CHEMICAL GEOLOGY
·
2022
·
IF 4.685
Hao Cui,Richen Zhong,Zimeng Li,Huan Chen,Chang Yu,Yanxia Li,Yifan Ling
Raman spectroscopy is a crucial technology in geoscience and often employed in in situ quantification experiments to investigate fluid compositions at elevated temperatures. Raman spectroscopic quantification is fundamental to understanding the hydrothermal behaviors of aqueous species, such as SO 4 2− and H 3 PO 4 0 . Considering that SO 4 2− and PO 4 3− are closely associated with metal transportation and deposition, investigating the hydrothermal behaviors of these species, via Raman spectroscopic quantification, can give an assistance for the comprehension of relative ore-forming processes. During Raman spectroscopic quantification, the accuracy of the calibration coefficient ( k ), which bridges the concentration of a species ( C species ) and its Raman peak area ( A normalized ) in the form of C species = k · A normalized , is the key to accurate measurement of fluid composition. For high-temperature experiments, quantification of fluid composition is complicated because the coefficient k varies with varying temperatures. In this study, the temperature dependence of the calibration coefficients is retrieved, based on experiments on solutions containing SO 4 2− and H 3 PO 4 0 using the fused silica capillary capsules. The results show a well-established linear relationship between the k and 1/ T (absolute temperature in Kelvin) for both SO 4 2− and H 3 PO 4 0 . The reported linear k − 1/ T relationship simplifies Raman-based fluid composition investigation at elevated temperatures: the k values throughout the whole temperature range of interest can be retrieved by measuring the room-temperature Raman intensity of a standard sample (i.e., with known composition) and one single data point at high temperature. We speculate that this linear k − 1/ T relationship method may be established for other species (e.g., carbonate ions) and can be applied for experiments using other technics (e.g., hydrothermal diamond anvil cell) or retrieving the compositions of natural or synthetic fluid inclusions . For example, the empirical linear relationship can facilitate the measurements of gas concentrations (e.g., CO 2 ) in natural fluid inclusions .
研究领域:
地质科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Puxiang Yan,Haiyong Wang,Yuhe Liao,Chenguang Wang
Upgrading biomass to renewable diesel and jet fuels is essential to achieve carbon neutrality. Herein, diesel and jet fuels range alkanes were produced by HAA of 2-methylfuran and furfural over solid acid SO 4 2- /TiO 2 and subsequent HDO over Pd/NbOPO 4 . A series of SO 4 2- /TiO 2 catalysts were synthesized by wetness impregnation to produce C15 fuel precursors. S/Ti-450 with a calcination temperature of 450 °C exhibited the highest activity, affording 97.9 % yield of C15 fuel precursor. Sufficient Brønsted acid sites and moderate Brønsted acid strength are responsible for the super catalytic performance of S/Ti-450. Stability studies demonstrated that S/Ti-450 could be regenerated. Furthermore, the application of S/Ti-450 in the HAA reaction was extended to other carbonyl compounds (e.g., butanal, cyclohexanone and acetone) and high yields of desired fuel precursors were obtained. Finally, C15 fuel precursor was further converted to long-chain alkanes via HDO over Pd/NbOPO 4 , yielding 85.0 % diesel and jet fuels range alkanes.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Yingjie Niu,Ting Li,Ali Hassan Bhatti,Jiaqi Qu,Xin Zhou,Li Luo,Francesco Barzagli,Chao'en Li,Rui Zhang
