CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Yuhao Cai,Bing Tang,Liying Bin,Shaosong Huang,Ping Li,Fenglian Fu
This work prepared a novel adsorbent with multi-layer structure and verified its adsorption mechanism for various ionic dyes. By the methods of cross-linking and surface modification, a multi-layer composite (CTAB-Chitosan@Al 2 O 3 ) was successfully synthesized, which showed an excellent adsorptive performance for various anionic dyes. The results indicated that the outer layer and the core adsorbed Congo Red (CO) and Reactive Blue (RB) well, and the middle layer played a leading role on adsorbing Methyl Orange (MO). The maximum adsorption capacity of CTAB-Chitosan@Al 2 O 3 for MO, CO and RB was 327.87, 1250.00 and 1017.90 mg/g, respectively. The characteristics of the as-synthesized adsorbent were revealed by multi-method, including Fourier Transform Infra-Red spectra, X-ray powder diffraction, X-ray photoelectron spectra, Scanning Electron Microscope, Brunauer-Emmet-Teller surface area and Thermogravimetric analyzer, which verified that the comprehensive effects of electrostatic interaction and hydrogen bond was the main mechanism for CTAB-Chitosan@Al 2 O 3 to adsorb ionic dyes. The pH value obviously influenced the surface charge of CTAB-Chitosan@Al 2 O 3 , and it was a convenient approach to regulate and control the adsorption process by only adjusting the pH value.
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高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Yang Wang,Zheng Zhang,Ting Li,Piming Ma,Hongji Zhang,Mingqing Chen,Mingliang Du,Weifu Dong
In this work, photothermal-responsive graphene oxide (GO)-based membranes intercalated by multiwalled carbon nanotubes (MWCNTs) were prepared by polydopamine (PDA) modification and 2-ureido-4[1H]-pyrimidinone (UPy) assembly process. Benefited from the high photothermal conversion ability of PDA and reversible UPy dimer, the permeation flux of the GO-based membrane can be easily modulated with a high gating ratio under near-infrared light switched off and on. Nanochannels created by the intercalation of MWCNTs into GO layers greatly increase water permeation without sacrificing the rejection of dye molecules in water (96.2% for methyl orange, 98.9% for rhodamine B, and 99.7% for Coomassie brilliant blue). The composite membranes also exhibit trade-off between rejection of heavy metal ions (Cu2+ and Fe3+). Moreover, such GO-based membranes show high pH stabilities, which show great potential in the water purification applications.
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高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 7
·期 1
·1901535
·
IF 4.713
Guoke Zhao,Hongwei Zhu
To extend the effective working range of porous membranes is highly desirable for membrane applications. Here, graphene oxide (GO) based membranes capable of retaining stable retention properties with varying pH are reported. The self-adjustable properties of GO based membranes are realized by coupling with pH-responsive polyacrylic acid (PAA) molecules via a facile vacuum filtration process. With decreasing pH, the shrinkage of the molecular chains of PAA decreases the interlayer spacing of PAA/GO membranes, which compensates for the weakened Donnan effect in acidic conditions, leading to the stable retention properties of the membranes over a wide pH range. With PAA introduced, the laminated structure of the membranes is well preserved while the membrane thickness is slightly increased. PAA endows the membranes with obvious self-alteration of pore structure in response to the change of pH. Nanofiltration performance measurements show that the dye retention properties of GO membranes decrease sharply when the pH changes from 9 to 1. However, the rejection rates of PAA/GO membranes could be well retained or even increased in acidic conditions. This work demonstrates that PAA is an effective pH-sensitive modification material for fabricating GO-based membranes with stable retention properties under varying pH.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Handong Jiao,Shuqiang Jiao,Shijie Li,Wei-Li Song,Haosen Chen,Jiguo Tu,Mingyong Wang,Donghua Tian,Daining Fang
Although rechargeable Al batteries attract interests due to their features of abundant Al source and high safety, the Al negative electrodes suffer from critical problems, including dendrite, corrosion, pulverization, non-recyclable Al wastes, etc. For addressing these challenges, here a novel liquid gallium is demonstrated for negative electrodes of Al batteries. The results show that the liquid gallium negative electrode enables the reversible alloying/dealloying between Al and Ga. Remarkably, the essential problems in the solid Al negative electrodes, including dendrite, corrosion and pulverization, would be well avoided attributed to the liquid state of the Ga electrode during cycling. In addition to the enhanced stable cycling performance, Ga negative electrode is also recyclable, allowing the cycled Ga for further presenting stable cycling in the re-assembled batteries, and which is helpful for its practical application. The results in the present work open a precedent way to develop the advanced negative electrode with dendrite-free, corrosion resistant and recyclable features and advantages for various types of rechargeable batteries.
