Removal of As(V) in the presence of Cr(VI) in contaminated water from the Bajio region of Mexico using ferrihydrite-functionalized graphene oxide (GOFH): A case study

IF 5.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Emerging Contaminants Pub Date : 2024-02-28 DOI:10.1016/j.emcon.2024.100312

D.R. Joya-Cárdenas , J.P. Rodríguez-Caicedo , M.A. Corona-Rivera , N. Saldaña-Robles , C.E. Damián-Ascencio , A. Saldaña-Robles

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Abstract

The presence of heavy metals such as arsenic (As) and chromium (Cr) can be considered one of the most toxic heavy metals. This study aims to develop and evaluate a graphene oxide (GO) based material functionalized with ferrihydrite for the removal of As(V) in the presence of Cr(VI). The adsorbent ferrihydrite-functionalized graphene oxide (GOFH) was characterized by SEM, FTIR, XRD, XPS, surface charge, BET and TGA. Individual adsorption capacities for As(V) and Cr(VI) were 160 and 66 mg g⁻¹ respectively at pH 4 and 298 K, fitting the Langmuir model. In binary systems, GOFH adsorbed As(V) with an adsorption capacity of 137 mg g⁻¹ in the presence of 20 mg L⁻¹ Cr(VI) at room temperature. Thermodynamic analysis revealed an exothermic and spontaneous process. Additionally, GOFH effectively removed several coexisting anions from groundwater, including SO₄²⁻, CO₃²⁻ and Cl⁻. This work evidences the potential of GOFH for competitive adsorption of priority pollutants from complex matrices. The GOFH material represents a technically and economically viable technology for application in groundwater decontamination, as it requires inexpensive precursors and ambient conditions during synthesis and operation.

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使用铁水酸盐功能化氧化石墨烯 (GOFH) 去除墨西哥巴希奥地区受污染水体中存在六价铬的 As(V)：案例研究

砷（As）和铬（Cr）等重金属被认为是毒性最强的重金属之一。本研究旨在开发和评估一种以氧化石墨烯（GO）为基础、用铁酸盐功能化的材料，用于去除存在六价铬的砷(V)。研究人员通过扫描电镜、傅立叶变换红外光谱、X 射线衍射、XPS、表面电荷、BET 和热重分析对功能化铁酸盐氧化石墨烯（GOFH）吸附剂进行了表征。在 pH 值为 4 和 298 K 的条件下，GOFH 对 As(V) 和 Cr(VI) 的单个吸附容量分别为 160 和 66 mg g-1，符合 Langmuir 模型。在二元体系中，GOFH 在室温下吸附 20 mg L-1 Cr(VI)的 As(V)，吸附容量为 137 mg g-1。热力学分析表明这是一个自发的放热过程。此外，GOFH 还能有效去除地下水中的几种共存阴离子，包括 SO42-、CO32- 和 Cl-。这项工作证明了 GOFH 在竞争性吸附复杂基质中的重点污染物方面的潜力。由于 GOFH 材料在合成和运行过程中需要廉价的前体和环境条件，因此它在地下水净化方面的应用在技术和经济上都是可行的。

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来源期刊

Emerging Contaminants Medicine-Public Health, Environmental and Occupational Health

CiteScore

10.00

自引率

6.70%

发文量

审稿时长

44 days

期刊介绍： Emerging Contaminants is an outlet for world-leading research addressing problems associated with environmental contamination caused by emerging contaminants and their solutions. Emerging contaminants are defined as chemicals that are not currently (or have been only recently) regulated and about which there exist concerns regarding their impact on human or ecological health. Examples of emerging contaminants include disinfection by-products, pharmaceutical and personal care products, persistent organic chemicals, and mercury etc. as well as their degradation products. We encourage papers addressing science that facilitates greater understanding of the nature, extent, and impacts of the presence of emerging contaminants in the environment; technology that exploits original principles to reduce and control their environmental presence; as well as the development, implementation and efficacy of national and international policies to protect human health and the environment from emerging contaminants.