ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 31
·77488-77498
·
IF 5.8
Lan Bingyan,Hao Chenhui,Zhang Mengze,Yan Xiaomin
Two in situ formed Fe(III) oxyhydroxides (FeO x ) originated from ferrate reduction (designated FeO x –Fe VI ) and ferrous oxidation by H 2 O 2 (designated FeO x –Fe II ) were compared in the aspects of morphology, hydrolyzed species, surface binding mechanism of lead. The theoretical maximum adsorption capacity calculated from the Langmuir model toward Pb(II) was 929.54 and 810.37 mg/g Fe by FeO x –Fe VI and FeO x –Fe II , respectively. At pH 6 and the same Fe/Pb ratio, the kinetic rate of Pb removal by the FeO x –Fe VI process was 8 times faster. FTIR, SEM, and Ferron assay suggest FeO x –Fe VI was associated with a lesser polymerization degree and contained more reactive hydroxyl-Fe polymers than those in the FeO x –Fe II sample. SAXS verified that the particles possessed a smaller, more homogeneous, and open structure when Fe was hydrolyzed by ferrate reduction than ferrous oxidation. XPS coupled with fractal analysis suggests the different sorption capacities of Pb(II) can be ascribed to their distinct growth patterns. Fast cluster agglomeration during FeO x –Fe II fabrication decreased the exposure of effective adsorption sites. In comparison, the incompact assemblies of FeO x –Fe VI clusters facilitated Pb(II) ions to access the interstices of octahedral FeO 6 units and formed an edge-sharing complex. This work provides new insight into mechanisms of particle fabrication and heavy metal removal of Fe(III) formed in situ.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2022
·
IF 2.455
Zhi-Ke Wang,Ting-Ting Li,Hai-Tao Ren,Hao-Kai Peng,Bing-Chiuan Shiu,Jia-Horng Lin,Ching-Wen Lou
In this study, a hydrogel composite adsorbent structure was reported and showed satisfactory adsorption performance. The study uses polylactic acid melt-blown nonwoven fabric to optimize and improve the adsorption performance of the hydrogel. The results show that the nonwoven fabric structure enables the composite material to reach the swelling equilibrium faster than the hydrogel. The adsorption-isotherm model found that the adsorption capacity of composite materials Pb(II) and Ni(II) reached 416.07 and 243.10 mg/g, respectively, and still had high removal efficiency at low pH. The composite material has low cost and can be reused, which solves the problems of difficulty in recovery of the hydrogel adsorbent, low strength, and easy damage, and promotes the industrialization of the hydrogel as an adsorbent.
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SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
·
2021
·
IF 3.752
Yujie Chen,Man He,Beibei Chen,Bin Hu
A novel thiol-grafted magnetic polymer (MPPs-SH) was synthesized by “click reaction” between 1,2-ethanedithiol and Fe 3 O 4 @SiO 2 @poly (ethylene glycol dimethacrylate -co- glycidyl methacrylate). The resultant MPPs-SH had high S content (5.4 wt%) and exhibited large specific surface area (156.8 m 2 g −1 ) as well as high adsorption capacity of 254, 64.2, 56.6 mg g −1 for mercury, cadmium and lead ions , respectively. With the prepared MPPs-SH as sorbent , a method of magnetic solid phase extraction combined with inductively coupled plasma mass spectrometry was developed for the quantification of trace mercury, cadmium and lead in environmental water samples. The extraction conditions including sample pH, sample volume, sorbent amount, adsorption/desorption time and elution volume were optimized. Under the optimal conditions, three heavy metal ions were extracted from 150 mL aqueous solution in 10 min and eluted by 0.2 mol L −1 HNO 3 containing 2% thiourea in 5 min. The method presented low limits of detection (0.21, 0.82 and 2.9 ng L −1 ) for target ions. The accuracy of the method was validated by using Certified Reference Materials of Environmental Water including GSB 07–1185–2000 (201435), GSB 07–1183–2000 (201239) and GSB 07–3173–2014 (202046). The application potential was further validated by the determination of trace mercury, cadmium and lead in Yangtze river and East lake water samples. The content of target heavy metal ions in tested water sample was found to be in the range of 6.40–195 ng L −1 , and the recoveries of 86.4–109% were obtained at three spiking concentration levels for mercury, cadmium and lead ions.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Tao Jian,Yongjin Fang,Xiang Cai,Mingyi Ying,Bisheng Li,Wangyang Ye,Liguo Shen,Leihong Zhao,Hongjun Lin
