各种花园垃圾生物炭的酸盐-吸附特性和机制
Jingjing Yao1,2,3, Zhiyi Wang1,4, Mengfan Liu2,3
1Key Laboratory of Mine Ecological Effects and Systematic Restoration, Ministry of Natural Resources, Beijing 100081, China.
Materials (Basel, Switzerland)
|August 26, 2023
概括
园林废弃物生物炭有效地从废水中去除酸 (NO3−-N). 热解温度和原料类型显著影响去除效率,使用700°C的Platycladus orientalis生物炭获得最佳结果.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 废物管理 废物管理
背景情况:
- 酸盐- (NO3−-N) 污染对环境构成重大风险,特别是在城市环境中.
- 有效地处置各种花园废物仍然是可持续城市管理的一个挑战.
- 从烧化生物质中提取的生物炭为废物回收和污染物清除提供了潜在的解决方案.
研究的目的:
- 研究各种花园废物产生的生物炭在从水溶液中去除酸 (NO3−-N) 的有效性.
- 评估热解温度,原料类型和吸附条件对NO3−-N去除的影响.
- 为了确定最大NO3−-N吸附的最佳生物炭特性和操作参数.
主要方法:
- 通过在三种温度下 (300°C,500°C,700°C) 对八种不同类型的花园废物 (草,各种树枝) 的热解来生产生物炭.
- 吸附实验评估在不同pH值下NO3−-N的去除,接触时间,初始NO3−-N度和生物炭剂量.
- 动力学 (伪第一阶,伪第二阶) 和平衡 (朗慕尔,弗洛因德利希,特姆金,杜比宁-拉杜什科维奇) 模型分析.
主要成果:
- 生物炭产量在14.43%至47.09%之间,随着热解温度的提高而下降.
- 较高的pH值对NO3−-N吸附有负面影响,而较长的接触时间,增加的初始度和生物炭剂量提高了去除.
- 伪二阶动力学和朗穆尔模型最好地描述了吸附过程,Platycladus orientalis生物炭 (PO700) 在pH值为2. 2时实现了62.11%的去除和1.339 mg·g-1容量.
结论:
- 园林废弃物生物炭是从废水中去除NO3−-N的可行材料.
- 热解温度和原料选择对于优化生物炭特性和吸附性能至关重要.
- 该研究为利用花园废物衍生生物炭在可持续环境管理和废水处理中提供了理论基础.
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