CELLULOSE
·
2022
·Vol. 30
·期 2
·1171-1191
·
IF 6.123
Tu Chao,Sun Zenghui,Huang Fei,Wu Ziwei,Chen Hang
The photocatalytic process is an energy-saving and high-efficiency wastewater treatment technology. In this work, a simple in-situ hydrothermal method was used to prepare a photocatalytic material based on waste loofah with high efficiency, reusability and excellent heterostructure to improve the photodegradation efficiency. The prepared MoS 2 @MIL-101(Fe)@Carboxylated loofah composite material was characterized by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), UV–Vis diffuse reflection spectroscopy (UV–vis DRS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transient photocurrent (TPC). The composite material demonstrated high adsorption capacity for hydrochloride (TC) and methylene blue (MB) and photocatalytic capacity under visible-light irradiation at room temperature which were attributed to the porous structure, strong visible-light absorption, and low recombination velocity of electron–hole pairs due to the heterojunctions. The loofah sponge used as a substrate can provide a means for powder catalyst recovery and waste cellulose recycling. Meanwhile, the photocatalyst proved excellent stability in the MB degradation experiment and could be reused for four cycles.
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DESALINATION
·
2023
·
IF 9.9
Lanlan Ye,Li Wang,Zhongao Wei,Shenghua Zhou,Zhikan Yao,Fuqiang Fan,Ying Mei
Tailoring nanofiltration (NF) membrane with low scaling potential and high energy efficiency is of critical importance to its practical implementation for groundwater remediation . In this study, interfacial polymerization was performed on the surface of an intermediate layer of TA-Fe/CNTs coated polyether sulfone (PES) substrate to obtain a loose NF membrane (TFNi-x) with negative surface charges and optimized water transport path for selective permeation of scaling ions and higher water permeance . The obtained TFNi-10 intermediated with a moderate amount of CNTs (10 μg/cm 2 ) exhibited 80.5 % higher selectivity of Ca 2+ over SO 4 2− and 156 % higher water permeance compared to the control TFC while maintaining a high PFOA rejection (∼97.3 %). For the gypsum scaling measurements, TFNi-10 showed better anti-scaling behavior and 40 % less pressure energy consumption for the same recovered water volume (2.2 L), resulting in the higher water recovery and lower energy cost of specific volume of the permeate. It was contributed by the synergistic effects of the strong affinity of TA-Fe to piperazine monomer and the gutter effect of TA-Fe/CNTs interlayer . Our results paved a new way of fabricating novel NF membrane with tailored intermediate layer for optimized interfacial polymerization to realizing groundwater remediation in a cost-effective manner.
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DALTON TRANSACTIONS
·
2022
·Vol. 52
·期 6
·1680-1686
·
IF 4.569
Xinyao Ding,Mingyi Zhang,Xin Chang,Xuejiao Zhou
The energy industry is placing more and more emphasis on the need for effective and affordable electrocatalysts for hydrogen evolution reactions (HER). In this work, an iron-doped NiS/Ni(OH)2/CC composite material was synthesized by simple hydrothermal sulfurization processes of bimetallic Prussian blue analogue (PBAs) precursors grown in situ on three-dimensional (3D) Ni(OH)2 nanosheets. The overpotential can be 103 mV to attain current densities of 10 mA cm−2. The excellent catalytic activity of Fe-NiS/Ni(OH)2/CC is because of the unique 3D structure and the uniform doping of iron caused by the in situ growth of PBA, as well as the high conductivity of the self-supported electrode carbon cloth.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Yifan Liang,Zengrui Pan,Jianlong Sheng,Yongjiong Ni,Jun Li
To enhance nitrogen removal in wastewater treatment , a novel method of wrapping waste iron shavings (Fe-C) in polyurethane sponge cubes tied in anoxic zones of a continuous reactor was proposed. Three types of denitrifying bacteria were enriched simultaneously in biofilms and activated sludge , including iron autotrophic denitrifying bacteria (7.83–8.71 %), heterotrophic denitrifying bacteria (10.60–11.95 %), and heterotrophic nitrification-aerobic denitrifying bacteria (23.47–40.06 %). Iron autotrophic denitrifying bacteria ( Dechloromonas and Sphaerotilus ) can remove NO 3 − -N using Fe 2+ as electron donor produced by micro-electrolysis of iron shavings without organic carbon demand, and heterotrophic nitrification-aerobic denitrifying bacteria ( Ferribacterium and Zoogloea ) can simultaneously accomplish nitrification and denitrification under aerobic conditions . The enrichment of these two functional bacteria strengthened the nitrogen removal performance compared to conventional heterotrophic denitrifying process, which could achieve efficient and stable total nitrogen removal (87.4 %) even with low organic carbon. In addition, the synergy of biological and chemical processes through Fe-C micro-electrolysis also enhanced total phosphorus removal (86.0 %).
