APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Hai-Min Shen,Gong-Yuan Zhu,Wu-Bin Yu,Hong-Ke Wu,Hong-Bing Ji,Hong-Xin Shi,Yuan-Bin She,Yi-Fan Zheng
Renewable β -cyclodextrin ( β -CD) was grafted onto the surface of silica gel using (3-chloropropyl)trimethoxysilane and ethylenediamine as linking groups to construct adsorbent in water treatment (CD@Si), and the obtained CD@Si was characterized through FT-IR, XPS, contact angle measurement, TGA, solid-state 13 C NMR, SEM, and XRD analyses. The effects of initial pH, contact time on the adsorption performance of CD@Si to p -nitrophenol, and the adsorption kinetics, adsorption isotherms, adsorption thermodynamics, reusability and adsorption mechanism were investigated systematically, which indicate the adsorption of p -nitrophenol onto CD@Si is a very fast process and the adsorption equilibrium can be reached in 5 s with acceptable equilibrium adsorption capacity of 41.5 mg/g in pH ≥8.5, much faster than many reported adsorbents based on β -CD. The adsorption of p -nitrophenol onto CD@Si follows the pseudo-second-order model, obeys the Freundlich model, and is a feasible, spontaneous and exothermic process which is more favorable in lower temperature. And the formation of inclusion complex and hydrogen bond interaction are two origins of p -nitrophenol being adsorbed onto CD@Si. Additionally, CD@Si can be recycled and reused at least five runs with acceptable adsorption capacity, is a very promising adsorbent in the fast adsorption of p -nitrophenol or its analogues from aqueous phase.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2022
·
IF 12.545
Qing Yu Liu,Zhen Qi Bu,Min Xia Quan,Ying Wu,Xuezhi Ding,Li Qiu Xia,Jiao Yang Lu,Wei Tao Huang
Inspired by information processing and communication in nature based on molecular recognition and structural diversity, ongoing efforts aim to development of artificial molecular or nano-systems for sensing, logic computing, and even data storage and safety. However, due to their preparation/functionalization shortcomings (laborious and time-consuming), poor flexibility and compatibility, and limited paradigm, it is still a big challenge whether simple molecules can be used to achieve comprehensive and universal applications from sensing to information storage and protection. Herein, we for the first time demonstrated a molecular paradigm—computer-like “basic input output system (BIOS)” which can realize “plug-and-play” sensing, information encoding, molecular cryptography, and steganography based on a simple artificial molecule (p-nitrophenol, PNP). Based on its molecular recognition and inherent chemical identities, PNP was utilized for colorimetric detection of multiple metal ions (Hg 2+ , Fe 3+ , Al 3+ , Cr 3+ ) and distinguishing their valence (like Cr 3+ /Cr 6+ , Fe 3+ /Fe 2+ ). Interestingly, PNP can achieve the “plug-and-play” fluorescent expansion of detection channels by directly mixing with fluorescent molecules, indicating that PNP molecule can be served as a molecular BIOS with flexibility and compatibility. Impressively, the selectivity embedded in PNP-based BIOS sensing system can be developed as molecular-level double cryptographic steganography to encode, encrypt and hide specific information (like the content of classical literature). This research not only provides a basic idea for building a molecular paradigm with “plug-and-play” flexibility and compatibility, but also provides ideas for the use of molecular sensing and informatization to open up the digitalization of the molecular world.
