纤维素纳米晶介质粘土生物复合物用于快速Cr(VI) 去除
Zilong Deng1, Zixuan Wu1, Qin Wu2
1State Key Laboratory for Pollution Control, School of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
概括
纤维素纳米晶 (CNC) 改性土 (Bt) 复合物 (CNC@Bt) 显著增强了从废水中去除 (Cr(VI)). 这种新型吸附剂为重金属整治提供了更高的效率和稳定性.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 土矿 (Bt) 是一种粘土矿物质,由于疏水性和表面积较小,其作为重金属吸附剂的有效性有限.
- (Cr) 是一种常见于工业废水中的有毒重金属污染物.
- 开发高效且具有成本效益的吸附剂对于Cr (VI) 整治至关重要.
研究的目的:
- 开发一种修饰的托尼特复合物,具有增强的Cr (VI) 吸附能力.
- 研究新型复合材料的吸附机制和性能.
- 评估改性顿石在废水处理中的实际适用性.
主要方法:
- 合成纤维素纳米晶 (CNC) 改性丁酸复合材料 (CNC@Bt).
- 描述CNC@Bt,包括特定表面积和结构分析.
- 在各种条件下进行批量吸附实验,以确定Cr (VI) 去除效率和容量.
- 动力学和同热学研究,以了解吸附机制.
主要成果:
- 与裸体Bt相比,CNC@Bt表现出更大的特定表面积和多孔结构.
- 复合材料显示出协同吸附机制,包括离子交换,键,静电相互作用和固体阻碍.
- 在20 mg/L初始度和pH值为4.0的情况下,CNC@Bt实现了92.7%的Cr (VI) 去除率,显著优于裸体Bt.
- 吸附遵循伪二次动力学和兰木尔异热模型,表明自发和内热过程.
- 在广泛的pH范围内保持了高清除效率 (>80%).
结论:
- CNC@Bt 是一种高效的吸附剂,用于去除Cr (VI),克服了裸体托尼特的局限性.
- 复合材料显示出有希望的潜力,可以快速有效地处理受Cr污染的废水.
- 增强的吸附性能和稳定性表明在环境修复工作中具有实际适用性.
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