REMOVAL OF HEAVY METAL IONS USING PRISTINE AND FUNCTIONALIZED PRISTINE ZEOLITE: A REVIEW

• Main Author: Ihsan Solihin, Khairul
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/52283
• Institution: Institut Teknologi Bandung

Environmental pollution is a problem that always appears, even common, nowadays. Heavy metal is one of pollution that polluted the environment. Removal of heavy metal using adsorption method was the most effective and efficient because of its low cost and easy to do. Zeolite is one of the most used adsorbent by researcher because it’s cheap, abundant in reserve, while also have high selectivity for heavy metal. Zeolites have three dimensional frameworks consist of SiO4 tetrahedra and AlO4 tetrahedra. Within the three dimensional framework, Al3+ ion replace Si4+ ion using isomorphous replacement, causing negatively charge in the structure. Hence, making the structure attract cation, such as alkaline and alkaline earth metals, and ammonium. These cations can be exchanged with heavy metal ion in polluted aqueous solution. In this manuscript, the adsorption capacity of heavy metal ion using pristine and modified pristine zeolite is studied. Some of the modifier used is hexadecyltrimethylammonium (HDTMA), surfactant Triton x-100, and chitosan. There are some general factors that affect the value of adsorption capacity such as pH of the solution, amount of the sorbent, initial concentration of sorbate, temperature of the adsorption and contact time. In pristine zeolite, there are also extra factor contributing to adsorption capacity such as Si/Al ratio, specific surface area (SSA), cation exchange capacity (CEC), and the pre-treatment of the zeolite before using. Those factors contributed to adsorption capacity of the modified pristine zeolite. Nevertheless, the modifier used is also contributing to the adsorption capacity of modified pristine zeolite. Adsorption isotherm of pristine zeolite generally follow Langmuir model, while for modified pristine zeolite it is depends on the modifier. Both adsorption kinetics and thermodynamic show similarity for pristine and modified pristine zeolite, adsorption kinetics show that both follow pseudo second-order rule while adsorption thermodynamics acquire ?G value is negative, ?S value is positive and ?H value is vary.