Journal of Water Process Engineering
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2022
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IF 7.34
Xudong Zheng,Shangxiong Wang,Ang Li,Tongtong Xu,Jinfeng Mei,Zhongyu Li
Selective recovery of high value rare earth elements from tailings wastewater is an economical and environmental measure. In this study, we constructed highly elastic embossed bacterial cellulose aerogel (BCP-I) for highly selective adsorption of erbium ions using bio-based material (2,2,6,6-tetramethyl-1-piperidinyloxy-mediated bacterial cellulose) as a substrate material in concert with chitosan (CS) and polyethyleneimine (PEI). CS and PEI contain abundant functional monomers , which can cooperate with bacterial cellulose and Er(III) to construct more imprinting sites, which not only improves adsorption performance of BCP-I, but also makes aerogel more stable. In order to analyze physical and chemical properties of aerogels, it was characterized by scanning electron microscope , Fourier transform infrared spectrometer and thermogravimetric analysis . Adsorption experiments showed that BCP-I had a good adsorption effect on Er(III), and the maximum adsorption capacity could reach 95.99 mg g −1 . After five adsorption cycles, cycling experiments showed that adsorption performance of BCP-I was still in good condition. In conclusion, BCP-I is a good choice for the recovery of Er(III) because of its environmental friendliness, high selectivity and good reproducibility.
研究领域:
环境科学
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材料科学
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生物技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zhiqian Liu,Meng Rong,Yace Mi,Hui Cai,Liangrong Yang
Efficient extraction and recycling of rare earth elements (REEs) from low-concentration complex tailing wastewater is critical to meeting the growing industrial demands and optimizing resource utilization. In this work, three phosphorylated porous phenolic resins (PO-PPRs) were prepared via the phosphorylation of phenolic hydroxyl groups with POCl 3 , and employed to extract REE 3+ from both simulated and practical low-concentration REE 3+ -containing aqueous solution. The PO-PPRs, characterized by hierarchical pore structures, exhibit high adsorption capacities for both light and heavy REE 3+ ions over a broad pH working range from 3.0 to 7.0, along with fast adsorption kinetics (<30 min). And the maximum adsorption capacities of PO-PPRs for Nd 3+ , Dy 3+ and Y 3+ were found to be 104.1, 118.0 and 63.9 mg/g, respectively. Furthermore, the introduction of phosphonic groups significantly improves the REE 3+ adsorption selectivity against various interfering metal ions such as Na + , K + , Ca 2+ , Mg 2+ , and Al 3+ . For instance, the Nd 3+ /Al 3+ separation factor (S.F.) of 24 exceeded that of most commercial resins and reported materials. In a simulated mixed multi-element aqueous solution system containing Nd 3+ , Dy 3+ , Y 3+ , Al 3+ , Ca 2+ , Mg 2+ , Mn 2+ , K + and Na + , PO-PPR-1 extracted 82.5% of total REE 3+ while maintaining Al 3+ adsorption efficiency of less than 13%. Moreover, the extraction efficiency of total REE 3+ for PO-PPR-1 in pretreated practical wastewater from ion-adsorbed ores tailing reached 99.6%. Additionally, PO-PPRs demonstrated easy regeneration and excellent recycling performance after 5 consecutive adsorption–desorption cycles, confirming their promising application potential in low-concentration REEs extraction.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
WATER RESEARCH
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2025
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IF 12.4
Lan Lei,Rui Zhang,Rui-Xiang Bi,Zhi-Hai Peng,Xin Liu,Tie-Ying Shi,Li Zhang,Ru-Ping Liang,Jian-Ding Qiu
Efficient uranium capture from rare earth tailings wastewater holds great importance for human health and sustainable development. Herein, we present a simple and eco-friendly approach to form a single network hydrogel through electrostatic interaction between chitosan and sodium alginate. Subsequently, calcium phytate is introduced as a natural crosslinking agent to generate a secondary cross-linked network, leading to a composite hydrogel (CS-SA/PCa) with a doubly enhanced network structure for efficient adsorption of uranium from wastewater. The established multistage porous structure enables the rapid diffusion of uranyl ions, and the abundant phosphate groups serving as adsorption sites can offer high affinity for U(VI). Most importantly, CS-SA/PCa is formed through physical cross-linking of sustainable biopolymers, avoiding the use of toxic chemical agents. In addition, CS-SA/PCa exhibited significantly better mechanical properties than those of single-network physical hydrogels crosslinked by electrostatic interactions, which overcame the weak mechanical properties of physical hydrogels. It provides a new method for the manufacture of environmentally friendly, low-cost and robust physical hydrogels based on natural polymers.
