CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Bin Ou,Jixiao Wang,Ying Wu,Song Zhao,Zhi Wang
Magnetic and recyclable calcined CoFe-LDH/g-C 3 N 4 catalyst was prepared by co-precipitation and calcination method, and used as a multifunctional material to remove hexavalent chromium (VI) via the synergistic effect of adsorption and photocatalysis. The calcined CoFe-LDH provide surface adsorption in the composite, which could lead to the adsorption of Cr (VI) with high adsorption capacity and fast speed. The g-C 3 N 4 nanosheets have high photocatalytic activity in situ for the composite to reduce Cr (VI) into Cr (III). The results demonstrated that 60% Cr (VI) (50 mg L −1 ) can be adsorbed by the nanocomposite in 10 min and the removal efficiency of Cr (VI) reached 100% in 90 min under visible light irradiation by adsorption and photocatalysis. In addition, the calcined CoFe-LDH/g-C 3 N 4 exhibits a mostly pore size about 2.58 nm, large specific surface area (101.61 m 2 g −1 ) with the high structural stability and saturation magnetization (23.06 emu g −1 ), hence, could be easily recycled for ten subsequent runs with little activity loss.
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CHEMOSPHERE
·
2018
·
IF 4.427
Zhipan Wen,Yalei Zhang,Gang Cheng,Yingru Wang,Rong Chen
In this study, nanosized ordered magnetic mesoporous Fe-Ce bimetal oxides (Nanosized-MMIC) with highly well-ordered inner-connected mesostructure were successfully synthesized through the KIT-6 template method. This Nanosized-MMIC displayed excellent adsorption capacities for As(V), Cr(VI) and AO7, and the corresponding calculated maximum adsorption capacities of material were 111.17, 125.28 and 156.52 mg/g, respectively. As(V) and Cr(VI) removal by Nanosized-MMIC were slightly dependent on the ionic strength but highly solution pH-dependent, the coexistent silicate and phosphate ions competed remarkably with both As(V) and Cr(VI) for the adsorption active site. Mechanisms indicated As(V) and Cr(VI) formed inner-sphere complexes on Nanosized-MMIC interface via the electrostatic interaction and surface complexation, while the total organic carbon (TOC) change demonstrated that AO7 could be removed completely and no organic intermediates formed through the adsorption process. In addition, Nanosized-MMIC also possessed superior adsorption performance in As(V)/Cr(VI)-AO7 binary systems, and the reusable and regeneration properties indicated that the obtained nanomaterials could maintain at a comparatively high level after several recycling. Finally, fixed-bed experiments suggested the Nanosized-MMIC was expected to have a promising excellent nano-adsorbent with high application potential for co-existed toxic heavy metals and organic dyes removal in practical wastewater treatment .
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Shaohua Liu,Jiale Cui,Jingbin Huang,Boshi Tian,Fan Jia,Zhenling Wang
Nitrogen-doped carbon dots (N-CDs) with well-distribution size and strong blue emission were successfully synthesized via a simple mild hydrothermal strategy using citric acid and ethylenediamine as co-precursors. The highly fluorescent N-CDs exhibit high fluorescence quantum yield (QY, 58.6%), excitation-independent emission behavior, and good photostability. The experimental results showed that the N-CDs can be served as a fluorescent sensing platform for detection of Cr(VI) ions due to the effective fluorescence quenching effect of Cr(VI) ions. The quenching mechanism probably arises from the inner filter effect (IFE) and the electron transfer due to the strong interactions between functional groups ( COOH, OH and NH 2 groups) of the N-CDs and Cr(VI) ions. It is also found that the N-CDs showed high sensitivity toward Cr(VI) ions with a detection limit of 0.26 μM. Moreover, the obtained N-CD can be employed as chemsensor to detect Cr (VI) in real river water samples, which have potential applications in the environmental water.
