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Photocatalyst separation from aqueous dispersion using graphene oxide/TiO<sub>2</sub> nanocomposites
Szabo, T.,Veres, A.,Cho, E.,Khim, J.,Varga, N.,Dekany, I. Elsevier 2013 Colloids and surfaces. A, Physicochemical and engi Vol.433 No.-
A series of nanocomposite photocatalysts was prepared from aqueous dispersions of Degussa P25 TiO<SUB>2</SUB> and exfoliated graphite oxide (GO) by heterocoagulation. The structure and catalytic activity of samples in the photooxidation of phenol were characterized in line with their separability by controlled settling experiments at different pHs, irradiation times and mechanical exposure. It was found that single or few-layer graphene oxide sheets were dispersed uniformly in the matrix of titanium dioxide aggregates and were partially reduced to oxygen-containing graphene-like carbon. Although the presence of GO was associated with a loss of photocatalytic efficiency, it has induced an accelerated sedimentation of catalyst slurry as compared to pure TiO<SUB>2</SUB>, resulting in the complete separation of photocatalyst from the treated water in a highly reduced time scale. The loose physical network of weakly adhered particles can be destroyed by sonication or other strong mechanical impacts, but spontaneous aggregation occurs upon mild redispersion. Therefore, heterocoagulation is reversibly induced and can be used to collect the finely suspended catalyst particles worn off from the composite. Extensive reuse of the catalyst without its abrasion and the concomitant need of its post-treatment separation is thus possible. Along with the beneficial sedimentation properties of the composites, this facilitates their use for large scale treatment of waste waters.
Andrew J. Muzyk,Jane P. Gagliardi,Gopalkumar Rakesh,Michael R. Jiroutek,Rajiv Radhakrishnan,배치운,Prakash S. Masand,Steven T. Szabo 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.3
Objective: A clinically relevant approach to patient care grounded in neurobiological constructs and evidence based practice which emphasizes a relevant psychopharmacology is needed to optimally train psychiatry residents. Methods: We implemented a biological psychiatry course that now incorporates neurobiology, psychopharmacology, and evidencebased practice in conjunction with a Research Domain Criteria (RDoC) perspective. A survey launched prior to course implementation and following each class session, served as the outcome metric of residents’ attitudes toward the new curriculum and followed a baseline attitudinal survey designed to evaluate the program. Results: Greater than 90% of the psychiatry residents at Duke University who took the attitudinal survey agreed or strongly agreed with needing a course that helped them develop an understanding of neurobiology, psychopharmacology, and evidence-based practice concepts. Most residents also indicated a less than adequate understanding of the neurobiology and psychopharmacology of psychiatric disorders prior to sessions. Conclusion: Our biological psychiatry curriculum was associated with enthusiasm among residents regarding the incorporation of neurobiology, psychopharmacology, and evidence-based practice into course topics and discussions. A biological psychiatry curriculum with integrated neurobiology and psychopharmacology built on an evidence base approach is possible, well-received, and needed in training of future psychiatrists.