Sb-Fe bimetallic non-aqueous phase desulfurizer for efficient absorption of hydrogen sulfide: A combined experimental and DFT study

Zhihao Liu,Kui Qiu,Yu Dong,Zhaobo Jin,Luwei Liu,Jirong Wu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12

A non-aqueous phase (Sb/Fe/NMP) desulfurization system for the removal of hydrogen sulfide from naturalgas was constructed by introducing SbCl3 and FeCl3 in a specific ratio into N-methylpyrrolidone (NMP). The desulfurizingagent and its sulfur product were characterized, and the absorption pattern of H2S by the system wasinvestigated by static desulfurization experiments. The results indicate that the desulfurizer’s sulfur capacity can reach16 g/L at room temperature and pressure, and that adding the optimum amount of water and appropriate temperatureincrease can assist to increase desulfurization efficiency. The system maintained a sulfur capacity level of more than90% of the initial sulfur capacity after five consecutive desulfurization-regeneration cycles. XRD and XPS spectrogramrevealed that the regenerated solid product was high purity sulfur. Sb3+ is a key component to ensure the effectiveabsorption of H2S. The presence of a moderate amount of Fe3+ can oxidize and absorb small amounts of H2S and promotethe oxidative regeneration of the system. In addition, we combined the obtained experimental data with densityflooding theory (DFT) theoretical calculations to show that the effective coordination of Sb(III) with HS in the NMPenvironment is the main reason for the effective absorption of H2S by the desulfurizer. NMP is not involved in thecoordination absorption process of hydrogen sulfide.

Fabrication of novel Fe2O3/MXene cathode for heterogeneous electro-Fenton degradation of sulfamethoxazole

Huilai Liu,Minshu Cui,Yao Liu,Defeng Kong,Zhihao Li,Rohan Weerasooriya,Xing Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-

Sulfamethoxazole (SMX) is a widely used antibiotic drug in medical applications resulting in its ubiquityin water and wastewater. Most of the treatment processes are inefficient in destroying SMX in water. Theheterogeneous electro-Fenton (EF)process shows promise in the non-selective degradation of antibioticdrugs in water and wastewater. Fe2O3/MXene-x (x is the ferric ion loading) was fabricated on 2DMXene carriers by hydrothermal method. The Fe2O3/MXene-x substrates were characterized by electronmicroscopic, X-ray, and molecular spectroscopic methods. Degradative products of SMX were identifiedby free radical quenching and LC-MS measurements. Electron micrographs show that Fe2O3 particulatesare uniformly distributed on MXene nanosheets. Fe2O3/MXene-x coated graphite was used as a cathodewith titanium anode for in situ generation of H2O2 required to produce free radicals (e.g. OH and O2 – ) todestroy SMX. Three possible SMX degradation routes by the electro-Fenton process were proposed. SMXand intermediates are eventually mineralized as CO2 and H2O. The new electrocatalyst shows reducedmetal ions leaching and good stability in repeated use cycles. This work offers a new electro-Fentonmethod to destroy antibiotic drugs in water and wastewater.

Fabrication and characterization of polypyrrole coatings by embedding antimony modified SnO2 nanoparticles

Zhihao Chen,Yijie Jin,Wenzhong Yang,Bin Xu,Yun Chen,Xiaoshuang Yin,Ying Liu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-