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高影响因子
ACS Omega
·
2018
·
IF 0
Jisuan Tan,Yiheng Song,Xiaohua Huang,Li Zhou
The development of low-cost adsorbent with excellent adsorption property remains a big challenge. Herein, the functionalization of natural peach gum polysaccharide (PGP) with multiple amine groups for the removal of toxic Cr(VI) ions from water was studied. The obtained PGP-NH2 gel exhibited high-removal efficiency (>99.5%) toward Cr(VI) ions, especially with relatively low initial concentration of Cr(VI) ions (≤250 mg/L). The influences of pH, ionic strength, contact time, initial concentration, and temperature on the adsorption of Cr(VI) ions were systematically investigated. The PGP-NH2 gel showed rapid adsorption rate and could reach adsorption equilibrium within about 40 min. The Cr(VI) ion uptake process could be described by pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption capacity of PGP-NH2 gel could reach 188.32 mg/g. Thermodynamic investigation results indicated the spontaneous and exothermic characteristic of the uptake process. Moreover, the PGP-NH2 gel also exhibited favorable reusability, and 135.52 mg/g of adsorption capacity was retained even after being reused for five times. Considering its low cost and superior uptake property, the PGP-NH2 gel holds a great promise for employing as an adsorbent to treat Cr(VI) ion-containing wastewater.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Fenfen Jing,Ruowen Liang,Jinhua Xiong,Rui Chen,Shiying Zhang,Yanhua Li,Ling Wu
A highly effective Iron Metal-Framework photocatalyst (MIL-68(Fe)) has been successfully prepared via a facile solvothermal method under acidic condition. The UV–vis diffuse reflectance spectrum reveals that the absorption edge of MIL-68(Fe) is 440 nm. The flat-band potential of MIL-68(Fe) is −0.6 V vs. NHE at pH = 6.8, which is more negative than the redox potential of Cr(VI)/Cr(III) (+0.51 V, pH = 6.8). Consequently, it is thermodynamically permissible for the transformation of photogenerated electrons to the Cr(VI) to produce Cr(III). Moreover, MIL-68(Fe) could perform as an efficient photocatalyst towards the reduction of Cr(VI) aqueous with a wide pH range. After 5 min of visible light illumination (λ > 420 nm), almost 100% Cr(VI) can convert to Cr(III) with (NH 4 ) 2 C 2 O 4 as a scavenger (pH = 3), which is also higher than that of N-doped TiO 2 (50%) and ZnO (7.6%) under identical conditions. Furthermore, MIL-68(Fe) is proved to perform as a highly efficient photocatalyst for remove of different aqueous contaminant with malachite green (MG) as a scavenger. Finally, a possible reaction mechanism has also been investigated in detail.
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RSC Advances
·
2016
·Vol. 6
·期 105
·103585-103593
·
IF 3.289
Junfeng Zhao,Jiachen Zha,Hongbin Lu,Cheng Yang,Kou Yan,Xiangkang Meng
Cauliflower-like nickel alkoxide, Ni/NiO and NiO architectures were synthesized via a reflux route using NaBH4–EG as alkaline precipitant. The as-prepared powders were characterized by XRD, FESEM, TEM, HRTEM, and N2 adsorption/desorption isotherms. The results show that the nickel alkoxide is made up of smooth spherical building blocks with diameters of about 500 nm that aggregate interactively to form whole 3D structures. The Ni/NiO and NiO architectures can be obtained by the direct thermal transformation from nickel alkoxide precursor at 300 °C and 600 °C, respectively, which are assembled by nanoparticles and composed of mesopores and macropore. The as-prepared three samples exhibit excellent performance for the removal of Congo red (CR) and Cr(VI) pollutant from aqueous solutions due to their hierarchical structures and high specific surface areas. The corresponding adsorption process fits well with the pseudo-second-order kinetics model and the Langmuir model. Compared with nickel alkoxide and NiO, Ni/NiO architectures show the highest adsorption performance, with the maximum capacity of 642.37 and 92.52 mg g−1 for CR and Cr(VI), respectively. Further, the easily magnetic separation and reused clearly suggests that the Ni/NiO architectures can be explored as an excellent adsorbent for the removal of organic dye and heavy metal ions from aqueous solutions.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Peng Li,Yifei Li,Mengyao Qi,Xia Zhang
In recent years, most of the researches on nanozymes have focused on improving their catalytic activity and direct synthesis, but this task is still very complicated. Bimetallic oxides are particularly popular because of their mixed valence and special structure. In this study, iron-manganese bimetallic oxide nano-cubes (IMBO NCs) were prepared by a rapid and effective solvothermal synthesis technique, and showed excellent oxidase-like activity. The exposure of Cr(III) and Cr(VI) inhibited and enhanced the catalytic activity of IMBO NCs respectively. On this basis, a simple, economical and accurate colorimetric sensor was established by combining with 3,3′,5,5′-tetramethylbenzidine (TMB). Using oxidase activity instead of traditional peroxidase activity to detect Cr(III) and Cr(VI) greatly shortens the detection time. The method has also been successfully applied to the quantitative monitoring of Cr(III) and Cr(VI) in lake water. This study provides theoretical support for the effective design of bimetallic oxide nanozyme activity and can guide the development of accurate detection systems for the analysis of Cr(III) in food and Cr(VI) in environment.
