ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 47
·71721-71730
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IF 5.19
Huang Wenjun,Li Sichao,Wang Hongbin,Cui Peng,Xu Haomiao,Cheng Can,Qu Zan,Yan Naiqiang
Oxidation–reduction-absorption based on sulfite is a promising process for simultaneous removal of NO x and SO 2 . However, excessive oxidation of sulfite and competitive absorption between NO x and SO 2 limit its application. A matching strategy between antioxidants and alkaline agents has been proposed to solve these problems and enhance the absorption process. The comparison results of inhibitors showed that hydroquinone exhibited long-term high-efficiency inhibition of S(IV) (SO 3 2- /HSO 3 - ) oxidation. The comparison of alkaline agents showed that the Na 2 SO 3 solution with heterogeneous mixture of MgO and hydroquinone exhibited better absorption performance than that with other combinations. The absorption amounts of NO x in 0.15 mol/L Na 2 SO 3 50 mL solution added 0.1% hydroquinone (HQ) with 0.09 mol/L MgO were 2.24 mmol, which improved 5 times than that without additives. In addition, studies on the influence of pH showed that the pH of MgO mixture could be stabilized at 9–10 for a long time, while the pH of Na 2 CO 3 mixture decreased faster. Further studies suggested that the hydration of MgO resulted in the solution with MgO keeping high pH. This is also the main reason why the combination of MgO and hydroquinone is superior to the combination of Na 2 CO 3 and hydroquinone in desulfurization and denitration performance.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Xinxing Wu,Zhiwei Fan,Shadrick Mwansa,Chen Huang,Qiang Yong
Exogenous ash penalties cause straw pulp residues to exhibit low autohydrolysis performance due to an organic–inorganic colloid medium. In this study, H 2 O 2 was applied following the soil organism to oxidize the organic components playing a role in the buffer system by increasing the negative charge on the surface of the particulate ash, thus reducing the acid buffer and cation exchange capacity of the pretreated wheat straw pulp residue (WSPR). The results showed that with the enzymatic efficiency increasing concentrations (0–3%) of H 2 O 2 , the enzymatic efficiencies of pretreated WSPR improved significantly with increasing H 2 O 2 concentration (0–3%) from 49.73 to 88.27%. A linear correlation was observed between these increases and the accessibility of the substrate to the enzymes, the substrate's surface charge, and the lignin's available surface area. The addition of 2% H 2 O 2 in WSPR autohydrolysis was able to increase the production of glucose and xylooligosaccharides by 1.58 and 2.38 times, respectively. This work demonstrated an innovative option for producing fermentable sugars from WSPR by effectively abolishing the self-buffering effects during autohydrolysis.
研究领域:
生物化学
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可再生资源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Guifang Wang,Chenhui Ding,Na Liu,Haiyan Liu,Jinlin Yang,Shaojian Ma,Chunlin He,Hongyuan Zhao
Complexant-montmorillonite nanocomposites were successfully prepared through the intercalation of the complexants cysteamine hydrochloride (CSH), 1,6-diaminlhexane (DA), tetraethylenepentamine (TEPA) with different functional group and molecular weight in this work. More importantly, it was proved that the heavy metal stabilization property of montmorillonite improved significantly after intercalation of complexants through characterization by XRD and SEM-EDS. Here, the complexant-montmorillonite nanocomposites exhibited strong pH buffering effects. The Zn stabilization rate was prone to 100% by adding DA or TEPA modified montmorillonite (DA-Mt or TEPA-Mt) into the tailings, and the releasing rate of As and Mn from tailings also decreased greatly. Generally, the Zn, Pb, Mn and As stabilization effects of both TEPA-Mt and DA-Mt were much better than that of CSH modified montmorillonite, which suggested that the heavy metal complexing abilities of complexant-montmorillonite nanocomposites highly depended on the functional group and molecular weight of the complexants. In this study, electrostatic adsorption, physical adsorption, ion exchange and complexation worked together and produced good heavy metal stabilization effect. Our findings could provide an important reference for the synthesis of efficient stabilization nanomaterials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2025
·
IF 26
Bangxin Li,Mingyue Yuan,Yihao Liu,Jinwen Zhang,Yuting Miao,Xuhui Xiong,Jiachen Sun,Renchao Che,Heyong He
Conventional non-noble hydrogen evolution reaction catalysts are plagued by excessive hydrogen adsorption and instability. To overcome this, we pioneer a high-entropy single-atom (HESA) catalyst via precise anchoring of multiple transition metals on carbon supports. The HESA catalyst achieves record-breaking alkaline HER performance of 44 mV@10 mA cm −2 (matching commercial Pt/C catalyst) and 300 h stability, resolving the persistent activity-stability trade-off. Systematical characterizations reveal that low-coordination metal sites induce significant metal-support charge redistribution. Electronegative supports withdraw electrons from metal centers, while π-back-donation downshifts metal d-band centers, optimizing the Gibbs free energy of intermediate H atoms (ΔG H* ). Atomic-scale imaging further confirms uniform charge distribution and Ångström-level electric field response. Crucially, adjacent multi-metal sites synergistically lower energy barriers for both water dissociation and hydrogen desorption through a synergistic electronic buffering effect. This work establishes entropy-driven microenvironment engineering as a paradigm for cooperative optimization of active sites and electronic structures, opening avenues for durable non-precious catalysts.
