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Hao Wang,Jiangyue Dai,Huilun Chen,Fei Wang,Yangchen Zhu,Jia Liu,Beihai Zhou,Rongfang Yuan 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.2
In this study, Mg/Fe-doped biochar (MFDB) was prepared using the impregnation pyrolysis method, and its preparation was optimized using response surface methodology (RSM). The competitive adsorption between dissolved organic matter (DOM) and phosphorus was also investigated. The best adsorption capacity was obtained with an ㎎ impregnation ratio of 3.17:1 (Mg: biomass, g:g), Fe impregnation ratio of 1.3:1 (Fe: biomass, g:g), and pyrolysis temperature of 491℃. The adsorption capacity of MFDB for phosphorus was 179.21 ㎎/g at 40℃, an initial phosphate concentration of 50 ㎎/g and pH 4. The phosphate adsorption by MFDB conformed to a pseudo-primary and secondary adsorption kinetic model, proving the coexistence of physical and chemical adsorption. The adsorption mechanisms, including ligand exchange, electrostatic interaction, and complexation reaction were revealed. As the pH increased, it weakened the electrostatic interaction of phosphate by MFDB and the ligand exchange between phosphate and OH⁻. When the pH was less than 3, the metal oxide dissolved. For pH values exceeding, OH⁻ competed with phosphate for adsorptio, which also weakened the complexation of phosphate and MFDB. The DOM in domestic wastewater had a slight effect on the phosphorus adsorption. The phosphorus removal rates were closely related to lignin-like humic acid and tryptophan.
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New Hanger Design Approach of Tied-Arch Bridge to Enhance Its Robustness
Wenqing Wu,Hao Wang,Yan-Jie Zhu,Jiangyu Yu,Hao Zhao,Hui Zhang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.11
As the crucial components among the tied-arch bridge, the local failure of hangers may trigger a progressive collapse through the entire tied-arch bridge. However, the current design guidance as regards hangers still lacks consideration of structure robustness under an extreme hazard. To improve the structural robustness of tied-arch bridge under extreme conditions, a new hanger design method is proposed, which is termed as asymmetric parallel double-hanger system. Based on Miner’s linear cumulative damage law, an analysis on the fatigue life of the double-hanger system was conducted to verify the feasibility of the proposal, and then a dynamic time-history analysis was employed to simulate the transitory fracture impact due to one or more hangers fracturing. According to the simulation results, the structural robustness is greatly enhanced with asymmetric parallel-double hanger system design, when compared with single hanger system design. When one or more hangers reveal local damage, it will not trigger a progress failure to the whole structure in particular. Several practical suggestions of bridge system’s load-carrying capacity are also put forward for the future arch bridge design at the end of this paper.
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Xiaolei Ren,Jinwu Bai,Xingxing Gu,Hui Xu,Bochuan Tan,Shenying Xu,Jiangyu Hao,Fang Gao,Xin Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Imidazo-pyridazine and Bromo/Chloro-Imidazo-pyridazines are employed as the inhibitors for Al alloy in0.1 M HCl and 0.5 M HCl solutions. The electrochemical tests and adsorption model analysis revealed thatthree compounds are mixed-type inhibitors and Imidazo-pyridazine exhibited the best anti-corrosionperformance for Al electrode in HCl solutions by physicochemical. From electrochemical results, the bestanti-corrosion efficiency is 88.1 % for Al in 0.5MHCl with 2.0mMIP, while the efficiency is 75.5 % for Al in0.5 M HCl with 1.0 mM IP. The different inhibition behaviors result from the probability of the formationof AlCladsand N-onium ions. The formation of adsorption is due to the electrostatic attraction betweenAlCladsand N-onium ions. The surface topography test revealed that the Imidazo-pyridazine is the best corrosionbarrier for Al in 0.5 M HCl. The dynamic simulation demonstrated that the inhibition molecules andprotonated molecules can adsorb on the Al surface spontaneously with parallel adsorption configuration nomatter in more or less Cl- atmosphere.
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Bochuan Tan,Shengtao Zhang,Wenpo Li,Xiuli Zuo,Yujie Qiang,Lihui Xu,Jiangyu Hao,Shijin Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Phenyl disulfide (PDF), 2,20-dithiodipyridine (DDP), 5,5-dithiobis(1-phenyl-1H-tetrazole) (DPT) werestudied as inhibitors for Cu in H2SO4 via electrochemical methods, surface morphology analysis andtheoretical calculations. Electrochemical experiments show that PDF, DDP and DPT can exhibit excellentcorrosion inhibition performance. Their order of corrosion inhibition is DPT > DDP > PDF. Surfacemorphology analysis supports the electrochemical results. The X-ray photoelectron spectroscopy (XPS)results show that S Cu bonds are detected in PDF, DDP and DPT, and N Cu bonds are detected in DDPand DPT. PDF, DDP and DPT adsorption on the Cu surface obey the Langmuir isotherm model. The resultsof quantum chemical calculations show that DPT has more active reaction sites than DDP and PDF. Molecular dynamics simulation results show that the order of binding energies of the three corrosioninhibitor molecules on the copper surface is DPT > DDP > PDF.
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