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Articles by Haijun Cheng
Controllable and Nanoscale Linear Etching of Atomic Layer Deposited Molybdenum Using Cyclic Stepwise CHF 3 /O 2 Plasma
1 Introduction As logic technology nodes scale toward the Angstrom era, the saturation of pitch scaling has shifted the focus of semiconductor performance from transistor scaling to innovations in interconnect architectures [1]. Interconnect resistance-capacitance (RC) delay has surpassed transistor gate delay as the primary limiting factor for system energy efficiency and frequency. Copper (Cu) interconnect faces several physical limits at critical dimensions below 10 nm.
UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)
This paper investigated ultraviolet A light-emitting diode (UVA-LED) irradiation to activate Fe(VI) for the degradation of micropollutants (e.g., sulfamethoxazole (SMX), enrofloxacin, and trimethoprim). UVA-LED/Fe(VI) could significantly promote the degradation of micropollutants, with rates that were 2.6–7.2-fold faster than for Fe(VI) alone. Comparatively, UVA-LED alone hardly degraded selected micropollutants.
Kinetics of Thallium(I) Oxidation by Free Chlorine in Bromide-Containing Waters: Insights into the Reactivity with Bromine Species
The oxidation of thallium [Tl(I)] to Tl(III) by chlorine (HOCl) is an important process changing its removal performance in water treatment. However, the role of bromide (Br–), a common constituent in natural water, in the oxidation behavior of Tl(I) during chlorination remains unknown.
Thallium(I) Oxidation by Permanganate and Chlorine: Kinetics and Manganese Dioxide Catalysis
The oxidation of the toxic heavy metal thallium(I) (Tl(I)) is an efficient way to enhance Tl removal from water and wastewater. However, few studies have focused on the kinetics of Tl(I) oxidation in water, especially at environmentally relevant pH values. Therefore, the kinetics and mechanisms of Tl(I) oxidation by the common agents KMnO4 and HOCl under environmentally relevant pH condition were explored in the present study.
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