CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Yongqing Zhang,Hien Phuong Tran,Xiaodong Du,Imtyaz Hussain,Shaobin Huang,Shaoqi Zhou,William Wen
In recent years, persulfate activation systems have received increasing attention due to their high oxidation reactivity when removing environmental pollutants. Pyrite, the most common metal sulfide on Earth’s surface, can supply abundant Fe 2+ for persulfate activation. The role of the generated reactive oxygen species (ROS) in persulfate-pyrite systems however, is not fully understood. In this study, batch experiments were used to investigate p -chloroaniline (PCA) degradation by a pyrite-persulfate system. The effects of pyrite dosage, pH, temperature, air conditions (aerobic vs. anaerobic) and pyrite particle size on PCA degradation were examined. Radical detection was conducted using electron paramagnetic resonance (EPR) methods. Results from the EPR spectra indicated that PCA degradation was achieved by sulfate radical and hydroxyl radical oxidation. Aerobic conditions were more beneficial to PCA degradation than anaerobic conditions due to the generated superoxide radicals (O 2 − ) that activated the persulfate to produce more sulfate radicals (SO 4 − ). PCA degradation also increased with higher pyrite doses and under acidic conditions (pH 3.0 and 5.0). PCA was removed completely at pH 3.0 after 60 min. Temperature increase from 10 to 50 °C significantly promoted PCA degradation. These findings provide new understanding of the mechanism involved in pyrite activation of persulfate which can be used to improve PCA degradation by pyrite-persulfate systems.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2017
·
IF 1.174
Jianhua Chen,Xue Sun,Lijing Lin,Xinfei Dong,Yasan He
In the present paper, a metal–organic framework Cr-BDC was prepared and used as adsorbent for adsorption of o -nitrophenol (ONP) and p -nitrophenol (PNP) from aqueous solutions. Cr-BDC was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and BET methods. The results indicate that Cr-BDC gets a very large specific surface area of 4128 m 2 ·g − 1 and pore sizes are concentrated in 1 nm, which is a benefit for using for wastewater treatment . The influences of the adsorption conditions, such as temperature, solution concentration, adsorption time and reusability on adsorption performance were investigated. Cr-BDC exhibited an encouraging uptake capacity of 310.0 mg·g − 1 for ONP, and adsorption capacity of Cr-BDC for ONP is significantly higher than that for PNP under suitable adsorption conditions. The characterizations of adsorption process were examined with the Lagergren pseudo-first-order, the pseudo-second-order kinetic model, and the intra-particular diffusion model. Kinetics experiments indicated that the pseudo-second-order model displayed the best correlation with adsorption kinetics data. Furthermore, our adsorption equilibrium data could be better described by the Freundlich equation. The results indicate that the as-prepared Cr-BDC is promising for use as an effective and economical adsorbent for ONP removal.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Xia Kang,Zhendong Wang,Fu Yang,Shijie Kang,Dazhong Ren
Hydrazine borane (N 2 H 4 BH 3 , HB) is gaining significant attention as a promising chemical hydrogen storage material due to its high hydrogen content (15.4 wt%). However, the challenge of achieving complete dehydrogenation of HB at room temperature has hindered its practical application in the hydrogen economy. In this study, we successfully develop P-doped RhCo alloy supported by carbon nanotubes (Rh 0.5 Co 0.5 -P/CNTS). Surprisingly, the Rh 0.5 Co 0.5 -P/CNTS catalyst exhibits exceptional performance, achieving complete dehydrogenation of HB within 1.03 min at 303 K, with a turnover frequency value of 2913 h -1 , outperforming the previously reported results. The large specific surface area and modified electronic structure of Rh 0.5 Co 0.5 -P/CNTS provided by the CNTS and P enhance the accessibility of reactants to the active sites, optimize the adsorption and activation of HB molecules, and finally enhance the catalytic activity.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 43
·e2407579121
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IF 9.4
Xiaoge Liang,Dian Chen,Aimin Su,Yu Liu
Ribonuclease P (RNase P) plays a vital role in the maturation of tRNA across bacteria, archaea, and eukaryotes. However, how RNase P assembles various components to achieve specific cleavage of precursor tRNA (pre-tRNA) in different organisms remains elusive. In this study, we employed single-molecule fluorescence resonance energy transfer to probe the dynamics of RNase P from E. coli (Escherichia coli) and Mja (Methanocaldococcus jannaschii) during pre-tRNA cleavage by incorporating five Cy3-Cy5 pairs into pre-tRNA and RNase P. Our results revealed significant differences in the assembly and catalytic mechanisms of RNase P between E. coli and Mja at both the RNA and protein levels. Specifically, the RNA of E. coli RNase P (EcoRPR) can adopt an active conformation that is capable of binding and cleaving pre-tRNA with high specificity independently. The addition of the protein component of E. coli RNase P (RnpA) enhances and accelerates pre-tRNA cleavage efficiency by increasing and stabilizing the active conformation. In contrast, Mja RPR is unable to form the catalytically active conformation on its own, and at least four proteins are required to induce the correct folding of Mja RPR. Mutation experiments suggest that the functional deficiency of Mja RPR arises from the absence of the second structural layer, and proper intermolecular assembly is essential for Mja RNase P to be functional over a broad temperature range. We propose models to illustrate the distinct catalytic patterns and RNA–protein interactions of RNase P in these two organisms.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Daiyao Jiang,Tingting Wei,Kai Li,Fei Wang,Xin Sun,Jie Zhao
In this study, novel mixed matrix membranes (MMMs) composed of MoO 3 /Poly (vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) with distinctive piezo-photocatalytic properties were prepared. The membranes were made from dopes containing a high ratio of MoO 3 to P(VDF-TrFE) (2:1 wt%/wt%) through a modified solvent evaporation method. The addition of MoO 3 particles significantly impacted the crystallization and self-polarization of the P(VDF-TrFE) matrix, leading to a substantial increase in total crystallinity from 46.4% to 88.9% and a transformation from α to β phase. The flow-induced piezoelectric potential created an internal electric field, enhancing the spatial separation of photogenerated carriers through the piezoelectric effect. Controlled water flow further promoted the spatial separation of carriers. The developed MMMs demonstrated a high Rhodamine B degradation rate, reaching 83.1% within 45 minutes and over 99% within 90 minutes under natural light conditions. The MoO 3 /P(VDF-TrFE) MMMs exhibit promising piezo-photocatalytic attributes and hold potential for diverse applications due to their unique combination of piezoelectric and photocatalytic properties.
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Green Chemical Engineering
·
2024
·
IF 9.1
Ruichang Xue,Rongrong Deng,Yan Li,Mengqiu Gao,Jiafu Wang,Qibo Zhang
Developing electrocatalysts with excellent activity, high stability, and low cost is vital for large-scale hydrogen production through electrochemical water splitting. Herein, a bifunctional Ni–Fe–P catalyst in situ grown on Fe foam (Ni–Fe–P/FF) is developed by a simple one-step solvothermal process in the deep eutectic solvent (DES) of ethylene glycol and choline chloride (named Ethaline). The unique solvent environment of Ethaline assisted with the regulating effect of the introduced Fe(III) ions shows an essential role in governing the preparation process. The developed Ni–Fe–P/FF acts as the efficient bifunctional electrocatalyst for water splitting in 1.0 M KOH, requiring overpotentials of 82 mV (229 mV) and 263 mV (370 mV) to deliver 10 mA cm −2 (100 mA cm −2 ) for oxygen and hydrogen evolution reactions, respectively. Furthermore, the self-supported catalyst-assembled electrolyzer also exhibits good catalytic performance with a low voltage of 1.83 V to drive 100 mA cm −2 and good stability over 100 h. This work offers a facile approach to fabricating high-performance bifunctional Ni–Fe–P electrocatalysts to catalyze water splitting.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 19
·16220-16227
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IF 2.741
