Ions In Wastewater Research Articles

Removal of Cd2+ by N-CNS/ZnO nanocomposite from wastewater and reuse of Cd2+-N-CNS/ZnO in blood fingerprint detection

In this study, an N-CNS/ZnO nanocomposite was used to adsorb the Cd2+ ion from an aqueous solution, and the spent Cd-loaded absorbent was reused in blood fingerprint detection. N-carbon nanosheets (N-CNS) were produced from potato peels and then coated with ZnO nanoparticles. XRD, TEM, SEM, and FTIR were used to examine the sample functionality and Surface morphology. The effect of pH, adsorbent dosage, temperature, and time was examined using ICP-OES. Removal efficiencies optimum conditions for the Cd2+ were pH 8 with 99.05 %, adsorbent dosage of 100 mg with 99,97 %, temperature (55) with 93,34 % and time (3 h) with 91,24 %. Additionally, the adsorption pseudo-second-order and Langmuir isotherm models were best fitted for Cd2+ ion removal. The maximum adsorption capacity of Cd2+ ions was 8.762 mg/g. Therefore, N-CNS/ZnO nanocomposite can remove Cd2+ ions in wastewater, and its potential for re-use in blood fingerprint detection helps eliminate secondary environmental pollution.

Non-radical activation of CaO2 nanoparticles by MgNCN/MgO composites for efficient remediation of organic and heavy metal-contaminated wastewater

Stable, cheap and environmentally friendly CaO2 was widely used to remediate environmental pollution, especially in advanced oxidation process (AOP) systems. However, its non-radical activation was still a huge challenge. In this study, the non-radical activation of CaO2 nanoparticles was realized by MgNCN/MgO composites for efficient remediation of organic and heavy metal-contaminated wastewater. The presented CaO2-based AOP system exhibited excellent degradation performance towards tetracycline (TC) and methylene blue (MB) over a broad pH range, accompanied with the weak influences of common coexisting anions and natural water sources. Singlet oxygen (1O2) was verified as the dominant active species for organics degradation, and the coordination between MgNCN and MgO in MgNCN/MgO composites played a crucial role in the non-radical activation of CaO2 nanoparticles. More importantly, the AOP system could not only degraded effectively organic pollutants, but also remove simultaneously heavy metal ions in wastewater. 100 mg/L CaO2 and MgNCN/MgO could successfully remediate the complex pollution consisting of 10 mg/L MB and 100 mg/L Cd2+. Furthermore, the degradation intermediates of MB and the solid residues after treating pollutants were analyzed in detail to reveal the degradation process and conversion products.

Recycling rare earth from ultrafine NdFeB waste by capturing fluorine ions in wastewater and preparing them into nano-scale neodynium oxyfluoride

Ultrafine NdFeB waste is a relatively clean waste produced during NdFeB magnet processing. Fluorine-containing wastewater is a common type of industrial wastewater, such as stainless steel pickling wastewater. In this work, rare earth element neodynium was recycled from ultrafine NdFeB waste by capturing fluorine ions in the fluorine-containing wastewater and prepared into neodynium oxyfluoride. The reaction process was investigated through UV-Vis-NIR, thermogravimetry/differential thermogravimetry (TG/DTG), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The neodymium hydroxide in the ultrafine NdFeB waste reacted with fluorine ions to form Nd(OH)2F, and Nd(OH)2F was then transformed into neodymium oxyfluoride after decomposition. The formed neodymium oxyfluoride is found to be particles with rhombohedral structure and a particle size of around 50 nm. The reaction kinetics of forming Nd(OH)2F was investigated. The reaction kinetic equation was established and the reaction activation energy was calculated. The effect of fluorine ion concentration on the reaction rate and products was evaluated. The results show that the reaction rate increases with the increase of fluorine ion concentration in the range of 0.01–1.5 mol/L, but it has little effect. In addition, the fluorine ion concentration affects the crystallinity of formed neodymium oxyfluoride. The recycling process not only realizes the sustainable utilization of rare earths, but also reduces the concentration of fluorine ions in the fluorine-containing wastewater, achieving two goals with one stone.

