| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4388615 | Ecological Engineering | 2016 | 9 Pages |
•Rice husk, an agro-industrial waste dumped in the environment causing serious ecological problems.•Rice husk in nanoform (n-RH) could be effectively used as biosorbent for 2,4-D removal from contaminated sites.•Rice husk nanoparticles were prepared using a simple method for enhanced biosorption of 2,4-D and the process was optimized using a five level Box Benhken design.•The results revealed the enhanced biosorptive potential of the n-RH nanosorbent for 2,4-D removal revealed via isotherm and kinetic models as well.•Thus, the present study aimed and achieved reducing the agro-industrial waste as well the herbicide pollution from aqueous solutions.
Rice husk is an enormously generated agroindustrial waste which causes serious environmental pollution. The aim of the current study is to constructively utilize rice husk nanosorbents (n-RH) for the biosorptive removal of 2,4-D from aqueous solution. The combined effect of the important process parameters such as initial pH, temperature, n-RH dosage, initial 2,4-D concentration and contact time on 2,4-D percentage removal was evaluated using five-level Box Benhken design (BBD). Maximum 2,4-D removal (%) of about 96.87% was perceived at pH of 5.0, temperature 30 °C, n-RH dosage of 1.5 g l−1, initial 2,4-D concentration of 100 mg l−1 and contact time of 60 min. The n-RH experimental data was fitted to the equilibrium and kinetic models which revealed a heterogenous and chemisorption mode of adsorption. A highest 2,4-D adsorption capacity of 76.92 mg g−1 was achieved with the help of n-RH adsorbent, while the spontaneous and endothermic nature of the adsorption process was revealed via thermodynamic studies. The FT-IR results revealed the presence of amino, carbonyl, hydroxyl and silica functional groups on the surface of the n-RH biosorbent confirming the kinetic result. Thus, the reported n-RH agro-industrial waste biosorbent could be promising for pesticide removal from contaminated aqueous systems.