Xu Xiangyang,Gao Xinyi,Jin Jie,Vidonish Julia,Zhu Liang
A novel laboratory-scale bioelectrode and anaerobic sludge coupled system was established for the enhancement of p -chloronitrobenzenes ( p -ClNB) reductive transformation with addition of magnetite nanoparticles. In this coupled system, the bioelectrodes were supplied with a voltage of 0.8 V and the amount of magnetite nanoparticles was set at 7.4 mL/400 mL. Results showed that high p -ClNB transformation rate of 0.284 h −1 and high p -chloroaniline ( p -ClAn) dechlorination rate of 0.082 h −1 were achieved in the coupled system at p -ClNB initial concentration of 30 mg L −1 , and p -ClAn is one of the reductive products of p -ClNB. The cyclic voltammetry curve showed that when the potential was −1000 mV, the magnetite-biocathode current was about 10.7 times of the abiotic cathode. Also, a shift in the reductive peak potential and a dramatic increase in reductive peak current were observed. These findings suggest that magnetite nanoparticles could enhance the electrocatalytic activity and may act as electron conduits between microorganisms or between electrodes and microorganisms to promote the extracellular electron transfer.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
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IF 19
Yuqing Tian,Wei Wei,Zhouquan Sun,Yunhao Hu,Kerui Li,Qinghong Zhang,Yaogang Li,Chengyi Hou,Hongzhi Wang
Using body heat as a sustainable energy source through the thermoelectric effect to power wearable electronics is promising. Ionic thermoelectric materials based on the thermogalvanic effect can generate stable voltage under low-temperature differences, but their low thermopower and poor contact interface with electrodes hinder practical use. In this study, strong chaotropic salts are utilized to modify the solvation shells of ions, increasing the thermopower of the p-type redox couple [Fe(CN)₆] 3 ⁻/[Fe(CN)₆]⁴⁻ to 3.98 mV K −1 . Additionally, Arrhenius acid is introduced to inhibit the deprotonation of the n-type redox couple Fe 3 ⁺/Fe 2 ⁺, enhancing the thermopower to −2.29 mV K −1 . Liquid metal electrodes, with excellent deformability and hydrogen bonding with hydrogel surfaces, effectively reduce the resistance of thermocells. Thus, a pair of p-n thermocells achieve a voltage output of 118 mV and a current density of 4.5 A m − 2 , with a maximum power density of 0.11 W m − 2 (Δ T = 5 K). A wearable device integrated with 18 p-n pairs can generate a voltage of 2.2 V from body heat and continuously power portable electronic devices. This work demonstrates the promising potential of wearable self-powered devices for practical daily applications.
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Journal of Energy Storage
·
2024
·
IF 8.9
Hamouda Adam Hamouda,Leila Mahmoud Mokhtar,Badr Ahmed Mahmoud,Inaam A. Salim,Asha Fadalla Wady,Ali Abdellahi Eltayeib,Hui Peng,Guofu Ma,Ziqiang Lei
Herein, the novel Mn-Co-P nano-spheres and acacia wood-derived activated carbon (ACWC) as positive and negative electrodes, respectively, were used to develop an ultra-stable asymmetric supercapacitor. The Mn-Co-P nano sphere was synthesized by a hydrothermal method to give distinct characterization morphology and electrochemical performance. Detail with regard to its physical and chemical properties of the active material coated on the nickel substrate are studied by X-ray diffraction, field-emission scanning electron microscopy, field-emission transmission electron microscopy, high-resolution X-ray photoelectron spectroscopy analyses, thermogravimetric analysis (TGA), and N 2 adsorption-desorption isotherms. The electrochemical properties of the prepared materials were tested in electrolyte by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). Results show that the Mn-Co-P electrode has a high specific capacity of 119.34 mAh g −1 at 0.5 A g −1 current density. The ACWC active carbon was prepared from acacia wood to give a high surface area of 1210 m 2 g −1 , with a high specific capacitance of 225 F g −1 at 0.5 A g −1 . Asymmetric supercapacitor devices based on the electrodes exhibit a high energy density of 36.2 Wh kg −1 at 850.00 W kg −1 . In addition, outstanding cycling number stability of 93.3 % capacitance retention over 10,000 cycles was achieved using sodium sulphate (0.5 M) as an electrolyte.