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高影响因子
ENVIRONMENT INTERNATIONAL
·
2019
·
IF 7.943
Chao He,Hengliang Lin,Leilei Dai,Rongliang Qiu,Yetao Tang,Yunpu Wang,Pei-Gao Duan,Yong Sik Ok
Shrimp processing and consumption generate large amounts of waste shrimp shell (WSS) rich in chitin and protein. Herein, we successfully synthesized WSS-based hydrochar (WSH) adsorbent through deproteinization and deacetylation followed by hydrothermal carbonization (HTC) and acid washing. For comparison, another hydrochar (CCH) adsorbent was synthesized from HTC of commercial chitosan under identical conditions. Specifically, WSH contained rich nitrogen-containing functional groups with a long aliphatic chains structure. Acid etching of calcium carbonate in WSS led to a higher specific surface area of WSH (12.65 m 2 /g) which was nearly 6 times higher than that of CCH (2.13 m 2 /g). The lower deacetylation degree of WSH was responsible for higher amide I and amino groups retained therein. Under an optimal initial solution pH of 4.0, WSH could rapidly achieve a superb adsorption capacity of 755.08 mg/g for methyl orange molecule. Moreover, the adsorption process followed a pseudo-second-order kinetics model and was well described by a monolayer adsorption pattern based on the Langmuir isotherm model with correlation coefficients higher than 0.9989. Prominent adsorption performance of WSH for methyl orange was mainly attributed to electrostatic interactions, while steric hindrance effect had a detrimental impact on the adsorption capacity of CCH. Superb adsorption capacity and excellent regeneration performance suggest WSH could be a promising and affordable adsorbent candidate for anionic dye removal.
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PubMed
高影响因子
Materials
·
2019
·Vol. 12
·期 3
·336
·
IF 2.972
Xiaogang Guo,Taotao Liang
This work presents a hydrothermal synthesis approach to produce novel schistose molybdenum trioxide (MoO3) powders with wide application, and introduces a facile electrophoresis assembly technique to construct the superhydrophobic MoO3films (SMFs) with contact angle up to 169 ± 1° at normal pressure and temperature. The microstructures and chemical compositions of product were analyzed by field emission scanning electron microcopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD). The wettability and stability studies indicate that the SMFs all show great resistance in various environments with adjusting factors, including droplets with different surface tension, pH, relative humidity, etc., and the stability can be maintained at least for five months. Notably, this paper will provides a valuable reference for designing novel oxide powders and their high-efficient hydrophobic film formation with self-cleaning or water proof properties.Keywords:Schistose molybdenum trioxide;Hydrothermal synthesis;Electrophoretic deposition;high-efficient;superhydrophobic stability
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Qiuying Yi,Jiahui Ji,Bin Shen,Chencheng Dong,Jun Liu,Jinlong Zhang,Mingyang Xing
As an important reactive oxygen species (ROS) with selective oxidation, singlet oxygen (1O2) has wide application prospects in biology and the environment. However, the mechanism of 1O2 formation, especially the conversion of superoxide radicals (·O2–) to 1O2, has been a great controversy. This process is often disturbed by hydroxyl radicals (·OH). Here, we develop a molybdenum cocatalytic Fenton system, which can realize the transformation from ·O2– to 1O2 on the premise of minimizing ·OH. The Mo0 exposed on the surface of molybdenum powder can significantly improve the Fe3+/Fe2+ cycling