The development of high-performance membranes for heavy metal remediation remains a key challenge in advanced water treatment. In this work, a hierarchically structured composite membrane was fabricated via a self-confined growth strategy, in which Zn(OH) 2 nanostrands immobilized MoS 2 and directed the in-situ growth of ZIF-8, forming a defect-free interlayer for robust polyamide (PA) deposition. The resulting ZM15-PA membrane exhibits a highly hydrophilic surface with a contact angle of 31.5°, a strong positive surface charge under acidic conditions, and excellent water permeability reaching 83.5 L m -2 h -1 . Most notably, the membrane achieves an ultrahigh Pb(II) rejection rate of 99.2%, consistently reducing effluent concentrations to less than 10 μg L -1 , even in the presence of coexisting ions and dissolved organic matter. Mechanistic investigations reveal that Pb(II) removal is governed by synergistic mechanisms including electrostatic repulsion, molecular sieving, and coordination interactions involving Pb-S, Pb-O, and Pb-N bonds. Furthermore, the membrane demonstrates outstanding antifouling resistance, long-term operational stability, and antibacterial efficiency exceeding 99% under photo-Fenton conditions. These findings highlight the promise of self-confined growth strategies for stabilizing two-dimensional materials and developing multifunctional membranes for selective heavy metal removal in complex water matrices.
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Toxics
·
2026
·Vol. 14
·期 10
·914
·
IF 4.9
Jiajun Feng,Qimiao Huang,Junyuan Liang,Yuyuan Chen,Qiuhua Huang,Zihong Jiang,Peixuan Chen,Jian Kang,Xiang Li
Red inorganic pigments traditionally rely on Pb-, Cd-, Hg-, or Cr(VI)-based colourants that carry avoidable hazard and exposure risks. Here, a family of Sr6YAl1−xFex(BO3)6(0 ≤ x ≤ 1) pigments was prepared by solid-state reaction using Fe3+as the chromophore and no Pb-, Cd-, Hg-, Cr(VI)-, or As-containing precursors. X-ray diffraction shows that the trigonal Sr6YAl(BO3)6-type framework (space group R-3) is retained as a single phase throughout the series; on the basis of isovalent charge, six-coordinate geometry and matched ionic radii, Fe3+substitutes for octahedral Al3+to form a continuous solid solution, and SEM-EDS mapping confirms a broadly homogeneous, single-phase Fe-containing borate. Increasing Fe content strengthens visible absorption and moves the colour from white to a light reddish-orange (warm tan), with the x = 1 end member givingL* = 69.69,a* = 10.08,b* = 12.79 andC* = 16.28. The colour is essentially unchanged in water and dilute acetic acid, shows a moderate shift in alkaline media (ΔE* = 8.05–10.21), and changes markedly only in 0.1 mol L−1HCl (ΔE* = 15.07). Elemental release was screened by immersing 1.00 g of powder in 50 mL of water (H1), 0.01 mol L−1acetic acid (H2) or 0.1 mol L−1HCl (H3) for 24 h at room temperature, with each leachate read three times by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Water and dilute acid gave similar, modest release, whereas HCl mobilized substantial B, Sr and Y (530.72, 4639.42 and 470.54 mg L−1, i.e., up to 41.87%, 45.15% and 27.08% of the nominal inventory) but very little Fe (0.156 mg L−1, only ≈0.014% of the Fe inventory, and below detection in H1 and H2). The Fe chromophore is thus effectively immobilized even when the borate framework is attacked, decoupling colouration from chromophore leaching. The pigments demonstrate source-level elimination of regulated toxic metals together with strong chromophore retention; the non-standardized extraction provides a conservative release-potential screen rather than a regulatory compliance determination.