研究领域:
环境科学
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材料科学
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生物工程
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2025
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IF 6.7
Xiang Gong,Suqi Li,Xiulan Guo,Jiaqiao Yuan,Hongyu Lu,Shuming Wen,Pan Yu,Shaojun Bai,Dandan Wu
This work investigates the efficiency removal and mechanism of xanthate from flotation tailings wastewater through a coagulation-Fenton oxidation process by introducing Fe 2+ and Mn 2+ to activate H 2 O 2 . Under the conditions of initial 60 mg/L SBX concentration, 50 mg/L H 2 O 2 concentration, 25 mg/L Fe 2+ concentration, 25 mg/L Mn 2+ concentration, 3.5 initial pH, and 60 min reaction time, the degradation rate of xanthate was more than 98 %. The H 2 O 2 + Fe 2+ +Mn 2+ system exhibits markedly superior degradation efficiency for SBX. The results demonstrate that the Fe 2+ +Mn 2+ bimetallic system in simulated AMD facilitates the activation of H 2 O 2 to generate a greater abundance of hydroxyl radicals (•OH). Through characterization of degradation products and analysis of intermediates, two potential degradation pathways of SBX are proposed. In the first pathway, SBX initially undergoes conversion to BPX, which subsequently degrades into small molecular compounds including CO 2 , H 2 O, and SO 4 2− under sustained •OH radical attack. The secondary pathway involves the formation of precipitates composed of xanthates metal (Fe/Mn), iron oxides, and manganese oxides. This work presents a new strategy for efficiently degrading xanthate contaminants in mineral flotation wastewater. It also valorizes AMD by exploiting its intrinsic properties, thereby mitigating AMD's environmental hazards at the source.
研究领域:
环境工程
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化学工程
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矿物加工
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废水处理
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高级氧化工艺
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Siqi Liang,Qiyu Meng,Zhiqian Liu,Hui Cai,Huizhou Liu,Meng Rong,Liangrong Yang
The separation and enrichment of rare earth elements (REEs) from tailing wastewater is of great significance for the sustainable supply of REEs and environmental remediation. As Al 3+ exhibits extreme similar properties with REE 3+ , selective recovery of REE 3+ from the sulphate tailing wastewater remains a considerable challenge. Based on the difference in the binding stability of REE 3+ and Al 3+ with sulfate ions, the utilization of sulfonic acid groups may provide a promising method for enhancing the selectivity of REE 3+ /Al 3+ in the sulphate aqueous solution. Herein, a series of sulfonic-acid-functionalized hyper-crosslinked polymers (SHCP-Ps) were successfully synthesized through a facile, scalable and one-step method catalyzed by chlorosulfonic acid, which has the advantages of high sulfonic acid density (3.27 mmol/g), specific surface area (1044.6 m 2 /g), abundant micropores and superhydrophilicity. These properties result in SHCP-P exhibiting fast adsorption kinetics (30 min) and high adsorption capacities (106.78 mg/g (La), 111.99 mg/g (Eu) and 126.27 mg/g (Lu)). Additionally, it exhibits extremely high REE 3+ /Al 3+ selectivity (SF(La/Al) = 6929, SF(Eu/Al) = 4810, SF(Lu/Al) = 3003) in sulfate medium, surpassing that of most existing REEs adsorbents. Upon application of SHCP-P to actual wastewater, the recovery rate of total REE 3+ was observed to reach 87 %, while the adsorption rate of Al 3+ was found to be 0. Simultaneously, SHCP-P exhibits both high reusability and magnification synthesis capabilities. The results indicate that SHCP-P has significant potential for industrial applications in the selective recovery of REEs from tailing wastewater.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
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