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Trapping the lead ion in multi-components aqueous solution by natural clinoptilolite
Yu Fei Tao1, Yue Qiu, Shu Yu Fang
1Key Laboratory of Mesoscopic Chemistry of MOE, College of Chemistry and Chemistry Engineering, Nanjing University, Nanjing 210093, China.
Natural clinoptilolite effectively adsorbs lead (Pb2+) ions from complex solutions. This zeolite shows superior Pb2+ capture capacity and selectivity compared to other materials, indicating its potential for environmental remediation.
Area of Science:
- Environmental Science
- Materials Science
- Chemistry
Background:
- Lead (Pb2+) contamination is a significant environmental concern.
- Effective removal of heavy metals from complex aqueous matrices remains challenging.
Purpose of the Study:
- To evaluate the selective adsorption of Pb2+ by natural clinoptilolite.
- To compare clinoptilolite's performance against zeolite NaZSM-5 and activated carbon.
- To assess the adsorption mechanism and toxicity of clinoptilolite.
Main Methods:
- Adsorption experiments were conducted in a complex aqueous solution at pH 1.2 and 37°C.
- Tested clinoptilolite, zeolite NaZSM-5, and activated carbon for Pb2+ adsorption capacity.
- Investigated the effects of solid-liquid ratio, initial Pb2+ concentration, and competing substances.
- Analyzed adsorption equilibrium, Gibbs energy change, selectivity, and cytotoxicity.
Main Results:
- Clinoptilolite achieved the highest Pb2+ adsorption capacity (7 mg/g), outperforming other zeolites and activated carbon.
- Adsorption equilibrium was reached within 2 hours.
- The ion-exchange process for Pb2+ by clinoptilolite is spontaneous and selective.
- Clinoptilolite demonstrated low toxicity to RAW264.7 cells.
Conclusions:
- Natural clinoptilolite is a highly effective and selective adsorbent for Pb2+ removal from complex solutions.
- Clinoptilolite offers a promising, environmentally friendly solution for lead remediation.
- The material exhibits favorable adsorption kinetics and a spontaneous, energetically favorable ion-exchange mechanism.
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