JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 97
·期 5
·1293-1304
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IF 3.709
Le-Yao Wang,Zhen Yang,Feng Guo,Xiang-Li Long
BACKGROUND 2-nitro-4-methylsulfonylbenzoic acid (NMSBA) is commercially produced from the oxidation of 2-nitro-4-methylsulfonyltoluene (NMST) with nitric acid as oxidant and V 2 O 5 as catalyst in a strong acid solution; this process suffers from the following shortcomings: the discharge of large amounts of wastewater and waste gas, as along with the generation of polynitro compounds. It is necessary to develop a technology to avoid the pollution caused by oxidizing NMST with nitric acid. NMSBA can be synthesized by oxidizing NMST with air under the catalysis of the porous carbon made from coconut shell with ZnCl 2 as an activator together with Co/Mn/Br. RESULTS The optimum conditions for the preparation of the porous carbon are as follows: impregnation temperature 60 °C, ZnCl 2 concentration 0.50 mol L −1 , impregnation duration 6 h, carbonization temperature 600 °C, and carbonization time 4 h. The surface characterization suggests that the carbon made in this study holds smaller surface area, acidic groups, and basic groups than the commercial carbon but owns more carboxyl. CONCLUSION The Co/Mn/Br/AC (AC,the porous carbon made in this study) catalytic system is superior to the Co/Mn/Br/H 3 PMo 12 O 40 @CAC(CAC,commercial activated carbon) catalytic system in the production of NMSBA from the oxidation of NMST. The NMSBA selectivity gained by the former is 93.40%, while that gained by the latter is 87.14%. The former can cut down the consumption of NMST and the expenditure of catalysts. The catalytic ability of the AC catalyst relies on its surface chemical characteristics and physical properties. More carboxyl on AC is the reason for the upgrade of NMSBA selectivity. © 2022 Society of Chemical Industry (SCI).
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fengli Yang,Yi Su,Guangpin Lin,Jiawang Liu,Feifei Xia,Guobin Liang,Wei Lin,Huabing Zhang
Photocatalytic nitrogen fixation presents a promising alternative to the traditional Haber-Bosch process. In this study, Fe/Br co-doped bismuth molybdate (Fe/Br-BMO) was synthesized for the photocatalytic production of ammonia, achieving a production rate of 156.7 µmol g −1 h −1 . Characterization of the catalyst reveals that Fe/Br co-doping not only modifies the energy band structure and electronic properties of the catalyst but also expands the light absorption spectrum, inhibits the rapid recombination of photogenerated charge carriers, and increases both the specific surface area and the number of oxygen vacancies within the catalyst, which promote N 2 adsorption and activation and a significant reduction in the free energy of the rate-limiting step. These improvements effectively facilitate the adsorption and activation of N 2 molecules, lower the Gibbs free energy associated with the rate-limiting step, and ultimately enhance the photocatalytic activity
研究领域:
环境催化
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材料科学
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光催化
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能量转换
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无机化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Fengyun Zhang,Yaoqi Wei,Yaping Zhang,Huanhuan Zhang,Lei Jiang,Xiangfei Liang
The 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) spectrophotometric method is widely employed for uranium (U(VI)) determination due to its high sensitivity. However, conventional protocols require toxic sodium fluoride as both a masking agent and a stabilizer, posing environmental and operational risks. To address this limitation, we developed an eco-friendly alternative utilizing low-toxicity sodium dodecyl sulfonate (SDS) for dual-functional masking and stabilization. Critical parameters including pH, reagent stoichiometry, and reaction kinetics were systematically optimized. The Br-PADAP-U(VI) complex exhibited maximum absorbance at 576 nm (ε = 4.33 × 104 L mol−1 cm−1), with rapid color development and stable signal retention (>4 h) under ambient conditions. Linear Beer–Lambert compliance was observed within 0.0–4.0 μg per mL U(VI), yielding a Sandell sensitivity of 0.0055 μg cm−2. Notably, the method demonstrated exceptional tolerance toward coexisting ions (Na+, K+, Ca2+, Mg2+, Fe3+, Cl−, CO32−, and Cr2O72−). Validation via spike-recovery tests in environmental water samples achieved 96.4–104% recoveries (0.5%< RSD <2%), confirming the reliability for field-deployable U(VI) quantification with advantages of simplicity, rapidity, and accuracy.