Synthesis of novel thiol-modified lysozyme coated magnetic nanoparticles for the high selective adsorption of Hg(II)

As a common heavy metal ion in wastewater, Hg(II) has high toxicity even at low concentration. In this study, a novel magnetic nano-adsorbent (FS@PTL-SH) was synthesized by modifying thiol groups on phase-transited lysozyme (PTL) coated magnetic nanoparticles. FS@PTL-SH exhibited superior adsorption performance for Hg(II) in a wide pH range. The maximum adsorption capacity of FS@PTL-SH fitted by Langmuir model could reach 1001.21 mg/g at 298 K, and 90% of the equilibrium uptake could be achieved within 5 min. The interference of inorganic ions and organic complexing agents was limited even at high concentrations. High adsorption selectivity of Hg(II) was observed in the mixed solution containing various heavy metal ions. Moreover, FS@PTL-SH could still maintain above 90% of the adsorption capacity after five adsorption–desorption cycles. For the mechanisms, the adsorption of FS@PTL-SH for Hg(II) was mainly relied on the strong complexation of the surface functional groups, especially thiol groups.

In-situ growth of COF on BiOBr 2D material with excellent visible-light-responsive activity for U(VI) photocatalytic reduction

• The removal strategy was the combination of complexation and photoreduction. • BiOBr@TpPa-1 heterojunction hybrids were prepared. • The extended π-conjugated system could improve the photocatalytic performance. • TpPa-1 and BiOBr@TpPa-1exhibited the high efficiency of U(VI) photoreduction. By integrating of adsorption and photoreduction for uranium(U), the covalent organic frameworks (COF, TpPa-1) and the heterostructure BiOBr@TpPa-1 were investigated. The results of electron spin resonance and photoelectrochemical tests (UV–vis DRS, PL, EIS, I-t and Mott-Schottky plots) showed, TpPa-1 not only was provided with oxygen vacancies, which could act as inter-band level to enhance visible light capture and reduce the recombination of photogenerated carriers, but also possessed π-electron conjugated structure, which could broaden the spectral absorption range and prolong the lifetime of photo-generated charges by surface hybridization. Consequently, the in-situ formation of TpPa-1 on BiOBr surface can significantly improve the photocatalytic performance of BiOBr for U(VI) reduction. Under visible-light irradiation, the superior photocatalytic performance of BiOBr@TpPa-1 generated reactive oxygen species and photoelectrons, which can efficiently reduce U(VI) pre-enriched in the framework of TpPa-1. Approximately 91% of U(VI) was photo-reduced within 540 min. Meanwhile, combined with surface analysis techniques (SEM, TEM, XRD and XPS) to reveal the mechanism of U(VI) photoreduction. Thus, the application of COFs as photocatalytic reductant was expanded, providing a sustainable alternative for visible-light-driven the conversion of high valent radionuclide ions in wastewater.

Simulation Study of Copper Ions in Wastewater by using Rice Husks Ash

Simulation Study of Copper Ions in Wastewater by using Rice Husks Ash

Highly sensitive B, N co-doped carbon dots for fluorescent and colorimetric dual-mode detection of mercury ions in wastewater

Mercury ions (Hg2+) owing to excessive discharge cause serious damage to human health and the water ecosystem via bioaccumulation in food chains. Novel materials employed for the high-performance monitoring of Hg2+ are urgently required. Herein, using sucrose, boric acid, and melamine as raw materials, a new nanomaterial sensor, namely boron and nitrogen co-doped carbon dots (B, N-CDs), was designed for fluorescent and colorimetric dual-mode detection of Hg2+. Because of the occurrence of both dynamic and static quenching, B, N-CDs were utilized to function as fluorescent sensors for detecting Hg2+ with a limit of detection (LOD) of 5.3 nM. B, N-CDs performed an action for catalytic oxidation of 3,3′,5,5′-Tetramethylbenzidine (TMB) to a blue cationic radical via peroxidase mimetic activity. By sequentially adding cysteine and Hg2+ to control the emergence of the TMB cation radical, a sensor for the Hg2+ assay was established through the colorimetric "on-off-on" signal and the LOD was as low as 7.8 nM. Moreover, the application potential of B, N-CDs for complex water environments was demonstrated to be excellent. In summary, the dual-mode detection method delivers some valid strategies for the detection of mercury in aqueous solutions employing the functional nanomaterials mentioned, and opens new avenues in tackling the problem of heavy metal ion pollution for environmental monitoring and remediation.