The use of solid acid catalysts for sorbent regeneration is an emerging approach to improve the energy efficiency of CO 2 capture processes. In this study, fly ash (FA), an industrial byproduct rich in acid/base sites, was chosen as a support material for the solid acid SO 4 2− /ZrO 2 (SZ) in the preparation of SZ@FA composite catalysts. Three catalysts with different mass ratios between SZ and FA were synthesized and evaluated in the regeneration process at 88 °C of a CO 2 -saturated MEA solution. Their desorption performance, expressed as CO 2 desorption rate, amount of CO 2 desorbed , and heat duty, was then compared with that obtained with unmodified FA, ZrO 2, and in the absence of catalysts (blank), under identical operating conditions. Compared to the uncatalyzed system, the SZ@FA composite catalysts showed significantly better desorption performance. In particular, SZ@FA-1/2 provided the highest values of desorption rate and cyclic capacity while reducing energy consumption by 45.4% compared to the blank system. It also demonstrated stability over 20 consecutive absorption-desorption cycles. Comparison with other reported catalysts highlighted the high performance of SZ@FA-1/2, particularly in terms of relative heat duty reduction, positioning it as a cost-effective and environmentally friendly choice for post-combustion capture applications.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2018
·Vol. 25
·期 6
·2585-2594
·
IF 2.347
Meng Fanbo,Guo Huajun,Wang Zhixing,Wang Jiexi,Yan Guochun,Wu Xianwen,Li Xinhai,Zhou Lijiao
A series of layered Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 cathode materials, of which manganese source was electrolytic manganese dioxide, with different contents of SO 4 2− were successfully synthesized via ball-milling process and solid-state sintering method. The obtained materials were characterized by XRD, XPS, SEM-EDS, C-S, ICP, and HR-TEM. All the obtained materials presented well-ordered layered structure. When the content of SO 4 2− was below 1.30 wt%, the electrochemical properties and structural stabilities at low rate for the layered materials with SO 4 2− were not changed dramatically, while when the content of SO 4 2− increased to 5.85 wt%, the initial discharge capacities decreased dramatically from 248.24 to 209.23 mAh g −1 at 10 mA g −1 . And the pristine sample shows excellent cyclic property and rate capability. It delivered the discharge capacity of 175.25 mAh g −1 after 100 cycles with the highest capacity retention of 90.67% at 200 mA g −1 . Particularly, the treated Li-rich Mn-based materials with the highest amount of SO 4 2− exhibited the best cyclic stability and it delivers the highest capacity retention of 95.17% after 100 cycles at 200 mA g −1 . However, its discharge capacities were much lower than the pristine material. As a result, the addition of SO 4 2− could promote side reactions between electrode and electrolyte and deep-degree corrosion of electrode materials to affect the electrochemical properties and structural stabilities of the Li-rich Mn-based materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jingjing Hu,Wei Cheng,Yishuo Zhao,Yian Song,Huan Xu,Hao Zhou,Huifang Yang,Jie Sun,Ruan Chi
Recently, bi-functional catalysts have emerged as an effective approach for enhancing the performance of electro-Fenton in degrading antibiotics by simultaneously improving H 2 O 2 generation and Fe circulation. Herein, we prepared a SO 4 2- modified Ce x Zr 1-x O 2 bi-functional catalyst to construct an efficient e-Fenton system for degrading norfloxacin. Results display that the fabricated catalyst exhibited superior performance in degrading norfloxacin owing to durative generated ⋅OH, which was proved to be the dominant active species. The H 2 O 2 generation capacity of that catalyst was twice higher than the pure e-Fenton and its faradaic efficiency even came up to 75%. The amount of soluble total Fe and Fe 2+ ions of that catalyst were both increased twofold compared to the blank system, declaring the acceleration of Fe recycling process. Characterizations and density function theory calculations proposed a synergistic mechanism that attributed the simultaneously improvement in H 2 O 2 generation and Fe 2+ circulation to the multiple regulated interface properties, the promoted 2e - ORR activity caused by enriched oxygen vacancies at Ce sites, and the accelerated electrons transfer owing to the strengthened acidic sites for the coordination between Zr sites and S species. Furthermore, that catalyst is also proved to be feasible, well-recycled and practical for application in wastewater purification.
