Nitrogen modified graphene nanowalls for retrieval of trace level cerium from aqueous medium

Q1 Environmental Science

Environmental Nanotechnology, Monitoring and Management Pub Date : 2024-07-15 DOI:10.1016/j.enmm.2024.100983

Vangala Sri Datta Chaitanya , P.A. Manojkumar , G. Mangamma , Gomathi Natarajan , G. Srinivasa Rao , C.P. Kaushik

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Abstract

Removal of cerium from environmental and aqueous streams is essential in waste water rejuvenation processes. Nitrogen modified graphene nano walls (N-GNWs) have shown ultra-high sorption efficiency of trivalent cerium from aqueous medium (K_d > 2 × 10⁷) and a large sorption capacity of ∼ 2500 mg/g is achieved. N-GNWs were deposited on carbon paper substrate using PECVD technique. The three-dimensional nature of N-GNWs are revealed from high resolution FESEM images. Raman spectroscopic studies have shown that GNWs are defective and possess a few layer graphene like structure. Secondary Ion Mass Spectroscopic studies of the Ce sorbed N-GNWs and optical emission spectroscopy of the residual solution confirm the sorptive retrieval of cerium. Visual Minteq based ionization model is introduced to explain high (>90 %) sorption of Ce at pH≥7 and the mechanistic aspects of sorption for standard Cerium solution is discussed. The sorption involves attachment of cerium hydroxyl ions to the active cites on the sorbent surface.

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氮修饰石墨烯纳米壁用于从水介质中回收痕量铈

在废水再生过程中，从环境和水流中去除铈至关重要。氮修饰石墨烯纳米壁（N-GNWs）对水介质中的三价铈具有超高的吸附效率（Kd > 2 × 107），吸附容量高达 2500 mg/g。N-GNW 采用 PECVD 技术沉积在碳纸基底上。高分辨率的 FESEM 图像揭示了 N-GNW 的三维性质。拉曼光谱研究表明，GNWs 是有缺陷的，具有类似石墨烯的几层结构。对吸附了铈的 N-GNWs 进行的二次离子质谱研究和对残留溶液进行的光发射光谱研究证实了铈的吸附回收。介绍了基于 Visual Minteq 的电离模型，以解释在 pH≥7 时铈的高吸附率（90%），并讨论了标准铈溶液的吸附机理。吸附涉及羟基铈离子附着到吸附剂表面的活性氧上。

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来源期刊

Environmental Nanotechnology, Monitoring and Management Environmental Science-Water Science and Technology

CiteScore

13.00

自引率

0.00%

发文量

132

审稿时长

48 days

期刊介绍： Environmental Nanotechnology, Monitoring and Management is a journal devoted to the publication of peer reviewed original research on environmental nanotechnologies, monitoring studies and management for water, soil , waste and human health samples. Critical review articles, short communications and scientific policy briefs are also welcome. The journal will include all environmental matrices except air. Nanomaterials were suggested as efficient cost-effective and environmental friendly alternative to existing treatment materials, from the standpoints of both resource conservation and environmental remediation. The journal aims to receive papers in the field of nanotechnology covering; Developments of new nanosorbents for: •Groundwater, drinking water and wastewater treatment •Remediation of contaminated sites •Assessment of novel nanotechnologies including sustainability and life cycle implications Monitoring and Management papers should cover the fields of: •Novel analytical methods applied to environmental and health samples •Fate and transport of pollutants in the environment •Case studies covering environmental monitoring and public health •Water and soil prevention and legislation •Industrial and hazardous waste- legislation, characterisation, management practices, minimization, treatment and disposal •Environmental management and remediation