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CHEMOSPHERE
·
2023
·
IF 8.8
Sini Lv,Fengzhen Zheng,Zeyu Wang,Luyao Dai,Huan Liu,Dzmitry Hrynshpan,Tatsiana Savitskaya,Jun Chen
The high hydrophobicity of n -hexane is the main reason why it is difficult to be removed biologically. In this study, the effects of bamboo-charcoal modified by bimetallic Fe/Pd (BBC) on n -hexane biodegradation by Pseudomonas mendocina NX-1 (PM) was investigated. The n- hexane removal efficiency was increased in the presence of BC. The highest n- hexane removal efficiency at 90.0% was achieved at 0.05 g L −1 BCE and 3 g L −1 NH 4 + under pH 7.7 and 35 °C. Additionally, protein content (45.9 μg mL −1 ) and negative cell surface zeta potential (−26.4 mV) were increased during biodegradation process, with PM-BBC being 43.1 μg mL −1 and 19.1 mV. Bacterial growth was improved and maximum cell surface hydrophobicity was obtained after 20 h, which was 59.4% higher than the control with PM-BBC (37.7%) or PM (16.1%), showing biodegradation products of 1-butanol and acetic acid. The results indicate that BBC improved n- hexane biodegradation efficiency by promoting bacterial growth, reducing cell zeta potential, exposing hydrophobic proteins, and increasing cell surface hydrophobicity of bacterial strain NX-1. This investigation suggests that BBC-enhanced biodegradation can be promising to treat n- hexane-containing gas.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jun Liu,Hui Wang,Meng-Jie Chang,Wen-Juan Li,Wen-Yao Zhu,Ge Bai,Liu-Qing Yang,Hui-Ling Du,Zhen-Min Luo,Ting Shang
Metal ion doping is an efficient method to achieve high photocatalytic performance of semiconductors. However, the current synthetic methods by using inorganic salts as doped sources in the precursor reaction system might suffer from ion waste and second pollution. Herein, we developed a novel method by employing electrospun nanofibers as ion reservoir to release metal ions for the synthesis of ion-doped semiconductors with high photocatalytic activity . As demonstrated, Co/Fe co-doped BiOCl photocatalyst (Co/Fe-BOC) was facilely prepared in the presence of CoFe 2 O 4 nanofibers as Co and Fe ion reservoir via a simple solvothermal method . Compared with BiOCl, the resulted Co/Fe-BOC shows increased specific surface area, visible light response as well as separation and transportation efficiencies of photogenerated carriers. Thus, the Co/Fe-BOC exhibits significantly enhanced visible light photocatalytic activity to degrade 99.4% rhodamine B (RhB) within 4 min. This new doping approach not only avoids the ion waste and pollution during the reaction process but also facilitates the separation of the photocatalyst. Moreover, the CoFe 2 O 4 nanofibers could be repeatedly used as ion reservoir to prepare high-performance Co/Fe-BOC. This nanofiber-based ion doping approach provides a novel, universal and promising insight to obtain doped semiconductors with high photocatalytic activity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hao Xu,Lihui Xiao,Peixia Yang,Xiangyu Lu,Lilai Liu,Dan Wang,Jinqiu Zhang,Maozhong An
Zeolitic imidazole framework (ZIF)-derived iron–nitrogen-carbon (Fe N C) materials are expected to be high-efficiency catalysts for oxygen reduction reaction (ORR). However, increasing the density of active sites while avoiding metal accumulation still faces significant challenges. Herein, solvent environment engineering is used to synthesize the Fe N C containing dense Fe-N x moieties by adjusting the solvent during the ZIF precursor synthesis process. Compared with methanol and water/methanol, the aqueous media can provide a more moderate Fe content for the ZIF precursor, which facilitates the construction of high-density Fe-N x sites and prevent the appearance of iron-based nanoparticles during pyrolysis. Therefore, the Fe N C(C) nanocubes synthesized in an aqueous media have the highest single atom Fe loading (0.6 at%) among the prepared samples, which presents excellent oxygen reduction properties and durability under alkaline and acidic conditions. The advantage of Fe N C(C) is proven in Zn-air batteries, with outstanding performance and long-term stability.
