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One-pot hydrothermal synthesis of hierarchical porous manganese silicate microspheres as excellent Fenton-like catalysts for organic dyes degradation

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Nano Research 2022年第4期15卷 2977-2986页

作者： Yuyu Zheng Lihua Wang Liyun Zhang Heng Zhang Wancheng Zhu Department of Chemical Engineering Qufu Normal UniversityQufu 273165China

Towards bottlenecks demonstrated by typical Fenton-like catalysts in advanced oxidation processes(AOPs)for wastewater treatment,novel hierarchical porousMn^(2+)Mn_(6)^(3+)SiO_(12)(Mn_(7)SiO_(12),MSO-12)microspheres(specific surface area:434.90 m^(2)·g^(-1),pore volume:0.78 cm^(3)·g^(-1))were rationally designed and achieved via a simple one-pot hydrothermal method(150℃ and 12.0 h)without any pre-prepared templates or organic solvents,by using abundant MnCl_(2)·4H_(2)O and Na_(2)SiO_(3)·9H_(2)O as the basic raw *** MSO-12 microspheres are confirmed as high-efficiency Fenton-like catalysts for degradation of organic dyes(methylene blue(MeB),Rhodamine B(RhB),and methyl blue(MB))in the presence of H_(2)O_(2),with impressively high specific consumption amount of MeB(R=12.35 mg·g^(-1)·min^(-1))and extremely low leaching of Mn(Mnloss%=0.27%).Simultaneously,the synergetic effect of adsorption and degradation on the superior removal of MeB is *** excellent recycling performances,especially the satisfactory removal of MeB from the actual water bodies(e.g.,tap water and river water),as well as potential applications for degradation of RhB and MB enable the MSO-12 microspheres as a novel promising competitive candidate Fenton-like catalyst.

关键词： hierarchical porous manganese silicate microspheres Fenton-like catalysts degradation organic dyes

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CaCO_(3)-MnSiO_(x)hybrid particles to enable CO_(2)-mediated combinational tumor therapy

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Nano Research 2022年第9期15卷 8281-8290页

作者： Congkun Xie Tian Zhang Yike Fu Gaorong Han Xiang Li State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhouZhejiang 310027China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311200China

Nanocatalysts mediated reactive oxygen species(ROS)based therapy has been exploited as an alternative therapeutic modality of tumor with high specificity and minimal side ***,the treatment outcome is limited by the efficiency of local catalytic ***,we report a novel type of core–shell hybrid nanoparticles(CaCO_(3)@MS),consisting of CaCO_(3)and MnSiO_(x),for synergistic tumor inhibition combining enhanced catalytic effect and calcium *** this system,MnSiO_(x)serves as catalysts with glutathione(GSH)responsive Mn^(2+)ions release ***_(3)nanoparticles play three important roles,including carbon dioxide(CO_(2))donor,pH modulator,and Ca^(2+)overload *** is found that the CaCO_(3)nanoparticles can induce CO_(2)production and pH increase in acidic tumor environment,both of which promote Mn^(2+)mediated ROS *** simultaneous release of Ca^(2+)ions from CaCO_(3)triggers calcium overload in tumor,which functions collaboratively with excessive ROS to induce cancer cell *** results demonstrate that after treatment with CaCO_(3)@MS,a remarkable tumor inhibition was achieved both in vitro and in vivo,while no clear toxic effect was *** study has therefore provided a feasible effective approach to improve catalytic therapeutic efficacy by an“exogenous CO_(2)delivery”strategy for combinational tumor therapy.

关键词： nanocatalytic therapy manganese silicate carbon dioxide(CO_(2)) Ca^(2+)overload pH modulation

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