CLAY MINERALS
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2021
·Vol. 56
·期 3
·169-177
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IF 1.478
Xuefen Zhang,Mingxue Xiang,Zhongbang Zhu,Youqin Zou,Ping Zhang
Hierarchical layered double hydroxide (HLDH) was synthesized by using sodium dodecyl sulfate (SDS) as a soft-template agent for the removal of two charged organic dyes (i.e. methylene blue (MB; cationic dye) and methyl orange (MO; anionic dye)). The experimental results based on response surface methodology (RSM) demonstrated distinct removal behaviours of HLDH towards these two dyes: (1) the maximum capacity was 416.7 mg g–1 for MO and 58.7 mg g–1 for MB at 25°C; (2) the increase in temperature could enhance MO removal significantly, whereas it had a negligible effect on the MB treatment process; and (3) rapid removal of MB (5 min) compared to MO (480 min) was observed. In addition, the removal process for both dyes was pH-independent. Multiple characterization techniques further revealed the removal mechanisms, demonstrating that SDS played a significant role in the removal of both dyes; that is, MO replaced SDS to be intercalated into the HLDH interlayer via anion exchange. MB could influence the –SO3 group of SDS, resulting in it modifying the electrodensity of SDS. It could then be further combined with an SDS anion (DS–) via hydrophobic and electrostatic interactions to form DS-MB monolayers. This work not only provides an efficient capture agent for charged dyes, but also offers a deep insight into the underlying removal mechanism.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xuesong Zhao,Yingying You,Yiyang Ma,Chenchen Meng,Zhenghua Zhang
Toxic organic dyes are a serious threat to the global environment, and membranes with catalytic properties show great promise as a green water treatment method for removing these pollutants. Herein, Ti 3 C 2 /W 18 O 49 photocatalytic membranes were constructed by vacuum filtrating Ti 3 C 2 and W 18 O 49 to form a hybrid layer on a mixed cellulose ester (MCE) support. The efficient separation of dyes was attributed to the negative charge and abundant –OH groups of Ti 3 C 2 /W 18 O 49 , which can capture cationic dyes by electrostatic adsorption and form hydrogen bonds with the amino groups of dye molecules. Moreover, the Ti 3 C 2 /W 18 O 49 membrane exhibited excellent photocatalytic performance and a dye-contaminated membrane was regenerated under visible light in 120 min. The two component materials complement each other, with the W 18 O 49 providing adsorption sites and photocatalytic ability and the Ti 3 C 2 serving as an electron trap and improving charge separation. Photoinduced electrons in the conduction band of W 18 O 49 are transferred to Ti 3 C 2 to form O 2 – , while holes remain in the valence band of W 18 O 49 to generate OH, and h + . O 2 – and OH are mainly responsible for the degradation of dyes. Therefore, this efficient and easily prepared membrane shows practical potential as a next-generation method for dye removal from water.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shuangjie Sun,Yameng Wang,Binbin Sun,Feifei Zhang,Qing Xu,Hao-Yang Mi,Heng Li,Xiaoming Tao,Zhanhu Guo,Chuntai Liu,Changyu Shen
Solar steam generation is an efficient way of harvesting solar energy for water purification. Developing a versatile solar absorber with salt resistance and the capability to purify an oil-in-water emulsion is a grand challenge. Herein, a polypropylene (PP) nonwoven fabric-based photothermal absorber is fabricated by the combination of carbon nanotubes (CNTs), polypyrrole (PPy), and a fluorinated hydrophobic coating in a layer-by-layer approach. The specially designed architecture displays a hierarchical microstructure and Janus wetting properties, facilitating solar absorption and heat generation on the evaporation surface, and can effectively prevent salt crystallization. The water layer formed on the superhydrophilic/underwater superoleophobic bottom surface could repel oil droplets and form a channel to advect concentrated salt back into bulk water, which enabled high purity separation of an oil-in-water emulsion and continuous desalinization of seawater without the reduction of the evaporation rate. As a result, the solar absorber can achieve a remarkable evaporation rate of 1.61 kg m–2 h–1 and an energy efficiency of 91.2% under 1 sun irradiation and shows extraordinary performance in the purification of contaminated wastewater (over 99.8% purity). The strategy proposed provides a pathway for developing versatile high-performance solar absorbers for the sustainable treatment of saline water, wastewater, and oil-containing water.