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ACS Omega
·
2023
·
IF 4.1
Qiyue Zhang,Aori Qileng,Jiale Li,Yiran Cao,Weipeng Liu,Yingju Liu
Organic dyes can produce harmful effects on the water environment, such as affecting the growth of aquatic organisms, reducing the transparency of water bodies, and causing eutrophication of water bodies, so it is necessary to mitigate the hazards of organic dyes. In this study, a metal–organic framework [NH2-MIL-101(Fe)] was synthesized by the solvothermal method as a carrier for the in situ uniform deposition of AgCl nanoparticles on its surface, which was successfully used for both adsorption and degradation of Congo red. Adsorption results showed that the adsorption kinetics conformed to the proposed secondary adsorption kinetics equation with a maximum adsorption capacity of 248.4 mg·g–1. Furthermore, the degradation results indicated that with the aid of sodium borohydride as a reducing agent, the degradation of Congo red followed pseudo-first-order kinetics with a degradation rate of 0.077 min–1, and the complete degradation of Congo red was finished within 18 min. Therefore, AgCl/NH2-MIL-101(Fe) may find a potential application in the removal of dyes from wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuqing Pan,Na Li,Ke Li,Shiyuan Ran,Chenyang Wu,Qulan Zhou,Jiyuan Liu,Shuzhou Li
The industrial applications of de-NOx require the high activity window of the catalysts to be shifted from high to low temperatures for energy saving. Selective catalytic reduction (SCR) of NOx by CO, as an alternative to NH 3 -SCR, is a promising de-NOx technology that facilitates the synergistic removal of pollutants. Herein, we report a new Fe 2 O 3 /amorphous SiO 2 catalyst with high low-temperature activity for CO-SCR. A combination of experiments and density functional theory (DFT) calculations obtains direct evidence that an optimal content of oxygen vacancy enhances the low-temperature NO conversion ratio and N 2 selectivity of Fe 2 O 3 -based catalyst to over 80% and maintain 100% CO conversion by promoting NN coupling via ONNO/N 2 O and NCO/NNCO 2 intermediates. Compared with conventional defect engineering, such as doping other metals or artificially generating oxygen defects, the α-Fe 2 O 3 (1 1 0) facet automatically enables an oxygen vacancy generation-filling cycle in the CO-SCR reaction, following Mars-van Krevelen (MvK) mechanism. This work advances a fundamental understanding of CO-SCR reaction mechanism over Fe 2 O 3 -based catalysts and provides insights for future studies to improve heterogeneous metal oxide catalysts.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Dongqin He,Dongli Wang,Hongwei Luo,Yifeng Zeng,Ganning Zeng,Jun Li,Xiangliang Pan
The most important factor that restricts the decomposition of H 2 O 2 in the Fe 3+ /H 2 O 2 reaction is the slow cycling efficiency of reducing Fe 3+ to Fe 2+ . In this study, the addition of tungsten disulfide (WS 2 ) as a co-catalyst achieved a rapid cycling of the reaction rate-limiting step and a significant enhancement of H 2 O 2 decomposition, which resulted in the effective degradation of acetaminophen (APAP). Results show that 99.6% of APAP (5 mg L −1 ) could be degraded by H 2 O 2 /Fe 3+ /WS 2 system within 2.5 min. The conversion of Fe 3+ to Fe 2+ occurred mainly on the surface of WS 2 due to the redox reaction of the exposed W 4+ active sites with Fe 3+ after the unsaturated S atoms were bound to protons. Electron paramagnetic resonance (EPR) and radical quenching experiments evaluated the contribution of hydroxyl radical (•OH) and superoxide radical (O 2 • − ) in the degradation of pollutants. WS 2 showed good recoverability after four cycles of the reaction. This study provides a new perspective to improve the efficiency of Fe 3+ /H 2 O 2 and provides a reference for the involvement of transition metal sulfides in advanced oxidation processes (AOPs).
