SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Qionghao Wang,Yaqi Peng,Min Chen,Mengxia Xu,Jiamin Ding,Qi Yao,Shengyong Lu
The process of urbanization has resulted in a continuous growth of the production of municipal solid waste , consequently leading to the increase of municipal solid waste incineration fly ash (MSWI FA) over time. This has prompted the need for effective disposal and value-added utilization strategies for MSWI FA. In this study, a hydrothermal method was employed to synthesize Ca Al layered double hydroxides (LDHs) using MSWI FA as the raw material. The main objective was to investigate how different synthesis parameters affect the crystallinity of the layered bimetallic hydroxides. Subsequently, the synthesized LDHs were characterized using various techniques such as BET, SEM , XRD, FT-IR, and XPS. The results revealed the presence of calcium and aluminum cations in the interlayer region of the synthesized material, with chloride ions, sulfate ions, and acetate ions being the predominant anions. Moreover, the formation of LDHs presents an effective approach for the self-purification of leachates derived from MSWI FA. The LDHs exhibited excellent adsorption capacity for Cd 2+ and Cu 2+ in wastewater, with maximum values of 730 mg·g −1 and 446 mg·g −1 , respectively. The adsorption mechanisms involved isomorphous substitution, complexation, as well as the precipitation of hydroxides or interlayer anions. This method presents a novel approach for effectively utilizing MSWI FA to produce environmentally friendly value-added adsorbents.
研究领域:
环境科学
·
废物管理
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材料科学
·
化学工程
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DOI
PubMed
高影响因子
AQUACULTURE RESEARCH
·
2023
·
IF 2
Tingting Hou,Zaizhao Wang,Kui Tang,Shuai Zhang,Shilin Liu,Jialiang Liu,Xiaoteng Fan,Xiaolin Liu
This study investigated the capability for fin regeneration in zebrafish larvae with the mechanism of FCS isolated from green and purple sea cucumbers Apostichopus japonicus (G-FCS and P-FCS). HPGPC determined that mean molecular weight of purified G-FCS and P-FCS is 19.5 and 18.8 kDa, and the FT-IR spectrum displayed similar characteristic absorption peaks. AFM images presented that G-FCS was shown as a spherical polysaccharide, while P-FCS molecules exhibited elongated chains. For the regeneration examination, FCS increased the regrowth area of the larval fin at 48 hours postamputation with enhanced locomotor behaviors, and the transcription levels of regeneration-related genes (Wnt10a, msx1b, fgf20a, bmp2a, bmp4, and igf2b) were upregulated. Moreover, FCS promoted the mRNA expression of inflammatory factors (iNOS, TNF-α, IL-6, IL-10, and IFN-γ) and TLR/NF-κB pathway-related genes (TLR3, TLR4a, NF-κb, and MyD88). The Western blot analyses of TNF-α and IL-1β supported that FCS enhanced immune response. ELISA results indicated that FCSs increased the contents of NO, CAT, SOD, and G6PD. Summarily, the present results suggested that FCS was a potential regeneration enhancer by elevating immunomodulatory and antioxidative processes in zebrafish.
研究领域:
海洋生物学
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发育生物学
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免疫学
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生物化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Shiyao Lu,Jian Zhang,Hao Meng,Xiaoyuan Qin,Jianbin Huang,Yehao Liang,Feng-Shou Xiao
Dehydration of methyl lactate (ML) obtained from biomass is a sustainable route for the production of methyl acrylate (MA). Herein, we demonstrate that cesium-exchanged Al-rich Beta zeolite (Cs-Beta) is highly efficient for the dehydration of ML to MA, exhibiting full ML conversion with 87.4% MA yield at 340 °C. In situ FT-IR spectra and kinetic studies provide evidence that the ML dehydration on the Cs-Beta zeolite follows a forward ion-exchange/dehydration/reverse ion-exchange reaction pathway. Model experiments, DFT calculations, TG-DSC analysis, and FT-IR spectra showed that coke formation competes with the dehydration of ML to MA. Kinetic studies and theoretical simulations demonstrate that cesium cations in the micropores of Beta zeolite have a strong steric hindrance, suppressing the formation of oligomers and coke. These results offer new insights for developing highly selective and stable catalysts for the dehydration of ML to MA in the future.
