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The influence of sodium dodecyl sulfate adsorption capacity - activated carbon type experiment

Time:2015/11/4 6:02:09

1.1 material, reagents and equipment
Choose to anthracite coal, long flame coal, lignite and coconut shell as raw material made of four kinds of typical commodities sold activated carbon as the sorbent samples, respectively as AC - 1, AC - 2, 3, AC - AC - 4. The activated carbon samples after washing, natural drying, grinding and through 200 mesh sieve (0.074 mm), placed in a thermostatic oven, at 100 ° C temperature drying 48 h. The preparation of fine powder activated carbon to be included in the dryer. Set aside.
Main reagents: naoh (1 mol/L), sulfuric acid (0.5 mol/L), chloroform, sodium dodecyl sulfate standard solution (10.0 mg/L) and methylene blue solution (30 mg/L), sodium dihydrogen phosphate detergents (50 g/L), phenolphthalein (indicator), hitches in cable type extraction apparatus of cotton paper after chloroform extraction.
The main instruments used in the study are: ultraviolet-visible spectrophotometer (UV - 9600, Beijing Rayleigh analytical instrument company), 250 ml separatory funnel (ptfe piston), type extractor (150 ml flat bottom flask, Φ 35 x 160 mm drawn tube, serpentine condenser pipe), ultrasonic cleaning machine (KQ5200B type, kunshan ultrasonic instruments co., LTD.), constant temperature water bath oscillator (SHZ - 88 type, taicang city, jiangsu province experimental equipment factory).
1.2 characterization of activated carbon
According to GB/T7702.7-2008 and GB/T7702.6-2008 used to determine iodine adsorption value of activated carbon and methylene blue adsorption value indicators.
The Nova - 1200 type gas adsorption instrument (Quantachrome, USA) was developed for the determination of liquid nitrogen temperature activated carbon nitrogen isothermal adsorption/stripping; Calculation of total specific surface area activated carbon with BET method, and using t - plot method to calculate the pore specific surface area, subtracting the large, medium pore specific surface area; Relative pressure of 0.995 will be converted to liquid nitrogen adsorption capacity of the volume of nitrogen, which is a total entrance of activated carbon, and t - micro plot method to calculate the distributed capacitance is presupposed to large, distributed capacity.
1.3 sodium dodecyl sulfate (SDS) measurement
The quality of the current water sodium dodecyl sulfate (SDS) concentration determination method of spectrophotometry, chromatography and flow injection analysis and resonance light scattering analysis, etc. The spectrophotometry high sensitivity, stable absorbance, the interference of coexisting ions is small, and the operation is simple, raw material cost is low, is more economic and feasible method.
This study adopts the methylene blue spectrophotometric method determination in water (GB7494-37) sodium dodecyl sulfate (SDS) mass concentration.
10 take separatory funnel, configuration, respectively, 100 ml of different mass concentration of sodium dodecyl sulfate (SDS) standard solution, the pH of the solution will be dispatched to neutral. Add 25 ml methylene blue solution respectively, repeatedly with chloroform extraction, the chloroform layer out into a 50 ml volumetric flask and add chloroform to line. In the 652 - nm wavelength, and chloroform as reference fluid, the determination of 10 absorbance of the extraction solution (A), do A - rho standard curve. Apply adequate amount to test sodium dodecyl sulfate (SDS) solution, which is mixed with water to 100 ml, according to the above method measured the absorbance of the extraction solution, according to the standard curve of the mass concentration of the solution under test.
1.4 the determination of experimental conditions
For the determination of activated carbon in sodium dodecyl sulfate (SDS) adsorption isotherm, you need to determine the basic experimental conditions is the quality of the activated carbon and the ratio of solution volume. For AC - 1 sample first, explores the preliminary experiment.
The quality of the plating solution of sodium dodecyl sulfate (SDS) concentration generally between 0.5 ~ 5.0 g/L, working temperature at about 50 ° C. Preparation of mass concentration of 2 g/L sodium dodecyl sulfate (SDS) solution as a solution, respectively take 20 ml, 30 ml, 35 ml, 40 ml, 45 ml and 50 ml of the solution in six tapered bottle, add 0.2 g of AC - 1. Put six conical flask at 50 ° C under constant temperature oscillation within 24 h, the saturated adsorption, filtering, measuring the filtrate of sodium dodecyl sulfate (SDS) concentration, according to the type (1) adsorption capacity.
Calculation of adsorption capacity
Type: E for sodium dodecyl sulfate (SDS) adsorption capacity, mg/g; Rho 0 for the solution of sodium dodecyl sulfate (SDS) of the initial mass concentration, the g/L; Rho for adsorption in the filtrate after sodium dodecyl sulfate (SDS) concentration, the quality of the g/L; V is for use on sodium dodecyl sulfate (SDS) solution volume, mL; M for the quality of the activated carbon, g.
Sodium dodecyl sulfate (SDS) adsorption capacity
For sodium dodecyl sulfate (SDS) adsorption capacity along with the change of volume of solution. Figure 1 illustrates the: sodium dodecyl sulfate (SDS) adsorption capacity increased with the increase of solution volume increase sharply; When the volume of a solution, after more than 35 ml activated carbon in sodium dodecyl sulfate (SDS) adsorption capacity rate decreased gradually along with the change of solution volume; When the volume of a solution after more than 45 ml, the change of the adsorption capacity leveled off.
1.5 the determination of adsorption isotherm and drawing
Make mass concentration is 0.5, 0.5, 1.0, 3.0, 3.5, 4.0, 4.5, 5.0 g/L of sodium dodecyl sulfate (SDS) solution, calibration of its mass concentration. Respectively take quality for 0.2 g of 4 kinds of activated carbon samples in four conical flask, 35 ml, respectively, to join the same mass concentration of solution, according to the method in 1.4 4 kinds of activated carbon have been measured on the same mass concentration of sodium dodecyl sulfate (SDS) solution adsorption capacity, do parallel sample during the test. And so on, can be measured 4 kinds of activated carbon to eight different mass concentration of sodium dodecyl sulfate (SDS) solution adsorption capacity, the adsorption isotherm of the map as well.