ENVIRONMENTAL RESEARCH
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2022
·
IF 8.431
Wenbin Hu,Ziwen Chang,Aiping Tang,Yun Wei,Difan Fang,Xiang Lu,Penghui Shao,Hui Shi,Kai Yu,Xubiao Luo,Liming Yang
Supported-adsorbents growing on the substrate in situ are equipped with the advantages of high adsorption capacity, excellent regeneration performance, and adaptability to complex wastewater. However, the effects of substrate on the adsorption properties of supported-adsorbent are rarely considered, which will hinder its development and scale-up applications. In this study, the influences of different substrates (Ti, Mo, W, CC) on the Ag + adsorption behavior of supported-MoS 2 adsorbents were investigated. The adsorption kinetics , adsorption mechanism, and the renewability of these supported-MoS 2 were compared orderly. As a result, MoS 2 grown on a tungsten substrate (MoS 2 –W) exhibits a remarkable adsorption capacity for Ag + (1.98 mg cm −2 and 598.80 mg g −1 ), which is 6.38–33 times more than the other three supported-MoS 2 . Moreover, the MoS 2 –W also possesses an ultrahigh distribution coefficient (24.80 mL cm −2 ) for Ag + , and the selection coefficient can reach 1984. XRD and electrochemical characterization analysis indicated that Ag + adsorption performance of supported-MoS 2 is positively correlated with the degree of its amorphous structure. Substrate W with the terrific electrical properties which may facilitate the disordered growth of MoS 2 , resulting in more active sites exposed, and endow MoS 2 –W with outstanding Ag + capture performance. Finally, the supported-MoS 2 retains a high removal efficiency of Ag + after 5 cycles of adsorption and desorption. This study provides a novel perspective for promoting the practical application of supported-sorbents to recycle heavy metals.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2020
·Vol. 37
·期 6
·2000106
·
IF 3.099
Nannan Li,Hao Wang,Yunhe Lai,Huanjun Chen,Jianfang Wang
Dielectric nanoparticles are expected to complement or even replace plasmonic nanoparticles in many optical and optoelectronic applications, because they exhibit small absorption losses and support strong electric and magnetic resonances simultaneously. Dielectric nanoparticles need to be deposited on various substrates in many applications. Understanding the substrate effect on the electromagnetic resonances of dielectric nanoparticles is of great importance for engineering their resonance properties and designing optical devices. In this study, moderate-refractive-index cuprous oxide nanospheres with uniform sizes and shapes are synthesized. The scattering spectra and images of the nanospheres deposited on three types of substrates are analyzed experimentally and theoretically. When supported on indium tin oxide–coated glass slides and Si wafers, the color of the nanospheres varies from blue, cyan, green, yellow, orange and red, covering almost the entire visible region. When deposited on gold films, the electromagnetic resonances of the nanospheres redshift intensively and a new effective magnetic resonance mode appears. The enhanced Raman scattering reveals that large electromagnetic field enhancements are produced in the gap region between the nanosphere and the substrate. The results shed light on the manipulation of the electromagnetic responses of dielectric nanoparticles and the design of dielectric metamaterials in the presence of various substrates.
研究领域:
光学
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材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 24
·4655
·
IF 5
Jianquan Xu,Xiaojin Guo,Hongkai Guo,Yizhi Zhang,Xinping Wang
The polymer/substrate interface plays a significant role in the dynamics of nanoconfined polymers because of its suppression on polymer mobility and its long-range propagation feature, while the molecular origin of the long-range substrate effect in unentangled polymer material is still ambiguous. Herein, we investigated the propagation distances of the substrate effect (h*) by a fluorinated tracer-labeled method of two unentangled polymer films supported on silicon substrates: linear and ring poly(methyl methacrylate) films with relatively low molecular weights. The results indicate that the value ofh* has a molecular weight dependence ofh*∝N(Nis the degree of polymerization) in the unentangled polymer films, whileh*∝N1/2was presented as previously reported in the entangled films. A theoretical model, depending on the polymer/polymer intermolecular interaction, was proposed to describe the above long-range propagation behavior of the substrate effect and agrees with our experiment results very well. From the model, it revealed that the intermolecular friction determines the long-range propagation of the substrate effect in the unentangled system, but the intermolecular entanglement is the dominant role in entangled system. These results give us a deeper understanding of the long-range substrate effect.Keywords:polymer/substrate interface;long-range substrate effect;unentangled polymer system;poly(methyl methacrylate) film
研究领域:
高分子科学
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材料科学
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表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Pengyan Wang,Chengmei Ding,Zubing Huang,Jiwei Lv,Meiyan Li,Shiwei Zhang,Xupo Liu,Shichun Mu
For a single-substance catalyst, due to the different adsorption/desorption kinetics of metallic (cationic) and nonmetallic (anionic) sites, it typically catalyzes hydrogen evolution in a single-active-site manner, which greatly limits the activity of catalysts. Thus, herein, we simultaneously activate the anion (P) and cation (Ni) sites in nickel phosphide (Ni2P) and generate highly active P(Ni) dual sites through the substrate effect of NiS2–NiS heterogeneous structures. Theoretical calculation results combined with in situ Raman spectroscopy unveil that the NiS2–NiS substrate effectively regulates the charge distribution to concentrate around the P atom, therefore resulting in Ni and P synergistic dual active sites for water adsorption, water dissociation, and H* adsorption. Accordingly, the dual active site formed enables the Ni2P/NiS2–NiS electrocatalyst to only require an overpotential of 75 mV to achieve a current density of 10 mA cm–2 in alkaline media, very close to the Pt-group noble metal catalyst. This work highlights the critical regulatory role of substrates in activating the anion–cation dual active site in the single metal/intermetallic compound (such as metal phosphides, sulfides, nitrides, carbides, borides, and silicides) that promotes catalytic performance.
研究领域:
材料化学
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电催化
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能源科学
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纳米材料
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物理化学
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表面科学
✓ 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）