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Nanomaterials
·
2023
·Vol. 13
·期 3
·487
·
IF 5.3
Xiaolei Shang,Xiaoling Men,Qifeng Kuang,Shaojie Li,Da Li,Zhidong Zhang
Organic–inorganic hybrid materials built by inorganic and organic building units have attracted intensive interest in the past decades due to unique chemical and physical properties. However, rare organic–inorganic hybrid materials show excellent permanent magnetic properties. Here, we develop a facile chemical solution method to bottom-up synthesize a new hybrid (Fe2Se3)2[Fe(dien)2]0.9. This hybrid phase with the space groupP21/c(14) possesses a rodlike shape with a diameter of 100–2000 nm and a length of 5–50 µm. The hybrid rods are ferrimagnetic with a Curie temperature (TC) of 11 K. They show a high coercivity (HC) of 4.67 kOe and a saturation magnetization (MS) of 13.5 emu/g at 2 K. Compared with orthorhombic (FeSe2)2Fe(dien)2, the excellent magnetic performance of the hybrid rods is ascribed to the monoclinic hybrid structure built by Fe(dien)2complexes and Fe2Se3double chains. Our study provides guidance for connecting inorganic fragments of FeSe2single chains, Fe2Se3double chains or β-Fe3Se4layers with Fe(dien)2complexes for organic–inorganic hybrid phases with varied crystal structures and magnetic properties.Keywords:organic–inorganic hybrid materials;chemical solution method;Fe2Se3double chains;coercivity
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Ying Li,Rida Javed,Rui Li,Yuyang Zhang,Ziyue Lang,Hongbin Zhao,Xing Liu,Hongmei Cao,Daixin Ye
Ascorbic acid is one of the important vitamins to maintain human life activities and plays an irreplaceable role in regulating human redox metabolism. Fresh fruit can provide plenty of AA to maintain human metabolic balance. Thus, it is great significant to develop a rapid and convenient method for detection of AA to evaluate the freshness and nutritional quality of fruits. In this work, Fe single-atom nanoenzyme (Fe-SAN) based colorimetric sensor assisted with smartphone was designed for rapid and on-site AA detection in tropical fruits. Firstly, Fe-SAN with high oxidase-mimicking activity was synthesized by using green tea leaves as sources of carbon and nitrogen and NaH 2 PO 2 as P source to obtain Fe-P/N C SAN, in which P was used to reconstruct the distribution of electronic to enhance the oxidase-mimicking activity of Fe-SAN. Besides, the as-synthesized Fe-P/N C SAN with remarkable oxidase-like activities could oxidize 3,3́,5,5́-tetramethylbenzidine (TMB) to blue colored oxidized TMB. AA could inhibit the oxidation of TMB, leading to blue fading. Based on the above principle, colorimetric sensor integrated with smartphone RGB mode was fabricated and exhibited a good linear detection range (0.5–100 μM) and low detection limit of 0.315 μM for AA detection under optimal conditions. More importantly, the developed sensor could rapidly and accurately detect AA in real sample, such as pineapple, wax apple and mango. Therefore, this research provides a new cost-effective method for the efficient and exact detection of AA in tropical fruit, which has a broad application prospect.
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