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Processes
·
2024
·Vol. 12
·期 11
·2598
·
IF 2.8
Xiaofei Li,Tianfu Li,Xiaohu Jin,Yanfu Wei,Yanping Bao,Qian Yao,Fuhua Li,Weicheng Xu,Xiaolian Wu
The adsorption of toxic metals onto iron oxides is a prevalent geochemical process in natural environments. Organic acids are known to modify the adsorption features of toxic ions through either competitive or cooperative effects. Nowadays, the toxic metal adsorption influenced by organic acids on iron oxides with varying facet exposures is not fully understood. This study explored how L-Aspartic acid (LA) influences Cr(VI) adsorption on two different exposure facets of lepidocrocite through batch adsorption experiments, in situ ATR-FTIR spectroscopy, and 2D-COS analysis. The results reveal that LA competes for available binding sites on lepidocrocite, consequently inhibiting the adsorption of Cr(VI). Rod-shaped lepidocrocite (R-LEP) owns more (001) facets and shows stronger Cr(VI) adsorption and LA competition than plate-like lepidocrocite (P-LEP), which mainly has (010) facets. The data for Cr(VI) uptake on both P-LEP and R-LEP within the effect of LA are well-fitted by the pseudo-second-order kinetics and the Freundlich isotherm model, suggesting chemical interaction as the dominant process for Cr(VI) coordination on lepidocrocite. Cr(VI) ions favor interaction with R-LEP over P-LEP, forming inner-sphere complexes on (001) facets. Concurrently, LA’s carboxyl groups can compete for the active sites on the lepidocrocite surfaces, engaging in anion exchange with hydroxyl groups, and forming outer-sphere and inner-sphere structures. This competitive effect is particularly pronounced in the R-LEP system. The current findings are expected to broaden insights into how the exposed facets of lepidocrocite influence the fate of Cr(VI) in the organic acid coexistence environment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yihong Chen,Zihan Wang,Meiqi Liang,Yang Liu,Wenjuan Dong,Qin Hu,Chuan Dong,Xiaojuan Gong
Using lignin as a raw material to prepare fluorescent nanomaterials represents a significant pathway toward the high-value utilization of waste biomass. In this study, Ni-doped lignin carbon dots (Ni-LCDs) were rapidly synthesized with a yield of 63.22 % and a quantum yield of 8.25 % using a green and simple hydrothermal method . Exploiting the inner filter effect (IFE), Cr(VI) effectively quenched the fluorescence of the Ni-LCDs, while the potent reducing agent ascorbic acid (AA) restored the quenched fluorescence, thus establishing a highly sensitive fluorescence switch sensor platform for the sequential detection of Cr(VI) and AA. Importantly, the integration of a smartphone facilitated the portability of Cr(VI) and AA detection, enabling on-site, in-situ, and real-time monitoring. Ultimately, the developed fluorescence and smartphone-assisted sensing platform was successfully applied to detect Cr(VI) in actual water samples and AA in various fruits. This study not only presents an efficient method for the conversion and utilization of waste lignin but also broadens the application scope of the CDs in the field of smart sensors.
