Journal of Water Process Engineering
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2022
·
IF 7.34
Yatong Li,Xinbo Zhang,Huu Hao Ngo,Wenshan Guo,Dan Zhang,Huizhong Wang,Tianwei Long
Applying membrane technology to water purification has been done for several decades now and is widespread. However, membrane fouling is a serious problem and continues to limit the success of membrane processes. In this study, magnetic biochar (Fe-BC) was prepared using easily available spent coffee grounds to activate peroxymonosulfate (PMS) as a UF membrane pretreatment strategy. Results showed that the average removal rates of humic acid (HA, 10 mg/L) were 55.23 % and 73.55 %, at the Fe-BC dosage of 300 mg/L and PMS dosage of 300 mg/L and 900 mg/L, respectively. The Fe-BC/PMS pretreatment significantly reduced the total (44 %) and reversible (61 %) UF membrane fouling after five filtration cycles at a relatively high flux of 200 L/m 2 ·h, and the Fe-BC and PMS dosage of 100 mg/L. Modeling fit results indicated that pretreatment shifted complete blocking to standard blocking. Therefore, stopping HA-induced membrane fouling could be possible if the load is reduced and complete blocking alleviated.
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ADVANCED POWDER TECHNOLOGY
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2022
·
IF 4.969
Xubin Li,Yaqiang Dong,Shouding Wu,Ronglin Zhao,Qian Ding,Xingjie Jia,Aina He,Jiawei Li,Xincai Liu
In this work, transverse magnetic field annealing (TA) was performed to FeSiBNbCu nanocrystalline powder cores (NPCs), and the magnetic properties, microstructure, and magnetic domain structure were in detail studied comparing with those after normal annealing (NA), and the mechanism of the improvement of soft magnetic properties by TA was elucidated. The experimental results show that the core loss of the sample is reduced by 14 % and the coercivity is reduced by 38 % after TA at 450 °C compared to the NA sample. The direct current bias performance of the TA sample is maintained at 67 % under a 100 Oe bias field. TA optimizes the soft magnetic properties of NPCs by optimizing the domain structure, reducing the formation of micro-vortex dots and broadening the size of the domain. These results can provide a good guide for optimizing the performance of NPCs with low core loss at high frequency.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Dong Zhang,Wenqiang Yang,Zhenbin Wang,Cong Ren,Yao Wang,Mingyue Ding,Tong Liu
Electrochemical carbon dioxide reduction reaction (CO 2 RR) via a solid oxide CO 2 electrolyzer has been attracting increasing attention because it can effectively convert CO 2 into high value-added chemical products and efficiently store the excessive electricity. However, the lack of efficient electrodes to catalyze this reaction process severely limits their practical applications. Herein, we report Ru promoted perovskite type Pr 0.4 Sr 0.6 Fe 0.9 Mo 0.1 O 3-δ with a general formula of Pr 0.4 Sr 0.6 Fe 0.8 Ru 0.1 Mo 0.1 O 3-δ (Ru-PSFM) cathode to overcome the constraints of low current density, low Faradaic efficiency, and high overpotential of CO 2 RR. The cathode electrolysis current density of CO 2 RR at 800 °C and 2.0 V is considerably improved from 0.707 to 1.480 A cm −2 with an enhancement rate of 109%, while its corresponding electrode polarization resistance at 1.4 V is significantly lowered from 2.228 to 0.319 Ω cm −2 . Furthermore, the solid oxide CO 2 electrolyzer exhibits superior stability during the operation. Distribution of relaxation times analysis results reveal that the rate-determining process, involving CO 2 adsorption, dissociation, and activation on the cathode surface, is significantly activated and dramatically accelerated after Ru doping. Density function theory calculations demonstrate that the in-situ exsolved Fe-Ru alloy nanocatalyst is a more favorable site for the activation of CO 2 dissociation. This work provides valuable insights into the rational design of efficient cathodes for CO 2 RR.
