Selective and stable CO electroreduction at high rates via control of local HO/CO ratio.

Controlling the concentrations of HO and CO at the reaction interface is crucial for achieving efficient electrochemical CO reduction. However, precise control of these variables during catalysis remains challenging, and the underlying mechanisms are not fully understood. Herein, guided by a multi-physics model, we demonstrate that tuning the local HO/CO concentrations is achievable by thin polymer coatings on the catalyst surface.

Identification of performance and cost in a new backwash method to clean the UF membrane: backwashing with low dosage of NaClO.

Ultrafiltration (UF) is widely used in wastewater reclamation treatments. Conventional backwashing is usually performed at regular time intervals (10-120 min) with permeate and without the addition of chemicals. Chemical enhanced backwashing (CEB) is usually applied after 70-90 filtration cycles with added chemicals.

Tandem Electrocatalytic CO Reduction with Efficient Intermediate Conversion over Pyramid-Textured Cu-Ag Catalysts.

If combined with renewably generated electricity, electrochemical CO reduction (E-COR) could be used as a sustainable source of chemicals and fuels. Tandem catalysis approaches are attractive for providing the product selectivity, which would be required for commercial applications. Here, we demonstrate a two-step tandem electrocatalytic E-COR with efficient conversion of the intermediate species.

Distribution of polycyclic aromatic hydrocarbons in surface water from the upper reach of the Yellow River, Northwestern China.

The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in water, suspended particulate matters (SPMs), and sediments in the Lanzhou reach of the Yellow River were investigated in this study. The total PAH concentrations ranged from 548 to 2598 ng/L in water, 1502 to 11,562 ng/g in SPMs, and 181 to 1583 ng/g in sediments. The compositions of PAHs showed that 2- to 3-ring PAHs were abundant in water, 2- to 4-ring PAHs were predominant in SPMs, and 2- to 5-ring PAHs were abundant in sediments.