Alexandria Engineering Journal
·
2020
·
IF 2.46
Saifeldin M. Siddeeg,Abdelfattah Amari,Mohamed A. Tahoon,Norah Salem Alsaiari,Faouzi Ben Rebah
For the simultaneous removal of water contaminants, a novel nanocomposite has been produced. The iron oxide core with silica shell was used to prepare functional magnetic polymer Fe 3 O 4 /SiO 2 /glycidyl methacrylate (GMA)-S-SH nanocomposite. The sulfur functional nanocomposite is suitable for the immobilization of laccase enzyme. The synthesized nanocomposite was characterized using FT-IR spectroscopy, SEM, TEM, XRD, and magnetometer. The effect of pH, temperature, and storage time over free and immobilized enzyme was studied that indicating the higher stability of immobilized enzyme than that free one. The prepared novel nanocomposite showed high adsorption capacity toward Cd +2 ions in addition to the degradation of meloxicam and piroxicam anti-inflammatory drugs. The removal efficiency reached up to 94% ± 2%, 92% ± 2%, and 95% ± 2% for Cd +2 ions, meloxicam, and piroxicam, respectively at optimum pH and temperature. Also, the results show that this nanocomposite is recyclable. The efficient removal of Cd +2 ions and pharmaceuticals can be reached up to four cycles. We conclude that the prepared nanocomposite is promising for water treatment.
研究领域:
环境科学
·
生物技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Wenchao Niu,Xiaoshan Qiu,Pingxiao Wu,Wenqi Guan,Yihao Zhan,Luwei Jin,Nengwu Zhu
Aluminol groups are effective for removing toxic metal ions . However, their use is significantly limited because they are usually on the inner surface of halloysite tubes. Herein, we realign and expose the abundant aluminol groups using a hydrothermal process. We found that dickite was gradually formed with increased sodium metasilicate proportion. Also, a uniform mushroom-like structure was formed, extending from the orifice to the middle of the hollow tubes and eventually forming a sphere. Further, part of the halloysite tube gradually broke, expanding into lamellar, eventually forming a small spheroid. The Al-O-Si groups were fractured by sodium metasilicate and aluminol groups on the inner surface of halloysite tubes, forming many aluminol groups. Moreover, the average pore size of the halloysite increased, indicating that numerous halloysite mesopores converted to dickite macropores . Thus, we inferred that the tubes gradually unfolded when the metasilicate first binds with the aluminol groups on the inner of the halloysite tubes. The modification enhanced the material's adsorption capacity for Pb 2+ , Cd 2+ , and Cr 3+ nearly 20, 12, and 10 times, respectively, stronger than the original halloysite mineral. Consequently, exposing and realigning aluminol groups of halloysite significantly improved toxic metal ions' removal.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 20
·9472-9483
·
IF 2.302
Wang Qiang,Feng Jin,Ma Lirong,Wei Wei,Xie Jimin,Xia Changkun,Zhu Jianjun,Jiang Deli
Monolithic silica aerogels were prepared by sol–gel process via ambient drying process. TEOS and APTES were used as coprecursors and wet gels were crosslinked by three kinds of diisocyanate. The strengthened silica aerogels possess densities which range from 0.298 to 0.463 g/cm 3 , and the specific surface areas range from 81.17 to 135.48 m 2 /g. In this paper, silica aerogels crosslinked with different diisocyanate were used as adsorbents for the removal of heavy metals. At the same time, some factors such as the initial pH and concentration of heavy metals were investigated by a batch of experiments. The equilibrium sorption data have been fitted by different isotherm model, and the data fitting by Freundlich isotherm model indicates that the process of adsorption is favorable. Under the condition of the optimum adsorption pH, the maximum theoretical adsorption capacity computed from Langmuir model is 118.73 mg/g for Pb 2+ , 57.03 mg/g for Cr 3+ , and 60.86 mg/g for Cd 2+ , respectively with the silica aerogels crosslinked with 1,6-hexamethylene diisocyanate (HDI).
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 12
·2102423
·
IF 6.389
Guihao Zhong,Dingxin Liu
Photocatalytic splitting of water into hydrogen has attracted growing concerns as a promising strategy for the development of clean and renewable energy sources. Fabricating novel photocatalysts with high H 2 evolution rate and good cyclic stability is extremely vital for practical applications. Herein, a novel CdS/Cd 2 SO 4 (OH) 2 composite derived from cadmium nitrate doped Cd-MOF is deposited on the surface of butterfly wings with reticular hierarchical structure for efficient hydrogen evolution reaction. The combination of unique hierarchical structure and MOF-derived CdS nanoparticles endows them with strong light absorbability, small band gap, and superior photogenerated charges separation efficiency, leading to excellent photocatalytic efficiency. Furthermore, in-depth measurements reveal the reduction of Cd 2 SO 4 (OH) 2 to Cd on the surface of CdS particle during the photocatalytic process. The obtained Cd metal can act as the electron trap to improve the charge separation efficiency and further promote the hydrogen production performance. As a result, the MOF-derived CdS/Cd 2 SO 4 (OH) 2 and final CdS/Cd systems with reticular hierarchical structure exhibit significantly enhanced hydrogen production performance compared with CdS/Cd 2 SO 4 (OH) 2 powder and MOF-derived CdS nanoparticles under visible light irradiation. It is expected that this synthetic approach can be used to fabricate other composite photocatalyst materials with reticular hierarchical structure for efficient water splitting to hydrogen.
