Biosorption of Heavy Metal Ions onto Agricultural Residues Buckwheat Hulls Functionalized with 1-Hydroxylethylidenediphosphonic Acid

Abstract

Novel biosorbent materials obtained from agricultural residues buckwheat hulls (BH) were successfully developed through functionalization with 1-hydroxylethylidenediphosphonic acid (HEDP), and they were characterized. This paper reports the feasibility of using HEDP-BH for removal of heavy metals from stimulated wastewater, the experimental results revealed that the adsorption property of functionalized buckwheat hulls with 120 mesh 120-HEDP-BH for Au(III) was very excellent, and the monolayer maximum adsorption capacity for Au(III) calculated from the Langmuir isotherm models was up to 450.45 mg/g at 35 °C. The combined effect of initial solution pH, 120-HEDP-BH dosage, and initial Au(III) concentration was investigated using response surface methodology (RSM), and the result showed that biomass dosage exerted a stronger influence on Au(III) uptake than those of initial pH and initial Au(III) concentration. Analysis of variance (ANOVA) of the quadratic model demonstrated that the model was highly significant. Moreover, investigation on the adsorption selectivity showed that 120-HEDP-BH displayed strong affinity for gold in aqueous solutions and even exhibited 100% selectivity for Au(III) ions in the presence of Zn(II) and Co(II). Regeneration capacities of 120-HEDP-BH were studied using the eluent solutions of 0.0-5.0% thiourea in 0.1 mmol/L HCl, and it was found that the adsorption capability remains high after several cycles of adsorption-desorption process.

Biosorption of Multifold Toxic Heavy Metal Ions from Aqueous Water onto Food Residue Eggshell Membrane Functionalized with Ammonium Thioglycolate

“…In recent years, biosorption has received an increasing amount of attention for the removal and recovery of heavy metals from aqueous solutions because biomaterials are abundant, inexpensive, and available in nature and because of minimization of secondary wastes. − However, they usually suffer from disadvantages, including poor metal removal ability and slow process kinetics. Thus, it is highly desirable to develop inexpensive adsorbents with a strong affinity for toxic metal ions.…”

Facile preparation of multiphosphonic acid functionalised multi‐walled carbon nanotubes for enhanced adsorption properties for heavy metal ions from wastewaters

“…The surface modification can further provide binding sites and greatly promote the adsorption properties for some particular metal ions, especially for Pb(II)/Au (III). It is worth mentioning that the adsorption capacities of ATMP‐MWCNTs for gold ions are much more than the ones in our previous work [38]. The lead/gold ions adsorption capacities of HEDP‐MWCNTs/ATMP‐MWCNTs are greatly enhanced after the functionalisation of organophosphonic acid, HEDP‐MWCNTs/ATMP‐MWCNTs has the highest adsorption capacities for Pb(II)/Au(III), respectively, and the multiorganophosphonic acid functional groups on the surface of MWCNTs might possess high affinity for lead/gold ions.…”

Critical Review of Bioadsorption on Modified Cellulose and Removal of Divalent Heavy Metals (Cd, Pb, and Cu)

“…The search for sustainable, reusable, environmentally friendly, and economically favorable potential bioadsorbents has directed attention toward abundantly available plant-based biomasses as well as agricultural and industrial , wastes. Enzymes immobilized on cellulose-based materials have also been used for degrading pollutants for water purification. , Heavy metal adsorption on fruit peels, , plant leaves, rice husk, peanut waste, corn waste, egg shells, tea waste, coconut coir pith, and sugar cane bagasse has been widely investigated in the recent past.…”