Test Method for Carbon Tetrachloride Adsorption Rate of Coal-based Granular Activated Carbon

Test Method for Carbon Tetrachloride Adsorption Rate of Coal-based Granular Activated Carbon

Coal-based granular activated carbon is a black columnar or irregular porous carbon adsorbent made from high-quality anthracite coal and tar via carbonization and activation. It is one of the most common types of coal-based activated carbon.

It features high mechanical strength, easy regeneration, large specific surface area, strong adsorption capacity and low cost. Its physical strength is no less than 90.0%, with specific surface area generally ranging from 900 to 1000 m²/g. Pores are mainly micropores below 1 nanometer with a small number of mesopores. It boasts favorable chemical stability, acid, alkali, high temperature and high pressure resistance, and can be reused after regeneration.

Test Objectives

Adsorption performance evaluationCarbon tetrachloride has similar molecular size to most organic contaminants. Its adsorption rate directly reflects micropore development degree and saturated adsorption capacity for non-polar organic pollutants such as VOCs. Higher rate means stronger adsorption capability.

Production quality controlAs a core factory inspection index for gas-phase adsorption activated carbon, this test verifies activation effect, ensures batch product compliance and realizes in-process quality management.

Application selection guidanceAdsorption requirements vary in different scenarios. The index provides reference for product selection in air purification, organic waste gas recovery, gas mask and other gas-phase treatment applications.

Environmental safety assessmentIt predicts adsorption efficiency in organic pollutant treatment projects, guarantees environmental safety and supplies technical parameters for project design.

Test Samples and Equipment

Sample: Coal-based granular activated carbon

Equipment: ST-65 Carbon Tetrachloride Adsorption Rate Tester, compliant with GB/T7702.13

Test Procedures

Sample preparationDry the test sample in an oven at 150℃ for 2 hours, then cool down to room temperature in a desiccator.

Adsorption tube pretreatmentWeigh the clean empty tube and record the mass m1. Fill the cooled carbon sample layer by layer with bed height controlled at (100±0.2) cm. Seal the tube tightly and apply vaseline to ensure air tightness.

Adsorption processFix the tube in a constant temperature water bath at 25℃. Feed stable saturated carbon tetrachloride vapor until the carbon reaches adsorption saturation with constant weight.

Final weighingTake out the tube, wipe off external condensed liquid and weigh immediately to record mass m2. Conduct blank test following identical steps and record blank mass variation m0.

Test Result

Two parallel test results are 150.5% and 150.2%. The absolute difference is 0.3%, less than the allowable 0.5%, meeting repeatability standard. The final test result is 150.4%.