[en] The tetranuclear complex reported here shows luminescence features by using the electronic emission spectrum in the DMF solution at room temperature as given in Figure 3. The title complex shows high-energy emission at ca. 444 nm, which is assigned to originate predominantly from ligand-to-metal charge-transfer LMCT [NO_3"- → Ag]. Though the polynuclear d"1"0 metal complexes were discovered a long time ago, the study on photophysical and photochemical characters of polynuclear d"1"0 metal complexes has attracted much attention and developed rapidly in the last decades of last century. With the development of the computer hardware and software, theoretical studies on polynuclear d"1"0 metal systems can be more accurate and efficient. However, there are a number of difficulties to be overcome in the design of this kind of complexes with bridging and ancillary liagnds, such as bis(diphenylphosphino) methane (dppm). Dppm (Ph_2PCH_2PPh_2) is not only a very excellent bridging ligand for bonding two metal atoms to form stable eight-numbered ring [M(μ_2-dppm)_2M'] which are well known with many structural and applied studies, but also sometimes act as mono-dentate ligand. Dppm can also form a number of trinuclear complexes [M_3(μ-dppm)_3] with late transition metal ions, especially, d"1"0 metals ions. When M = Cu(I) or Ag(I), a capping ligand always accompanies the [M_3(μ-dppm)_3] core by the coordination mode of μ3-bridging.

[en] Interfacial photo-vapor conversion has been suggested as a cost-effective and sustainable technology for seawater desalination. However, the conversion performance was still limited by some drawbacks, like salt accumulation and poor mechanical stability. Herein, a scalable MoS${}_2$-based porous hydrogel (SMoS${}_2$-PH) with good mechanical stability and salt resistance was successfully constructed through a crosslinking foaming polymerization method. With the high porosity (92.63 %), the SMoS${}_2$-PH performed an impressive evaporation rate of 3.297 kg m${}^{-<!--\; ???\; -->2}$ h${}^{-<!--\; ???\; -->1}$ and photothermal conversion efficiency of 93.4 % under 1-sun illumination. Most importantly, the SMoS${}_2$-PH could maintain high and stable photothermal properties for 15 days on the surface of seawater. We believe that the excellent salt resistance, the high photothermal conversion efficiency, the ease of scale preparation method and the available commercial MoS${}_2$ make the SMoS${}_2$-PH a promising device for full-scale seawater desalination. (© 2022 Wiley‐VCH GmbH)

[en] Highlights: • Fe₃O₄@SiO₂/β-NaYF₄:Yb³⁺,Tm³⁺/TiO₂ composites have been successfully fabricated. • The upconversion of energy transfer from β-NaYF₄:Yb³⁺,Tm³⁺ to TiO₂ was confirmed. • Fe₃O₄@SiO₂/β-NaYF₄:Yb³⁺,Tm³⁺/TiO₂ composites exhibit photocatalytic activity in NIR. • The composites can be easily magnetic separated from water after application. • The composites show good stability indicated from four recycled tests. - Abstract: To extend the activities of TiO₂ to the near infrared (NIR) region and to separate and recycle photocatalysts easily is vital for the high harvest of solar energy for sustainable society. The magnetic NIR activated Fe₃O₄@SiO₂/β-NaYF₄:Yb³⁺,Tm³⁺/TiO₂ (FS/UC/T) composites have been synthesized by using the solvothermal method by adding Fe₃O₄@SiO₂ and Degussa P25 into the mixed solution of NaOH, ethanol, oleic acid, Re(NO₃)₃ and NH₄F. Moreover, the obtained composites were explored for photocatalytic applications. It was found that FS/UC/T emit UV–vis light under irradiation of 980 nm laser and efficient energy transfer from β-NaYF₄:Yb³⁺,Tm³⁺ to TiO₂ was verified. The photodegradation experiments for treating methylene blue (MB), rhodamine B (RhB), methyl orange (MO) and colorless phenol were carried out to evaluate the photocatalytic activities of the samples. The photodegradation rates reach 76.62%, 68.48%, 30.05% and 27.16% for MB, RhB, MO and phenol under irradiation of 980 nm laser, respectively, which suggested magnetic FS/UC/T composite is an advanced NIR-driven photocatalyst. Moreover, the magnetic photocatalyst showed easy separation and good stability in the recycled tests. It suggested a promising system to utilize the NIR energy for photocatalysis based on TiO₂ and to utilize the magnetic for separation of photocatalysts, which will contribute to practical environmental remediation in the future.

[en] Highlights: • C. meneghiniana exhibited a higher NAs formation potential than M. aeruginosa. • The variation of algae concentration and chloramine dosage affected the NAs formation. • IOM was the main source of precursors for NAs formation. • The contribution of MC-LR to the NAs formation was greater than Chlorophyll-a. The contribution of two algae species, Microcystis aeruginosa (M. aeruginosa) and Cyclotella meneghiniana (C. meneghiniana), to the formation of nitrosamines (NAs) during chloramination in drinking water treatment was investigated. A variety of factors including contact time, algae cell concentration, chloramine dosages, and algal cell components (cell debris (CD), intracellular organic matter (IOM), and extracellular organic matter (EOM)) were evaluated for influencing the formation of different NAs, such as N-Nitrosodiethylamine (NDMA), N-Nitrosomethylethylamine (NMEA), N-Nitrosodibutylamine (NDBA), N-Nitrosodi-n-propylamine (NDPA), and N-nitrosopyridine (NPyr). In addition, NAs formation from Chlorophyll-a and Microcystin-LR (MC-LR) after chloramination was studied. These results showed that the increase of reaction time and algae cell concentration enhanced the formation potential of five types of NAs from both algae species, except for the NDMA formation from C. meneghiniana, which increased first and then decreased with increased reaction time. The generation of NDMA was detected as the dominated type of NAs. The formation of total NAs from both algae species followed same pattern of increasing first and then decreasing with the increase of chloramine dosage. The largest NAs formation potential (NAsFP) of M. aeruginosa and C. meneghiniana showed at 1.5 mM and 1.0 mM monochloramine, respectively. Moreover, the impacts of algae cellular components on the formation potential of NAs followed the order of IOM > EOM ≫ CD and IOM ≫ CD > EOM for M. aeruginosa and C. meneghiniana, respectively, indicating that IOM was the main source of NAs precursors for both algae. Furthermore, EEM analysis before and after chloramination confirmed that the soluble microbial products (SMPs) and protein-like substances were the main cellular components that contributed to NAs formation for both algae. The NAs formation potential of Microcystin-LR was much higher than that of Chlorophyll-a chloramination.

[en] Highlights: • Au-Pd/RGO with formation of bimetallic Au-Pd alloy was synthesized by a facile reflux approach. • The Au-Pd/RGO exhibits higher catalytic activity than both Au/RGO and Pd/RGO. • The promising material for fine-chemical synthesis. A facile, stabilizing-molecules-free strategy has been utilized for anchoring Au-Pd alloy nanoparticles onto the flat surface of two-dimensional (2D) reduced graphene oxide (RGO) nanosheets. Formation of Au-Pd nanoalloys and loading onto the RGO are accomplished simultaneously. The Au-Pd/reduced graphene oxide (Au-Pd/RGO) exhibits higher catalytic activity than both Au/RGO and Pd/RGO, prepared by the same approach toward selective oxidation of benzyl alcohol and selective reduction of nitroaromatics, the catalytic activity order can be in good agreement with the noble metal particles size distribution of the Au, Pd and Au-Pd/RGO.