摘要 Contamination of water with arsenic has received attention as a global problem in recent years.In this study,wheat bran was modified by chemicals and utilized as a low-cost adsorbent to remove As(Ⅴ) from aqueous solutions.Batch experiments were carried out to study the effect of various experimental parameters such as initial solution pH,contact time,initial As(Ⅴ) concentration,adsorbent dosage and co-existing anionic component on As(Ⅴ) adsorption,and the optimal condition was selected.The results show that the removal percentage of As(Ⅴ) could be over 95 % in the conditions of adsorbent dosage 5.0 g/L,initial solution pH 4.0~8.0,and contact time 1 h.Under the experimental conditions,phosphate and silicate causes greater decrease in arsenate removal percentage among the anions,and sulfate has almost no effect on the adsorption of arsenate.Kinetic studies show that the As(Ⅴ) adsorption process obeyed pseudosecondorder rate equation.The applicability of the Langmuir and Freundlich models for the data was tested.Both the models adequately describe the experimental data of the adsorption of As(Ⅴ).The maximum adsorption capacity calculated from the Langmuir model is 22.65 mg/g for As(Ⅴ).The study has shown that the effectiveness of modified wheat bran in the removal of As(Ⅴ) from aqueous solutions.
基金资助: supported by the National Natural Science Foundation of China(41373127，41773136)
作者简介: YAO Shu-hua,born in 1967,female,China,professor,Doctor,engined in research of environmental pollution control.
引用本文:
YAO Shu-hua, MA Xi-chun, WANG Bai-yi, SHI Zhong-liang. Adsorption Removal of Arsenic from Aqueous Solutions by Chemically Modified Wheat Bran[J]. 沈阳化工大学学报, 2018, 32(2): 97-106.