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MINERALS ENGINEERING
·
2022
·
IF 5.479
Lianghua Wang,Pingfeng Fu,Yanhong Ma,Xuejin Zhang,Yabao Zhang,Xiumin Yang
Flotation reagents and heavy metal ions always coexist in mineral flotation wastewaters, arousing serious environmental issues or having deleterious effects on mineral flotation. In this work, the steel slag was adopted as a cost-effective adsorbent to synergically remove butyl xanthate (BX), diethyl dithiocarbamate (DDTC), Cu(II) and Pb(II) ions. At the steel slag dosage of 12.0 g/L, Cu(II) and Pb(II) concentrations decreased from 4.0 mg/L to below 10.0 μg/L, and the removal of COD reached 54.33%. The removal efficiency of COD increased from 11.36% to 57.49% as Cu(II) and Pb(II) concentrations rose from 0 to 8.0 mg/L, revealing the promotion effects of metallic ions on collector adsorption. The maximum uptake capacity of steel slag reached 110.45 and 160.48 mg/g for Cu(II) and Pb(II), respectively. The collector adsorption capacity of steel slag increased nearly two magnitudes after modifying with the uptake of Cu(II) or Pb(II) ions. The SEM/EDS, XPS and FTIR analysis indicated that steel slag could be in-situ modified to generate copper or lead hydroxides and oxides during the removal of Cu(II) and Pb(II) ions. Subsequently, these precipitates acted as reactive sites for chelating BX and DDTC to form indissolvable metal-collector chelates. Owing to in-situ modification of steel slag by uptaking metallic ions, the adsorption was potentially feasible for treating flotation wastewaters.
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Advanced Energy Materials
·
2024
·Vol. 14
·期 26
·2401114
·
IF 24.4
Qin Li,Junjie Ma,Xuanchen Xu,Peng Gao,Meng Cai,Mengqi Han,Jing Yang,Yiqiang Zhang,Yanlin Song
The improvement of photovoltaic and stability performance of tin (Sn)-based halide perovskite solar cells is impeded by notorious oxidation issues and Anderson localization. Despite previous implements in antioxidation through the incorporation of Lewis base additives, there still exist ongoing uncertainties surrounding its complex interaction mechanisms. A perplexing phenomenon regarding accelerated oxidation in acrylic acid is discovered that deviates from conventional Lewis base–acid reaction. The underlying insights into the deprotonation of acrylic acid followed by the formation of a “tripod” ionic bonding form are provided, which results in amplifying the delocalization effect of electrons of Sn 2+ . Furthermore, with the assistance of acrylamide and acrolein, synergistic enhancement in terms of the antioxidation and suppression of Anderson localization can be achieved — a concept referred to as “Dual Synergistic Engineering”. This suppresses the oxidation of Sn 2+ and reduces Sn 4+ content by ≈76%. Meanwhile, the diffusion length is prolonged significantly from 195.9 to 458.9 nm. The optimized all-inorganic Sn/Pb-based perovskite solar cells exhibit a power conversion efficiency of above 14% with enhanced stability. These findings provide an alternative viewpoint for comprehending the impact of chemical interaction on oxidation and crystal growth in Sn/Pb-based perovskites.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 9
·2360-2367
·
IF 5.256
Lingang Li,Fan Zhang,Yuying Hao,Qinjun Sun,Zhanfeng Li,Hua Wang,Yanxia Cui,Furong Zhu
One-step solution fabrication of high-performance Sn-including perovskite solar cells (PSCs) is very challenging due to the rapid crystallization of the Sn-based perovskite layer, leading to a poor film morphology and low surface coverage. In this work, a well-controlled one-step method, assisted by a multi-step solvent treatment, is developed for the growth of a high-quality CH3NH3Pb(1−x)SnxI3 (0 ≤ x ≤ 1) perovskite film on a planar PEDOT:PSS substrate. The CH3NH3Sn0.25Pb0.75I3 perovskite films consisting of densely packed and uniformly distributed large crystal grains were obtained using sec-butyl alcohol solvent engineering and N,N-dimethylformamide solvent annealing under an N2 atmosphere. The CH3NH3Sn0.25Pb0.75I3-based PSCs with a maximum power conversion efficiency (PCE) of 12.08% and an average PCE of 11.01% were obtained. The PSCs also exhibit excellent performance reproducibility, good air stability and weak hysteresis behavior. The enhancement in the performance of the PSCs is attributed to the well-crystallized CH3NH3Sn0.25Pb0.75I3 film, resulting in simultaneous improvement in charge–carrier transport properties and reduction in charge–carrier recombination, a very promising approach to obtain high performance Sn-including perovskite solar cells.
