5 research outputs found
Evolution of an academic–public library partnership
A partnership to improve access to health information via an urban public library system was established in St. Louis, Missouri, in 2011. A multiyear project was outlined that included an information needs assessment, a training class for public library staff, information kiosks at library branches for delivering printed consumer health materials, and a series of health-related programming. The partnership evolved to include social service and community organizations to carry out project goals and establish a sustainable program that met the health and wellness interests of the community
Mechanistic insight into pyrene removal by natural sepiolites
This paper investigates the sorption characteristics and mechanisms of pyrene onto
two types of natural sepiolite -brown (B-Sep) and white (W-Sep). The effects of
relevant properties such as clay content, surface area, pore diameter and volume,
divalent cations and organic carbon content were investigated by single component
batch adsorption systems. The results suggest that pyrene has high affinity for both
sepiolite and its sorption behaviour could be mainly affected by exchangeable strongly
hydrated cations such as Ca2+ and H2O in the zeolite-like channels and by open
channel defects (OCD) structures but no so much by the large number of Si-OH groups
located on the sepiolite's basal surfaces. Mesoporosity rather than surface area largely
controls the sorption capacity and intensity of both sepiolites. This is shown by the
increase in pore volume that exhibited the greatest increase in BET surface area.
Particle size and morphological changes of both sepiolites following pyrene adsorption
determined by FE-SEM showed that the sepiolite fibers are much longer than their
widths, which are only several laths (several nanometres). This is a result of growth,
mostly along the c-axis, at the expense of the diffusion of pyrene molecules through
aqueous solution. As a consequence, a significant fibrous morphology is produced
following the adsorption of pyrene by both sepiolites