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Desalination and Water Treatment
·
2024
·
IF 1
Xiaoxia Chen,Yu Ma,Zhengjie Su,Xinxin Zhang,Jinguo Lin,Xiaoyun Chen
Herrin, the lignin extracted from Rice hull , Phyllostachys edulis , Cunninghamia lanceolata, and Populus tomentosa Carrière were used as a soft support to grow Ti-doped Bi 2 (O,S) 3 bimetal oxysulfide catalysts, labeled BT-Rh, BT-Pe, BT-Cl, and BT-Ptc, respectively. The catalytic reduction activity was investigated through the decolorization of methyl orange (MO), methylene blue (MB), and reduction of Cr(VI) solutions under dark. The lignin-supported BiTiOS improved crystallinity, decreased aggregate size, increased specific surface area, and enhanced electrochemical active sites, leading to improve electron transfer and accelerated reduction rates. The catalytic reduction activity of organic dyes and Cr(VI) was significantly improved with lignin-supported BiTiOS. The 5 mg BT-Pe catalyst completely reduced 100 mL of 50 ppm MO, MB, and Cr(VI) solutions in 6, 6, and 18 min, respectively, with the reaction kinetic rate of 0.6782, 1.090, and 0.1189 min −1 , and demonstrated good durability, maintaining a reduction rate of 95 % after six cycles. This work provides a feasible approach combining biomass/inorganic materials to treat industrial wastewater.
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LANGMUIR
·
2025
·
IF 3.9
Ruixin Lai,Xin Su,Xiaping Zhu,Ping Zhao,Wei Ren
A composite hydrogel microsphere (LDH/SA/PEI) with a three-dimensional honeycomb-like porous structure was fabricated using Mg–Al layered double hydroxide (LDH) as the matrix material, sodium alginate (SA) and polyethylenimine (PEI) as gel precursors, and a CaCl2/FeCl3 mixed solution as the hybrid cross-linking agent. The LDH/SA/PEI has realized the synergistic adsorption–reduction removal of Cr(VI) from wastewater. The optimal preparation process consists of 1.5 wt % SA, 4 vol % PEI, 4.5 wt % CaCl2, and 0.1 mol/L FeCl3. The maximum Cr(VI) adsorption capacities of 79.6–118 mg/g between 25 and 55 °C are accessed at 12 g/L LDH and pH 2 within 300 min. Kinetic and thermodynamic analyses reveal that the removal of Cr(VI) by the LDH/SA/PEI involves three distinct stages, surface diffusion, intramesopore diffusion, and intramicropore diffusion, which exhibits strong agreement with the intraparticle diffusion model (R2 > 0.95). The ΔG values of the reactions are all less than 0, with a ΔH of 35.3 kJ/mol and a ΔS of 126.8 J mol–1 K–1, indicating a chemisorption-dominated spontaneous endothermic process. Scale-up experiments confirm that 3 g/L LDH/SA/PEI can reduce the Cr(VI) concentration from 20 to <0.5 mg/L within 180 min. This study provides a novel material fabrication strategy with high adsorption capacity, mechanical stability, and sustainability for Cr(VI)-containing wastewater treatment, which has significant implications for anion-polluted industrial wastewater and the functional development of LDH-based composites.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Naichuan Yu,Xianhong Zeng,Xingning Ma,Yu Sun,Yixuan Wang,Bingbing Chen,Zhaoqi Luo,Chaofang Dong,Kun Shen,Junsheng Wu
Treating real electroplating wastewater is challenging due to the coexistence of organic contaminants and heavy metal ions, which collectively increase toxicity and pose serious risks to human and environmental health. In this study, the simultaneous removal of a typical organic pollutant (benzodiacetone) and a heavy metal ion (Cr(VI)) from electroplating effluent was investigated using a heterogeneous electro-Fenton process catalyzed by a novel Ce-Fe 2 O 3 /Al 2 O 3 material. Comprehensive characterization and theoretical calculations confirmed the excellent catalytic performance of the synthesized catalyst. Under near-neutral conditions, the electro-Fenton system achieved removal efficiencies of 99.1 % for benzodiacetone and 98.8 % for Cr(VI). The mechanism of simultaneous degradation was explored, revealing that Ce doping enhanced Fe redox cycling by lowering the binding energy between H 2 O 2 and Fe and facilitating electron transfer from Fe (III) to Fe (II). Additionally, Ce doping improved the stability and reusability of the catalyst. And the Ce could also extend the lifetime and reusability of the catalyst. This work developed a highly efficient heterogeneous catalyst in the electro-Fenton process and demonstrated that the Ce-Fe 2 O 3 /Al 2 O 3 catalyst had a superior application potential in synergic removal of Cr(VI) and benzodiacetone area.
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