Potential Sorbent Research Articles

Alternate materials for the capture and quantification of gaseous oxidized mercury in the atmosphere

Abstract. Methodologies for identifying atmospheric oxidized mercury (HgII) compounds, including particulate-bound HgII (HgII(p)) and gaseous oxidized mercury (HgII(g)), by mass spectrometry are currently under development. This method requires preconcentration of HgII for analysis due to high instrument detection limits relative to ambient HgII concentrations. The objective of this work was to identify and test materials for quantitative capture of HgII from the gas phase and to suggest potential surfaces onto which HgII can be collected, thermally desorbed, and characterized using mass spectrometry methods. From the literature, several compounds were identified as potential sorbent materials and tested in the laboratory for uptake of gaseous elemental mercury (Hg0) and HgII(g) (permeated from a HgBr2 salt source). Chitosan, α-Al2O3, and γ-Al2O3 demonstrated HgII(g) capture in ambient air laboratory tests, without sorbing Hg0 under the same conditions. When compared to cation exchange membranes (CEMs), chitosan captured a comparable quantity of HgII(g), while ≤90 % of loaded HgII(g) was recovered from α-Al2O3 and γ-Al2O3. When deployed in the field, the capture efficiency of chitosan decreased compared to CEMs, indicating that environmental conditions impacted the sorption efficiency of this material. The poor recovery of HgII from the tested materials compared to CEMs in the field indicates that further identification and exploration of alternative sorbent materials are required to advance atmospheric mercury chemistry analysis by mass spectrometry methods.

Brewer’s spent grain as a potential sorbent for toxicology methods: application to antidepressant analysis in urine

Brewer’s spent grain as a potential sorbent for toxicology methods: application to antidepressant analysis in urine

U(Ⅵ) sorption by porous sodium zirconium phosphate pellets from aqueous solution

Zirconium phosphate is the first artificially produced layered phosphate that can sorb a variety of nuclides from solutions. Sodium zirconium phosphate (NZP) was a type of α-zirconium phosphate (α-ZrP). The porous sodium zirconium phosphate pellets (p-NZP-P) with a diameter of more than ∼3 mm were prepared and used for uranium sorption. The p-NZP-P could be immersed in solutions for more than 5 days without dissolving and structurally collapsing. The sorption properties of U(Ⅵ) on p-NZP-P in solutions were investigated by both static and dynamic sorption tests. Synthetic p-NZP-P was analyzed in detail using various characterizations to investigate their character and structural changes. In the static sorption experiment, the equilibrium sorption capacity reached the 77.5 ± 1.5 mg·g−1 when the initial concentration of U(Ⅵ) was 100 mg/L, pHinitial = 4.5, T = 25 ℃. Uranium sorption increased by ∼69 % and ∼215 %, respectively, when the initial uranium concentration was increased from 100 to 300 mg·L−1 and the temperature was increased from 15 to 55 °C. Furthermore, uranium sorption increased by ∼541 % when the initial pH increased from 2.5 to 4.5, while it decreased by ∼39 % when the initial pH increased from 4.5 to 7.0. The sorption data corresponded to the pseudo-second-order kinetic model and the Langmuir isotherm model, as well as the theoretically predicted value of sorption capacity (∼199.9 mg·g−1). The results of the dynamic sorption experiment showed that decreasing the quality, increasing the flow rate and the initial U(Ⅵ) concentration would shorten the breakthrough time. The dynamic sorption data agreed well with the Thomas model. The characterization confirmed the porous properties, while the U(Ⅵ) sorption mechanisms relate to –OH coordination and ion exchange. A radioactive rare earth wastewater treatment test suggested that p-NZP-P could be the potential uranium sorbent due to its good stability and efficiency. This paper opened opportunities for the development of practical materials for treating radioactive wastewater in the application of actual scenarios.

