Effect of the pH on the Cr(VI)Sorption on HDTMA-zeolites

• 作者: Jolanta Warchol Maria Chojnacka Paulina Sobolewska
• 来源期刊: 环境科学与工程:A
• 学科: 地球科学
• 关键词: Hexavalent chromium HDTMA-Br modified zeolites SORPTION FTIR SPECTRA
• 年，卷（期）: 2018,（7）
• 页码范围: 261-267
• 页数: 7页
• 分类号: X

摘要

The uptake of Cr(VI)from aqueous solutions was investigated using clinoptilolite and phillipsite rich tuffs.These minerals were modified using hexadecyltrimethyl-ammonium bromide(HDTMA-Br)and used for Cr(VI)ions removal.The physicochemical characteristics of zeolitic minerals were revealed by XRD,XRF,BET and FT-IR techniques.The concentration of Cr(VI)working solutions,Cinit ranged between 5-100 mg·L-1,were prepared by dilution of the stock solution with distilled water with pHinit adjusted to the value of 3.0 or 4.0 or 5.0.The residual concentrations of chromium in the liquid samples were analyzed by ICP-OES.The uptake capacities of modified zeolites were compared in batch sorption experiments.The comparison of the obtained data identified that efficiency of Cr(VI)sorption onto clinoptilolite is always higher than in phillipsite case.The analysis of the infrared spectra revealed that after adsorption of Cr(VI)the characteristics for HDTMA vibrations were shifted in PHI-HDTMA case,while for CLI-HDTMA the intensity of characteristics peaks decreased.