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Related Experiment Video

Updated: Apr 3, 2026

Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method

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The rectorite/carbon composites: Fabrication, modification and adsorption.

Zhitao Feng¹, Dan Liu², Xiaofei Ma¹

¹Chemistry Department, School of Science, Tianjin University, Tianjin 300072, China.

|September 25, 2015

Summary

Rectorite/carbon composites (RECCs) and modified RECCs (RECCXs) effectively adsorb Pb(2+). RECCXs demonstrate superior adsorption capacity due to xanthate groups, offering a promising solution for lead removal.

Keywords:

Adsorption Hydrothermal process Modification Rectorite

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Area of Science:

Materials Science
Environmental Chemistry
Nanotechnology

Background:

Rectorite (REC) is a clay mineral with potential for adsorption.
Developing efficient adsorbents for heavy metal removal is crucial for environmental protection.

Purpose of the Study:

To synthesize and characterize rectorite/carbon composites (RECCs) and their modified form, RECC xanthate (RECCX).
To investigate the adsorption performance of RECC and RECCX for Pb(2+) removal from aqueous solutions.

Main Methods:

Hydrothermal carbonization of starch using REC as a template to form RECCs.
Modification of RECCs with carbon disulfide (CS2) to yield RECCX composites.
Batch adsorption experiments to study Pb(2+) removal kinetics and isotherms.

Main Results:

RECC and RECCX exhibited enhanced Pb(2+) adsorption compared to pristine REC.
Oxygen-containing groups in RECC and chelation with xanthate groups in RECCX significantly improved adsorption capacity.
Maximum adsorption capacities reached 225.7 mg/g for RECC and 431.0 mg/g for RECCX.
Adsorption data fitted well with pseudo-second-order kinetics and Langmuir isotherm models.
RECCX composites showed excellent regeneration efficiency using ethylenediaminetetraacetic acid disodium salt (EDTA).

Conclusions:

RECC and RECCX are effective adsorbents for Pb(2+) removal.
The synergistic effect of rectorite, carbon layers, and xanthate groups in RECCX contributes to its high adsorption capacity.
RECCX presents a competitive and regenerable adsorbent for treating lead-contaminated water.