查找使用阿拉丁产品的科研文献

Ag/APTES/CuxO (x = 1, 2)-MGS-Coated No-Core Fiber Surface Plasmon Resonance Gas Sensor and Its Application in Hydrogen Sulfide Detection

Cheng Li,Liu Xiao,Xiaozhan Yang,Wenlin Feng

A comparative study on the activity and adsorption of bimetallic MOF-derived Me-Cu/TiO2 (Me=Fe, Co, Ni) for low-temperature selective catalytic reduction of NO by CO

Yong Shi,Xin Lan Ma,Jin Suo Gao,Feng Yun Yu,Chun Yan Li,Wei Xiong,Li Ping Huang

The catalytic activity, adsorption and synergistic effect over bimetallic MOF derivatives with different dopant metal were systemically compared. A series of Me-Cu/TiO 2 (Me=Fe, Co, Ni) derived from bimetallic Me/Cu-BTC MOFs were fabricated via a sacrificing template method and applied for CO-SCR. Among the bimetallic catalysts, Fe-Cu/TiO 2 presented the best low-temperature of nearly 100% NO conversion from 150 °C to 350 °C with good NO selectivity. For Me-Cu/TiO 2 (Me=Fe, Co, Ni), the productions of crucial Cu + intermediate were determined to be 51.17%, 50.45%,49.4% by XPS, which were consistent with their catalytic activity results. The superior redox behavior of Fe-Cu/TiO 2 can be attributed to its higher Oβ / (Oα +Oβ) ratio of 32.90% and the higher Me 2+ / Me 3+ ratio of 1.79. In situ infrared analysis revealed that the Fe doping not only improved the formation and stability of nitrate species, but also enhanced the quantity of Lewis acid sites by forming Cu + -CO. Furthermore, a possible low-temperature Langmuir-Hinshelwood (L-H) mechanism over Me-Cu /TiO 2 (Me=Fe, Co, Ni) was proposed.

Excellent low-temperature NH3-SCR of NO activity and resistance to H2O and SO2 over WaCeOx (a = 0.06, 0.12, 0.18, 0.24) catalysts: Key role of acidity derived from tungsten addition

Huansheng Tan,Shibo Ma,Xiaoyu Zhao,Yushi Li,Chen Zhao,Yujun Zhu

Bimetallic W a CeO x (a = 0.06, 0.12, 0.18, 0.24) catalysts were synthesized for selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). The influences of W on structure, activity and surface properties were investigated by XRF, XRD, Raman, TEM, N 2 adsorption-desorption, H 2 -TPR, O 2 /NH 3 /SO 2 -TPD, XPS, and in-situ DRIFTS. The characterization results show that the W/Ce ratio has a great effect on the NH 3 -SCR activity. The different catalytic activities of W a CeO x are mainly attributed to the acidity change, especially the increase of B-acid content plays a major role in enhancing low temperature activity. W 0.18 CeO x exhibits excellent low-temperature NH 3 -SCR activity, SO 2 /H 2 O resistance and N 2 selectivity with a broad activity window (190–490 °C) with 5%H 2 O. Moreover, good activity window (235–460 °C) can be maintained even the catalyst treated with 5% H 2 O at 800 °C for 12 h, showing especial hydrothermal stability. Thus, it can be summarized that W 0.18 CeO x is regarded as outstanding catalyst for low-temperature NH 3 -SCR of NO.

Uptake Kinetics of \({\text{NH}_{4}^{+} }\), \({\text{NO}_{3}^{-} }\) and \({\text{H}_{2}\text{PO}_{4}^{-} }\) by Typha orientalis, Acorus calamus L., Lythrum salicaria L., Sagittaria trifolia L. and Alisma plantago-aquatica Linn

Kunlun Wang,Qian Hu,Yumin Wei,Hui Yin,Changhong Sun,Guizhong Liu

The emergent plants may differ in their capacity to assimilate nutrients from eutrophic water bodies, so the utilization of suitable emergent plants is the key part for successful restoration of shallow eutrophic lakes and rivers. This research applied the depletion method to study the kinetics of uptake of nutrient (H2PO4−,NH4+,NO3−) in different nutrient stresses by the five emergent aquatic plants (Acorus calamusL.,Typha orientalis, Lythrum salicariaL.,Sagittaria trifoliaL.,Alisma plantago-aquaticaLinn) in the riverine zones of Dashi River (39°30′–39°40′ N, 115°59′–116°5′ E), a shallow eutrophic river located in Fangshan District, Beijing. The results showed that at the three phosphorus levels,A. calamusandA. plantago-aquaticahad the highest maximum uptake rate values forNH4+under low to moderate phosphorus conditions, and high phosphorus, respectively.T. orientalishad the highest maximum uptake rate values forNO3−at all phosphorus concentrations, while the Michaelis-Menten constant values ofL. salicariaandA. plantago-aquaticawere smaller. At the three nitrogen levels, the maximum uptake rate values forH2PO4−were the greatest forA. plantago-aquaticaat the low to moderate nitrogen levels andL. salicariaat high levels. Meanwhile,T. orientalisandL. salicariahad the smallest Michaelis-Menten constant values. In this study, nitrogen microbial transformations, such as nitrification, denitrification and their coupling were not measured and their role in measuring kinetics was not assessed. Thus, achieved results shall be considered as a synthesis of several processes mediated by plants, a theoretical guidance to the selection of plant species for phytoremediation of polluted water bodies with different nutrient stresses for quality improvement around the diverse rivers in Haihe River basin.Keywords:emergent plants;eutrophication;nitrogen;phosphorus;uptake kinetics;stress

