Dalam industri tekstil, pencelup digunakan untuk mewarna bahan tekstil seperti kapas dan poliester. Proses pencelupan menyebabkan pencemaran air melalui pembuangan pewarna ke dalam sumber air. Penjerapan karbon teraktif adalah satu kaedah yang berkesan untuk menyingkirkan pewarna. Dalam kajian ini, karbon teraktif berasaskan sisa hampas kelapa kering telah digunakan untuk menyingkirkan metelina biru (MB). Penyediaan karbon teraktif berasaskan hampas kelapa kering (KTHKK) melalui proses penyinaran gelombang mikro di bawah aliran karbon dioksida (CO2). Keadaan penyediaan optimum didapati pada kuasa radiasi dan masa radiasi masing-masing pada 440 watt dan 4 minit yang telah menghasilkan penyingkiran MB sebanyak 84.02%. KTHKK yang dioptimumkan mempunyai luas permukaan BET, luas permukaan liang meso, isipadu liang dan kandungan karbon tetap masing-masing pada 237.79 m2/g, 117 m2/g, 0.1019 cm3/g dan 51.21%. Kesan kepekatan awal pencelup (25-300mg / L) dan masa hubungan (0-24 jam) telah dinilai. Penjerapan MB pada KTHKK telah meningkat apabila kepekatan awal pencelup dan masa hubungan meningkat. Model Freundlich adalah model yang paling sesuai untuk data keseimbangan penjerapan MB sementara model pseudo tertib kedua adalah yang terbaik untuk data kinetik penjerapan pewarna MB oleh KTHKK. Mekanisme untuk proses penjerapan ditentukan dari model penyebaran antara zarah.
_______________________________________________________________________________________________________
In textile industry, dyes are used for coloring textile material such as cotton and polyester. Dyeing process created water pollution by disposal of dye into water resources. Activated carbon adsorption is one of efficient method for the removal of dye. In this study, desiccated coconut residue based activated carbon (DCRAC) was prepared for methylene blue (MB) removal. The preparation of desiccated coconut residue activated carbon was prepared via through microwave irradiation with under flow of carbon dioxide (CO2). The optimum preparation conditions of radiation power and radiation time were determined for DCRAC at 440 watt and 4 minutes respectively which resulted MB dye removal of 84.02%. The optimized DCRAC has BET surface area, mesopore surface area, pore volume and fixed carbon content of 237.79 m2/g, 117.91 m2/g, 0.1019 cm3/g and 51.21% respectively. The effect of initial dye concentration (25-300 mg/L) and contact times (0-24 hours) were evaluated. Adsorption of MB on DCRAC was increased as the initial dye concentration and contact time increase. Freundlich isotherm model was the best fitted model for MB adsorption equilibrium while pseudo second-order was the best for kinetic data for MB dye adsorption onto DCRAC. The mechanism of the adsorption process was determined from the intraparticle diffusion model.
Activated carbon adsorbent from desiccated coconut residue for methylene blue dye removal / Nadzirah Shahrudin