Modification of Fishbone-Based Hydroxyapatite with MnFe<sub>2</sub>O<sub>4</sub> for Efficient Adsorption of Cd(II) and Ni(II) from Aqueous Solution

Due to their toxicity, Cd(II) and Ni(II) ions in the environment are severe. The hydroxyapatite composite was improved with magnetic MnFe2O4 to remove Cd(II) and Ni(II) ions from an aqueous solution. Hydroxyapatite was extracted from Snakehead (Channa striata) fish bones via alkaline-heat treatment. The hydroxyapatite/MnFe2O4 composite performance was analyzed through XRD, FTIR, SEM-EDS, BET analysis, and VSM, and the results reveal that the hydroxyapatite/MnFe2O4 composite shows good magnetic properties of 21.95 emu/g. The kinetics evaluation confirmed that the pseudo-second-order kinetics model was more suitable to describe the adsorption of Cd(II) and Ni(II) ions by hydroxyapatite/MnFe2O4 composite from the solution. The Langmuir isotherm model was suitable to describe the adsorption process of the Cd(II) and Ni(II) ions, where the adsorption capacities for Cd(II) and Ni(II) are 54.3 and 47.4 mg/g, respectively. Desorption of Cd(II) and Ni(II) ions from hydroxyapatite/MnFe2O4 composite using NaCl as the eluent was more effective than EDTA. The findings of this study indicate that hydroxyapatite/MnFe2O4 can reduce Cd(II) and Ni(II) ions in wastewater so that it can recover natural resources.

High-performance TFNC membrane with adsorption assisted for removal of Pb(II) and other contaminants

Rapid and thorough removal of heavy metal ions in wastewater is critical for the urgent need of clean water. Herein, we prepared a high-performance thin film nanofibrous composite (TFNC) membrane consisting of a polyacrylonitrile (PAN)-UiO-66-(COOH)2 composite nanofibrous substrate (CPAN) and a calcium alginate (CaAlg) skin layer. Owing to abundant adsorption sites of UiO-66-(COOH)2 MOF, the optimal CPAN-2 nanofibrous substrate showed excellent adsorption capacity for lead ions. The maximum Pb2+ adsorption capacity of CPAN-2 substrate calculated by Langmuir isotherm model was 254.5 mg/g. Meanwhile, due to the relatively loose structure of CaAlg skin layer, this TFNC membrane showed high water permeate flux about 50 L m−2h−1 at 0.1 MPa, and the rejection for dyes was higher than 95%. Therefore, CaAlg/CPAN TFNC membranes were appropriate for dynamic adsorption/filtration to remove Pb2+. Compared with original CaAlg/PAN membrane, the optimal CaAlg/CPAN TFNC membrane showed much better ability to treat Pb(II)-containing wastewater and had good recyclability. Most importantly, the CaAlg/CPAN TFNC membrane could treat 7659 L m−2 wastewater containing single lead ions under WHO drinking water standard, and effectively deal with more simulated lead-containing wastewater. This work could provide a substitutable solution for effective removal of heavy metal ions and other various contaminants in wastewater.

Recycling of residual valuable metals in cyanide-leached gold wastewater using the N263-TBP system

In this study, the synergistic extraction system of trioctylmethyl ammonium chloride (N263)-tributyl phosphate (TBP)-n-octanol-sulfonated kerosene was used to enrich and recover valuable metals from cyanide gold extraction of wastewater. The effects of the proportion of N263 and TBP, contact time, initial pH of water phase, temperature, and phase ratio (O/A) on the extraction percentage of metal cyanide complex ions and the synergistic extraction reaction mechanism were mainly investigated. Results showed that the single-stage extraction percentages of Cu, Zn, and Fe ions in wastewater were 99.87%, 99.8%, and 96.2%, respectively, and the saturated extraction capacity was 4356.4 mg/L under the conditions of N263 (20 vol%)-TBP (20 vol%)-n-octanol (10 vol%)-sulfonated kerosene system at 25 °C, O/A of 1:1, pH of 10, and contact time of 5 min. Fourier transform infrared spectroscopy (FT-IR) and electrospray ionization mass spectrometry (ESI-MS) analyses showed that metals entered the organic phase in the form of metal cyanide complex ions during extraction. Metal cyanide complex ions preferentially combined with TBP to lose hydrophilicity and then reacted with N263 cations to enter the organic phase. The saturated organic phase was stripped by NaOH and NaSCN mixed solution, and the total concentration of metal ions in the stripping solution reached 11,996.6 mg/L.