In situ no-slot joint integration of half-metallic C(CN)3 cocatalyst into g-C3N4 scaffold: An absolute metal-free in-plane heterosystem for efficient and selective photoconversion of CO2 into CO

Yong Yang,Zheng Tang,Baojing Zhou,Jinyou Shen,Huichao He,Amjad Ali,Qin Zhong,Yujie Xiong,Chao Gao,Ahmed Alsaedi,Tasawar Hayat,Xiaoyong Wang,Yong Zhou,Zhigang Zou

An absolute metal-free in-plane heterosystem consisting of g-C 3 N 4 as scaffold and embedded half-metallic C(CN) 3 as cocatalysts was conceptually designed for photoconversion of CO 2 . The no-slot joint between half-metallic C(CN) 3 and g-C 3 N 4 through covalent bonding generates a unique two-dimensional, π-conjugated hybrid structure, allowing obstacle-free transferring of the photogenerated electrons in g-C 3 N 4 into C(CN) 3 via an intrinsic driving force. Our theoretical calculations together with the in-situ Fourier transform infrared spectra indicate that the most negative charge distribution and binding energy with CO 2 for C(CN) 3 allow outstanding capture and chemical activation capacity toward CO 2 , and subsequently enable the optimized heterosystem to exhibit highly efficient and selective photocatalytic reduction of CO 2 into CO, 7.8 and 1.9 times those produced with pristine and Pt-modified g-C 3 N 4 , respectively. The no-slot joint of organic half-metal cocatalysts with g-C 3 N 4 may open up new opportunities for metal-free, polymer-based photocatalytic systems for CO 2 conversion and solar fuel generation.

A Novel Feruloyl Esterase-Producing Strain ZH-1 Belonging to Bacillus altitudinis from Baijiu Distiller’s Grains and Its Enzyme Cocktail with No Detectable β-Xylosidase Activity for Producing Functional Sugars from Arabinoxylan-Type Substrates

Ruonan Wang,Yi Yang,Mengyang Huang,Xiaoge Li,Xinying Wu,Zihan Zhu,Jing Yang,Kongyang Wu,Zitai Sang

Arabinoxylan-rich agricultural residues are promising feedstocks for the production of high-value functional sugars and ferulic acid, yet their efficient enzymatic conversion is hindered by the complex crosslinked structures. This study aimed to isolate a novel feruloyl esterase-producing strain from Baijiu distiller’s grains and evaluate its enzyme cocktail for arabinoxylan degradation. A novel strain,Bacillus altitudinisZH-1, was isolated and systematically characterized. Through one-factor-at-a-time optimization of both the medium and cultivation conditions, the feruloyl esterase activity was substantially increased (15.78-fold) compared with the activity obtained in the unoptimized Luria-Bertani (LB) medium. Genomic analysis revealed 103 unique carbohydrate-active enzyme (CAZyme)-encoding genes, including endoxylanases, α-L-arabinofuranosidases, and three putative feruloyl esterases. Studies on enzymatic properties revealed that the extracellular enzyme cocktail exhibited a hemicellulase-dominated profile and no detectable β-xylosidase activity under the assay conditions, with the three key enzymes showing over 76% of their maximum activity at pH 6.0 and 50 °C. In the degradation of insoluble wheat arabinoxylan, the enzyme cocktail released L-arabinose (69.00 mg/g substrate) and a xylooligosaccharides-equivalent fraction (244.00 mg/g substrate), which together accounted for 99.57% of total reducing sugars, along with ferulic acid (1.23 mg/g substrate). When applied to de-starched wheat bran, the enzyme cocktail achieved reducing sugar yields comparable to the commercial enzyme CTec2, while producing significantly higher levels of L-arabinose and xylooligosaccharides. These findings highlight the ZH-1 enzyme cocktail as an arabinoxylan-targeting biocatalyst with no detectable β-xylosidase activity under the assay conditions, showing promising potential for producing high-value functional sugars and ferulic acid from agricultural residues.