AIP Advances
·
2021
·Vol. 11
·期 11
·
IF 1.548
Huang Lijie,Wei Zhehao,Wang Yanan,Han Xiaoxue,Chen Haobin,Huang Chongxing,Wei Yingnan
In this paper, the effect of D 0 temperature, Kappa factor and the final pH value on bleaching sulfate bleached pine wood pulp was studied. The results showed that the bleaching efficiency was better when the pH value was 4, and the amount of absorbable organic halogen (AOX) in the bleaching wastewater was decreased. The Kappa factor is linear with the whiteness in the range of 0–0.15. With the increase of the Kappa factor, the amount of AOX in bleaching wastewater of D 0 and Ep gradually increases. High temperature bleaching can reduce AOX production, but some fibers are hydrolyzed, leading to a decrease in pulp viscosity. The effects of chlorine dioxide solution adding sodium dihydrogen phosphate (NaH 2 PO 4 ) and dimethylsulfoxide (DMSO) on pulp bleaching were investigated. The results showed that both solutions could reduce the amount of AOX in bleaching wastewater. Among them, the addition of NaH 2 PO 4 in chlorine dioxide increased pulp whiteness, while the addition of DMSO was the opposite. Scanning electron microscope showed that a small amount of hollow cracks and more voids appeared on the surface of pulp fibers after the addition of NaH 2 PO 4 . Pulp fibers bleached by the chlorine dioxide adding DMSO have more folds and less voids on the surface. The surface wrinkles of pulp fibers increased with the addition of DMSO and the voids were less. FT-IR showed that the number of chromophore groups in the pulp bleached by chlorine dioxide adding NaH 2 PO 4 were decreased. However, the lignin characteristic absorption peak in the pulp bleached by chlorine dioxide adding DMSO increased at the intensity of 1062 and 1160 cm −1 , which indicated that there were more residual chromophore groups.
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高影响因子
LANGMUIR
·
2021
·
IF 3.882
Peng Wang,Fengtao Zhang,Cailing Wu,Jianji Wang,Buxing Han,Zhimin Liu
Herein, we report CoCO3-coated nitrogen-doped carbon nanotubes (NCNTs) with a sea cucumber-like morphology for water splitting. The sample with a CoCO3 content of 26.8 wt % (CoCO3/NCNT-1) exhibits excellent performance for the hydrogen evolution reaction in 1.0 M KOH electrolyte with an overpotential of 58 mV to reach 10 mA cm–2, better than the most non-noble metal catalysts reported; meanwhile, it exhibits superior electrocatalytic activity for the oxygen evolution reaction. The excellent performance of the catalyst is attributed to the nanotip effect caused by the sea-cucumber-like morphology. Notably, CoCO3/NCNT-1 can attain turnover frequencies of 2.7 s–1 at an overpotential of 50 mV, higher than that of Pt/C (1.5 s–1). A cell constructed using CoCO3/NCNT-1 as the catalyst of the electrode pair needs a low cell voltage of 1.54 V at 10 mA cm–2, superior to most reported cells. In addition, CoCO3/NCNT-1 can maintain 10 mA cm–2 for overall water splitting for 100 h without activity loss.
