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石在从废水中去除多元重金属污染物时的性能

Natalie Finish¹, Pia Ramos¹, Eitan J C Borojovich²

¹Chemical Engineering Department, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel.

Journal of hazardous materials

|June 14, 2023

概括

合成的化石13X和4A显示出比天然的化石更高的重金属去除效率. (Pb²⁺) 和 (Cr³⁺) 离子在合成石上表现出最强的吸附.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
化学化学化学

背景情况:

重金属污染对环境和健康构成重大风险.
离子交换吸附剂,特别是热质,对于从废水中去除有毒金属离子至关重要.
了解多种重金属的同时吸附是有效废水处理的关键.

研究的目的:

研究六种有毒重金属 (Cd2+,Cr3+,Cu2+,Ni2+,Pb2+,Zn2+) 通过合成 (13X,4A) 和天然 (clinoptilolite) 热石的同时吸附.
为了比较吸附效率,等热度和不同热带石的动态,以去除重金属.
分析所研究的热石的吸附亲和力和再生能力.

主要方法:

同时吸附实验使用六种重金属离子的等分混合物.
使用诱导合等离子体 - 光学发射光谱法 (ICP-OES) 分析吸附异热和平衡动态.
使用能量分散式X射线光 (EDXRF) 进行补充元素分析.
使用3M KCl化溶液进行再生研究.

主要成果:

与克林诺皮托利特 (0.12 mmol/g) 相比,合成化物13X和4A的吸附能力显著更高 (高达2.9和1.65 mmol/g),比克林诺皮托利特 (0.12 mmol/g) 高.
(Pb²⁺) 和 (Cr³⁺) 离子对这两种合成热石表现出最强的亲和力.
对于13X和4A化物,吸附等温体表现出明显的最大值,较弱的吸附离子在较高的总度下显示出减少的吸附.
用3M KCl再生导致每个循环后吸附能力大幅下降.

结论:

合成的化石,特别是13X,在同时去除多种重金属方面比天然的化石更有效.
吸附行为受到金属离子特性和热带石结构的影响,其中Pb2+和Cr3+被优先吸附.
再生过程显著影响着热石的吸附能力,这表明在没有性能恢复的情况下重复使用的限制.

关键词:

吸附方式是异热的.在Faujasite的网站上分子子分子子有毒的水污染物有毒的水污染物

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