Chitosan (CS) and nanocomposite 5%bentonite/chitosan (5%Bt/CS) prepared from the natural biopolymer CS were tested to remove Cu(II) ions using a batch adsorption experiment at various temperatures (25, 35 and 45°C). X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis/differential thermal analysis (TGA/DTA) were used in CS and the nanocomposite characterisation. This confirmed the exfoliation of bentonite (Bt) to form the nanocomposite. The adsorption kinetics of copper on both solids was found to follow a pseudo-second-order law at each studied temperature. The Cu(II) adsorption capacity increased as the temperature increased from 25 to 45°C for nanocomposite adsorbent but slightly increased for CS. The data were confronted to the nonlinear Langmuir, Freundlich and Redlich–Peterson models. It was found that the experimental data fitted very well the Langmuir isotherm over the whole temperature and concentration ranges. The maximum monolayer adsorption capacity for the Cu(II) was 404–422 mg/g for CS and 282–337 mg/g for 5%Bt/CS at 25–45°C. The thermodynamic study showed that the adsorption process was spontaneous and endothermic. The complexation of Cu(II) with NH2 and C = O groups as active sites was found to be the main mechanism in the adsorption processes.
5 Reasons to visit Lufft at Meteorological Technology World Expo
The countdown is running: From 10 to 12 October 2017, the largest international trade show for meteorological technology will take place at the Amsterdam RAI trade fair and convention center. About 200 exhibitors and 4,000 participants from more than 100 countries are expected. We sincerely invite all industry members and interested parties to our booth #8080. In the following, we give you a small fore taste… 1. From sensor technology to software: Meet 5 suppliers of different meteo components on 32m²...
Fire Station No. 5 Renovations for Seismic Retrofit - Case Study
Global was subcontracted by Mortenson/Manson, a JV, to perform work on the piles underneath Seattle Fire Station No. 5 along the Elliot Bay Seawall as part of a major seismic retrofit. The scope of work included installing the Denso Sea Shield Series 100 Pile Protection System on 18 steel piles, with the subsequent fabrication and installation of 14 collar bracing assemblies. Containment was established to fully restrain debris and sediment generated during cleaning operations, before starting any demolition or...
Application note issue #5 - Cement Analysis August 2017
Cement analysis using FP program (Fundamental Parameters) Cement is a blend of several minerals. It is critical to control the elemental composition and properties such as strength, setting, time and color. ED-XRF is being used to analyze the raw components, raw meal, clinker, and the final cement product (Na, Mg, Al, Si, S, K, Ca, and Fe in Cement, Clinker, and Raw Meal).XRF is at the heart of the control of the production process in any modern cement works and is central to the ability of the cement maker...
5 ways to bridge the gap between best community engagement practice and actual project experiences
Community engagement and impact assessment go hand-in-hand. Our core principles prize informed consultation and human rights. Many IAIA members also subscribe to the International Association for Public Participation (IAP2), striving to deliver the golden experience promised at the far side of the engagement spectrum. But any of us who’ve spent time in the field know that the ideal regularly remains just that. And project proponents are bearing the costs. In the past decade in Australia, where I live, we...
Top 5 Questions about Geoplast Formworks
Which standards does the system meet? Geoplast Formwork Systems were developed within an ISO9001 certified organization, and performance is rated according to the relevant European standards:DIN 18218:2008: Pressure of fresh concrete on vertical formwork;EN 206-1 Concrete – Part 1: Specification, performance, production, and conformity;DIN 1045: Guideline Concrete, reinforced and prestressed concrete structures. Are plastic formworks environmentally safe?Geoplast reusable Formworks are made of ABS (Acrylonit...