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高影响因子
PEST MANAGEMENT SCIENCE
·
2023
·Vol. 80
·期 4
·2120-2130
·
IF 4.1
Ximing Zhong,Guofeng Su,Li Hao,Huayao Chen,Chao Li,Hua Xu,Hongjun Zhou,Xinhua Zhou
BACKGROUND Root-knot nematodes (RKNs) are the highly damaging pests for various crops, and the prevalence of RKNs has posed serious threats to worldwide agricultural harvest, severely affecting global food security and ecosystem health. Traditional pesticide systems on controlling RKNs generally cause environmental hazards and phytotoxicity due to the excessive use of pesticides resulted from low utilization efficiency. And effective approaches with biosafe and efficient features are highly demanded to break away from the dilemma caused by RKNs. RESULTS In this research, a nanopesticide system with root-targeted delivery function was developed to achieve effective prevention and control of RKNs. The nanocarriers (MSN-KH560-Gly) and the obtained nanopesticides (EB@MSN-KH560-Gly) were proved to be biosafe. Also, this nanopesticide system demonstrated sustained release behavior. The grafting of glycine (Gly) significantly improved the pesticide contents translocating to cucumber roots (about 304.7%). Besides, such root-targeted delivery function resulted in no root nodule in cucumber plants after the foliar application of these nanopesticides (prevention rate of 100%). In addition, the root nodule numbers of the infected cucumber plants decreased by 71.67%. CONCLUSION Foliar application of these Gly-functionalized nanopesticides achieved effective prevention and control of RKNs due to the root-targeted delivery property inherent in this nanopesticide system, and such root-targeted delivery strategy opens a novel and efficient method to protect crops from RKN invasion and thus facilitates the development of sustainable agriculture. © 2023 Society of Chemical Industry.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Yunlei Zhang,Bing Li,Yanan Wei,Changhao Yan,Minjia Meng,Yongsheng Yan
Developing a green and economically viable approach for the direct synthesis of metal-organic frameworks (MOFs) catalysts with multifunctional active sites remains the key step for their applications in heterogeneous catalysis field. Herein, we report a green (aqueous solutions), mild (90 °C, atmospheric pressure), and modulated hydrothermal (MHT) approach to synthesize UiO-66-type MOFs catalysts with acid–base bi-functional sites, which were obtained via the coordination of monosodium 2-sulfoterephthalate and 2-aminoterephthalic with zirconium (Zr) ions. More importantly, a series of acid, base and acid–base catalysts with varied acid–base strengths can be readily prepared, by simply varying the ratio of organic ligands for preparing MOFs. The synthesized catalysts were characterized and their performances in glucose dehydration to produce 5-hydroxymethylfurfural (5-HMF) have been evaluated. The developed approach in this work has clearly depicted a roadmap for the facile synthesis of MOFs catalysts to facilitate their potential use in acid–base catalysis.
研究领域:
化学工程
·
催化科学
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Polymers
·
2023
·Vol. 15
·期 23
·4505
·
IF 5
Jiao Tan,Yinchun Liang,Lihui Sun,Zhanping Yang,Jingjing Xu,Dejun Dong,Huan Liu
Cellulose acetate (CA) is widely used in cigarette filters and packaging films, but due to its acetylation, it is difficult to degrade in the natural environment, and the problem of pollution has become a serious challenge. Understanding the degradation behavior and performance of CA in different environments is the basis and prerequisite for achieving its comprehensive utilization and developing efficient degradation methods. In this study, we investigated the degradation performance of CA in different aqueous environments to evaluate the effects of pH, salinity and microorganisms on CA degradation. The CA tows and films were immersed in HCl, NaOH solution, river water, seawater or homemade seawater for 16 weeks and the degradation mechanism was investigated by the changes in weight loss rate, degree of substitution, hydrophilicity, molecular structure and surface morphology. The results showed that the degradation of CA tow and film were the fastest in NaOH solution; the weight loss rates after 16 weeks were 40.29% and 39.63%, respectively, followed by HCl solution, and the degradation performance of CA tow was better than that of film. After 16 weeks of degradation in river water, seawater and homemade seawater, all the weight loss rates were less than 3%. In summary, this study illustrated that the environmental acidity, basicity and high concentration of inorganic salts had a critical promotion effect on the non-enzymatic hydrolysis of CA, whereas the number and type of microorganisms were the key factors affecting the biodegradation of CA.Keywords:cellulose acetate;different aqueous conditions;degradation
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高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Chengde Liu,Pengxin Mei,Xitong Cheng,Cheng Liu,Nan Li,Xigao Jian
