Algae biochar (ABC), coconut shell biochar (CSBC), and coconut coat biochar (CCBC) were prepared by wet pyrolysis in a phosphoric acid solvent under normal pressure.

Circularly polarized luminescence (CPL) activity switched by Pt⋯Pt interaction is disclosed in two couples of dinuclear Pt(II) complex enantiomers. Upon varying the length of the bridging ligand, intramolecular metal–metal interaction manipulation is achieved as evidenced from crystal structures. Complex (−)-1 exhibiting strong Pt⋯Pt interaction displays red phosphorescence with a maximum peak at 638 nm, while complex (−)-2 exhibiting weak Pt⋯Pt interaction displays green phosphorescence with a maximum peak at 530 nm. The observed CPL was opposite in sign for the two complexes. TD-DFT simulations further confirmed the influence of the Pt⋯Pt distance on the difference in the electronic optical activities.

Water pollution has become a serious environmental problem to date. Advanced oxidation processes (AOP) have been widely applied in water treatments. However, the traditional Fenton reaction based on the Fe²⁺–H₂O₂ system has obvious drawbacks, limiting further practical applications. In this work, an Fe₃O₄ and nano-clothed biochar (Fe₃O₄/CBc) composite was prepared through a precipitation method and used for the degradation of methyl orange (MO) in water. The Fe₃O₄/CBc composite was characterized by FTIR, BET, SEM, TEM, XRD, and VSM. In addition, the adsorption/catalytic oxidation of MO were also tested. Specifically, Fe₃O₄/CBc had a rough surface, abundant porous structure, high surface area of 835.82 m² g⁻¹, and obvious magnetization. The catalyst showed rather high performance towards MO removal. The optimal conditions for MO removal were as follows: the dosage of hydrogen peroxide was 16 mmol L⁻¹, pH = 3, the temperature was 35 °C, and the addition amount of adsorbent was 10 mg. Under optimal conditions, the MO removal rate can be higher than 99%. The synergistic effect between catalytic degradation and adsorption in removing MO was also observed. Besides high performance in removing MO, Fe₃O₄/CBc also exhibited high stability, easy magnetic separation, and great reusability, as well as the potential to be developed as a new heterogeneous Fenton catalyst.

The distinct and reversible mechanochormic luminescence of as-prepared yellow solids of (−)-2 are displayed. The interplay of ³ π,π* monomer and excimer/ ³ MMLCT excited states is supposed to be the key for mechanochromic luminescence.

Distinct circularly polarized luminescence (CPL) activity was observed in chiral (C^∧N^∧N)Pt(II) [(C^∧N^∧N) = 4,5-pinene-6′-phenyl-2,2′-bipyridine] complexes with bis- or triphenylphosphine ligands. Compared to the pseudo-square-planar geometry of chiral (C^∧N^∧N)Pt(II) complexes with chloride, phenylacetylene (PPV) and 2,6-dimethylphenyl isocyanide (Dmpi) ligands, the coordination configuration around the Pt(II) nucleus of chiral (C^∧N^∧N)Pt(II) complexes with bulk phosphine ligands is far more distorted. The geometry is straightforwardly confirmed by X-ray crystallography. The phosphines' participation enhanced the CPL signal of Pt(II) complexes profoundly, with the dissymmetry factor (g_lum) up to 10⁻³. The distorted structures and enhanced chiroptical signals were further confirmed by time-dependent density functional theory (TD-DFT) calculations.