研究领域:
材料科学
·
能源转换与存储
·
纳米技术
·
光化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Qionghao Wang,Yaqi Peng,Min Chen,Mengxia Xu,Jiamin Ding,Qi Yao,Shengyong Lu
The process of urbanization has resulted in a continuous growth of the production of municipal solid waste , consequently leading to the increase of municipal solid waste incineration fly ash (MSWI FA) over time. This has prompted the need for effective disposal and value-added utilization strategies for MSWI FA. In this study, a hydrothermal method was employed to synthesize Ca Al layered double hydroxides (LDHs) using MSWI FA as the raw material. The main objective was to investigate how different synthesis parameters affect the crystallinity of the layered bimetallic hydroxides. Subsequently, the synthesized LDHs were characterized using various techniques such as BET, SEM , XRD, FT-IR, and XPS. The results revealed the presence of calcium and aluminum cations in the interlayer region of the synthesized material, with chloride ions, sulfate ions, and acetate ions being the predominant anions. Moreover, the formation of LDHs presents an effective approach for the self-purification of leachates derived from MSWI FA. The LDHs exhibited excellent adsorption capacity for Cd 2+ and Cu 2+ in wastewater, with maximum values of 730 mg·g −1 and 446 mg·g −1 , respectively. The adsorption mechanisms involved isomorphous substitution, complexation, as well as the precipitation of hydroxides or interlayer anions. This method presents a novel approach for effectively utilizing MSWI FA to produce environmentally friendly value-added adsorbents.
研究领域:
环境科学
·
废物管理
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xinxing Wang,Youxiao Qi,You Shen,Yue Yuan,Lindi Zhang,Chongyu Zhang,Yanhui Sun
It is a significant and challenging task to simultaneously detection of multiple heavy metal ions with convenience, sensitivity and reliability. Herein, a novel ratiometric electrochemical sensing method was established for the simultaneously detection of three main heavy metal ion pollutants (Cd 2+ , Pb 2+ and Cu 2+ ). The sensing platform was constructed by a composite of ferrocenecarboxylic acid functionalized metal-organic framework (MOF), Fc-NH 2 -UiO-66, and thermally reduced graphene oxide (trGNO), which was designated as trGNO/Fc-NH 2 -UiO-66. NH 2 -UiO-66 has porous structure and large specific surface area, which is beneficial to the adsorption and preconcentration of heavy metal ions. The introduction of trGNO and Fc improves the conductivity and electrochemical activity of the MOF material. Moreover, the signal of Fc can be used as internal reference to develop ratiometric detection, which greatly improves the reproducibility and reliability of electrochemical detection. Based on this ratiometric electrochemical sensing platform, the simultaneous, sensitive and reliable detection of Cd 2+ , Pb 2+ and Cu 2+ was realized. This work provides a new sensing platform for simultaneous detection of multiple heavy metal ions and greatly expands the application of UiO-66-type MOFs in electrochemical field.
研究领域:
分析化学
·
环境科学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiaxuan Lu,Zhonghua Yao,Hua Hao,Minghe Cao,Hanxing Liu
Field-driven transition from antiferroelectric (AFE) to ferroelectric (FE) states has gained extensive attention for microelectronics and energy storage applications. High dielectric-breakdown-strength (DBDS) for a given material is a necessity to attain full capacity of electrical energy storage . An approach to increasing energy performances is to modulate the related materials to own a higher phase transition electric field ( E FE-AFE ) using elemental dopants . In this case, Cd 2+ was selected as the dopant at A-site in the Pb 0.97 La 0.02 Zr 0.50 Sn 0.45 Ti 0.05 O 3 ceramics to tailor this E FE-AFE value due to the ionic difference enhanced antiferroelectricity. Surprisingly, the doped ceramics increased E FE-AFE by half, DBDS by 16 %, and maintained energy storage efficiency η of over 85 %, providing a way to improve energy storage density. It is worth mentioning that while the performance has been improved, the sintering temperature has been reduced by 170 °C. At the same time, the ceramics maintain good temperature stability, extremely fast discharging speed and discharging energy storage density, indicative of a promising choice in pulse power devices.
研究领域:
材料科学
·
电气工程
·
陶瓷
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）