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Enhanced adsorptive performance of tetracycline antibiotics on lanthanum modified diatomite
Guo-Ting Liang,Yanmin Feng,Weiyong Zhu,Xiwang Zhang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
A natural mineral diatomite was modified with lanthanum species using an ion exchange process to improve its adsorption performance for tetracycline removal. The prepared lanthanum-modified diatomite was characterized by scanning electron microscopy, X-ray diffractometry and Fourier transform infrared spectroscopy. The results showed that lanthanum was successfully immobilized onto diatomite, with a content of lanthanum element of about 1.5% (atomic ratio). The prepared adsorbent was evaluated for the adsorptive removal of tetracycline, and the adsorption isotherm, kinetics and mechanism were investigated. The adsorbent exhibited higher adsorption capacity than other adsorbents reported in literature, reaching 1056.9mmol/kg. Langmuir model better fitted the experimental data than did other models. The removal of tetracycline was favorable at near neutral pH conditions. The tetracycline adsorption well followed pseudo-second-order kinetics model, and most of tetracycline was adsorbed within the initial 15 min. The increase in ionic strength reduced the tetracycline adsorptive removal, indicating that tetracycline adsorption on La-modified diatomite may be attributed to the formation of out-sphere surface complexes.
Partial oxidation of polyvinyl alcohol using a commercially available DSA anode
Guo-Ting Liang,Weiyong Zhu,Xiaoqi Chai,Lingfeng Zhu,Xiwang Zhang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
The removal of polyvinyl alcohol (PVA) by electrochemical oxidation was investigated systematicallyunder various conditions using a commercial Dimensionally Stable Anodes anode. It was observed thathigher electrode potential led to more PVA degradation and gases evolution. Acidic conditions werebeneficial for PVA degradation. The higher degradation of PVA was achieved with KBr compared withother salts. The PVA degradation was slightly improved by ultraviolet irradiation while hydrogenperoxide lowered the degradation evidently. FTIR analysis indicated that PVA was partially oxidizedrather than completely mineralized. The iso-propanol quenching test indicated hydroxyl radicals weremainly responsible for PVA degradation.
Xi Wang,Hongxia Qiao,Yunsheng Zhang,Wenhua Zhang,Cuizhen Xue,Mubita Majory Mundia,Lei Zhang 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4
Concrete structure is easy to be damaged by corrosion in natural environment. In order to find a new way to improve the corrosion resistance of concrete. In this paper, the effect of Coal Tar Fuel (CTF) synergist on the corrosion resistance of concrete was analyzed by using MgSO4solution with concentration of 5% as corrosion medium. The change rule of concrete pore structure was studied. And the performance of concrete interfacial transition zone (ITZ) is studied. Finally, the effect of CTF synergist on hydration reaction of cementitious materials was revealed. The results show that the addition of 0.7% CTF synergist can significantly enhance the corrosion resistance of concrete, even with 10% reduction in cement dosage. After 28 days of being cured under this dosage, there is 13.54% increase in the proportion of pores with a diameter less than 100 μm and a 5.36% decrease in the proportion of pores with a diameter greater than 600 μm. Meanwhile, the microhardness of ITZ increases by 41.14%, while the width of ITZ decreases by 12.5%. Additionally, there is a reduction in the maximum crack width at the interface between ITZ and aggregate by 1.8 μm. The exothermic reaction of the cementitious material during hydration is more pronounced when the hydration time exceeds one hour.
Xi Wang,Miao-Wang Hao,Ke Dong,Fang Lin,Ji-Hong Ren,Hui-Zhong Zhang 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.9
Epigallocatechin-3-gallate (EGCG), the major component of green tea polyphenol, has potent efficiency to prevent the growth of a variety of cancer cells. As a novel anticancer agent for treatment of cancers, EGCG is promising and the mechanism has not been fully understood. Laryngeal squamous cell carcinoma (LSCC) is one common tumor in head and neck cancers. In the present study, we assess the effects of EGCG on LSCC cell line Hep-2, and their possible involvement in EGCG-induced apoptosis. The result showed that treatment of Hep-2 cells with EGCG decreased the cell viability, inhibited the growth and proliferation, induced apoptosis and increased the activity of caspase-3 in a dose-dependent manner. Furthermore, we found that EGCG-treatment repressed telomerase activity effectively in a concentrationdependent manner. The combined results show that EGCG induced apoptosis in Hep-2 cells via inhibiting the telomerase activity.