摘要
制备了一种载铁(β- FeOOH)球形棉纤维素吸附剂,球珠孔隙度大,强度好,活性成分铁的载入量可高达36 0mg/mL ,(质量分数达5 0 %) ,活性好.研究表明,当铁含量为2 2 0mg/mL时,该吸附剂对As(V)的最大吸附量为1 5. 6mg/mL(33 . 2mg/g) ,Langmuir和Freundlich方程能很好地描述吸附等温线.吸附速度较快,1 0h可达到吸附平衡,吸附动力学符合Lagergren二级方程.SiO2 -3 ,SO2 -4,Cl-干扰离子均不影响砷的去除.柱吸附实验表明,空床停留时间为5 . 9min ,进水As(V)浓度为5 0 0 μg/L时,As(V)的穿透体积为5 0 0 0BV .吸附剂可以用1 . 5mol·L-1 NaOH再生,洗脱和再生效率可达90 %以上.活性成分β- FeOOH形态稳定,柱操作和再生时铁无溶出.吸附剂制备方法简单,新颖,对地下水和饮用水砷去除具有较好的应用前景.
A new adsorbent, bead cellulose impregnated with Fe oxide hydroxide (β-FeOOH) was prepared, which is porous and has excellent mechanical properties. The content of iron, the reactive center of the adsorbent was 360 mg/mL at the most(50% in mass). Batch sorption experiments show that the adsorbent had 15.6mg/mL (33.2mg/g) of As(V) maximum sorption while the iron content was 220mg/mL. The adsorbent had good kinetic property for arsenate and the adsorption equilibrium reached in 10h. The sorption kinetic data can be described by Lagergren pseudo-second order rate equation. The addition of chloride, sulfate and silicate did not affecte the arsenic adsorption. The column experiment indicated that the breakthrough bed volume was 5 000BV while influent As(V) concentration was 500μg/L and empty contact time was 5.9min. The spent adsorbent can be regenerated eluting with 1.5 mol·L -1 NaOH solutions, and the desorption and regeneration process were more than 90%. The FeOOH was chemically stable during the column adsorption and regeneration. The preparation method is simple and innovative. The adsorbent has good future applying for the arsenic removal from groundwater and drinking water.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第3期66-72,共7页
Environmental Science
基金
南开大学-天津大学联合研究项目
