No abstract

It is proposed that sorption is a combination of two fundamentally different processes: adsorption and partitioning. A sorption model was developed for both single-component and multicomponent systems. The model was tested using single-component experimental isotherm data of eight toxic organic compounds. Partitioning dominates the sorption process for compounds with high sorbability or high octanol-water partition coefficient, Xow. Binary sorption data were compared with the present model. The proposed model fitted experimental data well. It was found that Kow could be used to assess the competition effect in a multicomponent system. The competition is negligible when K0VI is larger than 1000. When Kow is smaller than 500, there is a significant competition effect. In very dilute solutions, the effect of the presence of a competing species can be ignored.

Highly crystalline and idiomorphic CoTiO single crystals with a well-defined polyhedral morphology were grown successfully for the first time by a facile flux method. Herein, the effects of the molten salt type and cobalt precursor on the phase composition, crystallization habit and morphology of the CoTiO products were also investigated. Importantly, using the flux-grown CoTiO crystal as the visible-light sensitizer due to its narrow band gap to couple with graphitic carbon nitride (g-CN) by a direct in situ thermal induced polycondensation route, novel CoTiO/g-CN composite photocatalysts were obtained. The as-synthesized samples were systematically characterized by XRD, EDS, SEM, TEM, SAED, HRTEM, FT-IR, XPS, DRS and PL techniques. The results revealed that CoTiO polyhedral crystals were closely combined with g-CN nanosheets leading to the formation of a heterojunction structure at the interface between CoTiO and g-CN. Photocatalytic evaluation showed that the heterostructured CoTiO/g-CN composite exhibited much higher photocatalytic activity for the degradation of methyl orange under visible light irradiation than that of individual CoTiO and g-CN, which could be mainly ascribed to the synergistic effect between CoTiO and g-CN, including the enhanced visible-light harvesting ability and more efficient separation and longer lifetime of photogenerated charge carriers. Furthermore, the composite photocatalyst showed an excellent stability and reusability during four successive cycles. Finally, a possible mechanism responsible for the charge separation and improved photocatalytic activity was proposed.

Abstract

This study was designed to investigate the relationship between plasma lipid profile and acne. Acne patients (n = 181) and healthy volunteers (n = 130) matched in terms of both age and sex were enrolled. Plasma total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol, low-density lipoprotein cholesterol (LDL-C) and lipoprotein (LP)(a) levels were measured. TC, LDL-C and LP(a) levels in male and female patients with severe acne were significantly higher than in the healthy control group (P < 0.05). TG in male patients with severe and moderate acne was significantly higher than in the healthy control group (P < 0.05). LP(a) in male and female patients with mild, moderate and severe acne was significantly higher than in the healthy control group (P < 0.05). The constituent ratio of male and female patients with TC, TG, LDL-C and LP(a) over the normal range was significantly higher than in the healthy control group. In this study, acne patients were frequently associated with abnormal lipid profile, providing a new basis for further exploration of the pathogenesis, as well as new treatments, of acne vulgaris.