Materials Today Communications
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2025
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IF 4.5
Shengchao Yang,Jinpeng Qiao,Chao Kang,Mengyao Sun,Sheng Dong,Yuqian Zhao,Wenhao Sun,Yundong Yang,Chenlong Duan
Gallium is a strategic key metal, and its demand is increasing. Coal gangue is a kind of mine solid waste with huge reserves. Extracting gallium from coal gangue can realize high value-added utilization of solid waste. In this study, toluene-2,4-diisocyanate and polyether polyol were used to synthesize a new high-performance polyurethane foam adsorbent under triethanolamine catalytic. The feasibility of preparing polyurethane foams with different raw material ratios and the differences in their physicochemical properties were explored, and the optimal ratio of polyether polyol to toluene-2,4-diisocyanate was found to be 3.5. Adsorption tests of gallium ions in gangue acid leachate were carried out to determine the feasibility of adsorption of gallium by polyurethane foam in low gallium concentration solution, and the adsorption rate was 83.90% under the optimal conditions. The adsorption mechanism of polyurethane foam was revealed, indicating that Ga 3+ complexed with Cl - adsorbed on polyurethane groups (—COONH—), before adsorption need to use hydroxylamine hydrochloride to remove Fe 3+ in solution. The adsorption process can be described by pseudo-second-order kinetic model, conforms to Langmuir adsorption model, and belongs to the chemisorption. The reaction belongs to endothermic reaction. The foam still has good adsorption effect after multiple adsorptions, which opens up a new way for the recovery and utilization of gallium in coal gangue.
研究领域:
材料科学
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环境科学
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冶金工程
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 35
·84609-84619
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IF 5.8
Wu Zhaojiang,Lin Zheng,Wang Shengye,Yang Bo,Xiao Ke
The recovery of platinum from industrial waste is of critical importance. Usually, the recovery method is to dissolve the solid waste with acid to form a solution where platinum mainly exists in the form of Pt(IV). Therefore, it is urgent to efficiently and selectively adsorb Pt(IV) ions from acid leachates. In this study, a highly efficient adsorbent was developed by grafting of carboxyl and amine groups onto melamine sponge with alginate-Ca and polyethylenimine-glutaraldehyde (ML/ACPG). Combination of SEM, FTIR and XPS showed that the ML/ACPG sponge had a tree structure and the amino, carboxyl and hydroxyl groups were successfully introduced. Maximum adsorption capacity of ML/ACPG sponge reached up to 101.1 mg/L at pH of 1 (optimum initial pH value). The Pt(IV) ions were readily desorbed (within 60–80 min) using 0.1 M HCl + 0.025 M thiourea solution. Desorption efficiency remained higher than 83.3% while adsorption capacity decreased by less than 6.0% after 5 cycles operation. The ML/ACPG sponge was stable in 3 M of HNO 3 , NaCl after shaking for 72 h at 300 rpm with mass loss less than 2.5%. The mechanism of Pt(IV) adsorption onto ML/ACPG sponge mainly involved coordination by electrostatic attraction and carboxyl groups by protonated amine groups. The above results confirmed that the ML/ACPG sponge has a good practical application potential for Pt(IV) recovery from acid leachates.
研究领域:
材料科学
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环境工程
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DOI
PubMed
高影响因子
Journal of Cleaner Production
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2025
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IF 10
Shuyang Shi,Baozhong Ma,Hui Yang,Zhihe Cao,Yubo Liu,Yongqiang Chen,Chengyan Wang
In bauxite-scarce China, aluminum extraction from alternative resources via the acid leaching process is promising. However, critical gaps persist: (1) pyrolysis yields lightweight alumina with limited market capacity, and (2) direct electrolytic alumina synthesis from acid leach liquor remains unexplored, especially alumina particle size control. The production of coarse boehmite as an alumina precursor via high-temperature autohydrolysis was investigated in this paper. First, the hydrolysis characteristics of Al 3+ were revealed by thermodynamic analysis. Subsequently, the experimental parameters and hydrolysate particle size were optimized through a series of experiments. Under optimal conditions, an Al hydrolysis ratio of 82.6 % and a median particle size of 27.1 μm for polycrystalline boehmite were achieved. The morphological evolution of boehmite was revealed by SEM. The hydrolysis path was determined by analyzing the variation of Al-ion species with pH. Kinetics demonstrated that the hydrolysis process followed heterogeneous nucleation and was chemically controlled, with an apparent activation energy of 52.2 kJ/mol. Finally, a novel process for electrolytic Al 2 O 3 preparation and simultaneous HNO 3 regeneration using coal gangue and fly ash as raw materials was proposed. This study establishes a technological foundation for producing electrolytic alumina from aluminum-containing solid wastes, providing a novel route for large-scale aluminum resource recovery.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Peipei Gao,Wei Wang,Tao Tang,Rongge Hu,Mengyun Liu,Hanjie Wen,Ziyuan Zhou,Zhiqi Liu
The rapid expansion in the demand for LiFePO 4 (LFP) batteries has created a pressing need for recycling waste LFP batteries. However, the direct extraction of lithium from their acid leachate remains a significant challenge. This study developed a novel extraction system using tributyl phosphate (TBP) as extractant and ionic liquids (ILs) as co-extractant for selective recovery of Li + from H 2 SO 4 leachate of waste LFP cathode. The single-factor experiment results demonstrated that TBP-[C 4 mim][NTF 2 ] (1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide) exhibited higher lithium extraction efficiency under acidic conditions compared to TBP-[C 4 mim][PF 6 ] (1-Butyl-3-methylimidazolium hexafluorophosphate). Moreover, a four-stage cross-current extraction process utilizing the TBP-[C 4 mim][NTF 2 ] system was demonstrated to efficiently and selectively extract lithium from a real H 2 SO 4 leachate, achieving extraction efficiency and separation factor of 92.39% and 197.95, respectively. Mechanism insights from Fourier transform infrared spectroscopy (FT-IR) and theoretical calculations indicate that cationic exchange and a synergistic effect between TBP and IL enhance the selective extraction of lithium. The cation of IL (C 4 mim + ) enters aqueous phase, and Li + are extracted into organic phase in the form of Li + -TBP-[NTF 2 ] - with a larger binding energy. Furthermore, five cycles of extraction and stripping experiments not only yielded a lithium-enriched solution but also demonstrated the excellent stability of the TBP-[C 4 mim][NTF 2 ]. Finally, the Li + was ultimately recovered as high-purity Li 3 PO 4 via the chemical precipitation method. This study provides theoretical and technical references for efficient extraction of lithium from LFP acid leachate, which is crucial for comprehensive utilization of waste LFP cathodes.