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Desalination and Water Treatment
·
2024
·
IF 1
Gongduan Fan,Jing Luo,Israel de Jesus Lopez Prieto,Rujing Lin,Xiaomei Zheng,Liang Hong
The synthesis conditions of zeolitic imidazolate framework-8 (ZIF-8) have been optimized by a response surface method using central composite design (CCD) to obtain the high adsorption capability for the Pb(II) removal in aqueous solution. The physic-chemical properties of the as-prepared ZIF-8, such as morphology, structure and chemical composition, were characterized by field emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (XRD) and energy-dispersive X-ray photoelectron spectroscopy (XPS), respectively. The adsorption capability, influence factors, isotherms, thermodynamics, kinetics and mechanism of Pb(II) in aqueous solutions were investigated. The optimal parameters of which have the highest adsorption capability for Pb(II) were 200 mL of water as the solvent, and the molar mass ratio of 2-methylimidazole and Zn(NO 3 ) 2 ·6H 2 O was 45.63. At this condition, the as-prepared ZIF-8 was a pure hexagonal three-dimensional crystal structure. The equilibrium adsorption capacity up to 668 mg/g for 300 mg/L of initial Pb(II) solutions and the adsorption was a spontaneous process. The largest adsorption capacity from Langmuir isotherm model was 686.25 mg/g. The adsorption kinetics followed the pseudo-second-order model. The equilibrium adsorption time and the optimal adsorption pH was 4 h and 6.0–7.0, respectively. The ZIF-8 still kept well adsorption effect after three times of usage. Therefore, this study showed that ZIF-8 is a promising sorbent for removing environmental pollutants.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124422
·
IF 7.5
Wenjun Fu,Jiangjie Fang,Yongdian Yue,Xinzhuang Fu,Chuanxi Peng,Di Chen,Youchuan Chen,Tong Yue
Calcium silicate-based materials hydrate to form calcium silicate hydrate (C-S-H), a reactive phase capable of immobilizing heavy metals. However, the mechanisms governing element-specific long-term stability remain unclear. In this study, dicalcium silicate (C 2 S) and tricalcium silicate (C 3 S) were used to compare the removal behavior, aging stability, and microscopic immobilization mechanisms of Pb(Ⅱ) and Cd(Ⅱ) in aqueous systems. Both minerals efficiently removed Pb(Ⅱ) and Cd(Ⅱ), while C 3 S showed stronger early Pb(Ⅱ) removal, possibly related to faster hydration-product formation under the tested conditions. Cd(Ⅱ) removal remained above 99% in both systems. Apparent isotherm and kinetic analyses indicated that metal removal was governed by a coupled apparent process involving interfacial adsorption, surface complexation, hydration-product formation, and precipitation, rather than by physical adsorption alone. Long-term aging and acidic leaching tests revealed contrasting stability: Cd-bearing products exhibited strong leaching resistance, whereas Pb-bearing products showed a potential risk of re-release after aging. XRD, XPS, TEM, and TEM-EDS analyses indicated that Pb and Cd were closely associated with C-S-H-related hydration products, suggesting possible Ca-associated binding or partial structural incorporation. The stronger acid-leaching resistance of Cd-bearing products implies more stable association with C-S-H-related phases than that of Pb-bearing products. These findings clarify the element-specific immobilization mechanisms of C 2 S/C 3 S and provide guidance for calcium silicate-based treatment of heavy-metal-contaminated water.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Linrui Li,Peisen Huang,Yubo Pan,Xianyong Hong,Yu Tao,Zhihui Wang,Mingxing Shi,Yu Xia,Mingzhu Xia,Fenghe Wang,Fengyun Wang,Wu Lei
