lenge for mercury removal from contaminated waters and industrial effluents. In this

Overview

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Key numbers

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• and maintained 38.7% selectivity toward Hg(II) in multicomponent solutions. DFT-based
• powerful means to describe the energetic heterogeneity of porous adsorbents (16).
• fitting parameters are summarized in Table 1. The PFO model showed poor agreement
• Table 1. Fitting results of kinetic models for Hg(II) adsorption on SG-3PS-Cys.
• Notes: Uncertainties are ±95% Confidence Interval from nonlinear regressions using the Levenberg–Marquardt
• Symbols represent the mean of triplicate measurements (±1 SD); continuous lines are visual guides.
• two-sites, S-shape, and Toth, were tested to describe the adsorption data (Figure 5, Table 2).
• Sips model best described the data at pH 3, while the S-shape model was more suitable
• of fast equilibrium (≈120 min) and >70% regeneration efficiency highlights the chemical
• regenerant. After four cycles, SG-3PS-Cys retained ~79% Hg(II) removal; in the fifth, effi-
• ciency declined by ~28% relative to the first but remained > 70% overall. This performance
• Table 2. Results of data adjustments to the models of Hg(II) ions adsorption isotherms on the
• (Table 3). The aminopropyl-functionalized MCM-41 by Hamid et al. (35) reported the
• Table 3. Comparative performance and mechanistic characteristics of representative Hg(II) adsorbents
• SG-3PS-Cys Hg–N/Hg–O Yes (~72%
• Table 4 summarizes the textural parameters of the SG-3PS-Cys and SG-3PS-Cys-Hg ad-
• the carboxyl carbon of cysteine resonates at 175.5 ppm, whereas an additional resonance
• appears at 170.5 ppm in SG-3PS-Cys-Hg, consistent with carboxylate groups involved
• ppm, corresponding to the α-carbon adjacent to –NH2 , exhibits partial splitting in SG-
• using AAnalyzer v2.25 to determine atomic concentrations (Table 5) (51); the C 1s region
• spectra (Figure 12c,d,i) confirm that carbon and sulfur remain chemically stable. The C–S
• Table 5. Atomic concentrations are calculated as organic compounds.
• SG-3PS-Cys-Hg 88.8% 3.0% 6.1% 2.1%
• following pseudo-second-order kinetics and retained over 70% removal efficiency after
• Tetraethyl orthosilicate (TEOS, 99%) was used as the main silica source, L-cysteine
• (Cys, 98%) as the active ligand, and (3-chloropropyl) triethoxysilane (3CPTES, 97%) as
• the coupling agent. Mercury (II) nitrate monohydrate (≥98%) was used for preparing Hg
• solutions, and triethylamine (TEA, 99.5%) served as the gelling agent. All reagents were
• ters are expressed as mean ± 95% Confidence Interval obtained by nonlinear regression
• uptake at pH 3–5, representative of wastewater effluents (37). Initial concentrations ranged
• calculated with Equation (1). Reported values correspond to the mean of three replicates.
• preloaded to ~15% of its total capacity (0.343 mmol N g−1 by elemental analysis; θ ≈ 0.15)
• removal % = ∗ 100 (2)
• 18. Diario Oficial de la federación. NOM- 001-SEMARNAT 2021. Que establece los límites permisibles de contaminantes

Methods (brief)

• adsorption of Hg(II) and other metals. In multi-cation tests, Hg was quantified by ICP-MS, while
• co-ions were measured by AAS to meet detection limits and prevent Hg memory effects. (c) Cysteine
• Sample SBET (m2 g−1 ) CBET
• (T2 /T3 /Q2 /Q3 ≈ 10/35/5/50) remains unchanged in both samples, confirming that the
• Figure 11. Wide-scan XPS spectra for sample (a) SG-3PS-Cys and (b) SG-3PS-Cys-Hg.
• Sample O1s, C1s, Si2p N1s S2p Hg4f
• sample SG-3PS-Cys (upper figures) and SG-3PS-Cys-Hg, respectively, including Hg4f overlapping
• Si2p in SG-3PS-Cys-Hg sample (lower figures).
• stants. After agitation in a thermostated bath, samples were filtered and analyzed for
• total Hg by ICP- MS (Agilent 7500a). Error bars represent ±1 SD, and kinetic parame-
• tration, mercury concentrations were measured by ICP-MS, and equilibrium uptake was
• determined using an Analytik Jena ContrAA 300 AAS (for Cr, Fe, Cd, Pb, Cu) and ICP-MS
• (50 ◦ C, 24 h), and reused. Mercury content was determined by ICP-MS, and the amounts
• (Micromeritics, Norcross, GA, USA). Prior to analysis, 0.2 g of sample was degassed
• ter equipped with an ATR iD5 module (Waltham, MA, USA). Prior to analysis, samples
• were dried at 50 ◦ C for 24 h. Spectra were collected over 500–4000 cm−1 with 4 cm−1
• resolution and 16 scans per sample.
• Samples were dehydrated for 48 h at 333 K before analysis. Solid-state NMR was

Implications

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Wiki pages this source may touch

• Fish — marine, predatory (tuna, swordfish, shark, king mackerel)
• Mercury

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Update history

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