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CHEMOSPHERE
·
2021
·
IF 7.086
Yu Li,Yong Feng,Bin Yang,Zequn Yang,Kaimin Shih
The activation of persulfate by ferrous iron (Fe(II)) is of great interest to the environmental remediation community, but the reduction of ferric iron (Fe(III)) to Fe(II) is slow and the accumulation of iron sludge resulted from the precipitation of Fe(III) is a great concern. Here, molybdenum disulfide (MoS 2 ) was studied as a co-catalyst to improve the activation of peroxymonosulfate (PMS) by Fe(III) for sulfadiazine (SDZ) degradation and different characterization technologies were used to reveal the reactive species. The results showed that a strong synergy existed between MoS 2 and Fe(III); approximately 94.3% of the SDZ was removed by MoS 2 -Fe(III)-PMS after reaction for 30 min, while only 8.5% and 56.4% of the SDZ was removed by Fe(III)-PMS and MoS 2 -PMS, respectively. Both hydroxyl radicals and sulfate radicals were generated and the latter was the primary species. In addition to the radicals, singlet oxygen was found to be generated and contributed to the degradation of SDZ. The chemical probe reaction with methyl phenyl sulfoxide showed that the generation of high-valent iron-oxo species was not obvious by MoS 2 -Fe(III)-PMS under both acidic and neutral conditions. MoS 2 had good stability. No noticeable deactivation was observed during the 1st to 5th run and no obvious oxidation of surface Mo(IV) occurred. Based on the characterization of catalyst and oxidizing species, a mechanism for the activation of PMS by MoS 2 -Fe(III) was proposed. The results from this study are expected to clarify the reactive species and deepen the understanding of MoS 2 -promoted persulfate activation by Fe(II)/Fe(III).
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Nano Research
·
2020
·Vol. 14
·期 3
·646-653
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IF 8.183
Jiao Handong,Jiao Shuqiang,Song Wei-Li,Xiao Xiang,She Dongmei,Li Na,Chen Haosen,Tu Jiguo,Wang Mingyong,Fang Daining
Rechargeable Al-ion batteries (AIBs) are considered as one of the most fascinating energy storage systems due to abundant Al resource and low cost. However, the cycling stability is subjected to critical problems for using Al foil as negative electrode, including Al dendrites, corrosion and pulverization. For addressing these problems, here a lightweight self-supporting N-doped carbon rod array (NCRA) is demonstrated for a long-life negative electrode in AIBs. Experimental analysis and first-principle calculations reveal the storage mechanism involving the induced deposition of N-containing function groups to Al as well as the ideal skeleton of the NCRA matrix for Al plating/stripping, which is favorable for regulating Al nucleation and suppressing dendrites growth. Compared with the Al foil, the NCRA exhibits lower areal mass density (∼ 72% of Al foil), smaller thickness (40% of Al foil), but much longer cycle life (> 4 times of Al foil). Benefiting from the remarkable stability of the array structure, symmetric cells show excellent cycling stability with small voltage hysteresis (∼ 80 mV) and meanwhile there are no corrosion and pulverization problems even after cycled for 120 hours. Besides, full cells also manifest long lifespan (1,500 cycles) and increased Coulombic efficiency (100±1%).
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BIOMACROMOLECULES
·
2021
·
IF 6.988
Shuai Zhu,Ruizhong Xue,Zikun Yu,Xu Zhang,Shifang Luan,Haoyu Tang
Poly(l-cysteine)s with methylthio pendants (PMTLCs) were synthesized by ring-opening polymerization of a new l-cysteine-based N-carboxyanhydride. The thioether bonds of PMTLC can be readily oxidized by H2O2 yielding water-soluble PMTLCOX. The methylthio groups can undergo an alkylation reaction using methyl iodide and a subsequent ion-exchange reaction yielding sulfonium-based polypeptides (PPLC-DMS-X, where X = I, BF4). PPLC-DMS-X showed upper critical solution temperature-type thermo- and oxidation-responsive properties in aqueous solutions. Both PMTLC and PPLC-DMS-X showed oxidation-induced β-sheet to α-helix transitions. The absorbance of PPLC-DMS-I and methyl orange aqueous solution displayed a significant linear correlation with temperature, which makes the sulfonium-based polypeptides good candidates in the field of temperature sensors.
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Journal of the Taiwan Institute of Chemical Engineers
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2021
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IF 5.876
Junli Zheng,Linlin Du,Peng Gao,Kaiwei Chen,LiLi Ma,Yuanli Liu,Shaohong You
The excessive discharge of dye wastewater is a great threat to human health and environment with the development of industry. And it is of great significance to use biomass materials to remove dyes from wastewater with the low cost, renewability and environmental friendliness. In this study, the amine-modified passion fruit peel (ACPFP) was prepared by amination reaction, which exhibited highly efficient removal for anionic dyes (methyl orange (MO) and amaranth (ART)). The adsorption capacities of ACPFP for MO and ART were 1530.81 and 970.87 mg⋅g −1 , respectively. And the adsorption conditions (pH, ionic strength, temperature, initial dye concentration, and contact time) and mechanism (kinetic and isotherm models) were investigated. The results revealed that 99% of MO and ART was removed in the best adsorption conditions: pH=5, an adsorbent dose of 1 g⋅L −1 , 600 mg⋅L −1 of MO and ART initial concentration. The adsorption process correlated well with the pseudo-second-order kinetic model and the Langmuir isotherm. And ACPFP had good adsorption selectivity, stability and recyclability for anionic dyes. In conclusion, ACPFP has broad application prospects in actual water treatment.