Application of 3D structure of carbon nanotube-interwoven metal–organic frameworks in solid-phase microextraction of trace polychlorinated biphenyls from tea beverages

A three-dimensional (3D) structure of multiwalled carbon nanotubes (MWCNTs) interwoven metal–organic frameworks (MOFs) was synthesized. The MWCNTs was utilized to bridge the neighboring MOF nanocrystals. The hybrid material MOFs/MWCNTs was used for SPME coating to extract six PCBS in tea beverages samples by gas chromatography coupled to tandem mass spectrometry. MOFs/MWCNTs coating materials were characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and N2 adsorption–desorption analysis. The response surface method was utilized to systematically optimize the main extraction factors. Under the optimized conditions, the developed method demonstrated wide linear ranges (0.01–1000 ng·L−1), low limits of detection (0.003–0.009 ng·L−1) and high enrichment factors (701–2361) for extracting and determining six PCBS. The six PCBS concentration in environmental tea beverages samples was detected with this method. These results display that MOFs/MWCNTs hybrid materials are potential sorbents in the SPME of PCBS in environmental tea beverages samples.

Development and application of a new macrocyclic ligand-functionalized mesoporous silica sorbent for selective separation of radiocesium from environmental wastewater

The growing reliance on nuclear energy and uncharacteristic accidents, such as those in Chornobyl and Fukushima, have emphasized the need for effective radiocesium (r-Cs: 137Cs) removal from environmental wastewater. This study presents the development of DFDB18C6@SBA-NH2, a novel solid-phase sorbent designed to remove r-Cs from aqueous environments selectively. The sorbent was synthesized by tethering a macrocyclic ligand, DFDB18C6 (di-formyl dibenzo-18-crown-6-ether), to amino-functionalized mesoporous SBA-15 (Santa Barbara Amorphous-15). The sorbent’s structure, thermal properties, and surface morphology were comprehensively characterized. Batch sorption experiments were performed to evaluate the influence of different operating factors on r-Cs sorption, including solution pH, contact duration, initial ion concentration, ambient temperature, and matrix ions contents. The sorption behavior was better explained with the pseudo-second-order kinetic and Langmuir isotherm models, which suggest a probable monolayer chemisorption process. The thermodynamic evaluation indicated the exothermic nature of the sorption process. The DFDB18C6@SBA-NH2 sorbent demonstrated significant 137Cs removal (approximately 85 %) from Fukushima-originated wastewater, with competing matrix ions such as Ca2+, Mg2+, Na+, and K+. These results highlight the potential of DFDB18C6@SBA-NH2 as a potential solid-phase sorbent for efficient and selective r-Cs decontamination in waste aqueous matrices.

Hibiscus leaf petiole derived activated carbon as a potential sorbent for basic green 4 and reactive yellow 15 dye exclusion from aqueous solution

In this study, hibiscus leaf petiole powder is used as a source of carbon to prepare bio-adsorbent. This bio-adsorbent is carbonized by heating and activated thereafter by means of KOH and employed as an alternative adsorbent for Basic Green 4 (BG4) and Reactive Yellow 15 (RY15) dyes. Microstructural features observed from scanning electron microscope (SEM) shows the presence of openings/voids before adsorption and their disappearance after dye adsorption. Fourier transform infrared (FTIR) spectrum shows the shift in peak positions of prominent functional moieties post adsorption endorsing the contact between bio-adsorbent and the dye molecules. The dye adsorption performance of as prepared bio-adsorbent on both the dyes were evaluated by varying the solution pH value between 3 and 9, initial dye concentration, Co between 30–90 mg/L, interaction time, t between 10 and 60 min and adsorbent dose, m between 0.1 and 0.6 g/50 ml. The optimal condition investigated for dye exclusion is computed to be Co = 30 mg/L, t = 40 min, m = 0.3 g for both the dyes. However, the pH values of 9 and 3 respectively were found to be optimum for the removal of BG4 and RY15. Maximum adsorption capacity (qm) for RY15 and BG4 were found to be 41.23 and 61.38 mg/g respectively revealing hibiscus leaf derived activated carbon as an excellent bio-adsorbent. The adsorption kinetics of both dyes followed pseudo-second-order model and the adsorption isotherms is best suited to Langmuir model. These findings confirm that the as prepared bio-adsorbent can be successfully employed as an unconventional adsorbent to remove the toxic dyes from aqueous solutions.

