A porous ball-flower-like Co3O4/Fe2O3 heterostructural photocatalyst was synthesized via a facile metal–organic-framework-templated method, and showed an excellent degradation performance in the model molecule rhodamine B under visible light irradiation. This enhanced photocatalytic activity can be attributed to abundant photo-generated holes and hydroxyl radicals, and the combined effects involving a porous structure, strong visible-light absorption, and improved interfacial charge separation. It is notable that the ecotoxicity of the treated reaction solution was also evaluated, confirming that an as-synthesized Co3O4/Fe2O3 catalyst could afford the sunlight-driven long-term recyclable degradation of dye-contaminated wastewater into non-toxic and colorless wastewater.

Previous scholars have demonstrated that implementation intentions have positive effects on exercise self-efficacy and exercise behaviors; however, others have found little evidence to support these results. Task difficulty has been deemed a key factor that may contribute to these discrepant findings. Therefore, we examined the effects of implementation intentions on exercise self-efficacy and exercise behavior under different task difficulty conditions. High school students (N = 90; 48 young women and 42 young men) were randomly assigned to 3 groups to receive different kinds of intervention (i.e., control group, goal intentions group, and implementation intentions group) and then were asked to hold the Navasana yoga posture under either high-difficulty or low-difficulty conditions. The results lend support to the assumption that implementation intentions help improve exercise self-efficacy and exercise behavior among high school students. The effects of implementation intentions were robust and independent of task difficulty.

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Cobalt diselenide (CoSe2) hierarchical clew-like structure is synthesized via a dual-surfactant templated hydrothermal process, and for the first time, its microwave absorption capability has been established. Specifically, the as-synthesized hierarchical interconnected structure is assembled by numerous dense nanobelts. Meticulous tuning of the synthetic conditions which could influence the hierarchical architecture indicates that, in this system, cetyltrimethylammonium bromide (CTAB) plays a dominate role of “balling” while protonated diethylenetriamine (DETA) plays the role of “stringing”. As a novel absorbent, the microwave absorption performance of CoSe2 microstructure is evaluated in 2–18 GHz band. Particularly, 3D hierarchical CoSe2 microclews exhibit superior minimum reflection loss of −26.93 dB at 7.28 GHz and effective absorption bandwidth of 3.72 GHz, which are ∼120% and ∼104% higher than those of simple CoSe2 nanosheets, respectively. Such drastic enhancement could be attributed to the large specific surface area, and more dissipation channels and scattering sites enabled by the unique clew-like microstructure. The versatile dual-surfactant templated assembly of hierarchical CoSe2 microstructure, along with its appreciable dielectric microwave absorption performance, provides new inspirations in developing novel microwave absorbents for mitigation of electromagnetic pollution.

BackgroundThe Coronavirus disease 2019 (COVID-19) pandemic broke out at the end of 2019 in China. Through a strict Zero-Tolerant strategy, the pandemic was nearly controlled in the first half of 2020, and production resumed in most regions of China. A survey was performed to explore the effect of living alone on the mental health of the economically active floating population (EAFP) in developed regions of China during the COVID-19 pandemic.MethodsThe online cross-sectional survey was conducted in work resumed time in the first half of 2020 in several developed regions of China. The 12-item General Health Questionnaire (GHQ-12) is used to assess the mental health status. The Multi-level ordinary least squares regression was performed on a total of 4,405 samples to examine the relationships between living alone and the participants' mental health.ResultsMany participants lived alone during the COVID 19 pandemic. Living alone is negatively associated with mental health (p < 0.01) for EAFP. The effect of living alone on mental health is stronger for females than males and for people with a lover than those without a lover. It is also stronger for the seniors (aged 56–70) than younger ones (aged 16–35), and has no significant influence on the middle-aged population (36–55). The effect is significant for self-employed people and employees, and is not significant for unemployed ones. Furthermore, the right amount of online entertainment can lower the effect of living alone on mental health.ConclusionThe results show that living alone strongly affected the mental health of EAFP during the COVID 19 pandemic. Moreover, this effect has generated new inequalities among different groups. In addition, to provide more public services to support people against the pandemic, the government should provide more psychological support to those who live alone and guide them to establish a correct view of marriage and love to reduce living alone negative effect and prevent them from mental health problems.