研究领域:
化学工程
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催化
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材料科学
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可持续化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 43
·16981-16989
·
IF 3.069
Bingying Jia,Miaojiang Wu,Hua Zhang,Yi Zeng,Gongying Wang
Titanates are frequently used as precursors to prepare transesterification catalysts with TiIV species. Unfortunately, it is challenging to control the dispersity of TiIV active sites on supports. Herein, a series of TiIV species is anchored on abundant linker vacancy sites by introducing point and large scale defects in UiO-66(Zr/Ti) with hierarchical-pore structure. The catalyst functionalized by titanium(IV) oxide bis(2,4-pentanedionate) shows excellent catalytic performance in the transesterification of dimethyl carbonate with phenyl acetate. The catalysts are characterized by XRD, FT-IR, N2 adsorption–desorption, XPS, SEM and STEM-HAADF techniques. The results demonstrate that the delicate mesopores in the support can not only exhibit a large surface area for the distribution of the active sites, but also provide better mass transfer performance. Meanwhile, the introduction of octahedral TiIV ions raises the activity of the catalyst via more coordinatively unsaturated ZrIV sites. Furthermore, using titanium(IV) oxide bis(2,4-pentanedionate) as a Ti source can effectively prevent the condensation of tetrahedral TiIV species anchored on the hierarchical-pore UiO-66(Zr/Ti) support.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Ting Hu,Qilin Huang,Kahing Wong,Hong Yang
Four polysaccharide fractions, LRP-1, LRP-2, LRP-3 and LRP-4 were extracted stepwise from Lignosus rhinocerotis sclerotia with distilled water at 25, 95, 120 °C and 1.0 M NaOH solution at 4 °C. Their structure, molecular size and chain conformation were clarified using SEC-MALLS-RI, GC, FT-IR and UV–vis. Furthermore, their immunomodulatory activities were evaluated by the model of cyclophosphamide (Cy)-induced immunosuppression. The LRP-1 and LRP-2 were polysaccharide-protein complexes (46–68% β- d -glucan and 27–48% protein), while LRP-3 and LRP-4 were absolutely composed of β- d -glucose. The LRP-4 with low polydispersity had much higher molecular weight ( M w , 5.86 × 10 6 g/mol) and intrinsic viscosity ([ η ], 202.6 ml/g) than other LRP fractions. Based on M w , radius of gyration ( z 1/2 ) and [ η ] data with the exponent β of z 1/2 –M w and its U-shaped curve, all four LRP fractions were highly branched macromolecules and LRP-3 showed a more compact sphere-like conformation than LRP-2 in aqueous solution. Additionally, all four LRP fractions exhibited protective effects against Cy-induced immunosuppression in mice by improving immune organs as well as stimulating the release of major cytokines TNF-α and INF-γ. This work provides a theoretical basis for the application of polysaccharides and their protein complexes from Lignosus rhinocerotis sclerotia in food- or drug-based therapies.
研究领域:
药理学
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免疫学
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生物化学
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真菌学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Zihao Cui,Qianqian Zhang,Hui Fu,Qihao Liu,Xiaolei Liu,Yaqiang Wu,Peng Gao,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang,Peng Wang
Herein, a facile anti-solvent preparation strategy is proposed to fabricate lead-free halide perovskite Cs 3 Bi 2 Br 9 with TiO 2 , which boosts photocatalytic activation of C(sp 3 )−H bonds in toluene oxidation . TiO 2 not only works as nucleation center to reduce the particle size of perovskite, but could form type II heterojunction with Cs 3 Bi 2 Br 9 , thus improving the photocatalytic performance of the TiO 2 /Cs 3 Bi 2 Br 9 composite. Under AM 1.5 G simulated sunlight irradiation, the optimal TiO 2 /Cs 3 Bi 2 Br 9 composite exhibits both high production rate (9692.5 μmol g −1 h −1 ) and selectivity (91 %) of benzaldehyde product. As verified by in-situ ESR, in-situ FT-IR and DFT calculations, •O 2 − and h + are demonstrated to be the main active species in this process. This work provides a new insight into the design of high-performance lead-free perovskite photocatalysts for organic synthesis.
