Lin Lu, Xu Jia-Rui, Wu Hao, Wang Chang-Hui, Pei Yuan-Sheng
Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.
Huan Jing Ke Xue. 2013 Jul;34(7):2758-65.
Effectiveness of arsenite adsorption by ferric and alum water treatment residuals (FARs) with different grain sizes was studied. The results indicated that the content of active Fe and Al, the specific surface area and pore volume in FARs with different grain sizes were in the range of 523.72-1 861.72 mmol x kg(-1), 28.15-265.59 m2 x g(-1) and 0.03-0.09 cm3 x g(-1), respectively. The contents of organic matter, fulvic acid, humic acid and humin were in the range of 46.97-91.58 mg x kg(-1), 0.02-32.27 mg x kg(-1), 22.27-34.09 mg x kg(-1) and 10.76-34.22 mg x kg(-1), respectively. Results of SEM and XRD analysis further demonstrated that FARs with different grain sizes were amorphousness. Batch experiments suggested that both the pseudo-first-order and pseudo-second-order equations could well describe the kinetics adsorption processes of arsenite by FARs. Moreover, the contents of arsenite absorbed by FARs increased with the increase of arsenite concentrations. The theoretical saturated adsorption capacities calculated from Langmuir isotherm model were in the range of 6.72-21.79 mg x g(-1). Interestingly, pH showed little effect on the arsenite adsorption capability of FARs. The capability of FARs had a close relationship with their physicochemical properties. Correlation analysis showed that the active Fe and Al contents and pore volume had major effects on the arsenite adsorption capability of FARs.
研究了不同粒径的铁和铝水处理残渣（FARs）对亚砷酸盐的吸附效果。结果表明，不同粒径FARs中活性铁和铝的含量、比表面积和孔体积分别在523.72 - 1861.72 mmol·kg⁻¹、28.15 - 265.59 m²·g⁻¹和0.03 - 0.09 cm³·g⁻¹范围内。有机质、富里酸、腐殖酸和胡敏素的含量分别在46.97 - 91.58 mg·kg⁻¹、0.02 - 32.27 mg·kg⁻¹、22.27 - 34.09 mg·kg⁻¹和10.76 - 34.22 mg·kg⁻¹范围内。扫描电子显微镜（SEM）和X射线衍射（XRD）分析结果进一步表明，不同粒径的FARs为非晶态。批量实验表明，准一级和准二级方程都能很好地描述FARs对亚砷酸盐的动力学吸附过程。此外，FARs吸附的亚砷酸盐含量随亚砷酸盐浓度的增加而增加。根据朗缪尔等温线模型计算的理论饱和吸附容量在6.72 - 21.79 mg·g⁻¹范围内。有趣的是，pH对FARs的亚砷酸盐吸附能力影响很小。FARs的吸附能力与其物理化学性质密切相关。相关性分析表明，活性铁和铝含量以及孔体积对FARs的亚砷酸盐吸附能力有主要影响。