Water pollution by heavy metals poses severe threats to ecosystems and human health. While adsorption offers a promising remediation strategy, the practical application of conventional powdered adsorbents is hampered by poor recyclability, handling difficulties, and limited scalability. To address these challenges, we report a novel adsorbent fabricated by crosslinking carboxymethyl cellulose (CMC) with ethylenediamine tetra(methylene phosphonic acid) (EDTMP), a chelating agent with superior heavy metal affinity. This adsorbent (EDT-CMC) exhibits adsorption capacities of 640.4 ± 9.4 mg/g for Pb 2+ and 401.2 ± 8.2 mg/g for Cd 2+ at 298 K, representing increases of 95.8 ± 7.9% and 96.6 ± 10.5%, respectively, compared to EDTMP-absent adsorbents. Systematic investigations of adsorption kinetics, isotherms, and thermodynamics were conducted, complemented by comprehensive characterizations (XRD, FT-IR, SEM, XPS). The material demonstrates good tolerance to pH variations and competing ions, along with promising performance in fixed-bed column and recyclability studies, underscoring its potential for practical applications. Mechanistic studies reveal that surface complexation and ion exchange are the primary drivers of metal removal, with electrostatic interactions playing a secondary role, a conclusion further validated by density functional theory (DFT) calculations. This work offers two key advancements, the first being a spherical bead-like architecture that overcomes the recyclability and handling limitations of traditional powdered adsorbents, enabling practical fixed-bed applications, and the second is a comprehensive mechanistic elucidation combining experimental characterizations with DFT calculations, providing molecular-level insights into the adsorption process. Overall, EDT-CMC was expected to be an effective adsorbent to apply in the field of heavy metal removal.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Tao Chang,Qin Wang,Shijia Wu,Zhimiao Zhao,Yinjiang Zhang,Xian Lu,Yunhui Zhang
Phosphate-loaded pyrolyzed gypsum board was innovatively reused for Cd(Ⅱ)/Pb(Ⅱ) remediation. • Single and coexisting heavy metal systems were systematically evaluated in both aqueous and soil environments. • The recycled material achieved enhanced Cd(Ⅱ) adsorption while retaining high Pb(Ⅱ) removal capacity. • Phosphate-driven mineralization and ion exchange between hydroxyapatite and heavy metals enhance the immobilization. This study proposed a cascade utilization strategy for waste gypsum board by reusing phosphate-loaded pyrolyzed gypsum board (PGB150P) for Cd(Ⅱ) and Pb(Ⅱ) remediation in aqueous and soil environments. The results showed that PGB150 exhibited excellent Pb(Ⅱ) affinity (q max = 1396.14 mg/g) but limited Cd(Ⅱ) adsorption capacity (161.21 mg/g). PGB150P significantly enhanced Cd(Ⅱ) adsorption (403.84 mg/g) while retaining high Pb(Ⅱ) adsorption performance (1271.13 mg/g). In the Cd(Ⅱ)–Pb(Ⅱ) system, the adsorption capacities of Cd(Ⅱ) and Pb(Ⅱ) decreased to 170.17 and 980.05 mg/g, respectively, with Pb(Ⅱ) showing a stronger competitive advantage. Adsorption followed the Langmuir model and was spontaneous endothermic chemisorption controlled by film and intraparticle diffusion. PGB150P exhibited a broad pH adaptability and strong resistance to common coexisting ions. Mechanistic quantification revealed that Cd(Ⅱ) removal by PGB150P was dominated by precipitation (58.56%) and ion exchange (34.7%), while Pb(Ⅱ) removal was also dominated by precipitation (62.41%) and ion exchange (31.7%). Soil immobilization experiments showed that after 28 days treatment, PGB150P increased the residual fractions of Cd and Pb to 29% and 50%, respectively. In the Cd-Pb system, the residual fractions were increased to 15% and 49%, respectively. After five adsorption–desorption cycles, PGB150P retained about 71% of its Cd(Ⅱ) capacity and 93% of its Pb(Ⅱ) capacity. Cost analysis indicated a total cost of only 39–54 USD/t, substantially lower than that of adsorbents prepared with exogenous phosphate or commercial hydroxyapatite. This study provides theoretical support for the high-value utilization of construction solid waste and the remediation of multi-media heavy metal pollution. Download: Download high-res image (253KB) Download: Download full-size image
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