two dye systems. The experimental data could be simulated accurately using second order polynomial regression models because they have high correlation coefficient values ( R 2 ) of 0.9920 and 0.9938, low p -value of 0.000, and their F values of 105.96 and 137.01 for the LRB and AO10 systems, respectively. The optimum conditions were found to be t = 120 min, T = 20 °C, pH = 11.0, and C LRB = 50 mg/L for the LRB adsorption, and t = 120 min, T = 20 °C, pH = 2.5, and C AO10 = 90 mg/L for the AO10 removal. The measured maximum experimental adsorption capacities for the LRB and AO10 systems under above optimum conditions were 218.08 mg/g and 405.15 mg/g, which agreed with their corresponding predicted values (229.43 and 400.51 mg/g) well due to small relative errors of 4.95% and −1.16%, respectively. The adsorption equilibrium and kinetics of the two dye adsorptions onto AC/DDAC were also investigated. The results indicated that Langmuir model presented the best fit and the pseudo-second-order model showed excellent fit to the kinetic data.
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APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Xiaolin Zhu,Kexin Zhang,Nan Lu,Xing Yuan
In the present study, a poly(Rhodamine B)/graphene oxide/multiwalled carbon nanotubes nanocomposite modified glass carbon electrode (PRhB/GO/MWCNTs/GCE) was developed for the simultaneous determination of 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP). The PRhB/GO/MWCNTs film was extensively characterized by emission scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of 2,4,6-TCP and PCP were investigated by cyclic voltammetry, linear sweep voltammetry and differential pulse voltammetry. Due to the synergistic effect, the PRhB/GO/MWCNTs/GCE significantly facilitated the simultaneous electro-oxidation of 2,4,6-TCP and PCP with peak potential difference of 160 mV and enhanced oxidation currents. Under optimum conditions, the oxidation current of 2,4,6-TCP was linear to its concentration in the ranges of 4.0 × 10 −9 to 1.0 × 10 −7 M and 1.0 × 10 −7 to 1.0 × 10 −4 M with the detection limit (S/N = 3) of 8.0 × 10 −10 M. And the linear concentration ranges for PCP were 2.0 × 10 −9 to 1.0 × 10 −7 M and 1.0 × 10 −7 to 9.0 × 10 −5 M with the detection limit of 5.0 × 10 −10 M. Moreover, the proposed PRhB/GO/MWCNTs/GCE was successfully applied to the simultaneous determination of 2,4,6-TCP and PCP in practical water samples.
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Journal of Analytical Methods in Chemistry
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2016
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IF 1.369
Lin Liu,Lu Chen,Jiangong Liang,Lingzhi Liu,Heyou Han
A ratiometric probe for determining ferric ions (Fe3+) was developed based on nitrogen-doped carbon dots (CDs) and rhodamine B isothiocyanate (RhB), which was then applied to selective detection of Fe3+ in PB buffer solution, lake water, and tap water. In the sensing system, FePO4 particles deposit on the surface of CDs, resulting in larger particles and surface passivation. The fluorescence (FL) intensity and the light scattering (LS) intensity of CDs can be gradually enhanced with the addition of Fe3+, while the FL intensity of RhB remains constant. The ratiometric light intensity of CDs LS and RhB FL was quantitatively in response to Fe3+ concentrations in a dynamic range of 0.01–1.2 μM, with a detection limit as low as 6 nM. Other metal ions, such as Fe2+, Al3+, K+, Ca2+, and Co2+, had no significant interference on the determination of Fe3+. Compared with traditional probes based on single-signal probe for Fe3+ detection, this dual-signal-based ratiometric probe exhibits a more reliable and stable response on target concentration and is characterized by easy operation in a simple fluorescence spectrophotometer.
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PubMed
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Kuo Yang,Yun Yang,Yifan Jiang,Bingjie Ye,Luowei Li,Wenju Liu,Tong Yan,Wei Li,Shixi Liu
s In this study, a flower-shaped Bi 2 S 3 /g-C 3 N 4 heterostructure was synthesized via a hydrothermal method and utilized as a visible-light-driven photocatalyst for the removal of hexavalent chromium (Cr 6+ ) and Rhodamine B (RhB). Employing an interface electronic engineering strategy with heterostructure nanosheets, the thickness of the nanosheets was adjusted by varying the molecular weight of the structure guiding agent, polyethylene glycol (Mn = 400, 2000 or 4000). Under visible light irradiation for 18 and 60 minutes, the removal efficiencies of Cr 6+ and RhB reached 95.0 % and 99.9 %, respectively, with corresponding rate constants being 8.64-fold and 9.67-fold higher than pure Bi 2 S 3 . The enhanced photocatalytic efficiency may be attributed to the intermediate adsorption states and increased active sites enhancing light absorption and charge separation. Furthermore, species capture studies revealed that electrons (e - ) and superoxide radicals (·O 2 - ) played crucial roles in the reduction of chromium (VI), while holes (h + ) were the primary active species involved in RhB degradation. Density-functional theory (DFT) calculation demonstrated charge redistribution and electron accumulation can be more obviously observed at Bi 2 S 3 /g-C 3 N 4 than Bi 2 S 3 , which proved that g-C 3 N 4 doping effectively improved the electrons transfer efficiency over the Bi 2 S 3 /g-C 3 N 4 surface, thereby enhancing the photocatalytic activity.
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Nanomaterials
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2024
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IF 4.4
Fangqin Liu,Mingjie Fan,Xia Liu,Jinyang Chen
A cellulose-based carbon aerogel (CTN) loaded with titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) was prepared using sol–gel, freeze-drying, and high-temperature carbonization methods. The formation of the sol–gel was carried out through a one-pot method using refining papermaking pulp, tetrabutyl titanate, and urea as raw materials and hectorite as a cross-linking and reinforcing agent. Due to the cross-linking ability of hectorite, the carbonized aerogel maintained a porous structure and had a large specific surface area with low density (0.0209 g/cm 3 ). The analysis of XRD, XPS, and Raman spectra revealed that the titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) were uniformly distributed in the CTN, while TEM and SEM observations demonstrated the uniformly distributed three-dimensional porous structure of CTN. The photocatalytic activity of the CTN was determined according to its ability to degrade rhodamine B. The removal rate reached 89% under visible light after 120 min. In addition, the CTN was still stable after five reuse cycles. The proposed catalyst exhibits excellent photocatalytic performance under visible light conditions.
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高影响因子
ACS Omega
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2024
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IF 3.7
Xinde Jiang,Zhuoru Tan,Guixian Jiang,Chang Liu,Guiqing Gao,Zhanmeng Liu
A magnetic MnFe2O4-modified graphite-like porous biochar composite (MnFe2O4/KFS800) was synthesized by the hydrothermal method, and its catalytic activity was evaluated in the activation of peroxydisulfate toward degradation of Rhodamine B. After characterization by SEM, XRD, and the BET method, the specific surface area and total pore volume of the MnFe2O4/KFS800 catalyst reached 121 m2/g and 0.263 m3/g, and exhibited plate-like morphology with good crystallinity. The degradation rate of Rhodamine B by the obtained composite was more than 91.1% when the initial concentration of RhB was 10 mg/L, the dosage of MnFe2O4/KFS800 was 0.2 g/L, and the initial pH was 6.7. Then the anti-interference ability of the obtained composite was studied, and it was found that there was a little effect on the degradation of Rhodamine B with the presence of humic acid. Finally, quenching test, EPR research, and XPS analysis were conducted to reveal the catalytic mechanism, and possible mechanism was a synergistic behavior of free radicals (SO4•–, •OH, O2•–) and nonfree radicals (1O2), and trace amounts of uncarbonized bagasse was also involved in the formation of free radicals.