Green synthesis of a superhydrophobic porous organic polymer for the removal of volatile organic compounds at high humidity

Superhydrophobic porous organic polymers are potential sorbents for volatile organic compounds (VOCs) pollution control by suppressing the competition of water molecules on their surfaces. However, the synthesis of superhydrophobic reagents usually requires large amounts of organic solvents and a long reaction time (≥ 24 h). Herein, a green mechanochemical method was developed to synthesize a superhydrophobic polymer (MSHMP-1) with the advantages of using a small amount of organic solvents (5 mL/g) and a short reaction time (2 h). Meanwhile, MSHMP-1 with a water contact angle (WCA) of 162° exhibited a dramatically rich pore structure as revealed by its specific surface area (SSA) of 1780 m2/g. The decrease in the adsorption of benzene on MSHMP-1 due to the competition of water molecules, even at relative humidity of 90 %, was nonsignificant (<10 %), indicating the great application potential of MSHMP-1 in hydrophobic adsorption. Moreover, the adsorption capacity of MSHMP-1 was maintained after at least five adsorption–desorption cycles. Therefore, MSHMP-1 can be a remarkable adsorbent for the removal of hazardous VOCs, especially at high humidity levels.

Study of lyophilic properties of pyrocarbon as a potential sorbent for cleaning water from oil and oil products

The lyophilic properties of pyrocarbon, obtained by pyrolysis of worn automobile tires, in relation to oil, gasoline, benzene, hexane, water, and water-oil and water-gasoline emulsions were studied. The research was carried out by the method of a lying drop on the surface formed by pyrocarbon particles of different dispersion, by determining the contact angle of wetting. The value of this angle was determined by analyzing images obtained photographically. It was established that organic substances and water have a significant contrast in terms of the wetting of pyrocarbon. Based on the determination of the contact angle, the work of adhesion in different systems was calculated depending on the temperature. Based on this, the conclusion was formulated that the selectivity of absorption of oil and oil products will increase with increasing temperature.

Understanding the effect of density functional choice and van der Waals treatment on predicting the binding configuration, loading, and stability of amine-grafted metal organic frameworks.

Metal organic frameworks (MOFs) are crystalline, three-dimensional structures with high surface areas and tunable porosities. Made from metal nodes connected by organic linkers, the exact properties of a given MOF are determined by node and linker choice. MOFs hold promise for numerous applications, including gas capture and storage. M2(4,4'-dioxidobiphenyl-3,3'-dicarboxylate)-henceforth simply M2(dobpdc), with M = Mg, Mn, Fe, Co, Ni, Cu, or Zn-is regarded as one of the most promising structures for CO2 capture applications. Further modification of the MOF with diamines or tetramines can significantly boost gas species selectivity, a necessity for the ultra-dilute CO2 concentrations in the direct-air capture of CO2. There are countless potential diamines and tetramines, paving the way for a vast number of potential sorbents to be probed for CO2 adsorption properties. The number of amines and their configuration in the MOF pore are key drivers of CO2 adsorption capacity and kinetics, and so a validation of computational prediction of these quantities is required to suitably use computational methods in the discovery and screening of amine-functionalized sorbents. In this work, we study the predictive accuracy of density functional theory and related calculations on amine loading and configuration for one diamine and two tetramines. In particular, we explore the Perdew-Burke-Ernzerhof (PBE) functional and its formulation for solids (PBEsol) with and without the Grimme-D2 and Grimme-D3 pairwise corrections (PBE+D2/3 and PBEsol+D2/3), two revised PBE functionals with the Grimme-D2 and Grimme-D3 pairwise corrections (RPBE+D2/3 and revPBE+D2/3), and the nonlocal van der Waals correlation (vdW-DF2) functional. We also investigate a universal graph deep learning interatomic potential's (M3GNet) predictive accuracy for loading and configuration. These results allow us to identify a useful screening procedure for configuration prediction that has a coarse component for quick evaluation and a higher accuracy component for detailed analysis. Our general observation is that the neural network-based potential can be used as a high-level and rapid screening tool, whereas PBEsol+D3 gives a completely qualitatively predictive picture across all systems studied, and can thus be used for high accuracy motif predictions. We close by briefly exploring the predictions of relative thermal stability for the different functionals and dispersion corrections.

Valorization of Crab Shells as Potential Sorbent Materials for CO2 Capture.