Electrochemical deposition of uranium oxide with an electrocatalytically active electrode using double potential step technique

The development of effective uranium-removal techniques is of great significance to the environment and human health. In this work, a double potential step technique (DPST) was applied to remove U(VI) from uranium-containing wastewater using a carbon felt electrode modified by graphene oxide/phytic acid composite (GO-PA@CF). The application of DPST can inhibit water splitting and prevent GO-PA from adsorbing other interfering ions in wastewater. The GO-PA composite can effectively accelerate the electrochemical reduction rate of U(VI), which significantly improved the electrochemical deposition rate of uranium oxide. As a result, the maximum removal efficiency and maximum removal capacity of GO-PA@CF electrode reached 98.7% and 1149.3 mg/g, respectively. The removal efficiency remained 97.2% after five cycles of reuse. Moreover, the removal efficiency of GO-PA@CF electrode can reach more than 70% in simulated wastewater.

Hydrodynamics and adsorption performance of liquid–solid fluidized bed with granular activated carbon for removal of copper ions from wastewater

The removal of copper ions from wastewater is of great significance for reducing pollution of surrounding environments and ensuring the quality of drinking water. In this study, a liquid–solid fluidized bed with nutshell activated carbon was used to adsorb copper ions from wastewater. The fluidization characteristics and adsorption performance of the liquid–solid fluidized bed were investigated through batch, cyclic, and continuous adsorption experiments. The results showed that nutshell activated carbon had a strong adsorption capacity for copper ions in wastewater by the electrostatic adsorption function of its oxygen-containing groups, and the adsorption isotherm was fitted by the Langmuir isotherm model (R2 reached 0.98), which indicated a positive single-layer adsorption. The pseudo-second-order model described the adsorption process well, and the adsorption process was controlled by a continuous migration step with internal and external diffusion. The high-frequency contact between adsorbent and adsorbate in the fluidized bed layer increased its external diffusion rate, thereby promoting improved adsorption efficiency of 96% compared with 76% of the packed bed. The weight of the particle bed was the factor influencing adsorption performance the most, followed by fluidization number, and then initial concentration, indicating that the fluidization characteristics determined the adsorption efficiency. The breakthrough curve showed that the adsorption saturations of the fluidized and packed bed were 0.694 and 0.660 g/g, respectively, which demonstrated the superiority of the fluidized bed in the adsorption process.

Comparison of bismuth ferrites for chloride removal: Removal efficiency, stability, and structure

The chloride (Cl−) ions in wastewater are difficult to remove, since there is a lack of effective and recyclable chloride removal agents. In this study, the bismuth ferrites (BFO) are first explored as chloride removal agents, and their oxidation or precipitation effects on the Cl− removal are studied. In the BFO samples, the crystal phases of BiFeO3 and Bi2FeO4 have very limited contributions to the Cl− removal, while the enhanced removal ability is exhibited with the increase of Bi25FeO40. When the mass percentage of Bi25FeO40 reaches 70%, high Cl− removal efficiencies of 80–90% are achieved, which even exceeds 95% for pure Bi25FeO40. The morphology and structure characterizations reveal that the excellent Cl− removal performance of Bi25FeO40 is determined by its unstable chemical structure due to the sharing of Bi5+ and Fe3+ ions in the tetrahedral positions. The density of states and electron localization function of Bi25FeO40 demonstrate that its Fe and O bonding is weaker than those of BiFeO3 and Bi2FeO4, resulting in the easier breaking of the Fe3+/Bi5+-O bonds to release Bi5+ ions, which have oxidation ability for the formation of OH and Cl radicals to enhance the Cl− removal efficiency.

Adsorption efficiency of glycyrrhiza glabra root toward heavy metal ions: Experimental and molecular dynamics simulation study on removing copper ions from wastewater

• Glycyrrhiza glabra root is effective for removing copper ions from wastewater. • Adsorption is confirmed by (EDS) and (FTIR) analyses. • Effect of biosorbent and solution characteristics are studied. • Adsorption is exothermic, reduces entropy and is described by Freundlich isotherm. • Simulations show hydroxyl functional groups have the dominant role in adsorption. Heavy metal ions in wastewater are a major source of water and soil pollution. In this study, glycyrrhiza glabra root is introduced as a novel biosorbent for removing copper ions from wastewater. The adsorption parameters (biosorbent dosage, biosorbent size, contact time, initial copper ion concentration, ionic strength and pH), as well as the adsorption isotherms and thermodynamics, are studied. Molecular dynamics is also applied to simulate the adsorption using LAMMPS. Maximum adsorption occurs at the early stage (5 min) the biosorbent comes into contact with the solution containing copper ions. Results also indicate that the maximum adsorption capacity is 181.6 mg/g for the solution with the initial concentration of 400 mg/L. Energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared analysis (FTIR) confirm the adsorption. Adsorption isotherms are best described by the Freundlich model, and the adsorption is found to be exothermic and entropy-decreasing. Molecular dynamics simulations of the non-bonding interactions between the biosorbent oxygens and the copper ions show that the oxygen atoms of hydroxyl functional groups (R - O - H) are most influential in the adsorption. The results of the study could suggest the cultivation of glycyrrhiza glabra as a cheap and environmentally friendly biosorbent for wastewater treatment.

