改性大蒜废弃物负载型纳米零价铁对染料废水的吸附处理研究

Degradation of Methylene Blue by Nano-Zero Valent Iron Loaded Garlic Residue

摘要: 本文采用液相还原的方法，将负载有Fe(III)的大蒜废弃物用硼氢化钠溶液还原，得到负载有纳米零价铁的大蒜废弃物颗粒(CMGP-Nzvi)，用于水溶液中亚甲基蓝的降解净化。考察了吸附剂用量、目标溶液pH值、亚甲基蓝的溶度、吸附温度以及吸附时间对CMGP-nZVI吸附性能的影响规律。结果表明，采用负载有纳米零价铁的大蒜废弃物比单一的大蒜废弃物对亚甲基蓝的处理效果更加明显，即纳米零价铁的负载显著促进了吸附效果；吸附效率随着吸附剂用量的增加而增加，随着亚甲基蓝初始浓度的升高并无明显变化，随着温度的升高，吸附效率变化甚微，推测吸附降解过程主要为扩散控制所限制。

Abstract: Crushed garlic residue particles were used as the matrix material to load iron ions onto it and further subjective to the in-situ reduction by sodium borohydride in the aqueous media to produce the composite material of nanosized zero-valent iron and garlic biomass. To evaluate the adsorption behavior, methylene blue solution was used as the target solution to investigate the effect of CMGP-nZVI. Adsorbent dosage, pH value, concentration of methylene blue, adsorption temperature, and adsorption time were studied in a batch style. It was found that the adsorption efficiency of CMGP-nZVI is better than that of CMGP gel, and temperature has little effect on the adsorption rate which indicates that the activation energy of the adsorption would be quite small and so the diffusion process is probably the key step to limit the whole adsorption process.