研究领域:
化学
·
信息科学
·
分子生物学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2013
·Vol. 299
·期 3
·361-367
·
IF 2.338
Weining Sun,Xiaofeng Lu,Yanpeng Xue,Yan Tong,Ce Wang
In this report, CoFe 2 O 4 /Polypyrrole (PPy)/Pd ternary composite nanofibers are fabricated through a one-step redox reaction between pyrrole and Na 2 PdCl 4 in the presence of electrospun CoFe 2 O 4 nanofibers in ethylene glycol (EG). The generation of Pd nanoparticles is accompanied by the formation of PPy on the surface of electrospun CoFe 2 O 4 nanofibers during the redox reaction. The as-prepared CoFe 2 O 4 /PPy/Pd composite nanofibers may be used as efficient catalysts for the p -nitrophenol hydrogenation with an apparent rate constant ( k app ) of about 13.2 × 10 −3 s −1 . The CoFe 2 O 4 /PPy/Pd composite nanofibers show good magnetic properties, which can be readily recycled under an external magnetic field.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jaehyeong Park,Sungjun Bae
In this study, a magnetically recyclable Pd catalyst was developed by using the novel support of iron-rich coal fly ash/silica (IRFA@SiO 2 ) for highly efficient reduction of p -nitrophenol ( p -NP). IRFA microspheres were coated with amorphous SiO 2 synthesized from non-magnetic coal fly ash (NMFA) and then loaded with Pd by impregnation method for the synthesis of Pd/IRFA@SiO 2 . Various surface analyses demonstrated that amorphous SiO 2 was well deposited on the surface of IRFA, providing a unique three-dimensionally structured SiO 2 layer to suppress aggregation of IRFA and enhance dispersion of Pd nanoparticles. Pd/IRFA@SiO 2 exhibited a significantly enhanced p -NP reduction than those of Pd/IRFA, Pd/Al 2 O 3 , and Pd/SiO 2 . Compared to other Pd- and metal-loaded catalysts, Pd/IRFA@SiO 2 showed ˜4000× enhancements in k obs-p-NP /C M (L min −1 g M −1 , M = precious metals) values and ˜3800× increases in price-normalized k obs-p-NP values, indicating that Pd/IRFA@SiO 2 is a highly efficient and cost-effective alternative catalyst. The catalyst was successfully recycled five times without significant leaching of Pd, Si, and heavy metals because of the magnetic property of Pd/IRFA@SiO 2 . The experimental results suggest the applicability of the surface-modified IRFA support for the development of novel magnetically recoverable catalysts without severe toxicity problems.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Tao Xu,Meihui Jiang,Xuhui Mao,Falak Sher,Tianlin Ren,Kun Xin,Irshad Hussain,Helin Hua,Xu Wang
This study investigated the important role of hydroxyl groups for the preparation of γ-Al 2 O 3 sphere supported metal catalysts. γ-Al 2 O 3 spheres were calcinated at varied temperatures for the analysis of surface hydroxyl group, and they were subsequently loaded with iron to evaluate the metal dispersion and the performance for catalytic ozonation. The results showed that the critical site for metal anchoring was hydroxyl group, thus a higher hydroxyl group content favored the metal dispersion on γ-Al 2 O 3 spheres; meanwhile, the iron-loaded catalysts prepared by the γ-Al 2 O 3 support calcinated at 300 °C achieved the highest catalytic efficiency for p -nitrophenol degradation (74.6 %). The favorable performance of the catalyst was attributed to the excellent dispersion of iron oxide particles, and the abundant oxygen vacancy sites that facilitated the formation of ozone-activating sites, Fe-centered hydroxyl groups ([Fe-OH]). This study provides an important theoretical guidance for the design and application of ozone catalysts.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2013
·Vol. 18
·期 10
·12609-12620
·
IF 2.428
Chao Lin,Kai Tao,Dayin Hua,Zhen Ma,Shenghu Zhou
Gold nanoparticles (Au NPs) were prepared by reducing HAuCl4with NaBH4. Their average particle sizes could be tuned in the range of 1.7 and 8.2 nm, by adjusting the amount of NaBH4used during synthesis. The obtained Au NPs (colloids) were then loaded onto a commercial Al2O3support to prepare Au/Al2O3catalysts with tunable Au particle sizes. An optimal pH value (5.9) of the Au colloid solution was found to be essential for loading Au NPs onto Al2O3while avoiding the growth of Au NPs. Au NPs and Au/Al2O3catalysts were tested in the reduction ofp-nitrophenol with NaBH4. Interestingly, the catalytic activity depended on the size of Au NPs, being the highest when the average size was 3.4 nm. Relevant characterization by UV-Vis, TEM, and XRD was conducted.
