光电催化协同还原CO_2和氧化有机污染物

Photo-electrochemical synergetic reduction of CO_2 and oxidation of organic pollutants

随着大气中CO_2含量的上升和化石燃料储量的枯竭,人们越来越关注全球气候和未来能源供应的问题.那么利用丰富的太阳能将CO_2转化为诸如甲烷或甲酸的燃料可以同时解决这两个问题,并且提供了一种方便的能量储存手段.本文采用电沉积的方法在泡沫Ni上生长出高度有序的ZnO纳米片阵列,溶剂热合成将UIO-66-NH_2嫁接到Zn O上,得到催化剂UIO-66-NH_2-ZnO-Ni.结果表明:Zn O对称生长,UIO-66-NH_2均匀修饰在其表面,能够很好的吸附CO_2,使得CO_2进入孔道内,减少析氢反应.同时发现该催化剂具有优良的光电催化还原性能,光电催化还原CO_2的主要生成产物为甲酸.甲酸在3h含量达到30.98μmol.

Rising atmospheric levels of carbon dioxide and the depletion of fossil fuel reserves raised serious concerns about the ensuing effects on the global climate and future energy supply. Utilized the abundant solar energy to convert CO2 into fuels such as methane or formic acid, which could address both problems simultaneously as well as provide a convenient means of energy stroage. In this paper, good performance of UIO-66-NH2-Zn O-Ni catalyst was obtained through vertical aligned Zn O nanosheets arrays grown on the Ni foam by constant voltage deposition method followed by UIO-66-NH2 grafted into Zn O by solvent-thermal method. It turned out that the symmetrical Zn O growed from all directions on Ni foam and then modified by UIO-66-NH2 at the surface properly from the SEM images. CO2 could be absorbed into the pores easily because of the high affinity of UIO-66-NH2 which reduced the hydrogen evolution ability successfully. The catalyst also had excellent photoelectron-catalytic reduction performance and the major product was formic acid. The highest yield of formic acid was 30.98μmol in three hours.