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A novel thermo-responsive 2,9(10),16(17),23(24)-tetrakis[(3-carboxyacrylamide) phthalocyaninato] zinc (ZnPc)-g-TiO2-g-poly(N-isopropylacrylamide) (PNIPAM) photocatalyst modified with phthalocyanines was prepared. The photocatalyst exhibited thermo-responsive properties due to the introduction of PNIPAM, which performed recovery for reuse above the lower critical solution temperature (LCST, about 26 °C). ZnPc-g-TiO2-g-PNIPAM effectively expanded the light response range to the visible light region and inhibited the recombination of electron–hole pairs, which enhanced the performance of the photocatalyst. As expected, ZnPc-g-TiO2-g-PNIPAM (0.3 g/L) exhibited excellent photocatalytic performance for the removal of Rhodamine B (RhB, 1.0 × 10−5 mol/L) and methylene blue (MB, 1.0 × 10−5 mol/L) under visible light, which reached 97.2% and 88.6% at 20 °C within 40 min, respectively. Furthermore, the influence of temperature upon photocatalytic performance was also investigated. When the temperature increased from 20 °C to 45 °C, the removal of RhB decreased by approximately 53.8%. The stability of the photocatalyst demonstrated that the photocatalytic activity was still above 80% for the removal of RhB after 3 cycles. Above all, this work provided an intelligent thermally responsive photocatalyst based on phthalocyanine for water purification under visible light.

In the face of increasing risks caused by high power lasers, nonlinear optical (NLO) materials like porphyrins (Por) have attracted interest because of their outstanding NLO properties. However, the performance of porphyrins is still far from practical application. Here, Carbon dots (CDs) and a series of porphyrins were combined to synthesize the Por-CDs nanohybrids. The nonlinear and photo physical of Por-CDs hybrid materials were investigated. The Por-CDs was confirmed by Fourier Infrared Spectroscopy (FT-IR), Fluorescence spectra and TEM. The nonlinear optical (NLO) performance of Por-CDs was evaluated by the Z-scan test. Nonlinearity present in Por-modified CDs. At same transmission intensity, the Por-CDs composites showed enhanced NLO properties in comparison to the Por and CDs. This research provides a promising route for the design of novel NLO materials.

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