Flower-clustered calcium sulfate dihydrate from salt gypsum: Synergistic templating for enhanced Cd2+ adsorption
Year: 2025
Type: article
Abstract: To address the high cost of conventional adsorbents and low surface area/porosity of traditional gypsum for aqueous Cd 2+ remediation, novel flower-clustered calcium sulfate dihydrate (FC-CSD) was synthesized from industrial salt gypsum using a polyethylene glycol (PEG)/sodium citrate (TSC)/polyacrylic acid (PAA) ternary synergistic template system. The influences of templating agent ratio, reaction temperature, reaction time and stirring rate on the morphological structure and adsorption properties of the materials were systematically investigated by one-factor experiments. The FC-CSD synthesized under the optimal process parameters (15.00 g PEG, 1.18 g TSC, 0.33 g PAA, 85 °C, 2.0 h, and 600 rpm) was a porous, three-dimensional flower-cluster structure formed by self-assembly of nanosheets, which achieved a specific surface area of 16.32 m 2 /g. The adsorption performance of FCCSD on Cd was analyzed by batch experiments. The results showed that the adsorption process of Cd 2+ was consistent with the pseudo-second-order kinetics and Langmuir model, and the theoretical maximum adsorption capacity was 20.38 mg/g. The adsorption mechanism involved ion exchange between Ca 2+ and Cd 2+ , complexation of surface functional groups and physical adsorption. FC-CSD demonstrates significant potential for heavy metal wastewater treatment and offers new strategies for solid-waste valorization and environmental remediation.
Source: Applied Surface Science
Authors: Chang Chen, Sijia Hou, Hengdiao Xu, Yanxin Chen, Shaowu Jiu, Yan Liu
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,930
Award: G125160147
OpenAlex ID: W4416055726