Nowadays, chemical catalytic methods for the treatment of organic wastes are attracting more and more research attention. In the current research, novel catalysts with palladium nanoparticles (Pd NPs) supported on the hollow mesoporous silica nanotubes (h-mSiO₂) were synthesized for the catalytic reduction of 4-nitrophenol (4-NP) and hydrodechlorination (HDC) of 4-chlorophenol (4-CP). The key point for the fabrication of the catalysts is that a certain thickness of the silica shell was wrapped on the multiwalled carbon nanotubes (MWNTs) or Pd/MWNTs through biphase stratification approach, and then the samples were calcined to remove the MWNTs. Thereby, h-mSiO₂ and [email protected]₂ samples were obtained. The prepared materials have excellent pore structure and exhibit high specific surface areas. The reduction of 4-NP by the Pd/h-mSiO₂ and [email protected]₂ catalysts showed higher TOF values than many other catalysts, and the yield of HDC of 4-CP to phenol reached 100% with a low loading of Pd in water solvent. The excellent catalytic activities of the Pd/h-mSiO₂ and [email protected]₂ catalysts should attribute to the excellent connectivity of the h-mSiO₂ which not only can increase the accessibility of the Pd active sites but also enhance the mass transfer of the reactants. It is worth mention that, there is almost no Pd NPs aggregation or losing during the reaction process, and the prepared catalysts still showed good catalytic activity and physical stability after recycling. Moreover, the catalyst shows potential for catalytic reduction of nitroarenes in a fixed bed reactor, thus could be used for continuously treat nitroarenes polluted water.

如今，用于处理有机废物的化学催化方法引起了越来越多的研究关注。在当前的研究中，合成了在中空介孔二氧化硅纳米管（h-mSiO ₂）上负载钯纳米粒子（Pd NPs）的新型催化剂，用于催化还原4-硝基苯酚（4-NP）和加氢脱氯（HDC）4-氯苯酚（4-CP）。制备催化剂的关键是通过双相分层法将一定厚度的二氧化硅壳包裹在多壁碳纳米管（MWNT）或Pd / MWNT上，然后煅烧样品以去除MWNT。因此，h-mSiO ₂和[电子邮件保护] ₂获得样品。所制备的材料具有优异的孔结构并显示出高的比表面积。Pd / h-mSiO ₂和[电子邮件保护的] ₂催化剂对4-NP的还原显示出比许多其他催化剂更高的TOF值，并且4-CP的HDC转化为苯酚的HDC收率达到100％，而Pd的负载量低在水溶剂中。Pd / h-mSiO ₂和[受电子邮件保护] ₂催化剂的出色催化活性应归因于h-mSiO ₂的出色连通性这不仅可以增加Pd活性位点的可及性，还可以提高反应物的传质能力。值得一提的是，在反应过程中几乎没有Pd NPs的聚集或流失，所制备的催化剂在循环使用后仍显示出良好的催化活性和物理稳定性。此外，该催化剂显示出在固定床反应器中催化还原硝基芳烃的潜力，因此可用于连续处理硝基芳烃污染的水。