SEPARATION AND PURIFICATION TECHNOLOGY
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2019
·
IF 5.107
Sharafat Ali,Izaz Ali Shah,Haiou Huang
The need for high-performance and novel technologies for selective treatment of radionuclides in water has recently stimulated broad research. In this study, we examined the ability of carbon nanotube (CNT) membranes in selective removal of strontium (Sr 2+ ) and cesium (Cs + ) from water and wastewater. In single-metal systems that contained only Sr 2+ , Cs + or their competitive metal ions, the distribution coefficients ( K d ) of functionalized CNT membranes for divalent cations, i.e., Sr 2+ , Ca 2+ , and Mg 2+ , were measured as 4.41 mmol g −1 , 2.14 mmol g −1 , and 1.30 mmol g −1 , respectively, and those for monovalent cations, i.e., Cs + , K + and Na + , were 0.81 mmol g −1 , 0.79 mmol g −1 , and 0.81 mmol g −1 , respectively. When Cs + or Sr 2+ co-existed with a competing cation, both pristine and functionalized CNT membranes showed excellent selectivity to Sr 2+ over Mg 2+ and Ca 2+ while their selectivity to Cs + over K + and Na + diminished. Moreover, the CNT membranes remained their selectivity for Sr 2+ in a wastewater effluent despite the complex water composition. Overall, the selectivity sequence of the CNT membranes for divalent cations support the occurrence of inner-sphere complexation on CNT surfaces, while that for the monovalent cations was probably determined by electrostatic interactions. This study demonstrates that Ar/O 2 plasma treatment is a greener technology for the production of CNT functionalized membranes for selective removal of contaminants from water to achieve “fit-for-purpose” treatment.
研究领域:
环境科学
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材料科学
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水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 1
·82
·
IF 4.146
Chuang Li,Dan Wang,Jiangli Gu,Yichun Liu,Xintong Zhang
Surface electron traps on semiconductor photoanodes mediate surface recombination and deteriorate the photoelectrochemical (PEC) water oxidation performance of the photoanode. Developing convenient methods to reduce surface electron traps is therefore essential for high efficiency PEC water oxidation on semiconductor photoanodes, particularly for nanostructured photoanodes with large surface area. Herein, we employ a O2plasma treatment to boost the PEC water oxidation performance of Ti-doped Fe2O3(Ti-Fe2O3) nanowires photoanodes, aiming to reduce surface oxygen vacancies, the dominant electron traps on Ti-Fe2O3surface. X-ray diffraction (XRD), scanning electron microscopy and spectroscopic analyses show that the oxygen plasma treatment changes the structural, morphological and optical properties negligibly, but it does reduce the content of surface oxygen vacancies, as estimated from O1s X-ray photoelectron spectroscopy spectra. An optimal O2plasma treatment (200 W, 70 s) increases the photocurrent density of the Ti-Fe2O3nanowire photoanode to 2.14 mA·cm−2(1.23 V vs. RHE) under air mass 1.5G simulated solar light, which is 1.95 times higher than the pristine Ti-Fe2O3nanowire photoanode. The surface hole transfer efficiency is also improved by 1.66 times due to the reduced surface recombination. The work suggests that O2plasma treatment is a convenient but effective method to boost the PEC water oxidation performance of Ti-Fe2O3photoanode and might be applicable to other semiconducting oxide photoanodes for high efficiency PEC water splitting.Keywords:photoelectrochemical water splitting;O2plasma treatment;surface oxygen vacancies;Ti-doped hematite nanowire arrays
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 28
·285701
·
IF 3.953
Lei Guo,Huifang Li,Dandan Liu,Yurong Zhou,Lizhong Dong,Siqi Zhu,Yulong Wu,Zhenzhong Yong,Lixing Kang,Hehua Jin,Qingwen Li
Carbon nanotube (CNT)/copper (Cu) composite fibers are placed great expectations as the next generation of light-weight, conductive wires. However, the electrical and mechanical performances still need to be enhanced. Herein, we demonstrate a strategy that is electrodeposition Cu on thiolated CNT fibers to solve the grand challenge which is enhancing the performance of CNT/Cu composite fibers. Thiol groups are introduced to the surface of the CNT fibers through a controllable O2 plasma carboxylation process and amide reaction. Compared with CNT/Cu composite fibers, there are 82.7% and 29.6% improvements in electrical conductivity and tensile strength of interface thiol-modification composite fibers. The enhancement mechanism is also explored that thiolated CNT fibers could make strong interactions between Cu and CNT, enhancing the electrical and mechanical performance of CNT/Cu composites. This work proposes a convenient, heat-treatment-free strategy for high-performance CNT/Cu composite fibers, which can be manufactured for large-scale production and applied to next-generation conductive wires.
