金属改性蒸压加气混凝土及其吸附除磷研究  

Study on Preparation of Metal-modified Autoclaved Aerated Concrete and the Adsorption of Phosphorus Removal

作　　者：金歆 贾仁勇 谢小虎 方巧玲 余萌 高玉兰 JIN Xin;JIA Renyong;XIE Xiaohu;FANG Qiaoling;YU Meng;GAO Yulan(Department of Architecture and Civil Engineering,West Anhui University,Lu’an 237012,China;Anhui Gaodi Technology Co.,Ltd.,Lu’an 237012,China)

机构地区：[1]皖西学院建筑与土木工程学院,安徽六安237012 [2]安徽省高迪科技有限公司,安徽六安237012

出　　处：《环境科学与技术》2025年第4期86-94,共9页Environmental Science & Technology

基　　金：企业横向课题:蒸压加气混凝土碎料在废水除磷的应用(0045023181);污泥自动化进料填装技术和污泥微风干化技术(0045023035);皖西学院大学生创新创业训练计划项目(202410376084)。

摘　　要：双碳背景下,固废资源回用是绿色环保产业的重要领域,是全面推动绿色低碳发展的必由之路。蒸压加气混凝土碎料(AAC)回用于水污染修复具有较大的潜能。该研究采用FeAl浸渍-碱滴定-焙烧法制备改性AAC吸附剂,利用扫描电子显微镜、X射线衍射、BET比表面积测试、傅里叶变换光谱、Zeta电位仪对AAC改性前后材料进行表征,并研究其对低磷水体的吸附除磷效能。结果表明,Fe∶Al质量比为2∶1,经Ca(OH)_(2)调节的改性AAC(FeAlCa-AAC)表现最优。在反应时间1 h,投加量为0.3 g/L,对1.0 mg/L的含磷水体中磷的去除率达98.28%。批实验结果表明,磷的去除率随磷初始浓度的增加而降低,随FeAlCa-AAC投加量的增加、初始溶液pH的增大而升高。溶液中共存阴离子Cl^(-)、SO_(4)^(2-)、NO_(3)^(-)对磷的去除基本无影响,相对来说,高浓度的HCO_(3)^(-)对FeAlCa-AAC吸附除磷抑制作用较强。对吸附过程进行动力学和等温吸附模型拟合,结果表明,FeAlCa-AAC吸附除磷更符合准二级动力学方程和Langmuir等温线模型。Under the background of the“dual carbon”goal,the recycling of solid waste resources is an important field of the green environmental protection industry and a necessary path to comprehensively promote green and low-carbon development.Autoclaved aerated concrete(AAC)crushed materials have great potential for reuse in water pollution remediation.In this study,a modified AAC adsorbent was prepared by the FeAl impregnation-alkali titration-calcination method.The materials before and after AAC modification were characterized by scanning electron microscopy,X-ray diffraction,BET specific surface area test,Fourier transform infrared spectroscopy,and Zeta potential analyzer,and its performance in adsorbing and removing phosphorus from low-phosphorus water bodies was investigated.The results showed that the modified AAC(FeAlCa-AAC)adjusted with Ca(OH)_(2) exhibited the best performance when the mass ratio of Fe∶Al was 2∶1.With a reaction time of 1 hour and a dosage of 0.3 g/L,the removal rate of phosphorus in the phosphorus-containing water body with a concentration of 1.0 mg/L reached 98.28%.The results of batch experiments showed that the removal rate of phosphorus decreased with the increase of the initial phosphorus concentration,and increased with the increase of the dosage of FeAlCa-AAC and the increase of the initial solution pH.The coexisting anions Cl^(-)、SO_(4)^(2-)、NO_(3)^(-)in the solution had basically no effect on the removal of phosphorus.Relatively speaking,a high concentration of HCO_(3)^(-)had a strong inhibitory effect on the adsorption and removal of phosphorus by FeAlCa-AAC.The adsorption process was fitted with kinetic and isothermal adsorption models.The results showed that the adsorption and removal of phosphorus by FeAlCa-AAC conformed more to the pseudo-second-order kinetic equation and the Langmuir isotherm model.

关 键 词：蒸压加气混凝土 磷 吸附 资源回用 水污染修复 

分 类 号：X703.1[环境科学与工程—环境工程]