Macroscopic Zn-doped a-Fe2O3/graphene aerogel mediated persulfate activation for heterogeneous catalytic degradation of sulfamonomethoxine wastewater

Shuying Dong,Xuanxuan Yan,Wenli Li,Yafei Liu,Xiaoxu Han,Xiaodan Liu,Jinglan Feng,Chongfei Yu,Chunyan Zhang,Jianhui Sun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-

In order to obtain a robust, durable and efficient heterogeneous catalyst, macroscopic monolithic Zndopeda-Fe2O3/graphene aerogel (GA) hybrid architecture with integrated morphology and hierarchicallyporous structure were controllably synthesized via a facile in-situ hydrothermal method and then used aspersulfate (PS) activator for sulfamonomethoxine (SMM) wastewater purification. Several key reactionparameters including the initial SMM concentration, reaction temperature, coexisting inorganic anionsand SMM in real natural water samples had different influence on the SMM removal efficiency. The catalyticefficiency of Zn-doped a-Fe2O3/GA with the molar ratio of Fe/Zn = 2:1.5 was about 66%, 62%, 66%and 11%33% higher than that of GA, a-Fe2O3/GA, Zn/GA and other Fe/Zn molar ratio. The improvedactivity of Fe/Zn = 2:1.5 benefits from the synergistic effects of the sp2 hybridized carbon and porousframework, as well as the surface oxygenic functional groups, which accelerate the pollutant/oxidant dispersionand electron transfer. Electron paramagnetic resonance results indicate that OH, 1O2 and SO4radicals account for the catalytic degradation of SMM and the activation of PS in present system is differentfrom conventional homogeneous systems, and speculate mechanism was proposed based on theobtained data.

Gelation Modification of Alginate Nonwoven Fabrics

Jie Liu,Yun Liu,Dagang Miao,Shuying Sui,Chuanjie Zhang,Ping Zhu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8

Calcium alginate nonwoven fabrics were gelation-modified by two-stage with aqueous HCl solution and then ethanolic NaOH solution. The structure and crystallinity properties of the samples were characterized by FT-IR, SEM, and XRD. The preparation conditions and modification mechanism were investigated. The results indicated that the crystal structure of calcium alginate fibers was destroyed; the crystallinity and calcium ion content decreased after HCl treatment. This resulted from the formation of ester bonds among the hydrolytic molecules after NaOH treatment. The best gel performance was obtained at the HCl concentration of 0.05-0.1 wt% with the NaOH concentration in ethanol of 2-4 mol/l. The liquid absorption of nonwoven alginate fabrics increased by 145 %. The water capability increased by 2673 % after modification, while the thickness, mass per unit area, permeability, and tensile strength of nonwoven alginate fabrics changed little.

Treatment performance and N2O emission in the UASB-A/O shortcut biological nitrogen removal system for landfill leachate at different salinity

Mu Liu,Yongzhen Peng,Qing Yang,Tiantian Liu, Han Xiao,Shuying Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-

Landfill leachate was treated using the upflow anaerobic sludge blanket (UASB) combined with anoxic/aerobic reactor (A/O) for shortcut biological nitrogen removal. The treatment performance and nitrousoxide (N2O) emission were studied under different salinity. When salinity increased from 10 to 35 g/L,the removal efficiency of ammonium nitrogen and total nitrogen decreased from 99.3 to 83.9% and from85.4 to 68.4%, respectively while the nitrite accumulation rate always remained high at more than 94.3%. The N2O conversion ratio increased by 14.7 times, from 0.3 to 4.7%. The concentration of biodegradableCOD in influent of the A/O reactor increased with the increase of salinity, which lead to the decrease ofdissolved oxygen and thus stimulated N2O emission remarkably during the aerobic zone. Meanwhile, theN2O emissions were likely to occur by a combination of pathways since the simultaneous nitritation anddenitritation was occurred in aerobic zone. The increase of NH4+-N concentration, NO2-N concentrationand pH caused by high salinity also promoted the N2O emission. The population of Nitrosomonaseuropaea increased with salinity, which was important for N2O emission.

The in-situ TEM isothermal aging evolution in a μ-Cu/NiAu/Sn/Cu solder joint for full intermetallic compounds interconnects of flexible electronics

Jinhong Liu,Xinyi Jing,Jieshi Chen,Kyung‑Wook Paik,Peng He,Shuye Zhang 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.3

A structure composed of various Cu–Ni–Sn IMCs would develop from severe Joule heat and excessive elemental diff usionunder high-density current in the solder joints of fl exible printed circuit (FPC). Herein, we fi rstly observed the evolution ofa Cu 6 Sn 5 + Cu 3 Sn/(Ni,Cu) 3 Sn 4 hybrid structure in a μ-Cu/NiAu/Sn/Cu solder joint for full intermetallic compounds (IMCs)interconnect of fl exible electronics under isothermal aging condition by in-situ TEM. The joint was divided into two regions,the IMC type on the right region remained unchanged with dwell time prolonging, while the ratio of Cu 3 Sn on the left regionat various dwell times fi tted the JMAK model when the kinetic parameter n picked 1.5, indicating that grain boundary diff usionwas the predominant mechanism for transporting Cu atoms. The nucleation and growth of Cu 3 Sn grains were fi nishedin the Cu 6 Sn 5 layer. The nucleation of a Cu 3 Sn grain with a spherical cap shape was fi rstly captured by HRTEM, and Cu 3 Sngrains underwent a transformation from columnar to equiaxed when the dwell time was increased, making the morphologyof Cu 3 Sn grains in a μ-Cu/NiAu/Sn/Cu solder joint signifi cantly diff erent from the situation in larger solder joints. This studyis expected to provide an in-depth study of the microstructural evolution of micro Cu/NiAu/Sn/Cu solder joints under agingcondition and thereby expand their application in the microelectronic industry.