This study delves into the potential advantage of utilizing crab shells as sustainable solid adsorbents for CO2 capture, offering an environmentally friendly alternative to conventional porous adsorbents, such as zeolites, silicas, metal-organic frameworks (MOFs), and porous carbons. The investigation focuses on crab shell waste, which exhibits inherent natural porosity and N-bearing groups, making them promising candidates for CO2 physisorption and chemisorption applications. Selective deproteinization and demineralization treatments were used to enhance textural properties while preserving the natural porous structure of the crab shells. The impact of deproteinization and demineralization treatments on CO2 adsorption and speciation at the atomic scale, via solid-state NMR, and correlated findings with textural properties and biomass composition were investigated. The best-performing sample exhibits a surface area of 36 m2/g and a CO2 adsorption capacity of 0.31 mmol/g at 1 bar and 298 K, representing gains of ∼3.5 and 2, respectively, compared to the pristine crab shell. These results underline the potential of fishing industry wastes as a cost-effective, renewable, and eco-friendly source to produce functional porous adsorbents.

Lignin-Based Platform as a Potential Low-Cost Sorbent for the Direct Air Capture of CO2.

The urgent need to address the current climate crisis has led to concerted efforts to develop low-cost and sustainable methods to remove carbon dioxide from the atmosphere. Carbon capture and storage (CCS) and negative emissions technologies (NET's) offer the most promising paths forward to offsetting global emissions. In this study, we explore the potential of kraft lignin, a readily available biomaterial, as a low-cost alternative for the development of a CO2 sorbent. The approach leverages the known ability of amines to reacting with carbon dioxide and forming a stable compound. Commercially available kraft lignin was modified with diethylenetriamine (DETA), triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) using a one-pot synthesis approach via the Mannich reaction. The sorbent was evaluated for porosity, accessible amine density, and nitrogen content. The CO2 capture experiments revealed that the resulting sorbent can capture 0.80 (±0.03) mmol of CO2 per gram of sorbent.

Modified agricultural waste adsorbent for zinc ions removal from aqueous solution: Equilibrium, kinetics, and thermodynamics investigation

The current research signifies potential bio sorbent (banana and Pomegranate peel) With a view for zinc ions adsorption as of aqueous solution. Mass, zinc ion concentration, pH, time, and temperature parameters were examined. The highly beneficial requirements for zinc ion adsorption are 10 ppm as preliminary concentration, 0.21 g as pomegranate and banana rinds dosage and 5.5, 5.23 as pH for banana and Pomegranate rind. Elimination results follow the Langmuir replica with qmax of 25.64 mg/g for banana and 41.66 mg/g for Pomegranate rind. The elimination process kinetic was equipped well via second -order equivalence. It was examined that the zinc ion adsorption procedure on both bio sorbents is instinctive procedure, endothermal for banana and pomegranate rind. A distinctive enhancement in the adsorptive shell was observed once the adsorption procedure that revealed through scanning electron microscope.

Adsorption and photocatalytic degradation activities of a hybrid magnetic mesoporous composite of α-Fe2O3 nanoparticles embedded with sheets-like MgO

Crystal violet (CV), identified as a potential carcinogen, is a synthetic dye prevalent in wastewater from textile and paint industries. Therefore, the current study demonstrates that the hybrid composite of mesoporous magnetic α-Fe2O3 nanoparticles @ sheet-like MgO (Fe2O3@MgO) can be employed as a potential effective sorbent and photocatalyst for CV-removal from polluted water. A comparative study was systematically performed on the CV-removal using MgO and Fe2O3@MgO composite. The physicochemical, textural, and structural properties, morphological features, and elemental composition of mesoporous Fe2O3@MgO composite were intensively investigated. Batch trials were performed to optimize the sorption conditions. The highest CV-uptake efficiency was detected at pH 9 within the adsorption equilibrium time of about 30 min, where the maximum capacity of Fe2O3@MgO was 50.8 mg/g. Under UV irradiation, the Fe2O3@MgO photocatalyst exhibited a high efficiency and fast response toward CV-removal. The mechanism of CV removal was researched through zeta potential (ZP), bandgap, and density functional theory (DFT) calculations. The outcome demonstrated that mesoporous Fe2O3@MgO sorbent/photocatalyst could be recycled and reused ten times, making it a cost-effective solution for removing CV-dye from wastewater. This manuscript suggested that mesoporous Fe2O3@MgO composite is an efficient adsorbent/photocatalyst for fast, affordable, and efficient decontamination of CV-dye from wastewater.