Polypyrrole (PPy) coatings were successfully electrosynthesized on the carbon steel by embedding SnO2and Sb-SnO2 nanoparticles (NPs). The associated structural, morphology, hydrophobic, physicalproperties, anti-corrosion and self-healing performance of these coatings were systematically studiedby several tests. XRD results showed that SnO2 had a tetragonal rutile structure and the lattice parametersindicated that Sb ions were successful substituted into SnO2 lattice. The average size of SnO2 NPs wasdecreased by the incorporation of Sb-SnO2 NPs, which were found through TEM images. The contactangle test showed that the hydrophobic of PPy coatings was greatly enhanced by the incorporation of Sb-SnO2 NPs. SEM results revealed that Sb-SnO2/PPy coating exhibited a more compact and uniform surfacethan SnO2/PPy coating, hence the physical barrier effect was significantly strengthened. Theelectrochemical measurements confirmed the excellent anti-corrosion and self-healing ability of Sb-SnO2/PPy coating for a long immersion time in HCl solution. The superior anti-corrosion performance ofSb-SnO2/PPy coating was ascribed to the synergistic effects of the anodic protection combined with theself-healing effect, the excellent physical barrier effect with compact, smooth and hydrophobic coatingsurface as well as the formation of p-n junction with decreased charge transfer.

Two-Dimensional Moving Blade Row Interactions in a Stratospheric Airship Contra-Rotating Open Propeller Configuration

Zhihao Tang,Peiqing Liu,Hao Guo,Jie Yan,Guangchao Li 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4

The numerical simulation of two-dimensional moving blade row interactions is conducted by CFD means to investigate the interactions between the front and rear propeller in a stratospheric airship contra-rotating open propeller configuration caused by different rotational speeds. The rotational speed is a main factor to affect the propeller Reynolds number which impact the aerodynamic performance of blade rows significantly. This effect works until the Reynolds number reaches a high enough value beyond which the coefficients become independent. Additionally, the interference on the blade row has been revealed by the investigation. The front blade row moves in the induced-velocity field generated by the rear blade row and the aerodynamic coefficients are influenced when the rear blade row has fast RPMs. The rear blade row moving behind the front one is affected directly by the wake and eddies generated by the front blade row. The aerodynamic coefficients reduce when the front blade row has slow RPMs while increase when the front blade row moves faster than itself. But overall, the interference on the front blade row due to the rear blade row is slight and the interference on the rear blade row due to the front blade row is much more significant.

ERRATUM

Liu, Shanshan,Guo, Zhihao,Wang, Yaqin,Yang, Tianbao,Wu, Liqiang Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.4

Anti-inflammatory, anti-oxidative stress effect of Phascolosoma esculenta oligosaccharides on Escherichia coli-induced sepsis mice

Zhihao Yang,Ying Pan,Jiong Chen,Hao Zhang,Hua Wei,Zufang Wu,Lianliang Liu 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.6

Bacterial infection is the most common cause ofsepsis. In this study, Phascolosoma esculenta oligosaccharides(PEOs) were prepared to evaluate their resistanceagainst E. coli-induced sepsis. HPLC–MS and FT-IRindicated that PEOs were composed of D-glucosyl, Dgalactosyl,with small amount of D-mannosyl, D-arabinosyland residues with a- and b-type linkage. Different dosageadministrations of PEOs for 30 days significantly improvedICR mice survival rate and bacterial clearance ability(P\0.01) after as E. coli injection. Moreover, PEOs significantlyreduced the secretion of IL-1b and TNF-a andenhanced that of IL-10 in sepsis mice, enhanced theantioxidant enzyme activities and total antioxidant capacity,decreased MDA level in the serum, and upregulatedmRNA expression of Nrf2 (P\0.01). All these resultsindicate that PEOs could improve the resistance of ICRmice against E. coli-induced sepsis that attributed to antiinflammatoryand anti-oxidative stress.

Analytical Models for the Electric Potential, Threshold Voltage and Drain Current of Long-channel Junctionless Double-gate Transistors

Zhihao Ding,Guang-Xi Hu,Ran Liu,Ling-Li Wang,Shuyan Hu,Xing Zhou 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8

Analytical models for the electric potential, threshold voltage and drain current of long-channel junctionless (JL) double-gate (DG) field-effect transistors (FET) are presented. A regional method is used to solve the Poisson equation under different gate biases, and the electric potential is obtained. With the potential model, an analytical expression for the threshold voltage is achieved. An expression for the drain current is derived from the potential model. The analytical results are compared with simulations, and excellent agreements are observed. The models accurately describe the characteristics of JLDG FETs, and they are very helpful for the design and optimization of devices.

