工业水处理 ›› 2026, Vol. 46 ›› Issue (2): 91-101. doi: 10.19965/j.cnki.iwt.2025-0215

• 试验研究 • 上一篇    下一篇

混凝土细粉的热改性及改性产物对废水中砷的吸附性能

方莹1(), 文祝1, 杜娜2   

  1. 1. 宜宾职业技术学院建筑与环境学院,四川 宜宾 644003
    2. 山东景程环境工程有限公司,山东 潍坊 262200
  • 收稿日期:2025-06-25 出版日期:2026-02-20 发布日期:2026-03-03
  • 作者简介:

    方莹(1987— ),硕士,讲师,E-mail:

  • 基金资助:
    宜宾职业技术学院博士科研启动经费项目(ybzysc22bk04); 四川省教育信息技术研究院“十四五”规划课题项目(DSJ2022286)

Thermal modification of concrete fine powder and the adsorption performance of modified products on arsenic in wastewater

Ying FANG1(), Zhu WEN1, Na DU2   

  1. 1. College of Architecture and Environment, Yibin Vocational and Technical College, Yibin 644003, China
    2. Shandong Jingcheng Environmental Engineering Co. , Ltd. , Weifang 262200, China
  • Received:2025-06-25 Online:2026-02-20 Published:2026-03-03

摘要:

矿山开采和金属冶炼产生了大量的含砷废水,造成了严重的环境污染。以混凝土细粉(WCP)为原料通过锻烧改性制备了热改性混凝土细粉吸附剂(TWCP),考察了热改性温度、体系初始pH和共存离子对TWCP吸附废水中砷性能的影响,通过XRD、FT-IR、SEM和XPS等表征手段和顺序提取技术分析了TWCP对砷的吸附机制。结果表明,在热改性温度250 ℃下制备的TWCP对砷表现出优异的吸附性能,理论最大吸附量为31.92 mg/g,Cl-和PO4 3-等阴离子共存抑制了吸附反应的进行。TWCP对砷的吸附过程符合Langmuir等温吸附模型,以化学吸附为主,吸附过程为放热反应。TWCP对砷的吸附去除包含3方面机制,分别为碱性条件下砷和Ca2+生成Ca-As沉淀,SO4 2-和CO3 2-与砷发生离子交换,AlOOH和FeOOH与砷发生络合作用。顺序提取结果表明,酸性条件下TWCP对砷的吸附机制以离子交换为主,碱性条件下以化学沉淀为主。

关键词: 混凝土细粉, 吸附剂, 热改性, 含砷废水, 吸附机制

Abstract:

Mining and metal smelting have produced a large amount of arsenic-containing wastewater, causing serious environmental pollution. Thermally modified concrete fine powder(TWCP) adsorbent was prepared by calcination modification using concrete fine powder(WCP) as raw material. The effects of thermal modification temperature, initial pH of the system and coexisting ions on the performance of TWCP adsorption of arsenic in wastewater were investigated. The arsenic adsorption mechanism of TWCP was analyzed by XRD, FT-IR, SEM and XPS characterization methods and sequential extraction technology. The results showed that TWCP with thermal modification temperature of 250 ℃ showed excellent arsenic adsorption performance, and the theoretical maximum adsorption capacity was 31.92 mg/g. The coexistence of anions such as Cl- and PO4 3- inhibited the adsorption process. The adsorption process of arsenic by TWCP conformed to the Langmuir isothermal adsorption model, which was dominated by chemical adsorption, and the adsorption process was an exothermic reaction. The mechanism of arsenic adsorption by TWCP included the formation of Ca-As precipitate by arsenic and Ca2+ under alkaline conditions, ion exchange between SO4 2- and CO3 2- with arsenic, complexation between AlOOH and FeOOH with arsenic. The results of sequential extraction showed that ion exchange was dominant under acidic conditions, and chemical precipitation was dominant under alkaline conditions.

Key words: concrete fine powder, adsorbent, thermal modification, arsenic wastewater, adsorption mechanism

中图分类号: