WATER RESEARCH
·
2024
·
IF 11.4
Chuanjin Lin,Zhenhua Xin,Shijie Yuan,Jing Sun,Bin Dong,Zuxin Xu
Sludge hydrothermal carbonization demonstrates potential for converting sludge into multifunctional carbon materials for soil remediation. However, the influence of dissolved organic matter (DOM) with unclear molecular characteristics in sludge-based hydrothermal carbon on plant growth has not been sufficiently investigated. Herein, the effects of hydrothermal temperature on the molecular transformation pathways and plant-growth-promoting properties of DOM were investigated via FT-ICR MS–based molecular network analyses and seed germination experiments. Results indicated that the highest DOM yield was achieved at 220 °C. During low-temperature (180 °C) hydrothermal treatment, the hydrolysis of biopolymers, as well as the partial condensation and cyclization of small-molecule intermediates, occurred in the sludge. This process produced unsaturated CHNO compounds containing one or two N atoms, which promoted seed germination. Further, the toxicity of DOM to plants increased with rising hydrothermal temperature. This was accompanied by S doping and aromatization reactions, which mitigated the effects of plant growth hormones. This study provides theoretical support for the optimization of sludge hydrothermal treatment and production of plant growth hormones, enhancing the ecological value of sludge-based hydrochar .
研究领域:
环境科学
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
Aggregate
·
2024
·Vol. 5
·期 4
·e570
·
IF 13.9
Yang Li,Zhenwei Wu,Yanhong Liu,Kun Zhang,Sha Luo,Wei Li,Shouxin Liu
The hydrothermal/soft templating method is an effective way to synthesize ordered mesoporous carbon (OMC), yet the mechanism of this strategy is not well illustrated. Herein, a hydrothermal temperature-controlled approach is developed to precisely synthesize OMCs with well-defined morphologies from liquefied wood (LW). As the hydrothermal temperature increases from 130 to 210°C, the hydrophilicity of the hydrophilic blocks decreases accompanied by the increase of the relative volume of the hydrophobic block, resulting in the packing parameter p of micelles changing from p ≤ 1/3 to 1/3 < p < 1/2, which transforms the micelle's structure from spherical to cylindrical. Additionally, accelerated nucleation occurred with the increased hydrothermal temperature. When the rate of nucleation is matched to the self-assembly of the composite micelles, the composite micelles grow into worm-like morphology and an ordered p 6m mesostructure. This hydrothermal temperature-controlled strategy provides a straightforward and effective approach for synthesizing OMCs with various morphologies from LW, addressing the previously insufficiently elucidated micelle formation mechanism in the hydrothermal/soft templating method.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Dan Chen,Kan Li,Hanyue Bao,Ming Zhai,Zhong Wang,Xiaozhi Wang
In this paper, a series of Ce@Mn core-shell catalysts were synthesized via a two-step hydrothermal method. Hydrothermal temperature significantly influenced the structure formation of catalysts. The Ce@Mn-150 catalyst, synthesized at 150 °C exhibited a well-defined core-shell structure. Moreover, it converted approximately 35 % of HCHO into CO 2 and H 2 O at ambient temperature, and achieved 90 % conversion of HCHO at 90 °C. Through structural characterization of the catalysts, distinct morphological differences were observed across all samples. The Ce@Mn-150 catalyst, which demonstrated the optimal catalytic activity, exhibited the most complete core-shell structure. The formation of the core-shell structure promoted the generation of Ce-Mn interfacial effects, which in turn modulated the interactions between Ce and Mn species . Elemental valence state characterization revealed that the well-defined core-shell structure facilitated the generation of Mn 3+ and Ce 3+ species, along with enhanced concentrations of surface-adsorbed oxygen (O ads ) and oxygen vacancies (O v ), which collectively enhanced HCHO adsorption and activation. H 2 -TPR results indicated that the core-shell structure enhanced the low-temperature reducibility of the catalyst and preserved abundant oxygen vacancies. This study revealed the influence of core-shell structures and intermetallic interactions at the core-shell interface on the catalytic performance of the catalyst, providing insights for designing efficient non-noble metal catalysts for HCHO removal.
研究领域:
环境催化
·
材料化学
·
大气污染控制
·
表面科学
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 4
·2444-2453
·
IF 1.938
Wang Jinhua,Yang Shuai,Chang Jingming,Pang Shishi,Fu Hongquan,Jiang Feng,Liao Yunwen,Gao Hejun
The effects of hydrothermal temperature on the photocatalytic degradation performance of bismuth oxide formate were investigated using Bi(NO 3 ) 3 ·5H 2 O and N , N -dimethylformamide prepared by a simple hydrothermal process. Its structure and properties were analyzed by field emission scanning electron microscope, Fourier transform infrared spectroscopy, x-ray powder diffraction, and ultraviolet and visible absorption spectra. The photocatalytic degradation performance was evaluated in tetracycline solutions. Temperature has a great influence on the morphology of BiOCOOH, and reduces the width of the energy gap. The photocatalytic degradation rate of BiOCOOH prepared at 160°C (BiO-160) with regard to tetracycline was 3.2 times that at 140°C. Within 70 min, BiO-160 can almost completely degrade 10 mg/L of tetracycline in aqueous solution. Photocatalytic mechanisms showed that ·OH plays a major role, while ·O 2 − plays a secondary role in the photocatalytic degradation of tetracycline by BiO-160.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Mengyao Yun,Tao Chen,Ning Zhao,Zhenhua Li
Energy is of great importance for the development of modern society, which is mostly dependent on crude oil. Due to the severe pollution caused by using crude oil and the diminishing of crude oil reserves, it is urgent to look for clean oil from alternative resource other than crude oil. Currently, Coal-to-Liquid (CTL) or Biomass-to-Liquid (BTL) technology is an important way to produce clean liquid fuels through Fischer-Tropsch Synthesis (FTS) of syngas. For FTS process, catalyst is a main factor for affecting on syngas conversion and product distribution. For traditional oxides-supported catalysts, the mutual constraint between active metal loading and dispersion at high metal loading is hard to overcome, which will hinder the synthesis of high-performance FTS catalysts. In this paper, a new type of Co@SiO 2 -T (CS-T) and Co@SiO 2 -X (CS-X) catalysts with core-shell structure were prepared by using polyvinyl pyrrolidone (PVP) as the structural stabilizer, hexadecyl trimethyl ammonium Bromide (CTAB) as the templating agent and tetraethyl orthosilicate (TEOS) as the silica source. The effects of hydrothermal temperature and pyrolysis temperature on the catalyst physical-chemical properties and FTS performance were investigated. The results showed that increasing the hydrothermal temperature favored the formation of the core-shell structure of the catalysts. With the increase of pyrolysis temperature, the catalyst particle size decreased from 0.54 μm to 0.23 μm. The FTS activities of the catalysts showed a volcano trend with hydrothermal and pyrolysis temperatures.
研究领域:
能源化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Kok Bing Tan,Pan Tian,Xinxin Zhang,Jian Tian,Guowu Zhan,Jiale Huang,Qingbiao Li
The present study developed bifunctional catalyst for CO 2 hydrogenation into dimethyl ether (DME), whereby it consists of Pd/In 2 O 3 for CO 2 hydrogenation into methanol, and H-ZSM-5 for methanol dehydration into DME. The catalyst development was focused on the synthesis of Pd/In 2 O 3 via a green and low-cost synthesis method of carbonized alginate templating. Thus, microspherical-confined nano-Pd/In 2 O 3 was formed, whereby the localized nucleation growth was coordinated by the chemically entrapped In 3+ via ionic bond in the well-distributed alginate structure. It was found that hydrothermal temperature plays a key role in the development of this catalyst structure. The optimum hydrothermal temperature is 160 °C, as it is able to produce the highest amount of methanol. This catalyst was further integrated with H-ZSM-5 via different integration manners. It was found that mortar mixed method produces the highest amount of DME, as the close proximity causes stronger ion-exchange mechanism between the catalyst components, which facilitates higher oxygen vacancy density in the bifunctional catalyst. Under the optimum Pd/In 2 O 3 : H-ZSM-5 (PdIn-160–12: H-ZSM-5) mass ratio of 4:1, the highest STY DME of 79.7 g DME kg cat -1 h −1 with CO 2 conversion of 9% and DME selectivity of 44.1% can be achieved. In addition, the STY DME can be maintained even in 60 h on stream, demonstrating the excellent stability and performance of microspherical-confined nano-Pd/In 2 O 3 /H-ZSM-5 bifunctional catalyst synthesized via carbonized alginate templating strategy.