研究领域:
分析化学
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环境化学
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光谱学
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核化学
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水质监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Shengqian Liang,Min Ma,Zheng Zheng,Jiahang Song,Yijian Zhou,Enzhou Liu,Haixia Ma,Bing Wang,Bo Zhou,Yan Nie,Zhuo Li
For the efficient harnessing of solar energy and mitigation of environmental pollution, the development and application of semiconductor photocatalysis technology is paramount. Herein, a novel SubPc-Br/CdS supramolecular array with an S-scheme heterojunction was synthesized through the intermolecular π-stacked self-assembly of subphthalocyanine (SubPc-Br) and nanometer cadmium sulfide (CdS). This self-assembly system features a highly structured architecture and excellent stability. Experiments and ground-state differential charge calculations demonstrate that SubPc-Br and CdS form a built-in electric field during the self-assembly process, a critical factor in promoting the dissociation of electrons and holes. Additionally, this study utilized time-dependent density functional theory (TDDFT) to simulate the dynamic adsorption behavior of excited oxygen molecules on the SubPc-Br/CdS interface for the first time. The analysis of molecular charge differential density under different excited states proved that the addition of SubPc-Br molecules not only improves the photocorrosion resistance of CdS in an O 2 adsorption environment but also enhances the production of advanced reactive oxygen species under the synergistic action of h + and ·O 2 – . When subjected to visible light, the degradation efficiency of minocycline (MC) achieved 96.8 % within 60 min and maintained 80.3 % after 5 cycles. In summary, this study highlights the feasibility of creating advanced S-scheme heterojunction photocatalysts through the strategic incorporation of organic supramolecules with semiconductor catalysts.
研究领域:
材料科学
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环境科学
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光催化技术
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Na Wei,Lin Liu,Jia-Qi Chu,Ting Fang,Zheng-Bo Han,Zhen Zhao
Metal-organic frameworks (MOFs) are widely studied for cycloaddition of CO 2 as a heterogeneous catalyst, because of their potential Lewis acidic sites and adjustable porous structure. However, most of them exhibit good catalytic performance need the assistance of nucleophilic co-catalysts. Herein, a novel MOFs and porous organic polymers (POPs) hybrid catalyst, core-shell ZIF-67@PDB-Br, is constructed by a convenient synthetic strategy, which possesses abundant Lewis acidic sites, imidazole cations and nucleophilic centers and shows robust chemical and thermal stability. This material demonstrates high-efficient catalytic activities and recyclability in the cycloaddition of CO 2 and propylene oxide without co-catalysts, the conversion and selectivity can reach 94.1 % and 99.0 %, respectively (100 °C, 1.0 MPa CO 2 pressure). Furthermore, the effects of the temperature, pressure, amount of catalyst and thickness of POPs shell on the catalytic activity were investigated. This study provides a viable direction for the development of synergistic heterogeneous catalysts for fixation of CO 2 without co-catalysts.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 6
·2047-2053
·
IF 7.059
Guojun Zhou,Zhiyang Liu,Maxim S. Molokeev,Zewen Xiao,Zhiguo Xia,Xian-Ming Zhang
Low-dimensional-networked metal halides are attractive for the screening of emitters applied in solid-state lighting and displays, but the lead toxicity and poor stability are obstacles that must be overcome in industrial applications. Herein, we aim at the discovery of bright and stable photoluminescence in zero-dimensional (0D) Mn2+-based metal halides. By manipulation of Cl/Br transmutation, the nature of the halogen can be confirmed as a pivotal factor to tune the PL behaviors, and the optimum Mn2+ emission with a high PLQY of 99.8% and a short lifetime of 0.372 ms can be achieved in (C24H20P)2MnBr4. The thermal quenching behaviors have been discussed in depth, indicating that the synergistic effect of good chemical stability of organic groups, a long Mn⋯Mn distance of 10.447 Å and a relatively large activation energy (ΔE = 0.277 eV) provides a platform for achieving excellent thermal stability in (C24H20P)2MnBr4. Moreover, the as-fabricated white LED device with a high luminous efficacy of 118.9 lm W−1 and a wide color gamut of 105.3% National Television System Committee (NTSC) shows that (C24H20P)2MnBr4 can be employed as a desirable narrow-band green emitter for LED displays. This work provides a new understanding of fine tailoring halogens, and proposes a feasible approach to achieving high thermal stability emitters toward the targeted practical applications.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2018