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Shuangshuang Lin,Haiming Hua,Jiyang Li,Peng Zhang,Jinbao Zhao
We have found that the formation of passivation film plays a major role in the negative shift of the decomposition voltage in the hydrogen-generating process. Both the hydrolysis of weak acid ions and the decarboxylation reaction of carboxylate can make the LiCO 2 CH 3 produce a passivation film to inhibit the water decomposition to a certain extent. As for the LiCO 2 CF 3 without hydrolysis of weak acid ion, it can be highly possible to facilitate the introduction of CO 2 via its carboxylate specific decarboxylation reaction, and further produce lithium carbonate passivation film as well. However, the water decomposition voltage in the oxygen-producing process is more dependent on the properties of lithium salt anions. Those with strong electron-absorbing groups such as the trifluoromethyl are more likely to effectively endue the aqueous electrolyte with a high oxidative decomposition potential . Moreover, the concentration of LiCO 2 CF 3 aqueous electrolyte can reach up to 28 mol kg −1 , and hence the electrochemical stability window of this water-base electrolyte can be expanded to about 3.0 V. This work provides a new idea for the selection of high concentration lithium salt.
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Nanoscale
·
2020
·Vol. 12
·期 30
·16245-16252
·
IF 6.895
Huiyu Jiang,Junfeng Li,Zhiheng Xiao,Bo Wang,Mingzhao Fan,Siqi Xu,Jun Wan
Transition metal carbides (TMCs) have attracted great interest owing to their potential applications for energy storage and electrocatalysis. But the synthesis of high-quality TMCs usually needs high energy consumption, long reaction times, or dangerous chemical reagents, limiting their practical application. Here, a microwave combustion method is developed to rapidly (∼2 min) produce transition metal carbides under ambient conditions. The as-synthesized TMCs (W2C, VC, Fe3C, NbC, TaC, and Mo2C) and rGO composites exhibit outstanding catalytic performance for the hydrogen evolution reaction (HER) over a broad range of pH values. This work highlights a novel strategy for the design and synthesis of transition metal carbides.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yinli Liu,Jie Jia,Tingting Gao,Xueli Wang,Jianyong Yu,Dequn Wu,Faxue Li
Novel nanofibrous membranes with outstanding adsorption property and high durability were fabricated by chemically immobilizing carboxymethyl-β-cyclodextrin polymers on the surfaces of biodegradable poly((butylene succinate-co-terephthalate)-co-serinol terephthalate) nanofibrous membranes via the amidation reaction. As an ecofriendly adsorbent, the resulting nanofibrous membranes presented rapid adsorption toward methylene blue (MB) dye with a removal efficiency of about 90% within 30 s and had the maximum adsorption capacity of 1030.9 mg/g to it. The thermodynamic parameters indicated that the adsorption process of the adsorbent to MB dye was endothermic and spontaneous. Selective adsorption was another advantage to the adsorbent, which showed preferable adsorption to cationic dye MB rather than anionic dye methyl orange with a separation efficiency of 99.9% to them. Inspiringly, the removal efficiency and mechanical properties of the adsorbent hardly changed after 20 regeneration cycles, indicating its good regeneration and high durability in treating the dye-containing wastewater.
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BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2020
·Vol. 41
·期 5
·552-557
·
IF 0.611
Shan Li,Zhongping Chen,Datong Wu,Yong Qin,Yong Kong
A novel composite of graphene quantum dots functionalized Sb 2 WO 6 (GQDs/Sb 2 WO 6 ) was prepared by an electrostatic self-assembly method and used as a photocatalyst for the degradation of an organic pollutant. The resulting GQDs/Sb 2 WO 6 was characterized by electron microscopy and optical measurements. The photocatalytic activity of GQDs/Sb 2 WO 6 was investigated by degrading methyl orange (MO) under UV-light and visible-light irradiation. Compared with pure Sb 2 WO 6 , enhancement of the photocatalytic performance of GQDs/Sb 2 WO 6 was achieved, and the degradation efficiency for MO was almost 100% within 3 h under UV-light irradiation and 71.4% within 3 h under visible-light irradiation. The photocatalytic degradation mechanism of GQDs/Sb 2 WO 6 was illustrated by free radical and hole scavenging experiments, and the main active species were confirmed to be holes (h + ) and superoxide anion radicals (O 2 · − ). Moreover, the GQDs/Sb 2 WO 6 composites exhibited high recyclability and stability and had potential application for decomposing other organic contaminants in water.
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ACS Applied Materials & Interfaces
·
2019
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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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