efficiency and weaken the production of ·OH, leading to the generation of ·O2–. Meanwhile, the exposed Mo6+ can realize the transformation of ·O2– to 1O2. The molybdenum cocatalytic effect makes the conventional Fenton reaction have high oxidation activity for the remediation of organic pollutants and prompts the inactivation of Staphylococcus aureus, as well as the adsorption and reduction of heavy metal ions (Cu2+, Ni2+, and Cr6+). Compared with iron powder, molybdenum powder is more likely to promote the conversion from Fe3+ to Fe2+ during the Fenton reaction, resulting in a higher Fe2+/Fe3+ ratio and better activity regarding the remediation of organics. Our findings clarify the transformation mechanism from ·O2– to 1O2 during the Fenton-like reaction and provide a promising REDOX Fenton-like system for water treatment.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 25
·10141-10150
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IF 3.069
Bin Zhao,Baogang Wang,Hongsheng Lu,Shanshan Dai,Zhiyu Huang
Ionic liquid modified CDs and novel thin nanosheets constructed graphitic carbon nitride (g-C3N4) microspheres were synthesized by the template method and by calcination of a supramolecular precursor, respectively. The CDs were decorated onto the surface of g-C3N4 by solvothermal treatment to tune the visible-light photocatalytic degradation performance of g-C3N4. The CDs could not only form heterojunctions with g-C3N4 by chemical bonding, π–π stacking and electronic attraction interactions, but also change the surface charges of g-C3N4 from negative to positive. The roles played by heterojunctions and surface charges in the photocatalytic performance of CDs (1.6 wt%)/g-C3N4 composites were explored by photocatalytic degradation of anionic (methyl orange, MO), nonionic (p-nitrophenol, p-NP) and cationic (methylene blue/rhodamine B, MB/RhB) pollutants. Compared with g-C3N4, the composite showed obviously higher and lower photocatalytic activity for MO/p-NP and MB/RhB degradation, respectively. These results demonstrated that the surface charges might play a positive or negative but dominant role by enhancing or inhibiting the absorption of pollutant molecules despite the fact that heterojunctions always played a positive role by promoting the light-harvesting ability and separation efficiency of photo-generated electron–hole pairs of g-C3N4.
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JOURNAL OF POROUS MATERIALS
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2019
·Vol. 26
·期 6
·1861-1867
·
IF 1.947
Zhang Qian,Jing Ruisen,Zhao Shifeng,Wu Mi,Liu Xijuan,Shao Yifei,Lv Fengzhu,Liu Aiju,Meng Zilin
Montmorillonite was employed as adsorbent to remove cationic and anionic dyes respectively and simultaneously. When the dye present singly, it only had a good effect to cationic dye removal. The experimental data well fitted to pseudo-second-order kinetic model, and the adsorption behavior followed the Langmuir model revealed that cationic dye adsorption was a monolayer coverage and charge-limited adsorption process. Molecular arrangement of the contaminants in the interlayer were analyzed by molecular simulation. As the cationic and anionic dyes co-exist, both cationic and anionic dyes could be removed. The adsorption mechanism of anionic dyes, under the circumstances, were investigated through equilibrium experiment, XRD and molecular dynamics simulation. The experimental data showed that anionic dyes in mixed wastewater were fitted Freundlich model well and the mechanism of anionic dyes removal was trapped by hydrophobic interaction on account of organic phase formed by cationic dyes in the interlayer.
