FABRICATION OF HYDROTALCITE AND LDH MGAL MODIFIED CARRAGEENAN ADSORBENTS FOR ADSORPTION OF COPPER METAL IONS

• Main Author: Nurul Azizah, Rizqie
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71447
• Institution: Institut Teknologi Bandung

Indonesia has various industries that can produce heavy metals, such as industrial waste from the perk industry which can produce a heavy metal concentration of copper (Cu) of 84 ppm, far exceeding the Minister of Environment's decision of a maximum of 2 ppm. The adsorption method is one way to reduce the concentration of heavy metals in waste. Carrageenan, hydrotalcite and Layered Double Hydroxides (LDH) MgAl can be used as carrageenan adsorbents with modifications by mixing with hydrotalcite and LDH MgAl for application of adsorption of heavy metal copper (Cu) ions. The adsorbent was prepared with various concentrations of hydrotalcite and LDH MgAl (w/v)% 0.05, 0.075, and 0.1 and various concentrations of carrageenan (w/v)% 0.8 and 1.3, using freeze thaw and freeze dry methods. Evaluation of surface morphology, structure, and functional groups was carried out using Scanning Electron Microsope (SEM), X-Ray Diffraction (XRD), and Fourier Transform Infrared Spetroscopy (FTIR). The Cu heavy metal absorption test using carrageenan, hydrotalcite, and hydrotalcite modified carrageenan and LDH MgAl adsorbents was carried out by measuring changes in Cu heavy metal concentrations using Atomic Absorption Spectroscopy (AAS). LDH MgAl modified carrageenan adsorbent has a higher adsorption capacity than hydrotalcite modified carrageenan. The adsorbent with carrageenan concentration of 1.3% and LDH MgAl 0.1% had the largest adsorption capacity value of 36 mg/g. Increasing the concentration of carrageenan from 0.8% to 1.3% can increase the absorption efficiency and adsorption capacity. Increasing hydrotalcite concentration from 0.05% to 0.1% had no significant effect. Increasing the concentration of LDH MgAl from 0.05% to 0.1% at 1.3% carrageenan can significantly increase the value of absorption efficiency and adsorption capacity.