[Preparation and catalysis capability of single crystal Co(C3H6NS2)3 x C6H12N2S3]

A novel heterogeneous Fenton catalyst Co(C3H6NS2)3 x C6H12N2S3 was synthesized in an in-situ reaction with tetramethyl thiuram monosulfide and cobalt (II) slowly evaporating at room temperature. Its structure was characterized by single crystal X-ray diffraction (XRD). Infrared spectrum (IR) and CNH elemental analysis. The catalyst crystallizes in P-1 space group with one cobalt (III) ion, three new ligands and one dissociated TMTM molecule in the asymmetric unit, presenting a distorted octahedral geometry. Using the single crystal, the results of photocatalytic degradation of direct orchid 6 and direct green 28, as a model reaction, show that when adding between 1600 and 1200 mg x L(-1) of photocatalys, the degradation rate of direct orchid 6 and direct green 28 reach 94.39% and 94.78%. The single crystal by filtered after the Fenton reaction can be used repeatedly. Thus the cost of water treatment was reduced. The photocatalytic degradation of direct orchid 6 and direct green 28 have been experimentally demonstrated to follow the Langmuir-Hinshelwood kinetic model, meanwhile the reaction rate constants [3.03 x 10(2) and 6.25 x 10(2) mg x (L x min)(-1)] and the adsorption constants (1.52 x 10(-4) and 7.23 x 10(-5) L x mg(-1)) have been determined, respectively.