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高影响因子
Polymers
·
2019
·Vol. 11
·期 8
·1293
·
IF 3.164
Xuejuan Shi,Xiaoxiao Zhang,Liang Ma,Chunhui Xiang,Lili Li
Chitosan/cellulose acetate (CS/CA) used as a biopolymer systema, with the addition of TiO2as photocatalyst (C-T/CA) were fabricated by alternating electrospinning/electrospraying technology. The uniform dispersion of TiO2and its recovery after the removal of methyl orange (MO) was achieved by incorporating TiO2in CS electrosprayed hemispheres. The effects of pH values, contact time, and the amount of TiO2on adsorption and photocatalytic degradation for MO of the C-T/CA were investigated in detail. When TiO2content was 3 wt %, the highest MO removal amount for fiber membranes (C-T-3/CA) reached 98% at pH value 4 and MO concentration of 40 mg/L. According to the data analysis, the pseudo-second-order kinetic and Freundlich isotherm model were well fitted to kinetic and equilibrium data of MO removal. Especially for C-T-3/CA, the fiber membrane exhibited multiple layers of adsorption. All these results indicated that adsorption caused by electrostatic interaction and photocatalytic degradation were involved in the MO removal process. This work provides a potential method for developing a novel photocatalyst with excellent catalytic activity, adsorbing capability and recycling use.Keywords:TiO2;chitosan;electrospinning;electrospraying;methyl orange;photocatalytic degradation
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Qingjie Wang,Yan Cui,Rongjiao Huang,Laifu Zhong,Peng Yan,Shilin Zhang,Qihang Zhao,Denghui Jiang,Aidong Tang,Huaming Yang
Completely decomposing low concentrations of organic pollutants in neutral wastewater under sunlight irradiation poses an important challenge for water treatment systems. A combination of photocatalysis and Fenton techniques is expected to solve this problem. Herein, a novel heterogeneous Fenton reaction system with good photocatalytic performance was developed by activating peroxymonosulfate (PMS) via nitrogen-doped TiO 2 (N-TiO 2 ) and acid-activated sepiolite (ASep) nanocomposites (N-TiO 2 /ASep). The N-TiO 2 /ASep nanocomposites were prepared by anchoring the N-TiO 2 onto ASep. The electronic structure of the Ti 3+ self-doped N-doped TiO 2 was regulated by calcining N-TiO 2 /ASep nanocomposites under different atmospheres. Methyl orange degradation, influencing factors, and reaction mechanisms under visible light irradiation were investigated in detail. The results indicated that, under visible light irradiation, N-TiO 2 /ASep alone had almost no photocatalytic activity, and PMS alone exhibited only 20% photocatalytic activity. However, the N-TiO 2 /ASep(N 2 )/PMS system degraded about 95% of the methyl orange within 60 min. By contrast, the reaction rate constant of N-TiO 2 /ASep(N 2 )/PMS was nearly 5.44 times higher than that of TiO 2 /PMS . This excellent performance was attributed to the synergy among N-TiO 2 , ASep, and PMS. Moreover, the calculated carrier density and photocurrent density of N-TiO 2 /ASep (N 2 ) was nearly 3.75 and 2.80 times that of N-TiO 2 /ASep (Air), suggesting that N-TiO 2 /ASep(N 2 ) had a greater carrier separation efficiency because more Ti 3+ species were provided. Furthermore, radical scavenger experiments and electron spin resonance testing demonstrated that h + , O 2 − , SO 4 − and OH were the important radicals. More importantly, photocatalytic performance was optimal at pH 7 in the presence of various ions. The results of this study expanded the applications of PMS and advanced oxidation processes. This work provides the necessary scientific basis for further studies of organic pollutant remediation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Yi Ren,Kaibin Tang,Wenqi Zhan,JingJing Luo,Miao Wang
As a typical noble nanomaterial , silver (Ag) nanoparticles have been widely used as a catalyst, but their performance is somewhat limited by self-aggregation. In this study, H 2 SrTa 2 O 7 nanosheet-supported ultrafine Ag nanoparticles (Ag/H 2 SrTa 2 O 7 ) were successfully synthesized, and the aggregation of Ag nanoparticles was effectively prevented. The Ag/H 2 SrTa 2 O 7 catalyst exhibited excellent activity in p -nitrophenol reduction and was successfully recycled 10 times without a substantial decrease in its catalytic activity. This superior catalytic activity could be ascribed to the large surface area of H 2 SrTa 2 O 7 nanosheets and the effective dispersion of Ag nanoparticles on the perovskite nanosheets. This work is important for the simple and green preparation of Ag catalysts with excellent catalytic performance on nontoxic perovskite nanosheets.
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