Improving the interfacial adhesion of carbon fiber (CF)/polymer composite is an urgent demand to enhance its mechanical properties. A kind of poly(aryl ether ketone) with carboxyl groups (PAEK-COOH) was newly synthesized. PAEK-COOH is similar to the thermal properties of PPEK matrix. Hydroxyapatite (HAp) was easily dispersed in an NMP solution containing PAEK-COOH. Different kinds of hybrid sizing agents were obtained for preparing the prepreg through the solution impregnation. The hot-pressing method was employed to produce the laminated composites. Flexural strength, flexural modulus and interlamellar shear strength (ILSS) of 0HP@CF/PPEK composites were improved by 8.8%, 17.3%, and 14.7%, respectively, in comparison to desized CF/PPEK. The interface bonding between CF and PPEK was improved by the addition of PAEK-COOH sizing agent. Meanwhile, compared with desized CF/PPEK laminates, flexural strength, flexural modulus and ILSS of 5HP@CF/PPEK composites were enhanced by 63.5%, 87.4%, and 40.9%, respectively. The crack propagation path became dispersed and the stress was effectively absorbed when the sizing agent containing nano-hydroxyapatite particles. By characterizing and reconstructing the transverse and longitudinal fracture in composite materials, the failure process of the composites under the action of stress was explained, and the interface theories of CF reinforced polymer were further explored. Highlights A kind of polyaryl ether ketone containing carboxyl functional group (PAEK-COOH)was newly synthesized. HAp was distributed in the polymer sizing agent to obtain a HAp/PAEK-COOH hybrid sizing agent. The interfacial adhesion of CF/PPEK composite was greatly improved by the hybrid sizing agent.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Bin Li,Shuai Liu,Hengxi Zhu,Wenmin Qian,Pan Wang,Ruihao Yang,Jin Zhang,Qihong Cen,Zewei Liu,Ping Ning
The environmental problem caused by industrial emissions of NO x has been studied in the past dacades. In this study, red mud coupling with phosphorus sludge were used to enhance the solution to absorb NO x from the flue gas . Firstly, red mud reacted with the binder silicic acid in the phosphorus sludge, destroying the emulsion structure of the phosphorus sludge. Then, the P 4 in the phosphorus sludge is completely released, and the P 4 reacted with O 2 in the flue gas to produce O 3 and O. NO and NO 2 contained in the flue gas reacted with the active O and O 3 to produce high-valent NO x , such as NO 3 , N 2 O 5 . At last, the mixed slurry of red mud and phosphorus sludge absorbed the high-valent NO x , resulting in the formation of Ca 5 (PO 4 ) 3 F along with HNO 3 . Using phosphorus sludge to produce O 3 in the reaction process can reduce the production cost of O 3 and achieve waste utilization. Meanwhile, the interaction between red mud and phosphorus sludge can promote phosphorus sludge to produce O 3 and remove F - from phosphorus sludge, as well as avoid the problem of secondary pollution. This study should be helpful for red mud and phosphorus sludge utilization and flue gas denitration.
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高影响因子
Nutrients
·
2023
·Vol. 15
·期 20
·4364
·
IF 5.9
Buyu Liu,Zhiguo Zhang,Xingquan Liu,Weiwei Hu,Weicheng Wu
To investigate the role of gastrointestinal (GI) polysaccharide fermentation in alleviating constipation, two polysaccharide fractions were isolated from a soluble fiber extract with determined anti-constipation activity: a 2.04 kDa neutral fraction (SSP-1) contained 99.29% glucose, and a 41.66 kDa acidic fraction (SSP-2) contained 63.85% uronic acid. After mice were given loperamide for 14 d to induce constipation, the GI transit rate increased significantly in the SSP-1 group (p< 0.05) but not in the SSP-2 group. The stool weight in the SSP-2 group was significantly higher than that in SSP-1 (383.60 mg vs. 226.23 mg) (p< 0.05). Both SSP-1 and SSP-2 groups had significantly increased serum gastrin and motilin levels (p< 0.05) and changes in their fecal short-chain fatty acid (SCFA) profiles, while SSP-1 showed better fermentation properties than SSP-2 in terms of statistically higher fecal contents of acetic acid and total SCFAs (p< 0.05). Bioinformatic analysis indicated that SSP-1 upregulated bacteria such asOscillibacterto improve SCFA metabolism and stimulate GI hormone secretion, while SSP-2 had less influence on the gut microbiota. These results suggest that the neutral polysaccharide with superior GI fermentation properties exerted beneficial effects on constipation, while the less fermentable pectic fraction might act as a stool-bulking agent.Keywords:sweet potato;polysaccharide;constipation;short-chain fatty acids (SCFAs);gut microbiota;fermentation
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高影响因子
Small
·
2023
·Vol. 20
·期 11
·2308875
·
IF 13.3
Yao An,Zhaoxiang Yang,Yongjia Yang,Xinlei Li,Xinjia Zheng,Zhiwu Chen,Xun Wu,Beihang Xu,Yapei Wang,Yonglin He
As a new approach to “More than Moore”, integrated ionic circuits serve as a possible alternative to traditional electronic circuits, yet the integrated ionic circuit composed of functional ionic elements and ionic connections is still challenging. Herein, a stretchable and transparent ionic display module of the integrated ionic circuit has been successfully prepared and demonstrated by pixelating a proton-responsive hydrogel. It is programmed to excite the hydrogel color change by a Faraday process occurring at the electrode at the specific pixel points, which enables the display of digital information and even color information. Importantly, the display module exhibits stable performance under strong magnetic field conditions (1.7 T). The transparent and stretchable nature of such ionic modules also allows them to be utilized in a broad range of scenarios, which paves the way for integrated ionic circuits.
