2D/2D BiMoO/CoAl LDH S-scheme heterojunction for enhanced removal of tetracycline: Performance, toxicity, and mechanism.

In this paper, the two-dimensional (2D) layered CoAl LDH (CoAl) was coupled with BiMoO (BMO) nanoplate and used for tetracycline (TC) degradation. Based on the results of UV-visible diffuse reflectance spectrum (UV-vis DRS), Motty-Schottky curves, and in situ X-ray photoelectron spectroscopy (XPS), a novel 2D/2D BiMoO/CoAl LDH S-scheme heterojunction photocatalyst was built. The photodegradation rate constant of TC by the optimized sample BMO/CoAl30 was 3.

Rice husk hydrochar prepared by hydrochloric acid assisted hydrothermal carbonization for levofloxacin removal in bioretention columns.

Hydrochars are promising adsorbents in pollutant removal for water treatment. Herein, hydrochloric acid (HCl) co-hydrothermally treated hydrochars were prepared from rice husk biomass at 180 °C via a one-step hydrothermal method. Adsorption behaviors of levofloxacin (LVX) on hydrochars were evaluated.

Adsorption and photodegradation of reactive red 120 with nickel-iron-layered double hydroxide/biochar composites.

Layered double hydroxide (LDH) materials were widely applied for adsorption and photodegradation of pollutants for wastewater treatment. New efficient LDH materials with adsorption and photodegradation abilities will be promising candidates for pollutants removal. Hence, a series of NiFe-LDH/biochar (NiFe/BC) were fabricated by the coprecipitation method for synergistic adsorption and photodegradation anionic dyes of reactive red 120 (RR120).

Step scheme nickel-aluminium layered double hydroxides/biochar heterostructure photocatalyst for synergistic adsorption and photodegradation of tetracycline.

Improving the adsorption ability of layered double hydroxide (LDH) has been considered as a promising strategy to promote its photodegradation of aqueous pollutants. In this work, nickel-aluminium layered double hydroxides (NiAl-LDH)/biochar nanocomposites were prepared using a simple coprecipitation method, and then applied in synergistic adsorption-photodegradation of tetracycline (TC) in aqueous solutions. In addition, the governing TC removal mechanisms by the nanocomposites were revealed.

Transformation of Highly Stable Pt Single Sites on Defect Engineered Ceria into Robust Pt Clusters for Vehicle Emission Control.

Engineering surface defects on metal oxide supports could help promote the dispersion of active sites and catalytic performance of supported catalysts. Herein, a strategy of ZrO doping was proposed to create rich surface defects on CeO (CZO) and, with these defects, to improve Pt dispersion and enhance its affinity as single sites to the CZO support (Pt/CZO). The strongly anchored Pt single sites on CZO support were initially not efficient for catalytic oxidation of CO/CH.

Revealing the effect of paired redox-acid sites on metal oxide catalysts for efficient NO removal by NH-SCR.

Understanding the nature of active sites on metal oxide catalysts in the selective catalytic reduction (SCR) of NO by NH (NH-SCR) is a crucial prerequisite for the development of novel efficient NH-SCR catalysts. In this work, two CeO-based SCR catalyst systems with diverse acidic metal oxides-CeO interfaces, i.e.

Ce-Si Mixed Oxide: A High Sulfur Resistant Catalyst in the NH-SCR Reaction through the Mechanism-Enhanced Process.

Investigating catalytic reaction mechanisms could help guide the design of catalysts. Here, aimed at improving both the catalytic performance and SO resistance ability of catalysts in the selective reduction of NO by NH (NH-SCR), an innovative CeO-SiO mixed oxide catalyst (CeSi2) was developed based on our understanding of both the sulfur poisoning and reaction mechanisms, which exhibited excellent SO/HO resistance ability even in the harsh working conditions (containing 500 ppm of SO and 5% HO). The strong interaction between Ce and Si (Ce-O-Si) and the abundant surface hydroxyl groups on CeSi2 not only provided fruitful surface acid sites but also significantly inhibited SO adsorption.

Pore Size Expansion Accelerates Ammonium Bisulfate Decomposition for Improved Sulfur Resistance in Low-Temperature NH-SCR.

Sulfur poisoning has long been recognized as a bottleneck for the development of long-lived NH-selective catalytic reduction (SCR) catalysts. Ammonium bisulfate (ABS) deposition on active sites is the major cause of sulfur poisoning at low temperatures, and activating ABS decomposition is regarded as the ultimate way to alleviate sulfur poisoning. In the present study, we reported an interesting finding that ABS decomposition can be simply tailored via adjusting the pore size of the material it deposited.

Synthesis of CrO /C catalysts for low temperature NH-SCR with enhanced regeneration ability in the presence of SO.

Chromium oxide nano-particles with an average diameter of 3 nm covered by amorphous carbon (CrO /C) were successfully synthesized. The synthesized CrO /C materials were used for the selective catalytic reduction of NO by NH (NH-SCR), which shows superb NH-SCR activity and in particular, satisfactory regeneration ability in the presence of SO compared with Mn-based catalysts. The as-prepared catalysts were characterized by XRD, HRTEM, Raman, FTIR, BET, TPD, TPR, XPS and FTIR techniques.

Migration of copper species in CeCuO catalyst driven by thermal treatment and the effect on CO oxidation.

A Cu-doped CeO solid solution was constructed by co-precipitation and additional acid treatment to investigate the behavior of doped copper under thermal treatment. Acid treatment was used to intentionally remove the surface Cu species. Surface properties and fundamental characteristics of the catalysts were characterized by several techniques, as well as the CO oxidation performance.