研究领域:
材料科学
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纳米技术
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复合材料
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电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PLANT GROWTH REGULATION
·
2022
·Vol. 42
·期 3
·2006-2022
·
IF 4.64
Wang Junhong,Cheng Jun-Hu,Sun Da-Wen
Previous studies have shown the great potential of using plasma-activated water (PAW) on improving agriculture seed germination, however, information on the influence of PAW on crop plantlet juice remains scanty. In this research, the effect of PAW generated by atmosphere pressure Ar–O 2 plasma jet for 1–5 min on wheat seed germination, seedling growth and nutritional properties of wheat plantlet juice was investigated. Results revealed that all PAWs could enhance wheat seed germination and seedling growth in 7 days by improving the germination rate, germination index, fresh weight, dry weight and vigour index, and especially that PAW activated for 3 min (PAW-3) showed the best overall performance. In addition, the application of PAWs enhanced the nutritional properties of wheat plantlet juice from those grown for 14 days by improving total soluble solids, protein content, photosynthetic pigments, total phenolic content, antioxidant activity, enzyme activity, free amino acids and minerals content, and the best enhancement was also observed in PAW-3. It was concluded that PAWs would be an effective technique to enhance the growth and nutritional properties of crop sprouts, which could be served as functional foods in many forms.
研究领域:
农业科学
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植物生理学
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食品科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 10
·4424-4431
·
IF 9.931
Liming Qin,Ning Chen,Xin Zhou,Qinmin Pan
Self-healing is an effective strategy to improve the durability of a superhydrophobic surface, but a challenge remains in repairing its multi-scale structures and wettability simultaneously after damage. Here we report a self-healable superhydrophobic aerogel that spontaneously restores its superhydrophobicity, microstructure and macroscopic configuration simultaneously after physical or chemical damage. The superhydrophobic aerogel is fabricated by decorating an alginate-based aerogel with silver nanoparticles and octadecylamine (ODA). Once the aerogel is scratched or cut, it repairs both hierarchical structures and configuration integrity autonomously via wetting/heating processes, resulting in the recovery of superhydrophobicity and mechanical properties. Even after being etched with O2 plasma, it regains its superhydrophobic properties through a simple heat treatment. The robust healability is attributed to the dynamic catechol–Fe coordination as well as thermally induced rearrangement of ODA molecules. This concept of robust healability offers a new insight into the design of robust superhydrophobic surfaces aiming at various technological applications.
研究领域:
材料科学
·
表面化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zinan Huang,Liuqing He,Wenbiao Zhang,Wenjie Huang,Qijie Mo,Lichun Yang,Qiang Fu,Qingsheng Gao
Bi-functional electrocatalysts are desired for both hydrogen and oxygen evolution reactions (HER and OER). Herein, facile O 2 -plasma activation is introduced to improve the bi-functionality via constructing nickel sulfide-oxide heterostructures . Ni 3 S 2 -NiO x supported by nickel foam delivers obviously elevated HER and OER activity in comparison with pristine Ni 3 S 2 and recently reported NiS x -based electrocatalysts , featured by the low overpotentials for HER (104 mV) and OER (241 mV) at ±10 mA cm −2 in 1.0 M KOH, as well as a voltage of 1.52 V for overall water splitting. As revealed by in-situ Raman spectroscopy , on the one hand, Ni(OH) 2 generated from Ni 3 S 2 during alkaline HER accelerates water dissociation toward the gradually improved performance; on the other hand, this heterostructure undergoes extensive oxidation during OER, leading to excessive NiOOH covering on Ni 3 S 2 and thereby declining activity. These changes are interpreted by the distinct thermodynamic relationship under specific electrochemical conditions via density functional theory calculations.
研究领域:
电化学
·
材料科学
·
催化
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2021
·
IF 6.057
Xiaoqi Zhu,Lingli Xuan,Jiawei Gong,Junjie Liu,Xiaobo Wang,Fengna Xi,Jie Chen
Direct, rapid and sensitive detection of physiologically-relevant active small molecules (ASMs) in complex biological samples is highly desirable. Herein, we present an electrochemical sensing platform by combining three-dimensional macroscopic graphene (3DG) and vertically-ordered mesoporous silica-nanochannel film (VMSF), which is able to directly detect ASMs in complex samples with high sensitivity and no need of tedious pretreatment. Free-standing and macroscopic 3DG serves as the supporting electrode and O 2 -plasma treatment is proposed as a simple and green approach to improve its hydrophilicity and electrochemical activity. The plasma-treated 3DG (pl-3DG) is suitable for stable modification of VMSF using electrochemically assisted self-assembly (EASA) method, conferring the electrode (VMSF/pl-3DG) with excellent anti-fouling properties. As the proof-of-concept demonstration, VMSF/pl-3DG sensor exhibits fast and ultrasensitive determination of uric acid (UA) with ultralow limit of detection (LOD, 23 nM) owing to high active surface, unhindered mass transfer, good electrical transfer of 3DG and signal amplification of VMSF nanochannel . Direct determination of UA in biological sample (serum) is also realized without the need of tedious pretreatment.
研究领域:
材料科学
·
分析化学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）