Filtering and Washing Solids

Open paper to make a cone, place in funnel, moisten, and fit 

Procedures for gravity filtration are illustrated in FIGURE 1.2. Support the funnel on an iron ring attached to a ring stand, and place a beaker under the funnel so that the stem of the funnel touches the side of the beaker. Pour the suspension onto the filter paper. It is best to pour down a glass rod held in a vertical position against the lip of the beaker with its lower end close to the filter. Never fill the filter with liquid up to the top of the paper. Use a stirring rod or rubber policeman, if 

If you are directed to wash impurities from the residue on the filter paper, add the washing solvent first to the original beaker and then onto the filter paper so as to remove last traces of solid from the beaker. Swirl the filter assembly to cause intimate contact with the residue, and allow each portion of the washing solvent to drain before adding the next. Remove the filter paper and residue after first lifting one edge of the filter paper with a spatula. 

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SBA-15 materials were prepared according to the procedure reported by Stucky and coworkers [1]. In order to prepare materials with different textural properties, the SBA-15 was synthesized at 80 °C and 100 °C [8]. Filtered and washed solids were dried for 24 hours at ambient temperature and calcined in air at 550 °C for 6 hours. 

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