Molecular response to the influences of Cu(II) and Fe(III) on forming biogenic manganese oxides by Pseudomonas putida MnB1.

The biogeochemical cycle of biogenic manganese oxides (BioMnOx) is closely associated with the environmental behavior and fate of various pollutants. It is significantly interfered by many metals, such as Cu and Fe. However, the bacterial molecular responses are not clear.

(Na, Pb)-Jarosite nucleation and growth on anglesite: Implications for inhibition of Pb releasing.

The mobility and bioavailability of Pb can be significantly reduced by Pb-bearing minerals encapsulation in jarosite-group minerals, especially in sulfate-rich environments. However, the kinetic pathways and mechanisms of jarosite-group minerals formations on Pb-bearing mineral surfaces are not well understood. Here, time-resolved heterogeneous (Na, Pb)-jarosite nucleation and growth on anglesite were explored to gain insights into the encapsulation mechanisms.

Capture gaseous arsenic in flue gas by amorphous iron manganese oxides with high SO resistance.

In non-ferrous metal smelting, the problem of gaseous arsenic in high-sulfur flue gas is difficult to solve. Now we have developed oxygen-enriched amorphous iron manganese oxide (AFMBO) based on the unique superiority of iron-manganese oxide for arsenic capture to realize the effective control of gaseous arsenic in the non-ferrous smelting flue gas. The experimental results show that the arsenic adsorption capacity of AFMBO is up to 102.

The determinants of effective defluorination by the LiAl-LDHs.

Millions of people in poor areas are still under the threat of fluoride contamination. How to effectively separate fluorine in water is an important step to reduce the ecological risk. In this paper, we performed a systematic DFT calculation focused on the defluorination behavior between the LiAl- and MgAl-LDHs.

The role of doped-Mn on enhancing arsenic removal by MgAl-LDHs.

To meet the challenges posed by global arsenic water contamination, the MgAlMn-LDHs with extraordinary efficiency of arsenate removal was developed. In order to clarify the enhancement effect of the doped-Mn on the arsenate removal performance of the LDHs, the cluster models of the MgAlMn-LDHs and MgAl-LDHs were established and calculated by using density functional theory (DFT). The results shown that the doped-Mn can significantly change the electronic structure of the LDHs and improve its chemical activity.

Design of a high-performance ternary LDHs containing Ni, Co and Mn for arsenate removal.

To cope with the current serious arsenate pollution problem, a new ternary layered double hydroxides (LDHs) containing Ni, Co and Mn with good performance was developed, guiding by DFT calculations. First, Ni, Co and Mn were screened as the metal sources to constitute the LDHs, due to their high ionic charge density. Then, Ni(II), Co(II) and Mn(III)-O octahedra were selected as the primary units for structuring the LDHs, because of their good chemical activity.

As(III) removal from wastewater and direct stabilization by in-situ formation of Zn-Fe layered double hydroxides.

In order to remove and stabilize As(III) simultaneously from wastewater, a novel and effective method based on the in-situ formation of As(III)-containing Zn-Fe layered double hydroxides (ZnFe-As-LDHs) was developed. The influence of pH, Zn/Fe, Fe/As and adding rate on the formation of ZnFe-As-LDHs were investigated. Under the optimal conditions, the concentration of As(III) decreased from 100 to 0.

Metalized Alkanedithiol Self-Assembled Monolayers (SAM) on Au Surfaces by an Autocatalytic Mechanism.

Here, a simple and general approach was developed for depositing metal nanoparticles on alkanedithiol self-assembled monolayers (SAMs) based on the spontaneous reduction of metal ions by the free SH sites of SAMs. By immersing the alkanedithiol SAM/Au in a corresponding metalcontaining solution (HAuCl₄, AgNO₃, H₂PtCl and PdSO₄), Au, Ag, Pt and Pd clusters, respectively, could be formed on top of the SAM/Au(111) electrode surface, which was confirmed by STM characterization. The size, morphology and coverage of clusters/islands can be tuned by modulating the immersion time, which allows for possible utilization of the metal/SAM/Au(111) in catalysis, nanoelectronics and biodetection.

Metastable Dissolution Regularity of Nd in NaCO Solution and Mechanism.

The carbonate solution-dissolved rare earth showed some metastable chemical characteristics. In this paper, the systematic investigation of metastable dissolution regularity of Nd in NaCO solution was carried out. The results showed that Nd has an instantaneous saturated solubility in NaCO solution.