%0 Journal Article
%@ 01677322
%A Nadeem, S.
%A Mumtaz, A.
%A Mumtaz, M.
%A Abdul Mutalib, M.I.
%A Shaharun, M.S.
%A Abdullah, B.
%D 2018
%F scholars:9485
%I Elsevier B.V.
%J Journal of Molecular Liquids
%K Carbon dioxide; Copper compounds; Light; Mass transfer; Mesoporous materials; Methanol; Molecular orbitals; Photocatalysts; Porphyrins; Sodium hydroxide; Sodium sulfite, Lowest occupied molecular orbitals; Mass transfer limitation; Mesoporous; Metalloporphyrins; Supporting electrolyte; Ti-mcm-48; Visible light excitation; Visible-light irradiation, Titanium compounds
%P 656-667
%R 10.1016/j.molliq.2018.09.077
%T Visible light driven CO2 reduction to methanol by Cu-porphyrin impregnated mesoporous Ti-MCM-48
%U https://khub.utp.edu.my/scholars/9485/
%V 272
%X Mesoporous Ti-MCM-48 photocatalyst, with Si/Ti (wt/wt) ratio of 100, 50 and 25 was effectively applied for CO2 reduction into methanol under UV�visible light irradiation bearing mid gap energy states and Ti3+ sites. The bare Ti-MCM-48 with Si/Ti (wt/wt) ratio of 25 displayed highest photocatalytic methanol yield (85.88 μmol g�1 L�1) with a BET surface area of 1528 m2 g�1 and mid gap energy states as determined from the XPS analysis, compared to the other composite ratios. The Ti-MCM-48(25) impregnated with Cu-porphyrin (CuTPP) resulted in methanol yield of 297 μmol·g�1 under 33 mW·cm�2 simulated light intensity, using 0.1 M Na2SO3 in 0.1 M NaOH as supporting electrolytes, which is 3.45 times higher than the bare Ti-MCM-48(25) due to the visible light excitation of the porphyrin macrocycle and charge transition from the lowest occupied molecular orbital (LUMO) of CuTPP to the Ti3+ metal centers. Also, methanol yield was studied with CO2 gas-liquid mass transfer and mass transfer limitations prevailing in the reactor. Mass transfer limitation experiments revealed that metal loading, catalyst concentration, stirring speed and light intensity influence the methanol yield. © 2018 Elsevier B.V.
%Z cited By 30