| 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 |
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| 引用本文： | 江汝清,余广炜,王玉,黎长江,邢贞娇. 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[J]. 化工进展, 2022, 41(12): 6489-6499. DOI: 10.16085/j.issn.1000-6613.2022-0445 |
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| 作者姓名： | 江汝清 余广炜 王玉 黎长江 邢贞娇 |
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| 作者单位： | 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;中国科学院大学,北京100049;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 |
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| 基金项目： | 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) |
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| 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。
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| 关 键 词： | 猪粪 生物炭 酸改性 吸附 直接红23染料 |
| 收稿时间： | 2022-03-22 |
Preparation of acid-modified pig manure biochar and its adsorption performance on Direct Red 23 |
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| JIANG Ruqing,YU Guangwei,WANG Yu,LI Changjiang,XING Zhenjiao. Preparation of acid-modified pig manure biochar and its adsorption performance on Direct Red 23[J]. Chemical Industry and Engineering Progress, 2022, 41(12): 6489-6499. DOI: 10.16085/j.issn.1000-6613.2022-0445 |
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| Authors: | JIANG Ruqing YU Guangwei WANG Yu LI Changjiang XING Zhenjiao |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | pig manure biochar acid modification adsorption Direct Red 23 |
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