研究领域:
化学
·
材料科学
·
催化
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2023
·
IF 0
Yuchao Chen,Li Wang,Yufei Shu,Qi Han,Beizhao Chen,Mengxia Wang,Xun Liu,Danyal Rehman,Bei Liu,Zhongying Wang,John Lienhard
The economic value of recovering gold from electronic waste (e-waste) has generated significant interest, but selective capture of gold from complex acidic electronic leaching solutions remains challenging. Here, we synthesized poly-m-phenylenediamine (PmPD) nanoparticles with a positively charged surface and amino functional groups, resulting in an adsorption capacity of 2063 mg/g for Au(III) in acidic solutions, superior to most traditional adsorbents. Electrostatic adsorption and reduction were identified as the adsorption mechanism for Au(III) by zeta potential, X-ray diffraction, transmission electron microscope, Fourier transform infrared, and X-ray photoelectron spectroscopy analyses. To enable adsorbent recycling, PmPD nanoparticles were assembled into adsorptive membranes and used for gold recovery from e-wastewater via a continuous-flow membrane separation process. The PmPD membrane achieved a dynamic gold recovery capacity of approximately 530 mg/g and could be effectively regenerated after washing with a mixture of thiourea and HCl. We demonstrated the practical application of the adsorptive membranes by recovering about 100% of gold from the leaching solution of waste printed circuit boards of computers. Finally, the recovered gold nanoparticles on the PmPD membrane were used to catalyze the degradation of p-nitrophenol, showcasing the catalytic property of gold. The Au@PmPD membrane loaded with 4 mg gold exhibited a high catalytic reduction performance with an apparent rate constant of 0.59 min–1, one of the highest catalytic degradation rate constants of p-nitrophenol reported to date. Our study presents an effective and economical approach for recovering gold from e-waste, providing a prototype of resource recovery and reuse.
研究领域:
环境科学
·
材料科学
·
化学工程
·
资源回收
·
催化作用
✓ 已验证
DOI
TALANTA
·
2024
·
IF 5.6
Shuangying Li,Xiaozhong Gao,Linchun Nie,Lutong Bu,Guangyu Dong,Denghao Song,Wenjing Liu,Dejing Meng,Xiaodie Geng,Qingxiang Zhou
In this work, a sensitive fluorescent sensor toward p-nitrophenol (4-NP) integrating magnetic molecularly imprinted materials and carbon dots (CDs) was proposed. Magnetic material and CDs derived from K 3 [Fe(CN) 6 ] and glucose were simultaneously obtained through simple one-step hydrothermal process. Introducing of molecularly imprinted materials based magnetic solid phase extraction (MSPE) endowed the constructed fluorescent sensor with higher sensitivity and selectivity. The significant factors affecting the sensitivity of the sensor toward 4-NP were optimized. Good linearity was obtained between fluorescent intensity of CDs and different concentration of 4-NP from 0.08 to 62.5 μg L −1 . The sensitivity of constructed sensor was very low with detection limit of 0.02 μg L −1 . Reliable applicability was also proved by the well-pleasing recoveries of 94.2–97.8% with different spiked concentrations of 4-NP in real environmental waters.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 15
·7012-7019
·
IF 3.269
Tianxing Wu,Guozhong Wang,Yunxia Zhang,Shenghong Kang,Haimin Zhang
Through the slight dissolution of a Pt mesh counter electrode, Pt-deposited carbon fiber cloth (Pt/CFC) was successfully fabricated by successive cyclic voltammetry (CV) scanning from −0.77 V to 0.20 V (vs. RHE) in 0.5 M H2SO4 electrolyte. In the process of successive CV scanning, the electrocatalytic activity of CFC toward the hydrogen evolution reaction (HER) becomes better and better owing to Pt deposition on CFC, and after 1000 CV cycles, the onset potential of CFC is identical to that of the commercial Pt/C catalyst (0 V, vs. RHE) with high current densities at low overpotentials (η10, η100, and η170 = 4.5, 34.5, and 43.5 mV at current densities of 10, 100 and 170 mA cm−2). Interestingly, it was found that as-prepared Pt/CFC exhibits decreased HER activity with an onset potential of −0.26 V (vs. RHE) when Pt mesh was changed to bare CFC as the counter electrode, mainly due to the lower Pt loading amount (0.5 mg cm−2) on CFC compared to commercial Pt/C (Pt loading amount of 1.0 mg cm−2) and the inert CFC counter electrode (not like the Pt mesh counter electrode with slight dissolution in acidic media during CV scanning). Generally, there is great competition between the HER from water splitting and hydrogenation reduction of organic matter using the same HER-active electrocatalyst under identical experimental conditions. In this work, Pt/CFC was, therefore, evaluated for hydrogenation reduction of p-nitrophenol (PNP) to p-aminophenol (PAP) using water as the hydrogen donor in a CFC counter electrode configurated two-compartment reaction system. The results demonstrate that PNP can be effectively converted into PAP with a conversion efficiency of 83.1% and a Faradaic efficiency of 9.9% after electrocatalytic reaction for 12 h at an overpotential of −0.023 V. The findings of this work indicate that Pt counter electrodes are prone to dissolving, resulting in Pt deposition on the working electrode in acidic media, readily causing the false appearance of a non-Pt working electrode with high HER activity. Additionally, the Pt-deposited working electrode produced by this electrochemical approach is efficient for hydrogenation reduction of organic substances into high value-added chemicals using water as the hydrogenation donor.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 15
