The study in Environmental Science and Technology is specifices a research project and might not have resulted in a practical application for everyday use. The process of using cabbage to remove heavy metals from water could involve several steps, but I'll provide a general outline based on the information you provided:

Note: This is a hypothetical outline and not a recommended or verified procedure. If you're looking for effective methods of water purification, it's best to consult experts in the field and rely on established water treatment techniques.

Hypothetical Steps to Use Cabbage for Heavy Metal Absorption:

1. Selection of Cabbage: Choose fresh cabbage leaves that are clean and free from any visible damage or contamination.
2. Preparation of Cabbage Leaves: Wash the cabbage leaves thoroughly to remove dirt and debris. Pat them dry gently.
3. Preparation of Water: Prepare a container of water containing heavy metals. The type and concentration of heavy metals in the water would determine the feasibility of using cabbage for absorption.
4. Cabbage Leaf Immersion: Immerse the clean cabbage leaves into the contaminated water. Ensure that the leaves are fully submerged.
5. Contact Time: Allow the cabbage leaves to stay in contact with the water for a specified period. The study might provide information on the optimal contact time required for effective absorption.
6. Observation and Analysis: After the specified contact time, remove the cabbage leaves from the water. Analyze the water to assess any changes in heavy metal concentrations.
7. Measurement of Heavy Metals: Test the water before and after cabbage leaf immersion to measure the concentration of heavy metals. This could involve using specialized equipment or testing kits for heavy metal analysis.
8. Evaluation of Results: Compare the heavy metal concentrations in the water before and after cabbage leaf immersion. Determine if there has been a noticeable reduction in heavy metal levels.
9. Repeat Testing: Perform multiple rounds of testing using fresh cabbage leaves to confirm the results and assess consistency.

It's important to reiterate that the process outlined above is speculative and not based on a verified or recommended method. The effectiveness of using cabbage to remove heavy metals from water would depend on various factors, including the types of heavy metals present, the concentration of contaminants, the specific properties of cabbage, and the overall feasibility of this approach.

For practical and reliable water purification methods, it's recommended to consult with experts in the field of environmental science and water treatment, as well as refer to established water treatment technologies and guidelines.