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高影响因子
Materials Research Express
·
2018
·Vol. 5
·期 3
·035510
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IF 1.151
Wenxia Wang,Qi He,Kaijun Xiao,Liang Zhu
In the study, a two-major step involving a hydrothermal method and an electrostatic self-assembly method was adopted to synthesis Fe3O4/GO nanocomposites. The Fe3O4 nanoparticles were successfully modified with the 3-aminopropyltrimethoxy-silane and homogeneously deposited onto the surface of GO. They were used as Fenton-like catalyst to degrade Rhodamine B and displayed a higher activity compared with the pristine Fe3O4 nanoparticles, H2O2, Fe3O4/GO nanocomposite and Fe3O4/H2O2 system, demonstrating the synergistic effect between the superior adsorption properties of GO and the excellent catalytic activity of Fe3O4/H2O2 system. Besides, the possible catalytic mechanism and degradation pathway for RhB molecules by Fe3O4/GO nanocomposites and H2O2 was proposed based on the liquid chromatography-mass spectrometry (LC-MS) analysis. The result reveals that the •OH radicals should be the main actives species during catalytic degradation of RhB by the Fe3O4/GO/H2O2 system. In addition, the catalyst is reusable and shows efficiency up to 5 cycles. We believe the strategy in our work can provide insight into designing the novel catalysts for large-scale degradation of organic pollutants in the wastewater.
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Inorganic Chemistry Frontiers
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2018
·Vol. 5
·期 4
·827-834
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IF 5.106
Yueyun Fang,Qizhang Huang,Pengyi Liu,Jifu Shi,Gang Xu
Molybdenum disulfide (MoS2) nanoflowers synthesized by a hydrothermal route were successfully grafted on a melamine-formaldehyde sponge through a facile dip-coating method to form MoS2 nanoflowers sponges. The MoS2 sponges exhibited high-efficient adsorption performance to cationic dye, Rhodamine B (RhB), with a maximum adsorption capacity of 104.78 mg RhB g−1 product (equal to 213.84 mg RhB g−1 MoS2 by conversion) within 60 min, which was primarily attributed to the strong electrostatic interactions between electronegative MoS2 nanoflowers and positively charged RhB molecules. The equilibrium adsorption and kinetics data fitted well with the Sips isotherm model and the pseudo-second-order kinetic model, respectively. The recyclability experiments showed that the MoS2 sponge adsorbent could be reused for 10 times with above 86.7% of the adsorption capacity retained. More remarkably, the as-prepared sponge adsorbent can be separated from the dye solution easily through a simple salvage instead of any tedious centrifugation or filtration processes. Thus, the separable MoS2 sponge adsorbent with remarkable adsorption capacity and excellent reusability for organic dyes shows promise for large scale water remediation in the future.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Chen-Xuan Li,Rui Wang,Wen Sun,Kangping Cui,Xian-Zhong Fu,Minshu Cui,Yihan Chen,Zhi Guo,Yingying Liu
Advanced oxidation systems (AOS) hold promise for tackling refractory dyes in wastewater, yet the quest for efficient systems tailored to the degradation of dye remains a formidable hurdle. Here, a novel visible-light-driven AOS, consisting of biomimetic Fe(III) salen complex (FeL, salen= N, N-bis(salicylidene)ethylenediamine) and peroxymonosulfate (PMS), was proposed for highly efficient degradation of Rhodamine B (RhB), a model dye. The proposed AOS was capable of degrading 94.8 % RhB in 40 min, outperforming the typical Fe 3+ -based system, which achieved only 52.6 % pollutant degradation under identical conditions. As indicated by experimental results and theoretical calculations, the unique Fe-N 2 O 2 coordination structure of FeL facilitated the adsorption of terminal O (O3) at PMS site, thereby enhancing the heterolysis of the O-O bond and generating high-valent iron-oxo species (i.e., Fe Ⅴ =O) rather than radicals (SO 4 •− , HO • ). The system demonstrated robust resistance to interference from environmental anions (Cl − , NO 3 − , HCO 3 − , SO 4 2− ), pH variations (initial pH 3.0–11.0) and humic acid . More attractively, it achieved 87.3 % chroma and 37.6 % chemical oxygen demand (COD) removal in real dye wastewater samples. This work may shed light on the understanding and development of biomimetic Fe complexes-based AOS for wastewater treatment .
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