Desalination and Water Treatment
·
2024
·
IF 1
Yifan Gu,Mingyu Liu,Mengmeng Yang,Weili Wang,Shusheng Zhang,Runping Han
ABSTRACT Polyethyleneimine (PEI)-functionalized carboxylated multi-walled carbon nanotubes (MWCNTs) were used as an adsorbent (PEI-CNTs) to adsorb light green (LG) dyes (anionic dye) from solution. The structure and morphology of PEI-CNTs was characterized by transmission electron microscope, Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). FTIR and XPS results showed that PEI was successfully loaded on MWCNTs. Raman analysis showed that the basic structure of MWCNTs did not change after the modification of PEI. The effects of pH and coexisting ions on the adsorption properties were studied. Batch adsorption and kinetic studies showed that the PEI-CNTs nanocomposite materials were efficient to remove LG from solution. The optimum condition for adsorption was pH 3. The adsorption of LG solution reached equilibrium within 5 h of contact time with a removal of 97%. Adsorption quantity was 469 mg·g –1 at 293 K. Adsorption equilibrium data can be predicted by Langmuir model and Koble–Corrigan model, while the kinetic adsorption data followed pseudo-second-order model. The thermodynamic results showed that the adsorption was a spontaneous process with endothermic reaction and entropy increasing. LG-loaded adsorbent can be regenerated using 0.010 mol·L –1 of NaOH solution.
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Desalination and Water Treatment
·
2024
·
IF 1
Zijun Zhong,Ruopeng Xu,Huijuan He,Qiuna Zhuang,Langhuan Huang
ABSTRACT A novel g-C 3 N 4 /MoS 2 heterojunction photocatalyst with high efficient visible-light-region was fabricated by a facile calcination method. The composite with various weight ratios of g-C 3 N 4 and MoS 2 was synthesized and characterized. The results showed that MoS 2 was uniformly distributed on the surface of g-C 3 N 4 , resulting in the formation of heterostructure. The photocatalyst showed excellent photocatalytic activity in the photodegradation of organic pollutants. The optimized g-C 3 N 4 /MoS 2 sample (10-CNM) exhibited 94% (Methylene Blue) degradation efficiency after being irradiated for 2 h under visible light. At last, the possible mechanism of the enhanced photocatalytic activity was discussed.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Xiaoyan Gan,Ou Wang,Keyong Liu,Xiangjun Du,Liling Guo,Hanxing Liu
We present the fabrication and characterization of two dimensional (2D) perovskites (PEA) 2 (MA) m-1 Pb m I 3 m+1 (PEA=phenylethylammonium, MA=methylammonium, m=1,2,3) for application as light absorbers in solar cells. Films of 2D perovskite series show high stability under humid air , with band gaps decreasing with increasing m values, from 2.36 eV for (PEA) 2 PbI 4 (m=1) to 1.94 eV for (PEA) 2 (MA) 2 Pb 3 I 10 (m=3). Owning to the smaller bandgap, favorable vertical growth characteristics, and appropriate energy band structure of (PEA) 2 (MA) 2 Pb 3 I 10 , planer perovskite solar cells based on (PEA) 2 (MA) 2 Pb 3 I 10 exhibit best cell performance. Incorporation of TiO 2 nanorod arrays into (PEA) 2 (MA) 2 Pb 3 I 7 based perovskite solar cells are further found to be useful in improving the cell performance, ascribing to the improved quality and coverage of the perovskite films, as well as the enhanced electronic contact between the perovskites and the electron transporting layer. By optimizing the TiO 2 NR lengths, an efficiency of 3.72% is obtained for (PEA) 2 (MA) 2 Pb 3 I 10 perovskite cells with 600 nm-long TiO 2 NRs as scaffolds, which is more than a time higher than that of the planer analogue device. Our study to design 2D perovskite solar cells demonstrates the importance of material structure and device configuration for efficient solar cells, highlighting the validity of TiO 2 nanorods in functionalizing 2D perovskites for photovoltaic applications.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2014
·
IF 4.331
Chengqun Xu,Honghai Wu,Feng Long Gu
BiOBr/Na–montmorillonite composites (BiOBr–Mt) were prepared under laboratory ambient conditions by using the surfactant cetyltrimethylammonium bromide (CTAB) as the Br source and template, and the as-synthesized samples were characterized by XRD, FT-IR, FESEM, TEM equipped with EDS, BET and UV–vis DRS techniques. Interestingly, the particle size of BiOBr can be controlled by CTAB modified Na-montmorillonite. The photocatalytic activity of the as-prepared was further evaluated by decomposition of Rhodamine B (RhB) under visible light irradiation; the obtained results revealed that the BiOBr–Mt sample had strong photoabsorption in the visible light region. It has higher photocatalytic activity than pure BiOBr alone. There exists an efficient adsorption for RhB onto BiOBr–Mt contrast to that onto the pure BiOBr. The adsorption processes can be well described by pseudo-second-order kinetic model; meanwhile, the adsorption behaviors can be described by both Freundlich and Langmuir equations but the former was better. Additionally, the relevant adsorption and degradation mechanisms were explored and the possible mechanisms were presented. The photocatalytic activity has high effect both in acidic and basic conditions on the degradation reaction but in acidic condition is more favorable. After three recycles, BiOBr–Mt did not exhibit any significant loss of photocatalytic activity, confirming the photocatalyst was essentially stable.