研究领域:
环境科学
·
催化材料
·
废水处理技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2026
·
IF 6.6
Xianyou Tang,Yunkun Lu,Hang Yin,Guannan Zhou,Lili Guo,Wenguan Liu,Zhongfeng Tang
Effect of SO 4 2 ‐ in NaCl-MgCl 2 on corrosion of 316SS was first studied at 600 °C. • Intergranular corrosion became more obvious with increased SO 4 2 ‐ concentration. • Corrosive of 316SS increased continuously with SO 4 2 ‐ concentration increased. • SO 4 2 ‐ concentration in NaCl-MgCl 2 salt should be controlled within 0.05% in Ar. NaCl-MgCl 2 molten salts are promising heat transfer fluids and thermal energy storage media for next-generation concentrating solar power (CSP) systems. However, the corrosion of the stainless steel in NaCl-MgCl 2 molten salt containing sulfate impurities remains a significant challenge for practical application. In this work, the corrosion behavior of 316 stainless steel (316SS) was systematically investigated in NaCl-MgCl 2 (58.0-42.0 mol%) eutectic molten salts containing 0.005-5.0 wt% SO 4 2− at 600 °C for 240 h under Ar. The corrosion of 316SS samples increased markedly with SO 4 2− concentration. At low impurity levels, only slight surface degradation and limited elemental depletion were observed. In contrast, elevated SO 4 2− concentrations caused severe corrosion-layer degradation, accelerated selective dissolution of Cr and Fe, and pronounced localized and intergranular corrosion. A critical impurity threshold of 0.05 wt% SO 4 2− was identified, beyond which the weight loss increased sharply to 1.96 mg cm −2 and significant intergranular attack developed. Furthermore, increasing the SO 4 2− concentration from 1.0 to 5.0 wt% promoted the transition from localized corrosion to extensive grain-boundary penetration. Mechanistic analysis indicates that sulfur-induced precipitation of Mo–S- and Mn–S-containing species, together with selective alloy dissolution, destabilizes the protective corrosion layer through a synergistic sulfidation-oxidation mechanism. These findings establish a practical sulfate impurity limit for NaCl-MgCl 2 salts and provide important guidance for molten salt purification, impurity control, and structural material selection in CSP thermal energy storage systems.
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Yuru Zhou,Jing Hu,Yinan Liu,Wenyu Fan,Panpan Tao,Rui Yang,Haitao Huang,Xun Cao,Haijin Li,Siwei Li
Designing noble metal-free electrocatalysts remains a challenge for the oxygen evolution reaction (OER) in alkaline solutions. In this study, we present a facile electrodeposition approach coupled with an in situ anodic oxidation method to synthesize NiOOH–MnS/NF on nickel foam (NF), successfully creating NiOOH–MnOOH/NF heterojunctions to boost OER performance under alkaline conditions. The heterojunction's synergistic effect significantly modulates the adsorption energy of the rate-determining step (RDS), thereby enhancing the intrinsic electrocatalytic activity of the NiOOH–MnOOH/NF electrocatalyst. Furthermore, the introduction of SO42− leads to a variable degree of electron loss in both Mn and Ni, reducing adsorption strength of the OER intermediates and thus optimizing reaction kinetics. The as-prepared NiOOH–MnOOH/NF electrocatalyst demonstrates exceptional OER performance in 1.0 M KOH, achieving a current density of 100 mA cm−2 with a Tafel slope of 52.3 mV dec−1 and a minimal overpotential of 391 mV. Utilizing NiOOH–MnOOH/NF as a bifunctional electrode for overall water splitting (OWS), the system operates at a low potential of 1.66 V at 10 mA cm−2, showcasing its excellent durability. This work offers novel insights and promising prospects for the advancement and practical application of non-precious metal electrocatalysts in the field of electrocatalytic water splitting.
研究领域:
电化学
·
材料科学
·
催化
·
能量转换与存储
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Yuling Ren,Pengfei Qi,Yinhua Wan,Chulong Chen,Xiangrong Chen,Shichao Feng,Jianquan Luo
A nanofiltration (NF) membrane with high salt permeation and high retention of small organics is appealing for the treatment of high-salinity organic wastewater. However, the conventional negatively charged NF membranes commonly show high retention of divalent anions (e.g., SO42–), and the reported positively charged NF membranes normally suffer super low selectivity for small organics/Na2SO4 and high fouling potential. In this work, we propose a novel “etching–swelling–planting” strategy assisted by interfacial polymerization and mussel-inspired catecholamine chemistry to prepare a mix-charged NF membrane. By X-ray photoelectron spectroscopy depth profiling and pore size distribution analysis, it was found that such a strategy could not only deepen the positive charge distribution but also narrow the pore size. Molecular dynamics confirm that the planted polyethyleneimine chains play an important role to relay SO42– ions to facilitate their transport across the membrane, thus reversing the retention of Na2SO4 and glucose (43 vs 71%). Meanwhile, due to the high surface hydrophilicity and smoothness as well as the preservation of abundant negatively charged groups (−OH and −COOH) inside the separation layer, the obtained membrane exhibited excellent antifouling performance, even for the coking wastewater. This study advances the importance of vertical charge distribution of NF membranes in separation selectivity and antifouling performance.
研究领域:
膜科学
·
水处理
·
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）