研究领域:
材料科学
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光催化
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有机合成
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纳米技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ruihui Wu,Ronghao Liu,Xiaoxia Liu,Jianwei Zhang,Wenfeng Xue,Yanzhao Yang
The recovery of Nd(III) from NdFeB permanent magnets is gaining increasing attention. In the rare earth elements separation industry, wastewater produced through saponification has become a serious environmental problem. In this work, a novel non-saponification P350-N235 synergistic extraction system was established for the extraction of Nd(III) from nitric acid medium. Almost 100% of Nd(III) was extracted by using a P350-N235 system when the molar fraction (X) of P350 was 0.3. And the synergistic enhancement factor R max reached 60.03. Firstly, the effects of time, pH, volume ratio and other variables were investigated to determine the extraction behaviors. Response surface methodology (RSM) was used to optimize the extraction conditions. The mechanism of synergistic extraction was investigated by FT-IR, UV–vis, NMR methods and ESP maps, indicating that the composition of the extracted complex was Nd(NO 3 ) 3 ·(P350) 2.5 (N235) 2.5 . Then, the extraction thermodynamics and kinetics were also thoroughly investigated, the extraction process is demonstrated to be a spontaneously exothermic reaction. In the NdFeB leaching solution, the synergistic system showed excellent separation factor (β) for Nd/Sm (1.43), Nd/Gd (7.33), and Nd/Dy (9.81). Finally, after 5 cycles, the P350-N235 synergistic system maintained high extraction efficiency. In conclusion, this study overcame the saponification problem in traditional extraction techniques and proposed an environmentally friendly green extraction system.
研究领域:
环境科学
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化学工程
·
材料科学
·
稀土元素分离
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xu Liu,Peide An,Yide Han,Hao Meng,Xia Zhang
Cu-based nanozyme shows good oxidase-like activities due to the changeable states of Cu(II) and Cu(I), which are proven to be effective in the electron transfer in the redox process. Herein, the self-made MOF-818 with more Cu(II) loading was synthesized through a modified two-steps hydrothermal routes, which was then used as a sacrificial precursor to construct copper/zirconium composite oxides nanozymes (CN-MOF-818). The pyrolysis temperature was varied to obtain the best enzyme-like activities of the resulting CN-MOF-818. The laccase-like and catecholase-like activities were evaluated by using the oxidation of the mixture of 4-aminoantipyrine (4-AAP) and 2,4-dichlorophenol (2,4-DP), and 3,5-Di- tert -butylcatechol (3,5-DTBC) respectively. The enzyme-like activities were optimized through altering the catalytic conditions, and the corresponding enzyme catalytic kinetics including K m and V max were also determined. The enzyme-like mechanism of the CN-MOF-818 were also discussed based on EPR technique and the in-situ FT-IR analyses. In comparison with the pristine MOF-818 and the other reported Cu-based mimics, the as-prepared CN-MOF-818 exhibits the higher oxidase mimetic activities. These CN-MOF-818 can also be employed to detect the epinephrine with a low detection limit of 1.63 μM.
研究领域:
纳米技术
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催化
·
分析化学
·
生物化学
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产品关联
DOI
高影响因子
CHEMISTRY & BIODIVERSITY
·
2021
·Vol. 18
·期 3
·e2000864
·
IF 2.408
Yijia Qi,Weiming Ren,Haixia Zhang,Gang Chen,Weiyi Huang,Xuexia Li,Jie He,Weichun Zhao
Veronicastrum axillare polysaccharides (VAP) were isolated by cellulase-assisted digestion. The optimum conditions (2 % cellulase, 47 °C for 2.5 h, then, 95 °C for 2.5 h, pH 4.1, solid/liquid ratio 1 : 7.6) were identified by a combination of single factor optimization and response surface DOE (design of experiment) methods, and achieved a yield of 4.7 %. Treatment with 1 % TCA for 10 min, then, 2 % DEAE-cellulose removed protein and colored impurities. Purified VAP retained most of the radical-scavenging activities and GES-1 cell protection capability in vitro , indicating VAP were the key active components of V. axillare . Some molecular features were identified by FT-IR and NMR analyses. The molecular weight was estimated from DOSY NMR experiments to be around 21 kDa. There were 6.3 % uronic acid residues in the VAP. The constituent sugars after TFA hydrolysis were identified by HPLC to include glucose, arabinose, rhamnose, galactose, and xylose in a molar ratio of 405 : 259 : 82 : 42 : 1.