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高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Zijian Liang,Pangzhen Zhang,Wen Ma,Xin-An Zeng,Zhongxiang Fang
A new type of flavored wine was produced by macerating either green tea or black tea into Chardonnay wine and model wine respectively, where the physicochemical properties (pH, titratable acidity, color) were modulated. Significant ( p < 0.05) increases of total phenolic content and antioxidant activity (assessed by DPPH, FRAP and ABTS assays) were also observed in the tea macerated wines. A total of 160 phenolic and non-phenolic compounds were identified by HPLC-DAD-ESI-QTOF-MS/MS, where 55 phenolics were newly found in the tea macerated Chardonnay wine. The interaction between wine and tea phenolics led to additional 29 phenolic compounds and 4 non-phenolic compounds that were not found in either Chardonnay wine or tea. Catechin and epigallocatechin gallate were the most abundant phenolic compounds and contributed to the improved antioxidant activities. This study provided a promising prospect of tea as a novel additive in the production of flavored wine with enhanced functionalities.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Jing Zhang,Xingjie Shang,Ying Zhu,Xuan Yang,Shu Wang,Feixiang Gong,Lei Wang,Hongpeng Ma
To explore the intrinsic correlation between the rigidity and distortion degree of polymer backbones and the diffusion dialysis (DD) performance of anion exchange membranes (AEMs), pyrrolidinium-functionalized poly(arylene ether sulfone)s containing different Cardo (TPM) moieties were prepared. The structures, properties and DD performance of above AEMs were systematically evaluated. As the Cardo (TPM) group angle increased, the d-spacing, fractional free volume, and membrane area resistance increased, and the microphase separation structures, hydrophilicity, and acid flux decreased, mainly because larger Cardo (TPM) group angles are unfavourable for the close packing of polymer chains in space. Both the Cardo-type and TPM-type AEMs exhibited universal ultrahigh H + /Fe 2+ selectivity (S > 3819), which was mainly attributed to the synergistic influence of their rigid narrow ion transport channels, small pore diameter (0.48–0.62 nm) and narrow pore size distribution (0.24–0.68 Å). Additionally, due to the high-density amide groups of TPM units, which decreased the hydrophobicity of the polymer skeleton and induced the formation of an additional transport pathway for Fe 2+ through hydrogen bonding interactions, the TPM-type AEMs showed both lower acid flux and selectivity, suggesting that the structure of hydrophilic auxiliary groups should be carefully designed when improving the DD performance of AEMs.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Chenyang Zheng,Na Xie,Xin Liu,Lianqin Wang,Weikang Zhu,Yabiao Pei,Runfei Yue,Haotian Liu,Shuoyao Yin,Jie Yao,Junfeng Zhang,Yan Yin,Michael D. Guiver
Proton exchange membranes (PEMs) with remarkable chemical stability are desirable to realize long lifetimes of proton exchange membrane fuel cells (PEMFCs). In our recent work, PEMs containing radical scavenger ferrocyanide (Fc (II))/ferricyanide (Fc (III)) species were demonstrated to possess outstanding chemical stability. However, a challenge in balancing general applicability and retention remains, due to their water solubility. Here, Fc (II) is tethered to a SiO 2 support to produce low water soluble SiO 2 -Fc (II), which could be used as a universal additive in various matrices to mitigate leaching. The composite PEMs, sulfonated polysulfone (SPSf) doped with SiO 2 -Fc, show much higher oxidative stability, confirmed by Fenton's test, ion exchange capacity retention and proton conductivity retention. The composite PEM also displays obviously improved durability during PEMFC operation, where the antioxidative efficacy of SiO 2 -Fc is evidently stronger than comparative stand-alone water-soluble species. Moreover, a PEMFC based on SPSf composite PEM shows much higher power output than that based on unfilled SPSf membrane under low humidity conditions, owing to the hydrophilicity and proton conductivity of SiO 2 -Fc. The present work outlines a prospective route to better utilize Fc (II)/Fc (III) antioxidant with clear benefits in general applicability and good stability, leading to progress in utilization.
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危险品化学品经营许可证（带存储）