EFFECT OF Fe3+ LOADING BY DIRECT HYDROTHERMAL TECHNIQUE INTO RH-MCM-41 FOR ARSENATE REMOVAL

摘要

Agrowaste of rice husk (RH) was modified for mesoporous molecular sieves, MCM-41. The arsenate adsorption by an adsorbent produced by loading of Fe 3+ into RH-MCM-41 using the direct hydrothermal technique (DHT) was investigated. Studied affecting factors on arsenate adsorption capacity were Fe 3+ content in RH-MCM-41, contact time, pH solution, and initial arsenate concentration. It was found that Fe-RH-MCM-41 at the mole ratio Si/Fe of 10 gave the highest adsorption capacity. The arsenate adsorption reached equilibrium within 4 h. The adsorption capacity of Fe-RH-MCM-41 (DHT-10) was affected by the initial pH value and the initial arsenate concentration. The adsorption capacity was highest at pH 3 and decreased with increasing in the pH solution value. Langmuir model was fit well for arsenate adsorption isotherm. The maximum adsorption capacity for arsenate was 1,111 μg/g.