Electrochemical Metal Recycling: Recovery of Palladium from Solution and In Situ Fabrication of Palladium-Carbon Catalysts via Impact Electrochemistry.

Recycling of critical materials, regeneration of waste, and responsible catalyst manufacture have been repeatedly documented as essential for a sustainable future with respect to the environment and energy production. Electrochemical methods have become increasingly recognized as capable of achieving these goals, and "impact" electrochemistry, with the advantages associated with dynamic nanoelectrodes, has recently emerged as a prime candidate for the recovery of metals from solution. In this report, the nanoimpact technique is used to generate carbon-supported palladium catalysts from low-concentration palladium(II) chloride solutions (i.e., a waste stream mimic) as a proof of concept. Subsequently, the catalytic properties of this material in both synthesis (Suzuki coupling reaction) and electrocatalysis (hydrogen evolution) are demonstrated. Transient reductive impact signals are shown and analyzed at potentials negative of +0.4 V (vs SCE) corresponding to the onset of palladium deposition in traditional voltammetry. Direct evidence of Pd modification was obtained through characterization by environmental scanning electron microscopy/energy-dispersive X-ray spectroscopy, inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, transmission electron microscopy, and thermogravimetric analysis of impacted particles. This showed the formation of deposits of Pd0 partially covering the 50 nm carbon black particles with approximately 14% Pd (wt %) under the conditions used. This material was then used to demonstrate the conversion of iodobenzene into its biphenyl product (confirmed through nuclear magnetic resonance) and the successful production of hydrogen as an electrocatalyst under acidic conditions (under cyclic voltammetry).

Assessment of glaucoma awareness, uptake, and satisfaction with a free, targeted glaucoma screening program Southwest in Nigeria.

Background: Glaucoma is a global public eye health concern, being the number one cause of irreversible blindness. Aim: It is commoner, has an earlier onset, and is more aggressive in people of African descent. Awareness creation and screening activities have been identified as key components of the glaucoma care pathway. Subjects and Methods: This was a cross-sectional, descriptive study with analysis. The screening took place at the eye clinic, University College Hospital, Ibadan. Participants comprised all consenting adults aged 40 years and above who presented following a prescheduled telephone appointment during the 2021 World Glaucoma Week (WGW) activities. The main outcome variables were the awareness of glaucoma, and the uptake of and satisfaction with the free screening program. The associations between participants' prior awareness of glaucoma and their socio-demographic and clinical features were explored using the Chi-squared test. A P value of <0.05 was considered significant. Results: A total of 94 (47%) participants presented for the screening out of the 200 people who scheduled an appointment through the telephone appointment booking system. Forty-nine (52.1%) were males, and the mean (SD) age of participants was 55 years (10.9) with a range of 40-80 years. Fifty-eight (61.7%) participants had heard of glaucoma before the 2021 WGW awareness programs and 75.9% (44) gained some new knowledge from the programs. Newly diagnosed glaucoma was 9.6% (n = 9) of which seven (77.8%) had advanced glaucoma (CDR ≥0.9) in at least one eye. One hundred percent of the participants reported that they would recommend the screening to others. Conclusion: Targeted eye screening can help with the early detection of glaucoma. Patient satisfaction should be at the fore of eye health services to improve uptake.