RSC Advances
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2020
·Vol. 10
·期 13
·7619-7627
·
IF 3.119
Chunmei Xiao,Jianming Lin
The existence of Pb(II) ions in water systems poses significant potential hazards to public health and the environment. In the present study, poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) brush-modified Ni3Si2O5(OH)4 nanotubes were prepared, and their adsorption efficiency against the Pb(II) ions was investigated. The characterization results of FTIR spectroscopy, TGA, TEM, and XPS indicated the successful grafting of PAMPS on the surface of free Ni3Si2O5(OH)4 NTs, and the prepared PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited a 6–8 nm grafting layer, which could provide abundant binding sites for metal adsorption. During the Pb(II) removal process, a pH-dependent adsorption behavior was observed, and the adsorption processes fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm model. Compared with unmodified Ni3Si2O5(OH)4, the PAMPS-g-Ni3Si2O5(OH)4 NTs exhibited obviously faster adsorption of Pb(II) and higher equilibrium adsorption capacity for the removal of Pb(II). The maximum adsorption capacity calculated via the Langmuir isotherm model was 0.653 mmol g−1 (135.3 mg g−1) at 298 K. In a metal coexisting system, the total adsorption capacity of the NTs was increased; this indicated the potential of the proposed NTs in the removal of Pb(II) from metal coexisting wastewater. This study showed the significant potential of PAMPS-g-Ni3Si2O5(OH)4 NTs in the effective removal of Pb(II).
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2020
·
IF 2.87
Chunmei Xiao,Jianming Lin
The contamination of water systems by heavy metals greatly threatens human health and ecological safety. An efficient adsorbent is critical for the removal of these contaminants. In this work, magnetic Ni3Si2O5(OH)4 nanotubes (NTs) have been synthesized via in situ hydrothermal reduction and further functionalized by grafting poly(4-vinyl pyridine) (P4VP) brushes on its surface via atom transfer radical polymerization. Characterizations by Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy proved that P4VP was successfully grafted on the surface of magnetic Ni3Si2O5(OH)4 NTs. The resultant Ni3Si2O5(OH)4-g-P4VP NTs are efficient nanosorbents for removing Cr(VI) anions from water. The Cr(VI) adsorption capacity of Ni3Si2O5(OH)4-g-P4VP NTs reaches 1.49 mmol/g at a pH of 3. The pseudo-second-order kinetic model and the Freundlich isothermal model are suitable to describe the adsorption process. The analysis using Weber–Morris and Boyd models indicates that both intraparticle diffusion and external film diffusion affect the Cr(VI) adsorption process. The adsorption enthalpy is estimated to be 18.37 kJ/mol. More than 90% of the Cr(VI) adsorption capacity of the Ni3Si2O5(OH)4-g-P4VP NTs remains after eight adsorption and desorption cycles.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2024
·Vol. 14
·期 3
·183
·
IF 3.8
Jiarong Ma,Run Zhou,Yu Tu,Ruixin Ma,Daimei Chen,Hao Ding
Ni3Si2O5(OH)4rods (NS) were synthesized via a hydrothermal method, employing natural wollastonite as a template. The hierarchical Ni3Si2O5(OH)4rods exhibited vertically oriented nanosheets, resulting in a substantial increase in the specific surface area (from 2.24 m2/g to 178.4 m2/g). Subsequently, a CdS/Ni3Si2O5(OH)4composite photocatalyst (CdS/NS) was prepared using a chemical deposition method. CdS was uniformly loaded onto the surface of the Ni3Si2O5(OH)4nanosheets, successfully forming a heterojunction with Ni3Si2O5(OH)4. The CdS/NS photocatalyst in the presence of lactic acid as a sacrificial agent demonstrated an impressive H2production rate of 4.05 mmol h−1g−1, around 40 times higher than pure CdS. The photocorrosion of CdS was effectively solved after loading. After four cycles, the performance of CdS/NS remained stable, showing the potential for sustainable applications. After photoexcitation, electrons moved from Ni3Si2O5(OH)4to the valence band of CdS, where they interacted with the holes via an enhanced interface contact. Simultaneously, electrons in CdS transitioned to its conduction band, facilitating hydrogenation. The enhanced performance was attributed to the improved CdS dispersion by Ni3Si2O5(OH)4loading and efficient photogenerated carrier separation through the heterojunction formation. This work provides new perspectives for broadening the applications of mineral materials and developing heterojunction photocatalysts with good dispersibility and recyclability.
研究领域:
材料科学
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纳米技术
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催化
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能源材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
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IF 2.76
Yu Zheng,Ping Zhang,Hairong Yue,Gang Xiang,Zexin Qian,Hongtai Li,Wei Jiang,Bin Liang,Simo O. Pehkonen,Shaojun Yuan
Ni 3 Si 2 O 5 (OH) 4 nanotubes (NTs) are synthesized by a facile one-pot hydrothermal reaction, and further functionalized by grafting of poly(methacrylic acid) (PMAA) brushes via distillation-precipitation polymerization. The resultant PMAA-grafted NTs are used as a novel nanosorbent to uptake copper(II) ions. Success in each functionalization step is ascertained by the characterization of TEM, FTIR, XPS, SEM and TGA. Batch adsorption results indicate that the adsorption of the pristine and PMAA-grafted silicate NTs is fairly fast and the equilibrium is established within 20 min, and the kinetics follow the pseudo-second-order mechanism, evidencing chemisorption as the rate-limiting step. The best interpretation for the equilibrium data is given by Langmuir isotherm, and the maximum adsorption capacity is 2.13 mmol g −1 (136 mg g −1 ) at pH 5 and 25 °C. The successive adsorption-desorption studies reveal that the PMAA-grafted silicate NTs are readily regenerated, and keep their adsorption and desorption efficiencies constant over five cycles. The Ni 3 Si 2 O 5 (OH) 4 - g -PMAA NTs could be directly reduced via hydrothermal reaction to achieve magnetic property for easy separation. With the inherent advantages of pH-sensitivity of PMAA, large surface area and magnetic properties of Ni 3 Si 2 O 5 (OH) 4 NTs, the PMAA-grafted silicate NTs offer a promising and highly efficient nanocomposite sorbent to remove heavy metal ions from aqueous solution.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 23
·5255
·
IF 4.967
Xiaohong Yi,Jingshu Huang,Yizhang Tong,Hui Zhao,Xianwu Cao,Wei Wu
Biodegradable polylactide (PLA) has been widely utilized in people’s daily lives. In order to improve the fire safety of PLA, ammonium polyphosphate (APP) was self-assembled onto the surface of serpentine Ni3Si2O5(OH)4through the electrostatic method, followed by mixing with PLA by melt compounding. The APP-modified serpentine (serpentine@APP) dispersed uniformly in the PLA matrix. Compared with pure PLA, the PLA composite with 2 wt% serpentine@APP reduced the peak heat release rate (pHRR) and total heat release (THR) by 43.9% and 16.3%, respectively. The combination of APP and serpentine exhibited suitable synergistic flame-retardant effects on the fire safety enhancement of PLA. In addition, the dynamical rheological tests revealed that the presence of APP and serpentine could reduce the viscosity of PLA composites. The plasticizing effects of APP and serpentine benefited the processing of PLA. The mechanical properties of PLA/serpentine@APP maintained suitable performance as pure PLA. This study provided a feasible way to enhance the fire safety of PLA without sacrificing its mechanical properties.
研究领域:
材料科学
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消防安全
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高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）