化工进展 ›› 2022, Vol. 41 ›› Issue (12): 6489-6499.DOI: 10.16085/j.issn.1000-6613.2022-0445

• 材料科学与技术 • 上一篇    下一篇

酸改性猪粪生物炭的制备及其对直接红23染料的吸附性能

江汝清1,2(), 余广炜1(), 王玉1,2, 黎长江1, 邢贞娇1   

  1. 1.中国科学院城市环境研究所城市污染物转化重点实验室,福建 厦门 361021
    2.中国科学院大学,北京 100049
  • 收稿日期:2022-03-22 修回日期:2022-04-18 出版日期:2022-12-20 发布日期:2022-12-29
  • 通讯作者: 余广炜
  • 作者简介:江汝清(1996—),女,硕士,研究方向为固废处置。E-mail:rqjiang@iue.ac.cn
  • 基金资助:
    中国科学院A类战略性先导科技专项(XDA23020504);国家重点研发计划(2020YFC1908904);福建省自然科学基金(2019J01135)

Preparation of acid-modified pig manure biochar and its adsorption performance on Direct Red 23

JIANG Ruqing1,2(), YU Guangwei1(), WANG Yu1,2, LI Changjiang1, XING Zhenjiao1   

  1. 1.Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-03-22 Revised:2022-04-18 Online:2022-12-20 Published:2022-12-29
  • Contact: YU Guangwei

摘要:

以直接红23染料(DR23)溶液模拟印染废水,对比分析了酸改性前后猪粪生物炭对DR23的吸附特性与机理。通过静态吸附实验考察了DR23溶液的pH、初始浓度、吸附时间、吸附温度、吸附剂添加量等条件对吸附效果的影响,并确定了该吸附过程的吸附动力学和吸附等温线。研究发现,相比于未改性生物炭(PMB),酸改性后生物炭(PMBacid)结构变得疏松多孔,表面官能团丰富,表现出更优的脱色性能,对DR23的吸附去除率最高可达96.10%,最大饱和吸附量为111.51mg/g,且在经过3次循环再生后,PMBacid对DR23的去除率仍可达到88.31%;此外,pH对PMBacid的脱色吸附性能影响较小。PMBacid对DR23的吸附是一个受反应速率和扩散控制的复杂过程,符合于伪二级动力学模型和Langmuir等温吸附模型;PMBacid对DR23的吸附机理取决于吸附剂的物理化学性质,其孔结构及各官能团通过不同的机制参与了生物炭对DR23的吸附过程。

关键词: 猪粪, 生物炭, 酸改性, 吸附, 直接红23染料

Abstract:

Direct Red 23 (DR23) solution was used to simulate dye wastewater, and the adsorption characteristics and mechanism of pig manure biochar before and after acid modification were compared. The influence of pH, initial concentration, adsorption time, adsorption temperature and the amount of adsorbent on the adsorption effect were investigated by static adsorption experiments, and the adsorption kinetics and adsorption isotherms were determined. It is found that compared with unmodified biochar (PMB), acid-modified biochar (PMBacid) exhibits better decolorization performance with porous structure and rich surface functional groups. The maximum adsorption removal rate of DR23 is 96.10%, the maximum saturated adsorption capacity is 111.51mg/g, and the removal rate of DR23 by PMBacid can still reach 88.31% after three cycles of regeneration. In addition, pH value has little influence on the adsorption performance of PMBacid. The adsorption of DR23 by PMBacid is a complex process controlled by reaction rate and diffusion, which fits the pseudo-second-order kinetic model and Langmuir isothermal adsorption model. The adsorption mechanism of biochar for DR23 depends on the physicochemical properties of the adsorbent, and its pore structure and functional groups participate in the adsorption process of biochar for DR23 through different mechanisms.

Key words: pig manure, biochar, acid modification, adsorption, Direct Red 23

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