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IF 5.08
Le Liu,Tuanwei Li,Zheng Ruan,Pan Yuan,Lifeng Yan
A heavy atoms modified reaction-active photosensitizer NHS-BODIPY-Br possessing efficient near infrared (NIR) fluorescence emission and singlet oxygen generation properties has been synthesized, which can be used for synchronous NIR imaging and photodynamic therapy (PDT). A reduction-sensitive PEGylated polypeptide nanogel was prepared by ring-opening polymerization (ROP) of l -cystine- N -carboxy anhydride. Poly (ethylene glycol) methyl ether was used as initiator and hydrophilic segment, the as-prepared nanogel was conjugated with the NHS-BODIPY-Br molecule by chemical linkage, and it can be directly used as a macrophotosentizer for NIR imaging-guided PDT. In addition, the nanogel also showed good encapsulating ability for doxorubicin (DOX). In the presence of glutathione (10 mM), the obtained NIR nanogel showed obvious reduction-induced drug release behavior. In vitro tests on internalization of the NIR nanogel by HepG2 cells indicated its efficiency in detecting cancer cells. Meanwhile, MTT assays performed on HepG2 cells confirmed that the cancer cells growth could be obviously suppressed (almost all cells) when exposed to an extremely low energy light (25 mW/cm 2 , 10–15 J/cm 2 ) and low dose of DOX (3–5 μg/ml), indicates an efficient NIR image-guided chem/photodynamic therapy.
研究领域:
生物材料
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肿瘤学
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药剂学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Zhenxing Fang,Kuang Wu,Le Wang,Da Xu,Weiwei Wang,Yuhang Lin,Xiaohui Liu,Chun Sun
Mn doped two-dimensional (2D) layered perovskites , are becoming excellent candidates as red phosphor because of their high quantum yields (QY) and enhanced stability. However, these Mn doped 2D layered perovskites can only be excited by the near UV light , which largely limits the development of perovskites. Herein, blue-excitable Mn-doped PEA 2 (Pb/Mn)(Br/I) 4 PQDs are synthesized from anion exchange surface engineering strategy. After anion exchange, orange Mn 2+ emission from exciton-to-Mn energy transfer is acquired under the excitation of 450 nm. The PEA 2 (Pb/Mn)(Br/I) 4 compounds exhibit strong luminescence with photoluminescence (PL) QY of 52%, which is comparable to most of the reported red emitting phosphors. A prototype white light-emitting diode (WLED) with good optical performance was fabricated using commercial (Sr,Ba) 2 SiO 4 :Eu phosphor and as-prepared PEA 2 (Pb/Mn)(Br/I) 4 as green and orange color converters, showing great potential in the applications of solid state lighting.
研究领域:
材料科学
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光电
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固态照明
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuanyuan Cui,Jianmin Sun
The direct oxidative carboxylation of olefins and CO 2 to synthesize cyclic carbonates involves a tandem process of epoxidation and CO 2 cycloaddition reactions. However, designing a multifunctional catalyst for this reaction remains challenging. Herein, a composite catalyst ImBr@UiO-66-Br(Co) was synthesized by post-metallization of Co 2+ and subsequent functionalization with an imidazole ionic liquid (IL), which was used effectively for this reaction. The effects of temperature, CO 2 pressure, catalyst dosage, and reaction time on the direct oxidative carboxylation of olefins to cyclic carbonates were investigated. The results showed that ImBr@UiO-66-Br(Co) exhibited optimal performance in the solvent-free reaction system with styrene (3 mmol), tert -butyl hydroperoxide (6 mmol), and tetrabutylammonium bromide (TBAB, 50 mg) at 80 ℃ under 1 MPa CO 2 for 24 h, achieving a styrene conversion of 90.3 % and styrene carbonate selectivity of 80.7 %. The excellent catalytic activity of ImBr@UiO-66-Br(Co) was attributed to the synergistic interactions of the Lewis acidity Zr 4+ sites, the strong nucleophilicity provided by Br - , the weak base sites from tertiary amine and quaternary ammonium groups in imidazole IL, and the redox-active Co 2+ sites. Additionally, the catalyst was easy to separate and maintained stable activity and selectivity over at least five cycles. Finally, the potential catalytic mechanism for the direct oxidative carboxylation of olefins to cyclic carbonates was proposed.
研究领域:
材料化学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaomeng Yang,Zhen Zhang,Puhua Shao,Armin Rezayan,Dan Wu,Chunbao Charles Xu,Jianshe Wang,Yongsheng Zhang
Selective hydrogenolysis of 4-O-5 bond in lignin under relatively mild conditions is an important strategy for the production of valuable aromatic products, e.g. phenols, from renewable carbon resources. However, the easy saturation of benzene rings under reductive conditions over metal catalyst reduces the selectivity to aromatics. In this work, we investigated the effect of bromination of supported Ni nanoparticles on the phenol selectivity during the hydrogenolysis of diphenyl ether (DPE), a commonly used lignin model compound. Compared with the unmodified catalysts, Br-Ni/Al 2 O 3 catalyst derived from Ni-Al layered double oxides exhibits enhanced phenol selectivity (37% vs. 15%) under similar DPE conversions (60%). Various characterizations including transmission electron microscopy (TEM), in-situ X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), and CO-Fourier transform infrared spectroscopy (FTIR) indicate that Br preferentially located at the terrace site of Ni nanoparticles, deactivating the continuous Ni sites for benzene ring hydrogenation. In addition, the electron-withdrawing effect of Br creates positively charged Ni sites at the corners, facilitating the hydrogenolysis of C–O aryl ether bonds. During the hydrogenation of real lignin, the selective poisoning and electronic effects introduced by Br synergistically increased the yield of phenols from 12.20% on the initial Ni/Al 2 O 3 to 30.47% over the Br-Ni/Al 2 O 3 catalyst. This work provides an advanced strategy for the catalytic valorization of lignin by halogen modified metal-based catalysts.
研究领域:
催化
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化学工程
·
可再生能源
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Chemical Reactor Engineering
·
2022
·Vol. 21
·期 5
·663-678
·
IF 1.636
Feng Guo,Hua-jie Liu,Xin-zhi Zhou,Xiang-li Long
In this paper, a heterogeneous catalytic system consisting of Co/Mn/Br/activated carbon is used to catalyze 2-nitro-4-methylsulfonyl benzoic acid (NMSBA) production from the oxidation of 2-nitro-4-methylsulfonyltoluene (NMST) by oxygen. The activated carbon (AC) is made from coconut shell with acetic acid as an activator. The experiments indicate that the best AC is made by immersing coconut shell in 12 mol L −1 HAc solution at 50 °C for 32 h with a liquid/solid ratio (mL/g) of 5:1 and then being heated in nitrogen at 800 °C for 6 h. Compared with the Co/Mn/Br/H 3 PMo 12 O 40 @CAC (CAC, commercial activated carbon originated from coconut shell) catalytic system, the Co/Mn/Br/AC catalytic system is able to gain much higher NMSBA selectivity. In spite of holding smaller surface and less acidic groups, the AC owns much more carboxyl than CAC, which is the main reason for its better performance in the preparation of NMSBA.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Keyi Gu,Yongmin Duan,Shugang Li,Ying Tian,Juan Du,Junjie Zhang
In recent years, inorganic perovskite quantum dots (PQDs) have garnered significant attention, but the photoluminescence (PL) properties and stability of red-emitting PQDs need to be further enhanced. In this work, the precipitation of CsPb(Br/I) 3 quantum dots into borosilicate glass was effectively enabled by the high-temperature melt-quenching method. With the B 2 O 3 /SiO 2 ratio increased, the glass network structure gradually loosened, which enhanced the precipitation of PQDs. Simultaneously, the PL intensity of CsPb(Br/I) 3 PQDs glass increased, with a near twentyfold rise in the photoluminescence quantum yield (PLQY). The variable temperature test of PQDs glass shows that PQDs glass has good thermal stability. Finally, a red-emitting LED and a WLED were prepared by using the prepared red-emitting CsPb(Br/I) 3 PQDs glass. This paper serves as a reference for incorporating red-emitting CsPb(Br/I) 3 PQDs glass into WLED development.
研究领域:
材料科学
·
光学工程
✓ 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）