The study aims to investigate the effect of project-based learning on students’ motivation and their self-efficacy. Project-based learning is an instructional technique which has been proven to be effective because it allows students to play an active role in their own learning process. By participating in a project-based learning model, students are able to construct their own knowledge and reflect upon their learning projects, resulting in increased motivation and self-efficacy. In this particular study, 79 students were distributed among 13 teams and each team shared a common goal. Each team was given a project, and every student in each team was assigned a task that would help the team achieve the preset goal. The project in this study was a video production that required students to work together in collaborative ways. The results of this study support the idea that project-based learning has a positive influence in students’ motivation and is able to enhance their cooperation skills as well. Furthermore, student responses in the survey taken after the project shows that the students’ perceptions toward project-based learning are very positive. Further research is suggested to find the effects of project-based learning on students’ motivation and self-efficacy in different levels, grades, or age groups.

This study evaluated the applicability of visible-light-driven N- and S-doped titanium dioxide(TiO2) for the control of low-level dimethyl sulfide(DMS) and dimethyl disulfide(DMDS). In addition, a photocatalytic unit(PU)-adsorption hybrid was evaluated in order to examine the removal of DMS and DMDS which exited the PU and a gaseous photocatalytic byproduct(SO2) which was generated during the photocatalytic processes. Fourier-Tranform-Infrared(FTIR) spectrum exhibited different surface characteristics among the three-types of catalysts. For the N- and S-doped TiO2 powders, a shift of the absorbance spectrum towards the visible-light region was observed. The absorption edge for both the N- and S-doped TiO2 was shifted to λ 720 nm. The N-doped TiO2 was superior to the S-doped TiO2 in regards to DMS degradation. Under low input concentration(IC) conditions(0.039 and 0.027 ppm for DMS and DMDS, respectively), the N-doped TiO2 revealed a high DMS removal efficiency(above 95%), but a gradual decreasing removal efficiency under high IC conditions(7.8 and 5.4 ppm for DMS and DMDS, respectively). Although the hybrid system exhibited a superior characteristic to PU alone regarding the removal efficiencies of both DMS and DMDS, this capability decreased during the course of a photocatalytic process under the high IC conditions. The present study identified the generation of sulfate ion on the catalyst surface and sulfur dioxide(maximum concentrations of 0.0019 and 0.0074 ppm for the photocatalytic processes of DMS and DMDS, respectively) in effluent gas of PU. However, this generation of SO2 would be an insignificant addition to indoor air quality levels.