Synthesis of a novel Poly-chloromethyl styrene chelating resin containing Tri-pyridine aniline groups and its efficient adsorption of heavy metal ions and catalytic degradation of bisphenol A

A new type of poly-chloromethyl styrene chelating resin (CPS-TA) containing tri-dipyridine aniline side group was synthesized from poly-chloromethyl styrene (CPS) and 4′-(4-aminophenyl)-2,2′:6′,2-tri-pyridine. The results of batch adsorption experiments show CPS-TA chelating resin has excellent adsorption capacity for Cu (II), Ni (II), and Pb (II), and the maximum adsorption capacity is 5.02, 3.38, and 1.27 mmol/g, respectively. The thermodynamic parameters indicate that the CPS-TA chelating resin adsorption for ions is a spontaneous process. CPS-TA chelating resin has good repeated use performance, and the CPS-TA-Cu formed after adsorption has excellent catalytic performance for H2O2 degradation of bisphenol A. The paper simulates the adsorption process through column experiments, indicating CPS-TA chelating resin could be used to adsorb and enrich heavy metal ions in wastewater, which provides a new way to effectively solve the problem of treating wastewater that contains heavy metal ions.

Polypyrrole deposited electrospun PAN/PEI nanofiber membrane designed for high efficient adsorption of chromium ions (VI) in aqueous solution

Chromium (Cr (VI)) is one of the heavy metals that seriously endanger human health and the environment. It is a huge challenge to develop high-efficiency adsorbents with low cost, simple preparation method and green production technique and zero pollution to the environment. In this work, electrospinning technology was used to prepare polyacrylonitrile/polyethyleneimine (PAN/PEI) electrospinning nanofiber membranes (ENM), and then polyacrylonitrile/polyethyleneimine/polypyrrole (PAN/PEI/Ppy) composite nanofiber membrane (CNM) was successfully synthesized by chemical depositing polypyrrole (Ppy) on the surface of PAN/PEI ENM. PAN/PEI ENM provided a larger specific surface area, which facilitated better and more uniform deposition of Ppy on the surface of nanofiber membranes. Scanning electron microscope (SEM) and transmission electron microscope (TEM) images showed that the prepared PAN/PEI/Ppy CNM looked like "balsam pear", and had high adsorption capacity of Cr (VI), with a maximum adsorption capacity of 368 mg g -1 . After five times of adsorption-desorption, the removal of Cr (VI) reached more than 95%. More importantly, compared to the current complex chemical synthesis of Cr (VI) ion adsorbents and secondary pollution to the environment, electrospinning fully demonstrates the huge technical advantages of industrial applications, including high efficiency, simple preparation, and green (no harmful chemical by-products), low cost, no secondary pollution. PAN/PEI/Ppy CNM will be promising solid adsorbent candidates for the removal of Cr (VI) ions in wastewater.

Highly efficient as-synthesized and oxidized multi-walled carbon nanotubes for copper(II) and zinc(II) ion adsorption in a batch and fixed-bed process