研究领域:
催化
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材料科学
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电化学
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能量转换
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Xudong Dong,Zhijie Zhu,Zhijie Chen,Zixuan Sun,Shuairen Qian,Zidi Wang,Yuxuan Zhou,Kaiqi Nie,Shuang Liu,Zimu Li,Mengqi Xiao,Jinpan Zhang,Binhang Yan,Yi Cheng,Chaoran Li,Xiaohong Zhang,Xingda An,Kai Feng,Zheng Hu,Le He
Solar methanol production represents a key technology meaningful for the production of liquid fuels as well as carbon neutralization. However, it is faced with the crucial challenge of limited reaction rate, selectivity, and stability. In this study, we develop a hierarchical carbon nanocage (hCNC)-supported In2O3 synergistic catalyst for robust methanol production driven solely by sunlight. hCNC plays a unique role as “electron buffers” for dynamic modulation of the oxygen vacancy (Ov) concentration in In2O3, addressing the long-standing challenge of Ov-induced destabilization. Notably, the photoenhanced electron buffering enables both electron transfer toward Ov-deficient In2O3, promoting Ov generation, and electron extraction from Ov-rich In2O3–x, preventing over-reduction. Consequently, both the high- and low-energy photons in the solar spectrum were harvested toward synergistic photothermal/photochemical catalysis, achieving a record-high methanol production rate of 4.6 mmol·gcat–1·h–1 with >51% selectivity. Our discovery of the photoenhanced electron buffering provides a perspective for dynamic modulation of nonthermal photocatalytic mechanisms; besides, the synergistic combination of photochemical and photothermal pathways also provides important guidelines for efficient solar methanol production.
研究领域:
催化
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材料科学
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可再生能源
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环境科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DRUG DELIVERY
·
2024
·
IF 6.5
Lu Bai,Xiaoqi Chen,Chengyu Li,Haijun Zhou,Yantao Li,Jijun Xiao,Fen Zhang,Hua Cheng,Mengmeng Zhou
Transmembrane transport remains a significant challenge for nucleic acid vaccine vectors. Promoting the ability of immune cells, such as macrophages, to capture foreign stimuli is also an effective approach to improving cross-presentation. In addition, polyethyleneimine (PEI) has gained attention in the field of nucleic acid vaccine carriers due to its excellent gene transfection efficiency and unique proton buffering effect. However, although high molecular weight PEI exhibits high efficiency, its high-density positive charges make it highly toxic, which limits its application. In this study, mannose/stearyl chloride functionalized polyethylenimine (SA-Man-PEI) was prepared by functionalizing PEI (molecular weight of 25 kDa) with mannose with immunomodulatory and phagocyte targeting effects, and an alkyl hydrophobic chain segment, which could easily promote cell uptake. Moreover, the functionalized-PEI retains a strong proton buffering effect, which helps the carrier escape from the lysosome. The particle sizes of the composite particles formed by SA-Man-PEI and ovalbumin (OVA) were below 200 nm, with good storage stability at both 4 °C and 37 °C. At a drug concentration of 2 μg/mL, the cell survival rate of functionalized-PEI was 19.2% higher than that of unfunctionalized PEI. In vitro macrophage endocytosis experiments showed that SA-Man-PEI could significantly enhance the macrophage uptake of composite particles, compared to unfunctionalized PEI or single-functionalized PEI. This study offers a new approach for developing PEI as a nucleic acid vaccine carrier, which could simultaneously enhance cell targeting and promote cell uptake.
研究领域:
药学
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免疫学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WEAR
·
2024
·
IF 5.3
Jiale Chen,Kefeng He,Jingjing Fei,Jinying Yu,Ziyue Meng,Yuying Pang,Lizhe Liang,Zhi Qun Tian
Lubricants can effectively solve the large amount of energy loss and environmental pollution caused by frictional wear. Graphene-based materials water-based lubricants have attracted attention due to their excellent various properties. But their application is still hindered by many obstacles. In this paper, a novel polycarboxylate superplasticizer modified 3D porous graphene/SiO 2 (PG/SiO 2 ) nanomaterial was prepared as water-based lubrication additives. The base fluid with good cooling properties was obtained by adding Kunlun full synthetic grinding/cutting fluid to deionized water and diluting it to 5% by weight. It is found that PG/SiO 2 had a good synergistic effect , which could effectively improve the extreme pressure performance (P B /P D ), with the maximum improvement rates of 39.7% and 86.3%, respectively. Meanwhile, significantly enhance the friction reduction (35%) and anti-wear (72.2%) properties of the base fluid. The enhancement mechanism was revealed by experimental and characterization analysis. Due to the excellent mechanical properties of graphene itself and synergistic effects including the rolling bearing effect of PG/SiO 2 and the buffering effect of SiO 2 in its intercalation, the PG/SiO 2 nanomaterials can significantly improve the extreme pressure performance of the base fluid. Further, theoretical calculations revealed the enhancement effects of the long chains of the polycarboxylate superplasticizer on the dispersibility and surface adsorption of graphene, and the modified graphene on the diffusive movement of water molecules.
研究领域:
材料科学
·
机械工程
·
化学工程
·
纳米技术
✓ 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）