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POLYMER COMPOSITES
·
2011
·Vol. 32
·期 8
·1235-1244
·
IF 0.998
Dandan Su,Wenkai Chang,Guiping Ma,Gang Wu,Jun Nie
The light-curable composite of siloxane/hydroxyapatite (HA) had been successfully achieved by photopolymerization of a kind of gel combined tetraethoxyorthosilicate (TEOS) and 3-methacryloxypropyltrimethoxysilane (MAPS) with siloxane-modified nano-HA (HA- g -Si). HA- g -Si was prepared by grafting reaction of 3-isocyanatopropyltrimethoxysilane (IPS) onto the surface of HA. Then, TEOS and MAPS were mixed as precursor, and photoinitiator 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure 2959) and as-prepared HA- g -Si were added into the precursor to form a homogenous and sticky gel. The movable gel that could be cured with UV light resulted in various sharp immovable composites of siloxane/HA in different mold. The HA, HA- g -Si nanoparticles, and composites were analyzed by Fourier transformed infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, scanning electron microscopy, mechanical testing, and water contact angles. It could be a promising bone repairing material for orthopedic application. POLYM. COMPOS., © 2011 Society of Plastics Engineers.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qiang Chen,Yujun Wang,Guangsheng Luo
Photocatalytic direct decarboxylative carbonylation of ubiquitous carboxylic acids is a promising strategy to obtain highly versatile ketone building blocks, but metal-free and efficient conversions are still lacking. Here, density functional theory calculations are used to guide the experimental screening of catalysts, highlighting the potential influence of frontier molecular orbital energy levels on the catalytic process and revealing an acridine photocatalyst capable of realizing value-added conversion of carboxylic acid at room temperature under visible light with excellent performance. The possible mechanism for this conversion was elucidated in depth by combining study of the excited state behavior of the photosensitizer and the results of detection experiments for radicals. Theoretical calculations and mechanistic studies further disclose the kinetically rate-limiting role of oxygen, including its participation in the formation of superoxide radicals for carbonylation and as an electron trapping agent for catalyst cycling. Based on these findings, a flow microreactor platform was ingeniously built to achieve previously inaccessible photocatalytic decarboxylative carbonylation promoted by acridine in concert with oxygen. Interestingly, the gas–liquid segmented microflow is found to enable a significant acceleration (from 14 to 2 h) and higher yield compared to the batch counterpart, resulting in a high space–time yield of 137.4 g/L d -1 for this transformation, which far exceeds the reported values. This study underscores the feasibility of broadening the competence of acridine photocatalysis through the involvement of kinetically adapted oxygen, thus enabling substitution of metal-dependent photocatalysis and even more efficient and high-yield decarboxylative carbonylation of carboxylic acids.
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Shuaijie Chen,Minghui Yang,Haihui Li,Haitao Zhao,Xiang Xu,Weiwei He,Lifen Zhang,Zhenping Cheng
Photoinduced reversible-deactivation radical polymerization (RDRP) has attracted great interest in virtue to their unique inherent advantages, such as low activation energy, environmentally benign reaction conditions and precision synthesis of designable functional polymeric materials. In this work, a facile and efficient strategy for preparing block copolymers was developed by the combination of near-infrared (NIR) light-controlled in-situ bromine-iodine transformation reversible-deactivation radical polymerization (BIT-RDRP) and purple LED light induced ring-opening polymerization (ROP). Herein, the macroinitiator was first synthesized via NIR light-controlled BIT-RDRP by using a bifunctional 2-hydroxyethyl 2-bromo-2-phenylacetate (EBP-OH) as the initiator at room temperature. Subsequently the block copolymers with narrow dispersity (low up to 1.06) were prepared by combination of purple LED light induced ROP through “two step” or “one pot” process. Importantly, the “one pot” strategy can greatly simplify the operation process and improve the synthesis efficiency, which will facilitate the batch preparation of block copolymers.
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2013
·Vol. 214
·期 6
·716-725
·
IF 2.386
Li Ma,Jinze Li,Dan Han,Haiping Geng,Guangxin Chen,Qifang Li
A series of polyhedral oligomeric silsesquioxane end-capped poly(spiropyran-containing methacrylate) (POSS–PSPMA) polymers, a kind of photoresponsive hybrid polymer, are synthesized via atom transfer radical polymerization. It is proved that the molecular weight of POSS–PSPMA is sharply increased by raising the proportion of methanol or the concentration of the reactants. The self-assembly behavior of POSS–PSPMA is studied in toluene: under the control of UV and visible light, POSS–PSPMA can reversibly self-assemble into aggregates because the charged merocyanines (MC) form stacks. These MC stacks act as non-covalent crosslinking points and POSS shell guarantees the stability of the aggregates. This system has a broad potential use in nanocarriers, especially for encapsulating and releasing polar substances in the nonpolar solvents.
