“…The kinetic parameters obtained by fitting are listed in Table 1 (C 0 = 100 mg/L) and Table S2 (C 0 = 400 mg/L). The results show that the adsorption of Au (Ⅲ) by the amino acid resins accorded with the pseudo-second-order kinetic model, suggesting the mechanism by which Au(III) ions were absorbed was chemical adsorption [ 35 , 36 ].…”
The hydrometallurgical recovery of gold from electronic waste and gold slag is a hot research topic. To develop a cost-effective and environmentally friendly adsorbent for gold recovery, four types of amino-acid (arginine, histidine, methionine, and cysteine)-functionalized cellulose microspheres were prepared via a radiation technique. The adsorption performance of the amino acid resins toward Au(III) ions was systematically investigated by batch experiments. The amino acid resins could absorb Au(III) ions at a wide pH range. The adsorption process was followed by the pseudo-second-order model and Langmuir model. The theoretical maximum adsorption capacity was calculated as 396.83 mg/g, 769.23 mg/g, 549.45 mg/g, and 636.94 mg/g for ArgR, HisR, MetR, and CysR, respectively. The amino acid resins could effectively and selectively recover trace Au(III) ions from the leaching solutions of printed circuit board and gold slag waste. Lastly, the mechanism underlying amino acid resin’s Au(III) ion recovery capability was investigated by FTIR, XRD, and XPS analyses. This work describes a series of cost-effective gold adsorbents with excellent selectivity and adsorption capacity to boost their practical application.
“…The kinetic parameters obtained by fitting are listed in Table 1 (C 0 = 100 mg/L) and Table S2 (C 0 = 400 mg/L). The results show that the adsorption of Au (Ⅲ) by the amino acid resins accorded with the pseudo-second-order kinetic model, suggesting the mechanism by which Au(III) ions were absorbed was chemical adsorption [ 35 , 36 ].…”
The hydrometallurgical recovery of gold from electronic waste and gold slag is a hot research topic. To develop a cost-effective and environmentally friendly adsorbent for gold recovery, four types of amino-acid (arginine, histidine, methionine, and cysteine)-functionalized cellulose microspheres were prepared via a radiation technique. The adsorption performance of the amino acid resins toward Au(III) ions was systematically investigated by batch experiments. The amino acid resins could absorb Au(III) ions at a wide pH range. The adsorption process was followed by the pseudo-second-order model and Langmuir model. The theoretical maximum adsorption capacity was calculated as 396.83 mg/g, 769.23 mg/g, 549.45 mg/g, and 636.94 mg/g for ArgR, HisR, MetR, and CysR, respectively. The amino acid resins could effectively and selectively recover trace Au(III) ions from the leaching solutions of printed circuit board and gold slag waste. Lastly, the mechanism underlying amino acid resin’s Au(III) ion recovery capability was investigated by FTIR, XRD, and XPS analyses. This work describes a series of cost-effective gold adsorbents with excellent selectivity and adsorption capacity to boost their practical application.
“…Adsorption feasibility was evaluated using thermodynamic studies 60 . To evaluate the thermodynamics of the As(III) adsorption process, the changes in enthalpy (ΔH°), entropy (ΔS°), and free energy (ΔG°) were determined using the following equations 61 : Figure 14 Effect of temperature on As(III) adsorption ( a ), the linear plot of Thermodynamic ( b ). …”
Arsenite (As(III)) is the most toxic form of arsenic that is a serious concern for water contamination worldwide. Herein a ZnO/Halloysite (Hal) nanocomposite was prepared by the chemical bath deposition method (CBD) through seed-mediated ZnO growth on the halloysite for eliminating As(III) from the aqueous solution. The growth of ZnO on seeded halloysite was investigated based on the HMTA: Zn2+ molar ratio in the solution. An optimum molar ratio of HMTA:Zn for nucleation and growth of ZnO upon halloysite was obtained 1:2 based on morphological analysis. The TGA results confirmed that thermal stability of HNT was enhanced by ZnO decoration. The prepared ZnO/Hal nanocomposite at optimal conditions was employed for arsenite (As(III)) removal from aqueous solutions. Experimental data were evaluated with different isothermal, thermodynamic, and kinetic models. Based on the zeta potential results, Hal nanocomposites had a greater negative value than pure Hal. Therefore, the ZnO/Hal nanocomposite exhibited efficient As(III) adsorption with a removal efficiency of 76% compared to pure Hal with a removal efficiency of 5%. Adsorption isotherm was well correlated by both non-linear Langmuir and Sips models, exhibiting maximum adsorption capacity of As(III) at 42.07 mg/g, and 42.5 mg/g, respectively. As a result of the study, it was found that the fabricated Hal nanocomposite with low toxicity can be used effectively in water treatment.
“…Those included are physical methods such as flocculation or coagulation, adsorption, and filtration using membranes; oxidation methods including chemical and advanced oxidations; , and biological methods, which use microorganisms and enzymes . Among the treatment methods, adsorption has advantages due to its flexibility and simplicity, high efficiency, and no sludge produced. − Costs associated with the adsorption process are largely determined by the adsorbent used. Agricultural biomass has been studied as an alternative adsorbent to ameliorate the drawbacks, due to its superiority of being green, low-cost, porous and cellulosic in nature, and the availability of various functional groups. , …”
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