The design of scorodite@FeOOH core-shell materials and its stability treatment for arsenide
Source abstract
Abstract
Abstract Arsenic as a highly toxic substance must be stabilized and immobilized to avoid environmental pollution. The natural scorodite ore (FeAsO4·2H2O) is stable that originated from the arsenic oxide are encapsulated by iron oxide layer in the crystal structure of scorodite, form the similar core-shell structure. The special core-shell structure can successfully improve the stability of arsenide. In this study, the scorodite@FeOOH materials with core-shell structure were designed and synthesized by soaking the scorodite in alkaline solution. The core-shell structure was formed in 6 h with the pH range of 10.00–13.00. By analyzing the formation pathway, the arsenical ferrihydrite was formed in soaking process, meanwhile the Fe(OH)3 particles were produced, then both of them continue to grow, thus form the core-shell structure. After ageing treatment, the scorodite@FeOOH core-shell structures were formed. Toxicity Characteristic Leaching Procedure measurements were performed to evaluate the safety of this scorodite@FeOOH material in acid or alkaline solutions. The results indicated that the scorodite@FeOOH material had high stability under acid and alkaline condition. Within 10 days, the concentrations of arsenic in leaching liquid were below 0.01 mg·L−1. This stabilization result indicates the treatment way from arsenide to the stable core-shell structure is an effective strategy for arsenic immobilization.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Arsenic contamination and mitigation · Iron oxide chemistry and applications · Fluoride Effects and Removal
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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