Chemically treated Posidonia oceanica fibers as a potential sorbent for oil spill clean up

Posidonia oceanica (PO) fibers were used as biodegradable solid waste material in the removal of oil spills from seawater. In the present study, PO fibers were chemically treated using H3PO4, KOH, ZnCl2 and H2O2. The Fourier Transform Infrared spectroscopy and scanning electron microscopy were used to compare and to determine the structure of the raw and the chemically-treated PO fibers. The main parameters studied in the two systems, a mixture system of oil and water and a system with only oil or only water, were the chemical solutions concentrations, initial oil concentration and time contact. The results revealed that PO fibers treated with phosphoric acid (H3PO4) showed an enhancement of oil sorption of 12% in oil/water layer, compared to raw PO fibers. An increase of hydrophobicity was also observed with treated fibers as revealed by the 50% decrease in water sorption capacity. The isotherm and kinetic models were determined to reveal the nature and the mechanism of the sorption. Langmuir isotherm appeared to be the best fitting model showing a one-layer oil sorption onto PO fibers. In addition, the results fitted well with the pseudo-second order kinetic model compared to pseudo-first order representing the chemical sorption of oil. The results indicated that the treated biosorbent could be used as biodegradable material to clean-up oil spills in aqueous solution.

Cation exchange to montmorillonite induces selective adsorption of amino acids

Concentrating simple organic molecules, such as amino acids, in the adsorbed phase could have been an early step in prebiotic evolution towards more complex bio-macromolecules on the early Earth. Smectite clay minerals represent potential selective sorbents for prebiotic molecules because of their negative structural charge and high surface area. This study evaluated the adsorption behavior of amino acids to montmorillonite, a well-characterized smectite, at varying pH and fluid compositions. At both pH 5 and 7 in a sodium chloride fluid, amino acids with basic sidechains (L-arginine and L-lysine), which are primarily cationic under these conditions, were selectively adsorbed to montmorillonite with Langmuir constants much greater than amino acids that were predominantly zwitterionic or anionic in solution. On average, the Langmuir constants for the cationic amino acids were 30 (pH 5) and 50 (pH 7) times greater than the constants for zwitterionic amino acids and 120 (pH 5) and 80 (pH 7) times greater than the constants for L-glutamic acid. Under the same pH conditions in a magnesium chloride solution, the adsorption of L-arginine and L-lysine was substantially inhibited with Langmuir constants ∼ 10 times smaller. These observations suggest that cation exchange is the dominant adsorption mechanism for amino acids on montmorillonite. X-ray diffraction and infrared spectroscopy indicate that L-arginine and L-lysine enter the smectite interlayer where the protonated amino sidechain has the strongest interactions with the mineral surface, further supporting adsorption driven primarily through electrostatic interactions. Therefore, smectites on the early Earth may have selectively concentrated cationic amino acids, providing a potential template for the polymerization of α-amine linked peptides.

Advancing biogas purification: A systematic numerical study of MOF performance under humid conditions

The adsorption of gases in nanopores represents a promising engineering tool applicable for gas storage and separation. This study provides a comprehensive evaluation of metal–organic frameworks (MOFs) for biogas purification, with a specific focus on their performance under humid conditions. Beginning with 22 structures identified in the literature as potential top sorbents, we employ numerical simulations of adsorption and kinetic selectivity to identify the best-performing MOFs. The research reveals that the presence of water significantly impacts the biogas separation process due to water clustering, which notably affects CO2 adsorption. The simulations also indicate variations in regenerability and selective adsorption among the initially selected MOFs in wet conditions. These findings underscore the effectiveness of high-throughput numerical screening in identifying materials with specific properties and ensuring stable performance under varying environmental conditions.

Evaluation of highly adsorptive Guefoams (multifunctional guest-containing foams) as a potential sorbent for determination of volatile organic compounds (VOCs) by means of thermal desorption