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Journal of Cleaner Production
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2022
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IF 11.072
Mingjun Xu,Qian Zhang,Ziqi Zhu,Yuwei Xue,Ting Zhang,Junming Hong
Prussian blue analogs (PBAs) have been widely explored as catalyst for peroxymonosulfate (PMS) activation. However, the drawbacks of poor electron transfer ability and degradation performance of PBAs hinder their practical application. In this study, oxygen vacancy (OV)-rich Mn-Fe PBA was regulated through phosphoric acid and ammonia water chemical etching to overcome these drawbacks. Experimental and theoretical investigations indicated that the regulation of OVs was favorable for more Fe 2+ and Mn 3+ active sites exposure and higher specific surface area to facilitate PMS activation. Sulfate radical (SO 4 •− ), hydroxyl radical (HO•), and single oxygen ( 1 O 2 ) were verified as main reactive species for PMS activation during catalytic reaction . Density functional theory calculation results showed that the OV-rich NOE-PC-300 had the highest pollutants degradation capability, with complete degradation of bisphenol A (BPA) and acetaminophen (APAP) within 40 min. Through regulation of OVs by chemical etching, highlighted adsorption ability and elongated O–O bond of PMS were obtained. This research showed that NOE-PC-300 is an efficient and harmless catalyst for activating PMS, and it has immense application potential in practical wastewater treatment .
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ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Jiabi Xu,Jiayi Peng,Xiangting Wang,Xiaohong Hou
Nanozymes have gradually become a research hotspot in the field of enzymology, benefiting from their low cost, high stability, and availability. To break through the limitation that conventional nanozymes exert peroxidase-like (POD-like) activity under only acidic conditions, we rationally designed Fe3O4@MIL-100(Fe) with excellent superparamagnetism and catalytic activity. An optimization of the microwave-assisted in situ synthesis conditions was carried out to obtain the highest POD-like activity of the nanozyme under nearly neutral conditions. Adenosine triphosphate (ATP) was appointed as an auxiliary regulator to further amplify the activity of the nanozyme Fe3O4@MIL-100(Fe). A series of behaviors related to enzymology and the mechanism of ATP-assisted enhancement were further explored. Consequently, a colorimetric sensing strategy was proposed for the one-step detection of cholesterol with a linear range of 0.05–0.4 mM and a limit of detection (LOD) of 1.3 μM (3.3 δ/S). The result of the present work implied that the established one-step platform could be successfully applied to the detection of cholesterol in actual samples. From the nanozyme synthesis to the colorimetric sensing process, the concepts of time savings and straightforwardness were always upheld and satisfactorily implemented. Most importantly, Fe3O4@MIL-100(Fe) could be a great potential biocatalyst candidate for the development of the corresponding commercial kits.
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JOURNAL OF FLUORESCENCE
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2022
·Vol. 32
·期 5
·1743-1754
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IF 2.525
Xu Ouwen,Wan Shuyu,Yang Jing,Song Hanyang,Dong Luzheng,Xia Ji,Zhu Xiashi
In this work, an “on-off-on” fluorescent probe based on Ni-MOF functionalized Nitrogen-doped carbon quantum dots (Ni-MOF-NCDs) was developed. Ni-MOF-NCDs was characterized by FT-IR, TEM, SEM, and XPS. The presence of Fe (III) will reduce the fluorescence intensity of Ni-MOF-NCDs and “turn off” the fluorescence signal at emission peak of 390 nm, while the signal can be “turn on” after the addition of ascorbic acid (AA). The Ni-MOF-NCDs was established as an “on-off-on” fluorescent probe for the detection of Fe (III) and AA with the linear ranges of 0.029-8.0 µg/mL and 0.263-18.0 µg/mL, respectively. The method has been successfully applied to the detection of water samples and foods with satisfactory recovery. The experimental results showed that Ni-MOF-NCDs not only had the fluorescence properties of NCDs, but also had the adsorption performance of Ni-MOF.
