Activated rice husk ash: a sustainable and high capacity adsorbent for the remediation of Carbol Fuchsin dye from aqueous effluents
- 1Babasaheb Bhimrao Ambedkar University, A Central University, Lucknow, India
- 2Babasaheb Bhimrao Ambedkar University, A Central University
Abstract
The discharge of persistent synthetic dyes, such as Carbol Fuchsin (CF), from textile and related industries constitutes a significant environmental and public health concern because oftheir toxicity and resistance to natural degradation. This study presents the development and application of a low-cost, sustainable adsorbent—activated carbon derived from rice husk ash (ARHA)—for the efficient removal of CF from contaminated water. The adsorbent was characterized using FT-IR, SEM-EDX, XRD, and zeta potential analysis, revealing a mesoporous, amorphous structure with a specific surface area of 50–270 m²/g and a point of zero charge (pHpzc) at 8.3. Systematic batch adsorption studies were conducted to optimize the process parameters, achieving a maximum removal efficiency of >96% at an adsorbent dosage of 0.08 g/50 mL, contact time of 150 min, and pH 9.0. The adsorption kinetics were best described by the pseudo-second-order model, indicating that chemisorption was the rate-limiting step. The equilibrium isotherm data were well-fitted by the Langmuir model, confirming monolayer adsorption with an exceptionally high maximum capacity of 205.24 mg/g. Thermodynamic analysis (negative ΔG° and ΔH°) established the process as spontaneous and exothermic. The findings demonstrate that ARHA, an agricultural waste derivative, is a highly effective, eco-friendly, and economically viable material for the advanced treatment of dye-laden industrial wastewater, offering a promising alternative to conventional remediation methods.
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BibTeX
@article{patel2026activated,
title = {{Activated rice husk ash: a sustainable and high capacity adsorbent for the remediation of Carbol Fuchsin dye from aqueous effluents}},
author = {Asmit Patel and Adarsh Pratap Singh and Anshika Sharma and Priya Tiwari and Shilpa Nair and Shivam Yadav},
journal = {Discover Chemistry.},
year = {2026},
month = may,
doi = {10.1007/s44371-026-00658-w},
url = {https://doi.org/10.1007/s44371-026-00658-w},
note = {CC BY-NC-ND},
}
RIS
TY - JOUR
TI - Activated rice husk ash: a sustainable and high capacity adsorbent for the remediation of Carbol Fuchsin dye from aqueous effluents
AU - Asmit Patel
AU - Adarsh Pratap Singh
AU - Anshika Sharma
AU - Priya Tiwari
AU - Shilpa Nair
AU - Shivam Yadav
PY - 2026
DA - 2026/05/14
JO - Discover Chemistry.
DO - 10.1007/s44371-026-00658-w
UR - https://doi.org/10.1007/s44371-026-00658-w
AB - The discharge of persistent synthetic dyes, such as Carbol Fuchsin (CF), from textile and related industries constitutes a significant environmental and public health concern because oftheir toxicity and resistance to natural degradation. This study presents the development and application of a low-cost, sustainable adsorbent—activated carbon derived from rice husk ash (ARHA)—for the efficient removal of CF from contaminated water. The adsorbent was characterized using FT-IR, SEM-EDX, XRD, and zeta potential analysis, revealing a mesoporous, amorphous structure with a specific surface area of 50–270 m²/g and a point of zero charge (pHpzc) at 8.3. Systematic batch adsorption studies were conducted to optimize the process parameters, achieving a maximum removal efficiency of >96% at an adsorbent dosage of 0.08 g/50 mL, contact time of 150 min, and pH 9.0. The adsorption kinetics were best described by the pseudo-second-order model, indicating that chemisorption was the rate-limiting step. The equilibrium isotherm data were well-fitted by the Langmuir model, confirming monolayer adsorption with an exceptionally high maximum capacity of 205.24 mg/g. Thermodynamic analysis (negative ΔG° and ΔH°) established the process as spontaneous and exothermic. The findings demonstrate that ARHA, an agricultural waste derivative, is a highly effective, eco-friendly, and economically viable material for the advanced treatment of dye-laden industrial wastewater, offering a promising alternative to conventional remediation methods.
SN - 3005-1193
ER -