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| 1 | Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO_2 and Al_2O_3显示文摘Large quantities of CO_2 and blast furnace slag are discharged in the iron and steel industry. Mineral carbonation of blast furnace slag can offer substantial CO_2 emission reduction and comprehensive utilization of the solid waste.This paper describes a novel route for indirect mineral carbonation of titanium-bearing blast furnace(TBBF) slag,in which the TBBF slag is roasted with recyclable(NH_4)_2SO_4(AS) at low temperatures and converted into the sulphates of various valuable metals, including calcium, magnesium, aluminium and titanium. High value added Ti-and Al-rich products can be obtained through stepwise precipitation of the leaching solution from the roasted slag. The NH_3 produced during the roasting is used to capture CO_2 from flue gases. The NH_4HCO_3 and(NH_4)_2CO_3 thus obtained are used to carbonate the CaSO_4-containing leaching residue and MgSO_4-rich leaching solution, respectively. In this study, the process parameters and efficiency for the roasting, carbonation and Ti and Al recovery were investigated in detail. The results showed that the sulfation ratios of calcium,magnesium, titanium and aluminium reached 92.6%, 87% and 84.4%, respectively, after roasting at an AS-to-TBBF slag mass ratio of 2:1 and 350 °C for 2 h. The leaching solution was subjected to hydrolysis at 102 °C for 4 h with a Ti hydrolysis ratio of 95.7% and the purity of TiO_2 in the calcined hydrolysate reached 98 wt%.99.7% of aluminium in the Ti-depleted leaching solution was precipitated by using NH_3. The carbonation products of Ca and Mg were CaCO_3 and(NH_4)_2 Mg(CO_3)_2·4H_2O, respectively. The latter can be decomposed into MgCO_3 at 100–200 °C with simultaneous recovery of the NH_3 for reuse. In this process, approximately 82.1% of Ca and 84.2%of Mg in the TBBF slag were transformed into stable carbonates and the total CO_2 sequestration capacity per ton of TBBF slag reached up to 239.7 kg. The TiO_2 obtained can be used directly as an end product, while the Al-rich precipitate and the two carbonation products can act, respectively, as raw materials for electrolytic aluminium,cement and light magnesium carbonate production for the replacement of natural resources. | Lin Wang Weizao Liu Jingpeng Hu Qiang Liu Hairong Yue Bin Liang Guoquan Zhang Dongmei Luo Heping Xie Chun Li | 2018 | Chinese Journal of Chemical Engineering2018，26，3： | 14 |
| 2 | Engineering Cu^(+)/CeZrO_(x) interfaces to promote CO_(2) hydrogenation to methanol显示文摘Cu-based catalysts are widely employed for CO_(2) hydrogenation to methanol,which is expected as a promising process to achieving carbon neutrality.However,most Cu-based catalysts still suffer from low methanol yield with a passable CO_(2) conversion and lack insight into its reaction mechanism for guiding the design of catalysts.In this work,Cu^(+)/CeZrO_(x) interfaces are engineered by employing a series of ceria-zirconia solid solution catalysts with various Ce/Zr ratios,forming a Cu^(+)-O_(v)-Ce^(3+)structure where Cu^(+)atoms are bonded to the oxygen vacancies(O_(v))of ceria.Compared to Cu/CeO_(2) and Cu/ZrO_(2),the optimized catalyst(i.e.,Cu_(0.3)Ce_(0.3)Zr_(0.7))exhibits a much higher mass-specific methanol formation rate(192g_(MeOH)/kg_(cat)/h)at 240℃and 3 MPa.Through a series of in-situ and ex-situ characterization,it is revealed that oxygen vacancies in solid solutions can effectively assist the activation of CO_(2) and tune the electronic state of copper to promote the formation of Cu^(+)/CeZrO_(x) interfaces,which stabilizes the key*CO intermediate,inhibits its desorption and facilitates its further hydrogenation to methanol via the reverse watergas-shift(RWGS)+CO-Hydro pathway.Therefore,the concentration of*CO or the apparent Cu^(+)/(Cu^(+)+Cu^(0))ratio could be employed as a quantitative descriptor of the methanol formation rate.This work is expected to give a deep insight into the mechanism of metal/support interfaces in CO_(2) hydrogenation to methanol,offering an effective strategy to develop new catalysts with high performance. | Jingpeng Zhang Xiaohang Sun Congyi Wu Wenquan Hang Xu Hu Dawei Qiao Binhang Yan | 2023 | Journal of Energy Chemistry2023，，2： | 3 |
| 3 | Structures of SdrD from Staphylococcus aureus reveal the molecular mechanism of how the cell surface receptors recognize their ligands显示文摘Staphylococcus aureus is the most important Gram-positive colonizer of human skin and nasal passage,causing high morbidity and mortality.SD-repeat containing protein D(SdrD),an MSCRAMM(Microbial Surface Components Recognizing Adhesive Matrix Molecules)family surface protein,plays an important role in S.aureus adhesion and pathogenesis,while its binding target and molecular mechanism remain largely unknown.Here we solved the crystal structures of SdrD N2-N3 domain and N2-N3-B1 domain.Through structural analysis and comparisons,we characterized the ligand binding site of SdrD,and proposed a featured sequence motif of its potential ligands.In addition,the structures revealed for the first time the interactions between B1 domain and N2-N3 domain among B domain-containing MSCRAMMs.Our results may help in understanding the roles SdrD plays in S.aureus adhesion and shed light on the development of novel antibiotics. | Xiao Wang Jingpeng Ge Bao Liu Yulin Hu Maojun Yang | 2013 | Protein & Cell2013，4，4： | 3 |
| 4 | CDK1、CDK2 siRNA干扰对肿瘤细胞凋亡和细胞周期的影响(英文)显示文摘Objective:We investigated the influence of CDK1 and CDK2 expression inhibited by cotransfection of CDK1 and CDK2 siRNA on cell cycle and apoptosis,explored the exact role of cell cycle master regulator in tumor cell apoptosis process.Methods:The siRNA targeting the CDK1 and CDK2 genes were synthesized and simultaneously cotransfected into Hela cells by lipofectamine 2000.48 or 60 h after the cotransfection,CDK1 and CDK2 protein expressions were examined by Western blot.Cell cycle distribution was analyzed by flow cytometry.Cell apoptosis was detected by the Annexin V/PI method.The changes of the transfected cell morphological under a microscope after Wright-Giemsa Staining were studied.Results:CDK1 and CDK2 protein expression was decreased at 48 or 60 h after cotransfection.The accumulation of the G2/M and S phase population in cell cycle of the cotransfected cells at 48 or 60 h after transfection was enhanced obviously compared with control.The ratio of apoptotic cell of cotransfected cells at 48 or 60 h after transfection was increased significantly compared with control.More binucleate or multinucleate cells among cotransfected cells were observed under the microscope.Conclusion:The decreased expression of CDK1 and CDK2 by cotransfection of CDK1 and CDK2 siRNA not only leads to tumor cell cycle arrest in S phase and G2/M phase,but also induces tumor cell apoptosis. | Hui Xiao Wanjun Gong Jingpeng Cao Xiaolan Li Deding Tao Junbo Hu Jianping Gong | 2009 | The Chinese-German Journal of Clinical Oncology2009，8，7： | 1 |
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