Investigation of the Dynamic Characteristics of Muck during EPB Shield Tunnelling in a Full Chamber Model Using a CFD Method

Jiazheng Zhong,Shuying Wang,Pengfei Liu,Zhengri Liu,Tao Xu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9

For the safety and efficiency of earth pressure balance (EPB) shield tunnelling, the dynamic characteristics of the muck in the excavation chamber and the screw conveyor should be considered. However, the velocity and pressure distribution of the muck in the EPB shield, reflecting muck flowability and face stability, are rarely observed at the jobsite. Therefore, a computational fluid dynamics (CFD) model with a modified inlet boundary was established to investigate the muck characteristics in the chamber and the screw conveyor during tunnelling in a full chamber mode. A compressible Bingham model was adapted to describe the muck compressibility and rheology. The time-dependent tunnelling parameters obtained from the simulation excellently matched the field-measured data. The simulation results show the non-uniform velocity distribution of the muck at the excavation face and the low-velocity zones where clogging potentially occurs. The muck pressure reaches a peak at the excavation face and then decreases along the cutterhead openings, chamber and screw conveyor for inflow. The simulation also captures the pressure imbalance at the cutterhead and bulkhead, which may destabilize the excavation face. The proposed discharge efficiency is 56.7% in the simulated condition, indicating that tunnelling with these muck properties has no risk of muck spewing.

Study on Dynamic of Giant Magnetostrictive Material Transducer with Spring of Nonlinear Stiffness

He Li,Shuying Liu,Feng Wen,Bangchun Wen 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.6

Studies on Shoot Regeneration from Leaf Pieces of Rubus in Vitro

Yadong Li,Wei An,Shuying Liu,Zhidong Zhang,Lin Wu 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Stability criterion and its calculation for sail-assisted ship

Yihuai Hu,Juanjuan Tang,Shuye Xue,Shewen Liu 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.1

Stability criterion and its calculation are the crucial issue in the application of sail-assisted ship. However, there is at present no specific criterion and computational methods for the stability of sail-assisted ship. Based on the stability requirements for seagoing ships, the stability criterion of the sail-assisted ships is suggested in this paper. Furthermore, how to calculate the parameters and determine some specific coefficients for the ship stability calculation, as well as how to redraw stability curve are also discussed in this paper. Finally, to give an illustration, the proposed method is applied on a sail assisted-ship model with comments and recommendations for improvement.

The Effect of HPMC and CNC on the Structure and Properties of Alginate Fibers

Meiyu Ci,Jie Liu,Shenglong Shang,Zhiming Jiang,Ping Zhu,Shuying Sui 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10

Bio-composite alginate fibers with binary and ternary blends were prepared by using cellulose nanocrystal (CNC)and hydroxypropyl methylcellulose (HPMC) as composite fillers through wet-spinning method. Structural, thermal,mechanical properties and surface morphology of fibers were characterized by Fourier transform infrared spectroscopy (FTIR),X-ray diffraction (XRD), Thermogravimetric Analysis (TGA), Mechanical strength testing, Scanning ElectronMicroscopy (SEM). The thermal stability and mechanical performance of SA/HPMC and SA/HPMC/CNC composite fibersimproved as the increasing of crystallinity and intermolecular H-bonding interaction of the fibers. HPMC is helpful toimprove the extensibility and stiffness of alginate fibers, and CNC can further enhance the stiffness of SA/HPMC compositefibers. The tensile strength, elongation at break, the initial modulus and work at break of SA/HPMC/CNC composite fiberswere superior to those of alginate fibers. Roughness of surface and tensile section of SA/HPMC and SA/HPMC/CNCcomposite fibers got increased. Water absorbency and salt resistance were significantly improved.

Analysis of oligosaccharides from Panax ginseng by using solid-phase permethylation method combined with ultra-high-performance liquid chromatography-Q-Orbitrap/mass spectrometry

Li, Lele,Ma, Li,Guo, Yunlong,Liu, Wenlong,Wang, Yang,Liu, Shuying The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.6

Background: The reports about valuable oligosaccharides in ginseng are quite limited. There is an urgent need to develop a practical procedure to detect and analyze ginseng oligosaccharides. Methods: The oligosaccharide extracts from ginseng were permethylated by solid-phase methylation method and then were analyzed by ultra-high-performance liquid chromatography-Q-Orbitrap/MS. The sequence, linkage, and configuration information of oligosaccharides were determined by using accurate m/z value and tandem mass information. Several standard references were used to further confirm the identification. The oligosaccharide composition in white ginseng and red ginseng was compared using a multivariate statistical analysis method. Results: The nonreducing oligosaccharide erlose among 12 oligosaccharides identified was reported for the first time in ginseng. In the comparison of the oligosaccharide extracts from white ginseng and red ginseng, a clear separation was observed in the partial least squares-discriminate analysis score plot, indicating the sugar differences in these two kinds of ginseng samples. The glycans with variable importance in the projection value large than 1.0 were considered to contribute most to the classification. The contents of oligosaccharides in red ginseng were lower than those in white ginseng, and the contents of maltose, maltotriose, maltotetraose, maltopentaose, maltohexaose, maltoheptaose, maltooctaose, maltononaose, sucrose, and erlose decreased significantly (p < 0.05) in red ginseng. Conclusion: A solid-phase methylation method combined with liquid chromatography-tandem mass spectrometry was successfully applied to analyze the oligosaccharides in ginseng extracts, which provides the possibility for holistic evaluation of ginseng oligosaccharides. The comparison of oligosaccharide composition of white ginseng and red ginseng could help understand the differences in pharmacological activities between these two kinds of ginseng samples from the perspective of glycans.