CAS 10138-04-2 Ferric ammonium sulphate solution R2 - Analytical Products / Alfa Chemistry

CAT	APS10138042A
CAS	10138-04-2
Structure
Synonyms	Ammonium iron(III) sulfate
IUPAC Name	ammonium;ferric;disulfate
Molecular Weight	266.01
Molecular Formula	Fe.2SO4.NH4
Canonical SMILES	[NH4+].[Fe+3].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-]

Accurate Mass	265.8728
Format	Neat
Shipping	Room Temperature
Storage Conditions	Room Temperature
Subcategory	Reagents (Ph. Eur. 4.1.1.), Reagents according to pharmacopoeias
Type	Reagent

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Case Study

Ammonium Ferric Sulfate for the Preparation of Graphene Oxide-Based Composites in Dye Removal Applications

Hossain, Md Israil, et al. Journal of Materials Research and Technology 12 (2021): 1715-1727.

Ammonium ferric sulfate (AFS) plays a pivotal role in the synthesis of advanced graphene oxide-based composites for environmental remediation. The integration of AFS with graphene oxide (GO) yields GO-AFS, a composite with excellent thermal stability, rough porous morphology, and high adsorption potential toward both synthetic dyes and real tannery effluents.
1. Synthesis Process: GO was first synthesized using a Modified Hummer's method. Graphite (3 g) was oxidized in concentrated H₂SO₄ with KMnO₄ at controlled temperatures, followed by dilution, neutralization with H₂O₂, and extensive washing. In the second step, AFS (3 g) was introduced into the GO suspension at 40 °C under continuous stirring for 1 h. The mixture was further purified with dilute HCl to remove excess metal ions, washed thoroughly with water, and dried under vacuum at 70 °C to yield GO-AFS composite powder.
2. Structural Features: FTIR, XRD, SEM, and TGA analyses confirmed the incorporation of AFS into GO, leading to a stable, rough, and porous composite matrix ideal for adsorption applications.
3. Performance in Dye Removal: GO-AFS achieved near-complete (≈100%) removal of anionic dye Basic Black 7 (BB7) within 2 min at 0.1 g/L and cationic dye Acid Black 210 (AB210) within 3 min at 0.12 g/L, under optimal pH conditions. Remarkably, real tannery wastewater also reached 100% decolorization efficiency. The adsorbent demonstrated recyclability, maintaining ~95% efficiency even after three cycles.
This case highlights ammonium ferric sulfate as a critical component in the preparation of GO-based composites, offering a low-cost, highly effective solution for industrial dye wastewater treatment.

Ammonium Ferric Sulphate for the Preparation of Heterogeneous Catalysts in Biodiesel Production

Ganesan, Shangeetha, et al. Renewable Energy 153 (2020): 1406-1417.

Ammonium ferric sulphate (AFS) has emerged as a key component in the design of heterogeneous acid catalysts for sustainable biodiesel synthesis. Given the limitations of homogeneous systems in handling high free fatty acid (FFA) feedstocks, AFS-based catalysts offer high tolerance to FFAs and water, making them especially suitable for waste cooking oils and industrial by-products.
In one study, a composite catalyst of ammonium ferric sulphate and calcium silicate (AFS-CS) was prepared via the impregnation method at a 2:1 mass ratio. The mixture was calcined at 500 °C for 3 h, producing a thermally stable material with strong acidic sites. This catalyst was freshly prepared prior to esterification reactions to ensure optimal activity.
Using lauric acid as a model substrate, esterification conditions were optimized at 65 °C with a methanol-to-acid molar ratio of 15:1 and 4 wt% catalyst loading. Under these conditions, AFS-CS achieved 100% conversion to methyl esters within 2 h. Application of the same parameters to palm fatty acid distillate (PFAD), a low-cost biodiesel feedstock, yielded a conversion efficiency of 72.6%.
The catalytic performance of ammonium ferric sulphate composites highlights their potential for scalable biodiesel production. By enabling efficient esterification of high-FFA feedstocks, AFS-based systems provide an inexpensive, eco-friendly solution to reduce reliance on food-grade oils while valorizing waste resources. This positions ammonium ferric sulphate as a versatile reagent in advancing renewable fuel technologies.

Ammonium Ferric Sulphate as a Homogeneous Catalyst for Esterification in Biodiesel Production

Ganesan, Shangeetha, et al. Renewable Energy 140 (2019): 9-16.

Ammonium ferric sulphate (AFS) has recently gained attention as an effective homogeneous acid catalyst for biodiesel synthesis. Conventional biodiesel production is often challenged by high free fatty acid (FFA) content in waste oils, which hampers conversion efficiency. The use of AFS provides a low-cost and efficient catalytic route for esterification, addressing these challenges while maintaining strong catalytic performance.
In a recent study, AFS was applied to the esterification of lauric acid, with optimization achieved through response surface methodology (RSM) and Central Composite Design (CCD). The investigation explored the interplay between reaction time, methanol-to-acid molar ratio, and catalyst loading. Statistical modelling identified reaction time and methanol ratio as the most influential parameters. The optimized conditions-1.5 h reaction time, 6:1 methanol-to-lauric acid molar ratio, and 8 wt% AFS loading-achieved an exceptional 99.8% methyl ester conversion.
These optimized parameters were further validated using palm fatty acid distillate (PFAD), a common biodiesel feedstock with high FFA content. Under identical conditions, AFS demonstrated a strong catalytic effect, yielding 81.2% conversion while reducing the PFAD acid value from 185 to 41 mg KOH/g.
The study highlights ammonium ferric sulphate as a promising, inexpensive, and readily available homogeneous catalyst. Its ability to efficiently lower FFA levels in waste oils underscores its practical value in biodiesel production, making AFS a potential candidate for large-scale, sustainable fuel applications.