Search

[Display omitted] • Ecological sources were identified using morphological spatial pattern analysis. • Resistance surface was developed from ecosystem service value. • Ecological corridors were identified using minimum cumulative resistance model. • The ecological network was optimized by similarity search. Ecological infrastructure is a popular framework for conservation planning. In this paper, one of the most urbanized regions of China-Shenzhen was chosen as the study area. Ecological infrastructure with different configurations and functions were identified and combined to form the urban ecological network. The ecological sources were identified using morphological spatial pattern analysis (MSPA) and landscape connectivity analysis. The ecological resistance surface developed from ecosystem service value was modified basing on ecological sensitivity and landscape connectivity. The ecological network was constructed by minimum cumulative resistance (MCR) model and then optimized and accessed. The results show that: (1) the ecological network consists of 25 ecological sources distributed mainly in the southeast and west. Twenty-nine ecological corridors were extracted and 36 ecological nodes identified. (2) In the optimized ecological network, 10 new ecological sources were added, and 46 ecological corridors and 59 ecological nodes were identified. It would promote the connectivity of the ecological sources and the stability of ecological functioning process. (3) The ecological network took ecosystem service value and ecological sensitivity into consideration and lays emphasis on improving landscape connectivity, providing an approach to optimizing urban ecological network and contributing to urban planning. [ABSTRACT FROM AUTHOR]

Fenton/photo-Fenton reaction was limited by slow Fe3+/Fe2+ cycle, low H 2 O 2 activation efficiency, and narrow applicable pH range. Here, Fe atoms doped MoS 2 (Fe–MoS 2) with abundant of low-valence Moδ+ (0 < δ < 4) was prepared. Benefiting from the powerful reduction capacity of Moδ+, the rate-limiting step of Fe3+ reduction was significantly accelerated. Nearly 100% of H 2 O 2 utilization efficiency was realized. Importantly, 90% of H 2 O 2 was effectively activated to be •OH. As a result, tetracycline degradation rate in photo-Fenton reaction catalyzed by Fe–MoS 2 was 5.8 and 4.2 times higher than those of MoS 2 and Fe–MoS 2 -Hyd (prepared by hydrothermal reaction). In comparison with MoS 2 and Fe–MoS 2 -Hyd whose efficient work range were limited in acidic condition, Fe–MoS 2 was a pH-universal catalyst (pH = 2.6–14.0) by taking advantage of the exposed Moδ+ and photoinduced electrons, largely improving the environmental tolerance. This work simultaneously addressed three bottlenecks in Fenton/photo-Fenton reaction, and provided a new strategy for the preparation of catalysts with powerful catalytic performance and high environmental adaptability. Low-valence Moδ+ sites were successfully exposed on Fe atoms doped MoS 2 surface. Benefiting from their powerful reduction capacity, the Fe3+/Fe2+ cycle rate was accelerated, the H 2 O 2 utilization efficiency and activation efficiency were maximized, and the applicable pH range was extended in photo-Fenton reaction. [Display omitted] • Fe–MoS 2 with abundant of exposed Moδ+ sites is prepared via surface engineering. • Moδ+ sites are favorable to generate Fe2+ sites and lower activation barriers of H 2 O 2. • Rate-limiting step, Fe3+/Fe2+ cycle, is accelerated by powerful reducibility of Moδ+. • 100% of H 2 O 2 utilization efficiency and 90% of activation efficiency are realized. • Applicable pH range of Fe–MoS 2 is extended to 2.6–14.0, wider than reference samples. [ABSTRACT FROM AUTHOR]