·期 3
·560-569
·
IF 3.842
Zhifeng Jiang,Jimin Xie,Deli Jiang,Xiaojun Wei,Min Chen
Nickel nanoparticles with different sizes and morphologies were prepared with nickel chloride as the source of nickel and hydrazine hydrate as a reductant. Cetyltrimethyl ammonium bromide (CTAB), polyethylene glycol-10000 (PEG-10000), gelatin and their composites were used as modifiers in this research. The particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR). The effect of using single modifiers and their composites was investigated. The results revealed that the kind of modifier used had a significant effect on the morphology and size of the Ni nanostructure. The possible formation mechanism of nickel nanoparticles was also investigated. All of the formed nickel nanoparticles showed excellent catalytic activity in the reduction of p-nitrophenol compared to the commercial RANEY® Ni. The catalytic activity of nickel particles prepared in the presence of composite modifiers was higher than nano nickel catalysts prepared in the presence of single modifiers. The magnetic property, possible catalytic mechanism and the possibility of reusability were also investigated.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jia Lu,Qingqing Chen,Sibai Chen,Hong Jiang,Yefei Liu,Rizhi Chen
Atomic layer deposition (ALD) was adopted for the first time to load Pd nanoparticles on Al2O3 ceramic membranes (CMs) for fabricating catalytic membranes (Pd/CMs). The membrane surface was functionalized with the deposition of TiO2 by ALD and subsequent calcination under different atmospheres [CM-TiO2-A, obtained by calcination under an atmosphere of pure argon; CM-TiO2-H, obtained by calcination under a mixed atmosphere of H2 and Ar (H2/Ar = 1:9 in volume)]. The influence of the TiO2 deposition on the microstructure of catalytic membranes and their catalytic performance in p-nitrophenol reduction to p-aminophenol were investigated in detail. The catalytic activity of Pd/CM-TiO2-H improved by 1.9 times compared to Pd/CM, and 100% conversion of p-nitrophenol to p-aminophenol can be achieved. The X-ray photoelectron spectroscopy (XPS), inductively coupled plasma emission spectroscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy results indicate that the ALD of TiO2 and subsequent calcination under a 10% H2 atmosphere can produce more surface oxygen vacancies, providing more active sites for Pd(hfac)2 adsorption and then promoting the loading of Pd nanoparticles. The XPS and H2 temperature-programmed reduction results suggest that calcining TiO2 under the 10% H2 atmosphere is more beneficial for the removal of the hfac ligands and the reduction of Pd(hfac)2, leading to a higher Pd0 ratio. These two aspects contribute to the superior catalytic activity of Pd/CM-TiO2-H.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 103
·84410-84422
·
IF 3.84
Hai-Min Shen,Gong-Yuan Zhu,Wu-Bin Yu,Hong-Ke Wu,Hong-Bing Ji,Hong-Xin Shi,Yi-Fan Zheng,Yuan-Bin She
Renewable β-cyclodextrin (β-CD) was immobilized onto the surface of hybrid silica using ethylenediamine as linking groups to construct an adsorbent in water treatment (CD@Si), and the obtained CD@Si was characterized through FT-IR, XPS, EDX, contact angle measurement, TGA, solid-state 13C NMR, SEM, and XRD analyses. The effect of initial pH, contact time on the adsorption performance of CD@Si for p-nitrophenol, and the adsorption kinetics, adsorption isotherms, adsorption thermodynamics, reusability and adsorption mechanism were investigated systematically, which indicate that the adsorption of p-nitrophenol onto CD@Si is a very fast process. The adsorption equilibrium can be reached in 15 s with an acceptable equilibrium adsorption capacity of 69.6 mg g−1 at pH 7.0, which is much faster than many reported adsorbents based on β-CD. The adsorption of p-nitrophenol onto CD@Si follows the pseudo-second-order model, obeys the Freundlich model, and is a feasible, spontaneous, and exothermic process which is more favorable at lower temperatures. And the formation of an inclusion complex and a hydrogen bond interaction are two origins of p-nitrophenol being adsorbed onto CD@Si. Additionally, CD@Si can be recycled and reused for at least five runs with an acceptable adsorption capacity, and is a very promising adsorbent for the fast adsorption of p-nitrophenol or its analogues from the aqueous phase. Additionally, this work also provides a strategy to increase the adsorption rate of adsorbents based on β-CD.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）