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MICROCHIMICA ACTA
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2022
·Vol. 189
·期 9
·1-13
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IF 6.408
Chen Jing,Li Shuying,Chen Ying,Yang Jiao,Dong Jianbin
Adenine (A) and guanine (G) are mainly found in deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) and play a crucial role in genetic information transfer and protein synthesis. In this study, NH 2 -MIL-53(Fe)/CS/MXene nanocomposites were prepared for detecting guanine and adenine. With high specific surface area, excellent water dispersion, and numerous active sites, MXene (transition metal carbides, nitrides, and carbonitrides) provides a good platform for loading primitive metal-organic frameworks (MOFs). At the same time, the problem of poor conductivity and dispersion of MOFs is solved. The electrochemical catalytic oxidation of adenine and guanine of NH 2 -MIL-53 (Fe)/CS/MXene nanocomposites was carried out by differential pulse voltammetry (DPV). Operating voltage of DPV: 0.7–0.9 V (vs. Ag/AgCl) for G, 1.0–1.2 V (vs. Ag/AgCl) for A, 0.8 V (vs. Ag/AgCl), and 1.1 V (vs. Ag/AgCl) for G and A. The concentration ranges for detecting A and G were 3–118 μM and 2–120 μM with detection limits of 0.57 μM and 0.17 μM (S/N = 3), respectively. The nanocomposite was used for detecting G and A in herring sperm DNA, and the content of G and A was found to be about 9 and 11 μM; the RSD values were 3.4 and 1.3%, respectively. Graphical abstract
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Journal of Environmental Sciences
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2022
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IF 6.796
Xuedong Du,Wenyang Fu,Pei Su,Qizhan Zhang,Minghua Zhou
An ultra-efficient electro-Fenton catalyst with porous carbon coated Fe-Mo metal (FeMo@PC), was prepared by calcining MIL-53(Fe)@MoO 3 . This FeMo@PC-2 exhibited impressive catalytic performance for sulfamethazine (SMT) degradation with a high turnover frequency value (7.89 L/(g·min)), much better than most of reported catalysts. The mineralization current efficiency and electric energy consumption were 83.2% and 0.03 kWh/g TOC , respectively, at low current (5 mA) and small dosage of catalyst (25.0 mg/L). The removal rate of heterogeneous electro-Fenton (Hetero-EF) process catalyzed by FeMo@PC-2 was 4.58 times that of Fe@PC/Hetero-EF process. Because the internal-micro-electrolysis occurred between PC and Fe 0 , while the co-catalysis of Mo accelerated the rate-limiting step of the Fe 3+ /Fe 2+ cycle and greatly improved the H 2 O 2 utilization efficiency. The results of radical scavenger experiments and electron paramagnetic resonance confirmed the main role of surface-bound hydroxyl radical oxidation. This process was feasible to remove diverse organic contaminants such as phenol, 2,4-dichlorophenoxyacetic acid, carbamazepine and SMT. This paper enlightened the importance of the doped Mo, which could greatly improve the activity of the iron-carbon heterogeneous catalyst derived from metal-organic frameworks in EF process for efficient removal of organic contaminants.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 6
·060547
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IF 4.386
Ruixiang Wang,Yanyang Wang,Zheqin Chen,XiaoCong Zhong,Yongmin Xie,Xiaobo Ji,Jiaming Liu,Shubiao Xia,Zhifeng Xu
Transition metal/nitrogen carbon composite (M/NC) is a highly active oxygen reduction reaction (ORR) electrocatalyst, widely used in fuel cells and zinc-air batteries. Herein, a uniform and regular PVP-assisted iron-doped nano dodecahedron (ZP0.1F/NC) is prepared by a simple and efficient one-step in-solution reaction, followed by controlled in situ pyrolysis. The synthesized electrocatalyst showed excellent electrocatalytic ORR activity in an alkaline medium. Compared with standard 20% Pt/C electrocatalyst, ZP0.1F/NC exhibited onset potential (Eonset) (0.974 V vs 0.967 V), half-wave potential (E1/2) (0.861 V vs 0.857 V) and the limiting current density (jd) was 6.373 mA cm−2 vs 5.401 mA cm−2, also better than the Fe doped ZIF-8 nitrogen composite (ZF/NC), PVP auxiliary ZIF-8 (ZP0.1/NC) and pure ZIF-8 nitrogen composite (Z/NC) synthesized by the same procedure. In addition, the zinc-air battery assembled with ZP0.1F/NC also exhibits outstanding discharge capacity, with a specific capacity and energy density of 793.3 mAh g−1 and 974.9 Wh kgZn−1, respectively, much higher than that of commercial 20% Pt/C-based zinc-air battery (719.8 mAh g−1, 842.6 Wh kgZn−1), indicating its great potential in practical energy conversion and storage.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Yuanyuan Yang,Xiaofei Tan,Eydhah Almatrafi,Shujing Ye,Biao Song,Qiang Chen,Hailan Yang,Qianmin Fu,Yuanyuan Deng,Zhuotong Zeng,Guangming Zeng
