Construction of bismuth-based porous carbon models by 3D printing technology for light-enhanced removal of chloride ions in wastewater

碳化 氯化物 纳米颗粒 材料科学 化学工程 氧化物 多孔性 废水 水溶液中的金属离子 离子 降水 碳纤维 光催化 无机化学 化学 金属 纳米技术 催化作用 有机化学 废物管理 冶金 复合材料 扫描电子显微镜 物理 气象学 复合数 工程类
作者
Haiwei Jiang,Shouqiang Huang,Hongying Lv,Dongdong Ge,Xu He,Pin Zhou,Kun Xiao,Yaheng Zhang
出处
期刊:Water Research [Elsevier BV]
卷期号:225: 119134-119134 被引量:22
标识
DOI:10.1016/j.watres.2022.119134
摘要

The bismuth oxide (Bi2O3) based chloride (Cl-) removal method is one of the chemical precipitation methods possessing good selectivity and high removal efficiency of Cl- ions, but Bi2O3 often appears in the powder form, which is difficult to be recovered for regeneration. In this work, the combination of 3D printing technology and the Bi2O3 method was explored to construct the resin model including the Bi-precursors. In the optimum carbonization process at 400 °C for 30 min, the Bi3+ ions of the Bi-precursor were reduced into the metallic Bi0 nanoparticles, whose surfaces were covered by the thin Bi2O3 layers to form the heterostructured Bi0/Bi2O3 core/shell nanoparticles with an average size of 43 nm. These Bi0/Bi2O3 nanoparticles were tightly adhered to the internal and external surfaces of the hierarchical porous carbon model (Bi-PCM), which greatly facilitated their regeneration and ensured the stable Cl- removal performance. After five cycles of Cl- removal, the chloride removal efficiency over the multiple Bi-PCMs in the dark and pH 1 conditions maintained at about 26%, which then largely increased to 63.6% with UV light irradiation. The light-enhanced mechanism was related to the improved release rate of Bi3+ ions caused by photocorrosion and the Cl• radicals produced from the holes and the •OH and O2•- radicals, which quickly reacted with Bi2O3 to form BiOCl. The construction of Bi-PCMs by using 3D printing technology provides a very promising strategy for the removal of Cl- ions from wastewater.
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