Investigation on viscosity and non-isothermal crystallization behavior of P-bearing steelmaking slags with varying TiO2 content

The viscous flow and crystallization behavior of CaO-SiO2-MgO-Al2O3-FetO-P2O5-TiO2 steelmaking slags have been investigated over a wide range of temperatures under Ar (High purity, >99.999 pct) atmosphere, and the relationship between viscosity and structure was determined. The results indicated that the viscosity of the slags slightly decreased with increasing TiO2 content. The constructed nonisothermal continuous cooling transformation (CCT) diagrams revealed that the addition of TiO2 lowered the crystallization temperature. This can mainly be ascribed to that addition of TiO2 promotes the formation of [TiO6]-octahedra units and, consequently, the formation of MgFe2O4-Mg2TiO4 solid solution. Moreover, the decreasing viscosity has a significant effect on enhancing the diffusion of ion units, such as Ca2+ and [TiO4]-tetrahedra, from bulk melts to the crystal–melt interface. The crystallization of CaTiO3 and CaSiTiO5 was consequently accelerated, which can improve the phosphorus content in P-enriched phase (n2CaO·SiO2-3CaO·P2O5). Finally, the nonisothermal crystallization kinetics was characterized and the activation energy for the primary crystal growth was derived such that the activation energy increases from −265.93 to −185.41 KJ·mol−1 with the addition of TiO2 content, suggesting that TiO2 lowered the tendency for the slags to crystallize

Self-cleaning PDA/ZIF-67@PP membrane for dye wastewater remediation with peroxymonosulfate and visible light activation

Introducing catalytic oxidation into membrane technology offers a promising prospect to overcome the fouling obstacle. Herein, a biomimetic poly-dopamine and zeolitic imidazolate framework-67 decorated polypropylene (PDA/ZIF-67@PP) membrane was fabricated via in-situ self-assembly approach, which was further employed for dye wastewater remediation with concurrent visible light and peroxymonosulfate (PMS) activation. The uniform PDA and ZIF-67 endowed the membrane with permeability 2.5 times higher than that before modification. The newly-designed membrane exhibited excellent properties in the presence of PMS and visible light, such as physical filtration, photocatalysis, PMS catalysis, recyclability, anti-fouling and self-cleaning. Mechanism insight proposed that filtration could accelerate the mass transfer efficiency of foulants onto membrane surface and pore walls, benefiting for dye degradation with synergistic effects of PMS and visible light catalysis. Quenching tests found that •SO and •O made significant contributions to dye degradation. The presented performance of visible-light PDA/ZIF-67@PP/PMS system provided a novel strategy for purification of aquatic environment

Enterprise competence organization schema: publishing the published competences

This article was published in the journal Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture [Sage © IMechE]. The definitive version is available at: http://dx.doi.org/10.1177/09544054JEM2097Competence is a standardized way to define the profile of an enterprise. Understanding and auditing competences acquired, required, and desired by a company and further representing them in a structured manner is a beneficial step for enhancing the company's performance. Ontology is emerging as an effective tool to structure competences for comprehensive and transportable machine understanding. In the present paper, ECOS (Enterprise Competence Organization Schema) is presented as a mechanism to capture enterprise competence in a manner understandable by computers. The objective behind this concept is to create a web of machine-readable pages describing basic information and competences of enterprises with sets of interconnected data and semantic models. The ECOS ontology captures enterprise competences using a consistent and comprehensive list of concepts and vocabulary and converts them into a semantic web resource using the Web Ontology Language (OWL). The novel concept of an ECOS-card and ECOS-form is proposed and used for developing and publishing enterprise competences. Examples from real-life enterprise applications of ECOS are also shown in the paper