In this work, the optimization of temperature, argon gas flow rate, acetylene gas flow rate and time effect on the yield of as-synthesized multi-wall carbon nanotubes (AS-MWCNTs) using a novel iron-nickel/biochar catalyst was investigated. Subsequently, the AS-MWCNTs were functionalized to obtain oxidized multi-wall carbon nanotubes (OX-MWCNTs). The nanoadsorbents were applied for Cu(II) and Zn(II) ions adsorption from wastewater in a batch and fixed-bed process. Remarkably, the results revealed optimum AS-MWCNTs yield (280%) at the following experimental conditions; temperature (725 °C), argon gas flow rate (250 mL/min), acetylene gas flow rate (180 mL/min) and time (75 min). OX-MWCNTs demonstrated higher surface area of 1210 m 2/g compared to AS-MWCNTs (1140 m 2/g). The optimum removal of Cu(II) and Zn(II) ions were obtained at pH (6), contact time (30 min), adsorbent dosage (20 mg/L), initial metal concentration (Cu(II) (75 mg/L) and Zn(II) (80 mg/L)) and temperature (45 oC). Maximum adsorption capacities for Cu(II) and Zn(II) ions removal by AS-MWCNTs were obtained as 364.66 and 347.01 mg/g, while OX-MWCNTs produced higher maximum adsorption capacities of 416.47 and 411.88 mg/g. The experimental data were better fitted by Langmuir isotherm and pseudo-second order kinetics, while thermodynamic investigation revealed a favorable and spontaneous chemisorption controlled adsorption of metal ions. Furthermore, the breakthrough curves of Cu(II) and Zn(II) ions was suitably modelled by Thomas kinetic model. Accordingly, AS-MWCNTs and OX-MWCNTs indicate a promising choice to eliminate Cu(II) and Zn(II) ions in wastewater due to its stability, high efficiency, environmental friendliness and excellent recyclability capacity.

Application research on the adsorption of Cu 2+ ions in wastewater by hydroxyl‐ or amino‐terminated polyamines

The adsorption properties of hydroxyl- or amino-terminated polyamines for Cu2+ ions are studied in detail by adopting the batch method, and the effects of main imprinting conditions, such as the concentrations of Cu2+ ions, temperature, pH and the amount of N are examined. The results showed that adsorption capacity increased with the increase of the number of N in the functional groups. The kinetic of the reaction is very rapid and follows the pseudo-second order and clearly indicated that both the Langmuir and Freundlich models could describe the Cu2+ ions adsorption on aminated mesoporous materials well. Hence, the reported mesoporous materials herein hold great potential to remove Cu2+ ions from aqueous solutions.

High surface area Cu2ZnSnS4 nanosheets synthesized by microwave irradiation method: A material for detecting ammonia-ammonium ions in wastewater

A highly sensitive and selective electrochemical sensor based on porous Cu2ZnSnS4 (CZTS) nanosheets is required for detecting ammonia-ammonium ions (NH3–NH4+). Porous CZTS nanosheets synthesized by microwave irradiation method were characterized by Raman, XRD, SEM, TEM, BET, DLS and NH3-TPD. The porous nanosheets of CZTS-30 irradiated for 30 min with a surface area of 51.3 m2 g−1 are significant material and possess many important active sites for NH3–NH4+ oxidation. The electrode was made of a glassy carbon electrode (GCE) modified by CZTS-30. It was revealed by electrochemical measurements that there were two linear ranges for NH3–NH4+. One was the high concentration ranging from 1.0 mM to 600.0 mM (R2 = 0.9989) with a sensitivity of 8.29 μA mM−1 cm−2, and the other was the low concentration between 0.1 mM and 1.0 mM (R2 = 0.9990) with a high sensitivity of 96.14 μA mM−1 cm−2. It showed a detection limit of 30 μM (S/N = 10) for the sensor in NH3–NH4+ solution mixed with 0.5 mM H2SO4 at a fixed scan rate of 20 mV s−1. This sensor also demonstrated desirable stability, reversibility and selectivity to NH3–NH4+. The CZTS/GCE is believed to become a new candidate structure for the electrochemical detection of NH3–NH4+.

The Ability of Edible Fungi Residue to Remove Lead in Wastewater

Lead (Pb)-contaminated wastewater is the most common source of heavy metal ion pollution. In this study, agricultural waste edible fungi residue (EFR) was used to adsorb Pb(II) ions in wastewater as a strategy to reduce environmental pollution and minimize poisoning by Pb. The influence of Pb(II) concentration, solution pH, and EFR concentration on the removal efficiency (R) of Pb(II) was investigated with single factor design and response surface analysis. The maximum predicted R for Pb(II) was 76.34% under optimal conditions of Pb(II) concentration of 483.83 mg/L, EFR concentration of 4.99 g/L, and pH of 5.89. The actual experimental value of R reached 76.97% under these conditions. The competition of Pb(II) ions for the available adsorption sites on EFR limited the maximum R. A comparison of Fourier transform infrared spectroscopy before and after the adsorption of Pb(II), indicated that the functional groups of EFR significantly affected the effect of adsorption of heavy metals, and that the adsorption process was primarily affected by functional groups in the range of wavenumbers from 500 to 2,000 cm−1.