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| 1 | Quantitative analysis of Pb adsorption on sulfhydryl-modified biochar显示文摘Biochar is an effective absorbent for remediating heavy metal contaminated soil,but functional optimization is still needed to improve its performance in field application.Here,we characterized the physical structures and surface chemical properties of raw wood biochar and palm biochar(WB and PB)and the corresponding sulfhydryl-modified biochar(SWB and SPB).Their adsorption capacity for Pb was evaluated by combining thermodynamic and kinetic adsorption at 0.01 mol/L KCl and corresponding model simulation.The results demonstrated successful grafting of sulfhydryl groups onto the biochar,which dramatically reduced the specific surface area(SSA)and pore volume of biochar.The pKa in the surface complexation model(SCM)indicated similar proton affinity between sulfhydryl groups and original functional groups on the biochar.SCM could satisfactorily fit the Pb adsorption behaviors,and model analysis revealed that Pb tended to be adsorbed on low-proton affin-ity sites at low pH,but high-proton affinity sites became dominant in Pb adsorption with increasing pH and adsorbed almost all Pb ions at pH>7.0.Besides,the Pb adsorption density of SWB and SPB was improved by 8.86 and 3.64 folds relative to that of WB and PB,respectively.Over 90% of initially added Pb ions were removed in 1440 and 720 min by raw and sulfhydryl-modified biochar,respectively,indicating that sulfhydryl modification accelerated the Pb adsorption of biochar.These results suggest that site density,SSA and pore structure of biochar play crucial roles in heavy metal adsorption,and sulfhydryl modification may improve the performance of biochar in remediating heavy metal contaminated soil. | Juan Xiong Mengge Zhou Chenchen Qu Daohai Yu Chang Chen Mingxia Wang Wenfeng Tan | 2021 | Biochar2021，3，1： | 5 |
| 2 | HMGB1 from Astrocytes Promotes EAE by Influencing the Immune Cell Infiltration-Associated Functions of BMECs in Mice显示文摘High mobility group box 1(HMGB1)has been reported to play an important role in experimental autoimmune encephalomyelitis(EAE).Astrocytes are important components of neurovascular units and tightly appose the endothelial cells of microvessels by their perivascular endfeet and directly regulate the functions of the blood-brain barrier.Astrocytes express more HMGB1 during EAE while the exact roles of astrocytic HMGB1 in EAE have not been well elucidated.Here,using conditional-knockout mice,we found that astrocytic HMGB1 depletion decreased morbidity,delayed the onset time,and reduced the disease score and demyelination of EAE.Meanwhile,there were fewer immune cells,especially pathogenic T cells infiltration in the central nervous system of astrocytic HMGB1 conditional-knockout EAE mice,accompanied by up-regulated expression of the tight-junction protein Claudin5 and down-regulated expression of the cell adhesion molecules ICAM1 and VCAM1 in vivo.In vitro,HMGB1 released from astrocytes decreased Claudin5 while increased ICAM1 and VCAM1 expressed by brain microvascular endothelial cells(BMECs)through TLR4 or RAGE.Taken together,our results demonstrate that HMGB1 derived from astrocytes aggravates EAE by directly influencing the immune cell infiltration-associated functions of BMECs. | Junyu Shi Yifan Xiao Na Zhang Mengya Jiao Xuhuan Tang Chan Dai Chenchen Wang Yong Xu Zheng Tan Feili Gong Fang Zheng | 2022 | Neuroscience Bulletin2022，38，11： | 3 |
| 3 | Three-dimensionally ordered macroporous(3DOM) structure promoted the activity and H_(2)O poisoning resistance of Ce Mn/3DOM-TiO_(2) catalyst in NH_(3)-SCR显示文摘NH_(3)-SCR is an effective mean of NOxremoval in the non-electric industry, however, the high activation temperature and poor H_(2)O resistance of SCR catalysts posed a barrier to its application. In this work, a series of three-dimensionally ordered macroporous(3DOM) catalysts were synthesized via a colloidal crystal template(CCT) method, and various characterizations were carried out to explore the physicochemical property of catalysts. The experiment results reveal that Ce_(0.2)Mn_(0.2)/3DOM-TiO_(2) catalyst presents the excellent low-temperature catalytic activity of nearly 100% at 100℃. Furthermore, the enhanced H_(2)O resistance is achieved, certified by the unaffected NO remove at 150℃ in the participation of 15 vol% H_(2)O. The characterizations results exhibit that the improved dispersion of the active component and enhanced redox ability are conducive to the low-temperature catalytic activity. N_(2) adsorption and desorption experiments indicate that catalyst with 3DOM support possesses a larger pore diameter and specific surface area, which may weaken the condensation of H_(2)O in the microporosity of catalysts and improved the H_(2)O resistance of the catalyst. In situ DRIFTS results manifest that Ce_(0.2)Mn_(0.2)/3DOM-TiO_(2) catalyst could not only absorb more NH_(3) and generate more surface-active sites, but inhibit the competitive adsorption between H_(2)O and SCR reactants. | Yaqin Hu Shipeng Ding Chenchen Tan Peng Wu Guobo Li Sheng Wang Hongqiang Yang Yaping Zhang | 2024 | Journal of Rare Earths2024，42，3： | 0 |
| 4 | Achieving high strength and ductility in Fe_(50)Mn_(25)Ni_(10)Cr_(15) medium entropy alloy via Al alloying显示文摘The microstructure and tensile properties of(Fe_(50)Mn_(25)Ni_(10)Cr_(15))_(100-x)Al_(x)(x=0-8 at.%)medium-entropy alloys(MEAs)were investigated.It was found that the crystalline structure changes from face-centered cubic(FCC)single phase to FCC+body-centered cubic(BCC)dual-phase with the increase of Al content.Therefore,the addition of Al elements with large atomic size could induce solid solution strengthening and dual-phase heterogeneous structure strengthening.Correspondingly,the present MEAs exhibit excellent combinations of yield strength,ultimate tensile strength(UTS)and ductility both at 298 and 77 K.Among the MEAs,the(Fe_(50)Mn_(25)Ni_(10)Cr_(15))_(95)Al_(5) alloy has a remarkable combination of cryogenic UTS(1077 MPa)and ductility(~85%),and has lower raw material costs than the reported high-entropy alloys(HEAs)and MEAs.The correlation among microstructure and mechanical properties and the corresponding strengthening mechanism were clarified. | Zhen Jiang Ran Wei Wenzhou Wang Mengjia Li Zhenhua Han Shuhan Yuan Kaisheng Zhang ChenChen Tan Wang Fushan Li | 2022 | Journal of Materials Science & Technology2022，，5： | 0 |
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