研究领域:
生药学
·
生物化学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2013
·
IF 5.825
Xing Tang,Huawei Chen,Lei Hu,Weiwei Hao,Yong Sun,Xianhai Zeng,Lu Lin,Shijie Liu
A series of low-cost readily-assembled eco-friendly metal hydroxides were examined as catalysts in the synthesis of a novel platform molecule, γ-valerolactone (GVL), from biomass-derived ethyl levulinate (EL) via hydrogen transfer reaction. Among these catalysts, ZrO(OH) 2 · x H 2 O was found to be most active. EL conversion of 93.6% and GVL selectivity of 94.5% were achieved when 2-propanol was used as a hydrogen donor at 473 K with a reaction time of only 1 h. The complete reaction pathway and the probable main by-products for the conversion of EL to GVL were clearly deduced for the first time. The ZrO(OH) 2 · x H 2 O catalyst could be reused at least ten times without any significant loss of catalytic activity. Furthermore, characterizations were carried out on the fresh and spent ZrO(OH) 2 · x H 2 O catalysts with XRD, FT-IR, BET, TGA-DTA. Combined with the results of poisoning experiments, a plausible mechanism for catalytic transfer hydrogenation (CTH) of EL to GVL was proposed to be consisted of a catalytic cycle involving a six member ring transition state.
研究领域:
化学工程
·
催化
·
绿色化学
·
可再生能源
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Liangyun Sun,Juan Han,Jiacong Wu,Wenrui Huang,Yuanyuan Li,Yanli Mao,Lei Wang,Yun Wang
The special molecular structure and properties of cellulose restrict its resource utilization. In this work, two kinds of common inorganic salt hydrates (ZnBr 2 ·RH 2 O and FeCl 3 ·RH 2 O) were used to pretreat microcrystalline cellulose (MCC) by magnetic stirring method at temperatures below 80 °C. It was found that while high temperatures could shorten the dissolution time of MCC, while inorganic salt hydrates with either low water (ZnBr 2 ·3.5H 2 O and FeCl 3 ·5H 2 O) or high water (ZnBr 2 ·5H 2 O and FeCl 3 ·8H 2 O) content can prolong the dissolution time of MCC. The reactivity of regenerated cellulose (RC) after dissolution was evaluated by enzyme hydrolysis reaction. Moreover, ZnBr 2 ·4H 2 O and FeCl 3 ·6H 2 O have better pretreatment effect. The structure and surface morphology of MCC before and after pretreatment were investigated by XRD , FT-IR, SEM , AFM and TGA. The MCC was converted from cellulose Ⅰ to cellulose II through the pretreatment. With the extension of dissolution time, the strength of hydrogen bond and thermal stability of RC were both slightly weakened, Moreover, the crystallinity and degree of polymerization (DP) of RC decreased, and the surface morphology of RC was more rougher, more uneven and dispersed compared with the smooth and compact MCC. The adsorption rate curves showed that RC-ZnBr 2 ·4H 2 O was more conducive to the adsorption of cellulase , thereby accelerating the rate of RC hydrolysis. Furthermore, ZnBr 2 ·4H 2 O is a well reusable pretreatment solvent that can maintain a good pretreatment effect on cellulose after five cycles.
研究领域:
化学工程
·
材料科学
·
生物材料
·
生物技术
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Cong Wang,Gang Li,Hongchen Guo
Compared with the mainstream approaches of doping the active metal in the MOFs structure and post-synthetic modification, it is more convenient to directly use the coordinatively unsaturated metal sites of MOFs for catalytic reactions. Herein, two forms of Ni-MIL-77 (1D Ni-MIL-77 and 3D MIL-77) were prepared using one-pot method and characterized by ICP-AES, XRD, FT-IR, XPS and SEM. Among them, 1D Ni-MIL-77 without high temperature heat treatment exhibited a better heterogeneous catalytic ethylene dimerization activity that was up to 989.6 g pro. /(g cat. ·h) (TOF=5544 h −1 ) and the selectivity of 1-butene could reach 93.3% at the optimal conditions. In addition, a probable Cossee-Arlman-like mechanism was proposed. By studying the catalyst structure after reaction, it was found that the reason for limited reuse was the hydrolysis products of the co-catalyst covered the catalysts.
研究领域:
催化
·
材料科学
·
化学工程
✓ 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）