Trichloroisocyanuric Acid as a Novel and Versatile Reagent for the Rapid α-Thiocyanation of Ketones

Liu, Shanshan,Guo, Zhihao,Wang, Yaqin,Wang, Tianbao,Wu, Liqiang Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.10

Harnessing the respiration machinery for high-yield production of chemicals in metabolically engineered <i>Lactococcus lactis</i>

Liu, Jianming,Wang, Zhihao,Kandasamy, Vijayalakshmi,Lee, Sang Yup,Solem, Christian,Jensen, Peter Ruhdal Elsevier 2017 Metabolic engineering Vol.44 No.-

<P><B>Abstract</B></P> <P>When modifying the metabolism of living organisms with the aim of achieving biosynthesis of useful compounds, it is essential to ensure that it is possible to achieve overall redox balance. We propose a generalized strategy for this, based on fine-tuning of respiration. The strategy was applied on metabolically engineered <I>Lactococcus lactis</I> strains to optimize the production of acetoin and (<I>R</I>,<I>R</I>)-2,3-butanediol (R-BDO). In the absence of an external electron acceptor, a surplus of two NADH per acetoin molecule is produced. We found that a fully activated respiration was able to efficiently regenerate NAD<SUP>+</SUP>, and a high titer of 371mM (32g/L) of acetoin was obtained with a yield of 82% of the theoretical maximum. Subsequently, we extended the metabolic pathway from acetoin to R-BDO by introducing the butanediol dehydrogenase gene from <I>Bacillus subtilis</I>. Since one mole of NADH is consumed when acetoin is converted into R-BDO per mole, only the excess of NADH needs to be oxidized via respiration. Either by fine-tuning the respiration capacity or by using a dual-phase fermentation approach involving a switch from fully respiratory to non-respiratory conditions, we obtained 361mM (32g/L) R-BDO with a yield of 81% or 365mM (33g/L) with a yield of 82%, respectively. These results demonstrate the great potential in using finely-tuned respiration machineries for bio-production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fine-tuning of the reducing power availability via respiration. </LI> <LI> Respiration capacity modulated through hemin concentration. </LI> <LI> High titer and yield production of acetoin by harnessing respiration. </LI> <LI> Production of (R,R)-2,3-butanediol by using a fine-tuned respiration. </LI> <LI> A dual phase fermentation approach developed for (R,R) 2,3-butanediol biosynthesis. </LI> </UL> </P>

Effect of Metallic GPF on the Micro Characteristics of Soot Particles of GDI Engine

Liu Cheng,Ma Zhihao,Yin Zhenlong,Du Weixin,Lv Enyu 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.6

High-resolution transmission electron microscopy (HRTEM) was used to observe the soot particles emitted from gasoline direct injection (GDI) engine equipped with metallic particulate filter (GPF). The changes of microscopic morphology and structure of the soot particles at pre-GPF and post-GPF were studied at a fixed speed of 1500 r/min and 25 %, 50 % 75 % and 100 % load, respectively. Furthermore, the micro-parameters of the primary particles that make up the soot particles were analyzed. The results show that the primary particles are approximately spherical, and agglomerate to form irregular shapes such as chains, branches and rings. The load and GPF have no significant influence on the microscopic morphology of the soot particles, the fractal dimension of soot particles at both ends of the GPF increases with the increase of load. Under the experimental conditions of the engine, most primary particles consisting of the soot particles are “shell-core” structure; The fringe length, tortuosity and interlayer spacing of the primary particles at pre- and post-GPF are monomodal. Among them, the average fringe length increases with the increase of load, while both the average tortuosity and average interlayer spacing change the opposite. These indicated that the degree of graphitization of the soot particle increases with the increasing load. Load and GPF only affect the micro-structure parameters of the primary particles and have no effect on its distribution.