This study examined the feasibility of removing amoxicillin (AMO) from aqueous solutions using multi-wall carbon nanotubes. The equilibrium adsorption data were analyzed using four widely applied isotherms: Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich. The results showed that the Langmuir isotherm model fits well the obtained experimental data. The adsorption process followed the pseudo-second-order model. The activation energy was found to be 19 kJ/mol. The Standard free energy changes, ΔG0, values were negative; the standard enthalpy change (ΔH0), and standard entropy change (ΔS0) values of the process were 4 kJ/mol and 36 J/mol.K. Results suggested that the AMO adsorption on carbon nanotubes was a spontaneous process.
Analyzing Lubricant and Machinery Condition Using Q5800 Portable Oil Analysis Lab - Case study
OverviewThe United States Marine Corps (USMCJ maintains a fleet of thousands of mechanized vehicles consisting of heavy equipment ranging from bulldozers to transport vehicles and armored vehicles. A decade ago, they participated in an oil analysis program as a means to determine lubricant and machinery condition with emphasis on reducing operating costs and improved equipment readiness. Five years ago, they cancelled their participation in the Navy Oil Analysis Program (NOAP) because the response time between...
Large City Fleet Saves $2M Using Oil Analysis to Extend Oil Drain Intervals - Case study
Condition-based maintenance saves time and money and increases productivityA large municipality in the northwestern United States operates over 1.700 vehicles and over 3.000 pieces of motorized equipment ranging from riding lawn mowers to bulldozers Oil changes constitute a major expense. For example, the 500 heavy duty trucks in its fleet previously had their oil changed every 2,500 miles at a cost of around $400 per change. Assuming that each truck is driven 40.000 miles per year, total oil changes on these...
In-House Oil Analysis Lab Saves Gold Mine Millions in Downtime, Repair and Replacement Costs
A low-grade surface mining operation depends upon huge and expensive equipment such as Hitachi 5500 shovels and Caterpillar 793 haul trucks. Oil analysis is essential to identify problems so they can be corrected before they cause equipment to go down for major repairs. In the past, a multinational mining firm sent samples to an outside lab for analysis but the cost of this approach limited the number of samples that could be analyzed. In addition, the four-day lead time to receive the results created the risk...
How Gas Analyzers Can Benefit the Automotive Industry
Emissions standards imposed upon auto engineering firms in the US could be set to change, as the Environmental Protection Agency reviews the current standards which have been in place since 2012. The EPA are considering redressing the greenhouse gas emissions standards for light-duty vehicles due for production in the model years 2022—2025, citing changing economic circumstances as the reason behind the potential shift. Automakers are divided as to the environmental and commercial impact of rolling back...
Using a Digital Cone Penetrometer to Locate Clandestine Grave Sites
AbstractLaw enforcement officials face the problem of locating suspected burial sites connected to criminal activity. Two case studies describe the collection of soil compaction data and subsequent analysis to locate a test burial at a research site. Forensic scientists use the RockWorks software from RockWare, Inc. to analyze the data and display three-dimensional views of the relative compaction logs at the sampling locations, interpolated compaction for the entire project area, 3D fence diagrams, interpolated...