Polluted stormwater (PSW) treatment is becoming increasingly important because of the existence of multiple pollutants from non-point pollution sources. Alfalfa biochar loaded with Mg/Fe layered double hydroxide (AF-LDH) was successfully synthesized to remove trace metal(loid)s from stormwater. The adsorption kinetics and isotherms of metal(loid)s in a mono-component system and the reusability of the composite materials was investigated in this study. The result showed that the maximum removal efficiency for Pb(II), Cu(II), Zn(II), Cd(II), As(V), and Cr(VI) were 98.98 %, 98.11 %, 97.88 %, 97.71 %, 98.81 %, and 50.89 %, respectively, when added calcined AF-LDH (AF-LDO) composite material to the multi-component solution. The AF-LDH and AF-LDO could efficiently remove trace pollutants (10‐100 μg/L) from multi-component solution, especially for AF-LDO, which could completely remove the tested six trace metal(loid)s. Furthermore, Fourier transform infrared spectra and X-ray diffraction characterizations supported the Mg/Fe layered double hydroxide reconstruction. The main mechanisms of Pb(II), Cu(II), Zn(II), and Cd(II) (cationic metals) removal were ion exchange and surface precipitation, whereas As(V) and Cr(VI) (anionic metals) were mainly dislodged through the formation of surface complexation, electrostatic attraction, and interlayer anion exchange, concerning the –OH and –COOH of AF-LDH. Importantly, the results of the column experiment demonstrated that AF-LDO was superior to AF-LDH for anionic metal removal from stormwater. In this study, we synthesized AF-LDH and AF-LDO for trace metal(loid) removal and proposed a new and practical approach for stormwater purification.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Shuochao You,Yihui Wu,Yuxin Wang,Zhen He,Li Yin,Yuan Zhang,Zesheng Sun,Zejie Zhang
The development of extremely active bifunctional non-noble electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is pivotal for water splitting but remains challenging. Herein, self-supported Ni–Fe–Sn electrocatalysts were fabricated on nickel foam (NF) through a simple and facile pulse electrodeposition process. Under optimal conditions, the prepared Ni–Fe–Sn electrocatalysts exhibited excellent bifunctional properties in alkaline medium and required ultralow overpotentials of only 27 and 201 mV for HER and OER, respectively, to reach the current density of 10 mA cm −2 . Importantly, the same Ni–Fe–Sn electrocatalyst can be assembled as the anode and the cathode in a two-electrode system. It demanded a fairly low applied voltage of 1.55, 1.72, and 1.87 V to produce 10, 50, and 100 mA cm −2 , respectively, and exhibited excellent long-term stability. The excellent electrocatalytic water splitting performance of the Ni–Fe–Sn film was mainly associated with its intrinsic catalytic activity derived from the modulation of the electronic structures among Ni, Fe, and Sn by using the appropriate atomic ratio of Ni: Fe: Sn.
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JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 5
·1489-1505
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IF 2.523
Chang Ziling,Li Huafei,Yang Yuxiang,Yuan Hongming,Huang Yan,Yao Pingping,Ni Chaoying
Herein, we developed the dual-function template method to fabricate hollow magnetic nano-spheres (denoted as HMFe–Si–C n , n = 16, 18) with a mesoporous shell and hollow interior structure using alkyl chain trimethoxysilane templating. The shorter chain template directed formation of HMFe–Si–C 16 with size of 119 nm, having disordered inkbottle type mesopores and saturation magnetization of 50.01 emu/g higher than that of HMFe–Si–C 18 with cylindrical type mesopores. In addition, the HMFe–C n loaded with MMC diaplays a pH and magnetic dual responsive drug release behavior. By contrast, Mitomycin C (MMC) loading efficiency of HMFe–Si–C 16 was higher owing to the fact that the pore size, surface area, and pore volume of HMFe–Si–C 16 were larger than those of HMFe–Si–C 18 . Besides, MMC loaded HMFe–Si–C n hollow spheres showed a clear pH-dependent drug release behavior, having a higher release rate in acidic environments of pH 5.7. For the pH 5.7 and 7.4 release, the release kinetic for HMFe–Si–C 16 –MMC composites follows pseudo-first-order attributable to its special pore structure. With Fe(0) as a core, HMFe–Si–C n is distinguished for higher magnetic properties, and it is more conducive to magnetic targeted treatment of cancer cells and can release drugs through external magnetic field. In addition, HMFe–Si–C n has lower cytotoxicity and better biocompatibility. For this reason the inner cavity of HMFe–Si–C 16 could be labeled with radioisotope 99 Tc m to study the magnetic targeting distribution of HMFe–Si–C 16 in vivo, and its cytotoxicity against in vitro HeLa cells was also studied. These results indicate the potential of HMFe–Si–C 16 in the magnetic targeted drug delivery system.
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