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高影响因子
Journal of Cleaner Production
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2020
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IF 7.246
Wenkai Dong,Junjie Ding,Wenbo Wang,Li Zong,Jiang Xu,Aiqin Wang
Acid leaching of clay minerals provides a simple and industrially efficient route to produce active silica materials with different morphologies and functions on a large scale, but the generated acid leachate rich in metal ions has become a source of hazardous waste . Therefore, methods to treat or reuse it harmlessly become an emerging challenge. Here, a sustainable method to reuse the metal ions (i.e., Fe(II), Fe(III), Mg(II), and Al(III)) in the waste acid leachate of three representative clay minerals (palygorskite (Pal), montmorillonite (MMT) and nontronite (NNT)) for synthesizing 2D layered double hydroxide (LDH) was reported. The obtained Pal-LDH, MMT-LDH and NNT-LDH adsorbents can adsorb 127.16 ± 1.49 mg/g, 134.56 ± 3.49 mg/g and 123.20 ± 4.11 mg/g of Congo red (CR), respectively. The subsequent calcination treatment of LDH adsorbed CR produces three magnetic layered double oxides (LDO) with a 2D nano-layered shape and positive surface charges: Pal-LDO, MMT-LDO and NNT-LDO. The Pal-LDO adsorbent exhibits high adsorption capacities of 538.39 ± 4.23 mg/g for dye CR and 626.91 ± 4.89 mg/g for antibiotic tetracycline (TC). Using the adsorbent concentration of 0.50 g/L, the CR in the initial 100 mg/L dye solutions is removed completely. After adsorption, the adsorbent is easily recycled by exposing it to a magnetic field, regenerated by one-step calcination treatment and reused for the next adsorption cycle. After reuse 3 times, the resulting adsorbent still displays a good adsorption capacity of 350.67 ± 3.21 mg/g for the CR dye. Therefore, this study provides a new and universal approach to reuse the waste acid leachate of clay minerals and develop new recyclable adsorbents for the efficient decontamination of organic contaminants from wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
HYDROMETALLURGY
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2023
·
IF 4.7
Changye Mang,Guanghui Li,Yanhu Chen,Jun Luo,Mingjun Rao,Tao Jiang
Partial neutralization is typically used to remove Fe 3+ ions from the acid leach solution of laterite. However, during this process, significant amounts of Mg 2+ , Ni 2+ , Co 2+ , and SO 2– 4 are lost. With increasing initial Fe 3+ concentration and solution pH, the severity of loss increases, with the precipitation of Fe 3+ . In this study, the mechanisms of ion co-precipitation during partial neutralization were investigated. Based on density functional theory calculations, a precipitation pathway through the formation of [Fe 4 (OH − ) 2 (SO 2– 4) 4 ]•[2SO 2 – 4 •yH 2 O]•[M 2+ ] was proposed. The differential charge density diagram indicated that the O atoms acted as the charge acceptors and maintained the precipitate structure. The coordination between M 2+ and SO 2– 4 could be destroyed via intense agitation, releasing approximately 100% of Mg 2+ , Ni 2+ , and Co 2+ ions from the precipitates to the solution. Furthermore, the addition of cationic or anionic surfactants limited the formation of these coordination bonds. The highest retention percentages of Mg 2+ , Ni 2+ , and Co 2+ in solution were 99.4, 99.6, and 99.9%, respectively, after adding 2 × 10 −5 mol/L of sodium dodecylbenzenesulfonate (CTAB). In addition, a high temperature could break these coordination bonds. The retention percentages of Mg 2+ , Ni 2+ , and Co 2+ increased from 82.6, 85.2, and 86.5% to 99.9, 99.6, and 99.8%, respectively, as the temperature increased from 25 to 65 °C. These results confirmed the rationality of the proposed structure of the precipitate.
研究领域:
化学工程
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材料科学
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环境化学
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DOI
高影响因子
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