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We need a practical, inexpensive, and green way to reduce the environmental pollutants, especially for dye wastewater. The discharge of industrial wastewater such as organic dyes will cause serious pollution to water bodies, thereby affecting people's lives. In this work, we designed and successfully synthesized four new ligand catalysts. The total outputs of diamide diamino iron ligand compounds A and B are 71.33% and 61.39%, respectively. The total outputs of polyaromatic iron tetraamido macrocyclic ligand (TAML) compounds C and D are 38.49% and 49.11%, respectively. The catalytic effects of four catalysts on the degradation of dye wastewater by hydrogen peroxide oxidation were studied and compared with the second‐generation FeIII‐TAML catalyst. The experimental results showed that acyclic catalyst A and B has good catalytic effect. For methylene blue, methyl orange, rhodamine B three dyes wastewater, under the conditions of 20°C, Ccatalyst A = 0.056–0.28 mM and Chydrogen peroxide = 33 mM, the decolorization rate and chemical oxygen demand (COD) removal rate are 81.53%–97.58% and 52.2%–60.7%, respectively. Under the condition of 20°C, Ccatalyst B = 0.75 mM and Chydrogen peroxide = 33 mM, the decolorization rate and COD removal rate are 48.33%–80.33% and 44.6%–57.8%, respectively. [ABSTRACT FROM AUTHOR]

We need a practical, inexpensive, and green way to reduce the environmental pollutants, especially for dye wastewater. The discharge of industrial wastewater such as organic dyes will cause serious pollution to water bodies, thereby affecting people's lives. In this work, we designed and successfully synthesized four new ligand catalysts. The total outputs of diamide diamino iron ligand compounds A and B are 71.33% and 61.39%, respectively. The total outputs of polyaromatic iron tetraamido macrocyclic ligand (TAML) compounds C and D are 38.49% and 49.11%, respectively. The catalytic effects of four catalysts on the degradation of dye wastewater by hydrogen peroxide oxidation were studied and compared with the second‐generation FeIII‐TAML catalyst. The experimental results showed that acyclic catalyst A and B has good catalytic effect. For methylene blue, methyl orange, rhodamine B three dyes wastewater, under the conditions of 20°C, Ccatalyst A = 0.056–0.28 mM and Chydrogen peroxide = 33 mM, the decolorization rate and chemical oxygen demand (COD) removal rate are 81.53%–97.58% and 52.2%–60.7%, respectively. Under the condition of 20°C, Ccatalyst B = 0.75 mM and Chydrogen peroxide = 33 mM, the decolorization rate and COD removal rate are 48.33%–80.33% and 44.6%–57.8%, respectively. [ABSTRACT FROM AUTHOR]

To reduce the cost of water treatment reagents, a simplified iron(III) tetraamido macrocyclic ligand compound (FeIII-TAML) was synthesized with a total yield of 53.3%. For comparison, two second generation FeIII-TAML catalysts were synthesized. The synthetic route was optimized, and the total yield increased from 30.1% to 49.5%. The catalytic activity of the simplified catalyst for degradation of dye wastewater by hydrogen peroxide was tested and compared with that of the second generation FeIII-TAML catalysts. The experimental results show that the simplified catalyst has good catalytic activity. At 25 °C, pH = 8, CFe-TAML = 50 mg/L, and Chydrogen peroxide = 1.5 g/L, the decolorization and chemical oxygen demand removal of methylene blue, methyl orange, neutral red, and Rhodamine B dye wastewater were 74.8%–96.1% and 46.9%–63.7%, respectively. [ABSTRACT FROM AUTHOR]

[Display omitted] • The deactivated SCR catalyst used as Ti resources to prepare CaCO 3 -TiO 2 composite opacifier has great significance in achieving the recycling of the spent SCR catalysts. • The composite has the same opacifying performance as ZrSiO 4。 • Compared with ZrSiO 4 , CaCO 3 -SCR in the field of sanitary ceramics can reduce the costs and avoid the radiation in the glaze containing zirconium. • The composite opacifier avoids the yellowing when only TiO 2 is as opacifier because CaCO 3 -TiO 2 composite can promote the formation of sphene. A CaCO 3 -TiO 2 composite (CaCO 3 -SCR) was prepared by a facile mechanochemistry method using CaCO 3 and TiO 2 from the deactivated SCR catalysts. The results show that the CaCO 3 -SCR composite as opacifiers exhibits excellent opacifying performance. The FT-IR results indicate that -Ca-O-Ti- bonds existing between CaCO 3 and TiO 2 from the deactivated SCR catalysts combine them. The main opacifying phase is the sphene phase with particles size about 0.5–1 μm. Moreover, no excess crystalline TiO 2 was observed in the glaze, indicating that fixing TiO 2 is the key to preventing glaze from yellowing. [ABSTRACT FROM AUTHOR]

To reduce the cost of water treatment reagents, a simplified iron(III) tetraamido macrocyclic ligand compound (FeIII-TAML) was synthesized with a total yield of 53.3%. For comparison, two second generation FeIII-TAML catalysts were synthesized. The synthetic route was optimized, and the total yield increased from 30.1% to 49.5%. The catalytic activity of the simplified catalyst for degradation of dye wastewater by hydrogen peroxide was tested and compared with that of the second generation FeIII-TAML catalysts. The experimental results show that the simplified catalyst has good catalytic activity. At 25 °C, pH = 8, CFe-TAML = 50 mg/L, and Chydrogen peroxide = 1.5 g/L, the decolorization and chemical oxygen demand removal of methylene blue, methyl orange, neutral red, and Rhodamine B dye wastewater were 74.8%–96.1% and 46.9%–63.7%, respectively. [ABSTRACT FROM AUTHOR]