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CARBON
·
2024
·
IF 10.5
Guangkai Jin,Yuhong Cui,Kaige Yan,Shenghua Xue,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
To address energy wastage caused by friction, it is urgently needed to develop multi-functionalized nano-additives based on traditional lubricant additives. Herein, nitrogen/phosphorus co-doped carbon dots (N,P-CDs) are successfully prepared via one step hydrothermal method using benzopyrrole as raw materials and diethylenetriaminepenta as N, P-dopant. The prepared N,P-CDs demonstrate good lubrication effects when used as water-based additives. Compared with pure H 2 O, the coefficient of friction (COF) significantly decreases from 0.448 to 0.144, accompanied by a notable reduction in wear volume from 3.84 × 10 5 μm 3 to 2.31 × 10 5 μm 3 . This is attributed to the formulation of the robust hydration layer on the CDs surface, as well as the tribochemical protective film generated on the friction pair surface. In addition, the introduction of N,P-CDs effectively inhibits bacterial growth during long-term storage of H 2 O as lubricant. With small additions (100 μg/mL), the anti-bacterial rates against Escherichia coli and Staphylococcus aureus could reach 94.9 % and 99.5 %, respectively.
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Advanced Materials Technologies
·
2024
·
IF 6.4
Yichao Wang,Mengjuan He,Jingli Tang,Liqian Huang,Xueli Wang,Jianyong Yu
Conductive textiles with electromagnetic interference (EMI) shielding functionality are highly desirable for growing flexibility requirements of EMI shielding devices. Most extant shielding coatings on textiles rely on rigid nanomaterials, which are susceptible to detachment, and generate a great deal of reflected EM waves. Thus, there is a high demand for shielding coatings on textiles that are stretchable, stable, and capable of suppressing the secondary reflection toward incident EM waves. Liquid metal is a particularly suitable candidate owing to its high electrical conductivity and excellent conformality. Herein, a straightforward coating strategy is developed for fast fabrication of Ion/Clay-F that is reinforced with ionogel encapsulation. Especially, the method enables the direct transformation of fluid-like liquid metal into a clay-like state and the preparation of ionogel sealings from monomer solutions. The resulting Ion/Clay-F exhibits promising features, including high total EMI shielding effectiveness (SE T ) (highest value of 49.3 dB for a single layer and an average value of 73.0 dB for three layers), low reflectivity (0.404), improved tensile strength (13.16 MPa) and tolerance in a wide range of temperatures (−18–100 °C). Remarkably, such Ion/Clay-F outperforms pure cotton fabric in terms of thermal management, delivering superior heat dissipation and thermal insulation properties.
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CHEMOSPHERE
·
2024
·
IF 8.1
Yan Li,Zongyan Huang,Hui Zhang,Jieyu Zhao,Daolin Du
Plant-microbe remediation technique is considered as a promising technology in removal of organic pollutants and its remediation efficiency is largely affected by a variety of surrounding environmental factors. Humic acid (HA) is the complex organic substance ubiquitous in environment, which characterized by its surfactant-like micelle microstructure and various reaction activity. In our study, a plant-microbe association with high p - tert -Butylphenol (PTBP) degradation potential constructed by Spirodela polyrhiza and Sphingobium phenoxybenzoativorans Tas13 has been used, and the influence of HA on the PTBP degradation efficiency of S. polyrhiza -Tas13 association was investigated. The result showed that the presence of HA greatly improved PTBP removal efficiency of S. polyrhiza -Tas13. The reason accounted for this may be due to the presence of HA promoted bacterial cell propagation, altered bacterial cell wall permeability, increased catechol 2,3-dioxygenase (C23O) enzyme activity of strain Tas13, rather than increasing the colonization ability of strain Tas13 on to the root surface. This study will greatly facilitate the application of aquatic plant-microbe association in environmental remediation.
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