The present work delves into the feasibility of employing a novel structured sorbent referred to as GFAD (Guefoam Adsorption Device) for the determination of volatile organic compounds (VOCs) in liquid samples. The chosen method has been static headspace sorptive extraction-thermal desorption gas chromatography mass spectrometry (HSSE-TD-GC–MS). The GFAD comprises an aluminum cellular material with a distinct replication structure and a solid guest phase consisting of activated carbon particles dispersed within the cavities of the cellular aluminum. The extensive specific surface area, robustness, and exceptional thermal conductivity of this pioneering material offer distinct advantages over commercially available polydimethylsiloxane-based Twister® devices. Therefore, the trapping efficiency for volatile organic compounds is enhanced, and it is possible to perform the analysis of concentrated samples. According to computational simulations, it has been demonstrated that GFAD has a high heat conductivity. As a result, the desorption efficiency is improved, and minimal temperature gradients are generated throughout the GFAD during the heating process. Besides, the energy consumption is significantly lowered, thus aligning with environmentally conscientious and sustainable analytical practices.The experimental results give a proof of the suitability of the GFAD for determining gaseous compounds in liquid samples through HSSE-TD-GC–MS. For volatile species, the new material provides higher peak areas and lower limits of detection than a commercially available Twister® device. Furthermore, the GFAD is reusable, its adsorbing properties remaining unchanged during, at least, 100 consecutive analyses. In addition, unlike to the Twister®, no intense siloxane peaks are observed in the chromatograms obtained with the GFAD. The feasibility of qualitative and semi-quantitative analysis with the new accessory has been demonstrated with both standards and a cereal bioethanol real sample.Graphical abstract

Effect of Additives on CO2 Adsorption of Polyethylene Polyamine-Loaded MCM-41.

Organic amine-modified mesoporous carriers are considered potential CO2 sorbents, in which the CO2 adsorption performance was limited by the agglomeration and volatility of liquid amines. In this study, four additives of ether compounds were separately coimpregnated with polyethylene polyamine (PEPA) into MCM-41 to prepare the composite chemisorbents for CO2 adsorption. The textural pore properties, surface functional groups and elemental contents of N for MCM-41 before and after functionalization were characterized; the effects of the type and amount of additives, adsorption temperature and influent velocity on CO2 adsorption were investigated; the amine efficiency was calculated; and the adsorption kinetics and regeneration for the optimized sorbent were studied. For 40 wt.% PEPA-loaded MCM-41, the CO2 adsorption capacity and amine efficiency at 60 °C were 1.34 mmol/g and 0.18 mol CO2/mol N, when the influent velocity of the simulated flue gas was 30 mL/min, which reached 1.81 mmol/g and 0.23 mol CO2/mol N after coimpregnating 10 wt.% of 2-propoxyethanol (1E). The maximum adsorption capacity of 2.16 mmol/g appeared when the influent velocity of the simulated flue gas was 20 mL/min. In addition, the additive of 1E improved the regeneration and kinetics of PEPA-loaded MCM-41, and the CO2 adsorption process showed multiple adsorption routes.

Zeolite enhances leaf photosynthesis and fruit quality in tomato through greenhouse CO2 enrichment

Elevated CO2 concentration has been widely acknowledged as a leading factor to global climate change, while deficient CO2 serves as a crucial limiting factor in modern greenhouse production. Harnessing the existing excessive CO2 to promote agriculture production is significant but filled with challenges. To this end, we proposed a concentration gradient-regulated CO2 enrichment system for capturing CO2 into greenhouses, which requires suitable CO2 sorbents with sufficient CO2 desorption capacity and high hydrophobicity at ambient temperature and pressure. Zeolites with different framework types and cations were detected by CO2 desorption and cyclic stability test under simulated agricultural production conditions. The results indicate that larger pore volume cooperated with higher Si/Al ratio and weaker alkali cations may be critical determinants for balancing high CO2 adsorption-desorption capacities and hydrophobicity in crop-cultivated environments. H-SSZ-13 zeolite is identified as the potential sorbents and exhibits exceptional CO2 release abilities and cyclic stability in tomato-grown environment. Long-term application of H-SSZ-13 zeolite to tomato plants significantly stimulated photosynthetic processes, particularly the Calvin-Benson cycle, culminating in notable improvements in plant growth, fruit yield and quality. This investigation provides a promising solution to develop a carbon-neutral CO2 enrichment system for both sustainable and productive greenhouse production.

The role of natural sorbents and piping production waste in the treatment of acid iron-containing waste water

In this article, we consider the sorption purification of production wastewater from pipe industry enterprises. We have presented and studied the potential sorbents from among natural materials and from piping production waste. The authors of this paper have studied the sorption capacity of the materials under consideration with regard to heavy metals from highly acidic iron-containing wastewater both in static and dynamic modes. The static-mode research has been conducted for various temperatures: 10°С, 20°С and 30°С. In the dynamic conditions, the filtrate flow rate equaled 0.3, 0.6 and 1.2 l/h. The authors have proven that a number of the examined materials can be used as sorbents or constituting elements of composite sorbents for the technology of wastewater treatment at pipe industry enterprises.