研究领域:
催化
·
化学工程
·
材料科学
·
环境化学
·
能源科学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 7
·2000278
·
IF 3.404
Xiang Guan,Yuanxing Yong,Qingping Wu,Xiaowan Zhang,Xuhong Guo,Chilin Li,Jun Xu
High-capacity silicon anodes have attracted tremendous interest for next-generation lithium-ion batteries (LIBs). However, its further application is limited by the large volume expansion during cycling. Designing nanostructured silicon is an effective strategy to acquire high-performance anodes, but it will face problems of high cost and poor coulombic efficiency. As a comparison, surface modification of micron silicon is more economically viable. Herein, a novel route is proposed to synthesize metal-chelated biomimetic polyelectrolyte as a powerful binder, which wraps micron silicon particles in a thin Fe 3+ –polydopamine (PDA) layer with a thickness of 2–5 nm. The introduced Fe 3+ can form powerful metal-chelated bonds with PDA at appropriate hydrothermal temperature (160 °C). As a result, the mechanical strength of the protective layer is enhanced and the electrochemical activity of micron silicon is improved. Meanwhile, the 3D crosslinking structure formed through the esterification between the elastic polymer layer and polyacrylic acid (PAA) further guarantees the structural stability of anodes. Batteries using Si@Fe 3+ –PDA–160/PAA anode exhibit excellent cycling performance with stable capacity of 2000 mAh g −1 over 200 cycles at 0.5 C and high capacity retention ratio of 80% after 100 cycles at 0.1 C.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 18
·8931-8940
·
IF 5.8
Rusong Sang,Yezi Hu,Zewen Shen,Guixia Zhao,Junrong Yue,Xiubing Huang
In light of the widespread use of fossil fuels and the resulting environmental pollution, it is crucial to develop efficient photocatalysts for renewable energy applications that utilize visible light. Organic photocatalysts based on β-ketoenamine offer several advantages, including facile preparation, high stability, structural controllability, and excellent photovoltaic properties. However, in previous studies, the synthesis of porous organic polymers (POPs) often involved long, high-temperature processes. In this study, POPs with donor (D)–acceptor (A) structure were constructed by utilizing various branched bridging groups and 2,4,6-triformylphloroglucinol, across multiple temperature gradients. Through adjustments in hydrothermal temperature, we successfully synthesized a series of POPs with varying enol–keto structure ratios. Among these POPs, the dimethoxybenzidine-POPs (DMDPOPs) with methoxy electron-rich branched chains exhibited superior photovoltaic performance, electron transfer rate, and photocatalytic activity compared to the dihydroxybenzidine-POPs (DHDPOPs) with electron-deficient hydroxyl branched chains. Notably, DMDPOP-30 demonstrated outstanding performance, achieving a conversion rate of 98% within 3 h. Additionally, other POPs exhibited favorable conversions (90%), further confirming the feasibility of this synthetic approach. Moreover, the synthesis of DMDPOP-30 was achieved under mild conditions at room temperature, highlighting its significant potential for practical applications.
研究领域:
材料科学
·
化学工程
·
光化学
·
催化
✓ 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）