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高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 3
·954-964
·
IF 6.8
Chen Jiayue,Cao Meilian,Yue Yiying
The high-value utilization of lignin meets the demand for the reclamation of wastes and is of great significance for achieving carbon neutrality. However, lignin is unstable and prone to melting and deformation at high temperatures, requiring a long period of stabilization. The carbon nanofiber (CNF) membrane prepared by electrospinning has advantages such as high aspect ratio, low density, good light absorption, and a large number of pores favorable for steam transportation. Based on co-electrospinning, a lignin-based CNF membrane material was prepared in this work. The preparation process of this material can not only save the stabilization time of lignin-based nanofibers but also improves the hydrophilicity and light absorbance of the membrane through zinc chloride activation and the addition of pore-forming agents (terephthalic acid and polymethyl methacrylate). As a photothermal layer of an interfacial solar evaporation system, the membrane has a light absorption of 94.3% over the whole sun spectrum. Furthermore, the interfacial solar evaporation system with the prepared CNF membrane as the photothermal layer has an evaporation rate of 1.43 kg m −2 h −1 under one sun, with an evaporation efficiency of 93.8%. In addition, the evaporator has good circulation and salt resistance ability. After 15 h of continuous illumination, it still maintains excellent evaporation rate. This type of CNF membrane with lignin as the main carbon source has great potential as a photothermal conversion material in future desalination applications.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 8
·1-8
·
IF 2.278
Ren Yanlin,Zhao Qidong,Li Xinyong,Xiong Wei,Tade Moses,Liu Lihong
A novel visible-light-activated photocatalyst consisting of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles were synthesized through a tunable in situ deposition method. The morphology and microstructure of the C 3 N 4 /Ag 3 PO 4 nanocomposites were carefully characterized by scanning electron microscope, TEM, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectra, and so on. The porous C 3 N 4 /Ag 3 PO 4 nanocomposites were featured by the typical platelet-like morphology, with an average crystallite size of about 39 nm. The coexistence of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles is confirmed via the XRD and EDX results. Owing to its narrower band gap of Ag 3 PO 4 , the nanocomposites displayed a significant redshift of UV–Vis spectral absorption edge together with expanded light absorption in comparison with g-C 3 N 4 nanosheets. The photocatalytic activity of the prepared C 3 N 4 /Ag 3 PO 4 nanocomposites is demonstrated by the photodegradation of 4-chlorophenol (4-CP). The C 3 N 4 /Ag 3 PO 4 nanocomposites displayed higher photocatalytic activity than pure C 3 N 4 or Ag 3 PO 4 , which could be attributed to the interfacial effect of the nanocomposites in inhibiting the unfavorable recombination of photogenerated electrons and holes. Electron spin resonance spin-trap study implied that the generation of hydroxyl radicals plays the key role in the photodegradation of 4-CP by the C 3 N 4 /Ag 3 PO 4 nanocomposites under visible light irradiation.
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Journal of Physical Chemistry Letters
·
2022
·
IF 6.888
Kailei Lu,Yucheng Ye,Wenhan Han,Cong Zhang,Lexing Liang,Haifeng Yuan,Yanli Shi,Jianqi Qi,Tiecheng Lu
In the most promising new window materials, the light-blocking property of the state-of-the-art transparent polycrystalline ceramics is still located in the UV range, which undoubtedly limits their applications. Herein, a transparent Y2Zr2O7:Tb (YZO:Tb) ceramic for light-shielding windows was prepared by a solid-state reaction and vacuum sintering method. Two simple and efficient routes, with doping concentrations varying and air-annealing temperatures regulating, were developed for the first time to control the content of defect clusters [TbY4+–O2––TbY4+] and [TbY4+–e•], enabling the optical cutoff waveband of these ceramics spanning from UV and BV to green light. These defect clusters generated from an air-annealing process were proposed for the relevant reaction mechanisms concerning light erasure behavior. The controllably tailoring of optical cutoff wavelength from Tb single-doped YZO ceramics, adjusted by defect clusters, may open a novel door to develop lanthanide-doped transparent ceramics for wide-range tunable light-shielding windows.
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Desalination and Water Treatment
·
2024
·
IF 1
Huiya Wang,Keqiang Ding,Danping Shao,Guoqiang Pan
In this study, water-soluble graphitic carbon nitride nanosheets (WS-CNNS) were successfully prepared by using the KOH/NaOH melt, and the synthesized WS-CNNS could be applied to the environmental treatment. The photocatalytic degradation experimental results showed that the WS-CNNS has great photocatalytic activity for photocatalytic degradation of Methylene blue (MB). Moreover, the capture experiments shown that H 2 O 2 played an important role in the photocatalytic degradation of MB. The superior photocatalytic performance of WS-CNNS was mainly ascribed to the characteristics of water solubility together with optical properties. This research provides a new perspective for the application of graphitic carbon nitride nanosheets in environmental remediation.
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