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Water Research |南昌大学谢显传团队:原位“以废治废”!稀土尾矿合合成电极,实现矿废水中NH4+高效去除与回收

  • 2026-04-22 20:37:13
Water Research |南昌大学谢显传团队:原位“以废治废”!稀土尾矿合合成电极,实现矿废水中NH4+高效去除与回收

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▲ 第一作者:Wenrong Xiong Yalan Zhang

通讯作者:Xianchuan Xie

通讯单位: 南昌大学

全文速览

稀土开采冶炼产生的尾矿和高氨氮废水带来严重环境问题,本研究以稀土尾矿(RET)为原料合成导电沸石,将其作为流动电极应用于流动电极电容去离子(FCDI)技术,实现矿废水中NH4+高效去除与回收。优化后的 FCDI 系统在 1.2 V、19.2 mL/min 流速、pH 4 条件下,对模拟废水NH4+去除率达 97.22%,吸附容量 195.45 mg/g;实际矿废水中NH4+去除率 90.49%,且负载氨的导电沸石重金属含量远低于国标,可作为缓释肥,1% 添加量使玉米株高提升近 3 倍、根长提升超 2 倍。该技术构建了尾矿利用 - 废水修复 - 农业应用的 “以废治废” 循环经济模式,为矿业绿色发展提供新路径

研究背景

稀土是现代工业关键原料,但其提取每年产生 50-70 亿吨尾矿,且铵盐萃取剂的使用导致矿废水含高浓度NH4+(如江西赣州稀土尾矿渗滤液NH4+达 3500-4000 mg/L)。尾矿堆积易造成重金属渗漏、地下水污染,高浓度NH4+则引发水体富营养化,威胁生态与饮用水安全,开发经济高效的尾矿与矿废水处理技术迫在眉睫。
流动电极电容去离子(FCDI)是先进的电化学离子分离技术,具有离子分离效率高、操作简单、能耗低等优势,已被用于氨氮回收,但现有电极材料(活性炭、聚苯胺基介孔碳等)存在性能瓶颈,且未实现与稀土尾矿资源化的结合。沸石因多孔结构具有优异的NH4+离子交换能力,但导电性差限制了其在 FCDI 中的直接应用;而稀土尾矿富含SiO2和Al2O3,是合成沸石的理想前驱体。基于此,本研究从稀土尾矿合成导电沸石,兼具尾矿资源化与 FCDI 电极性能提升的双重价值,目前尚未有相关研究报道。

本文要点

本研究以稀土尾矿为原料,通过高温煅烧 - 水热法合成铝掺杂导电沸石(Al0.1/Al0.3/Al0.5),系统探究铝粉添加量对沸石理化与电化学性能的调控机制,筛选出最优性能的Al0.3导电沸石;优化 FCDI 系统操作参数,揭示导电沸石基 FCDI 去除回收NH4+的扩散 - 电泳 - 电吸附协同机制;通过实际稀土矿废水中试和玉米盆栽试验,验证技术的实际可行性与负载氨导电沸石的缓释肥应用潜力,首次构建了稀土矿业 “尾矿 - 废水 - 农业” 的闭环资源利用体系。

图片解析

材料合成与形貌表征核心信息

(1)1a:清晰展示导电沸石的合成流程 —— 稀土尾矿经研磨后与 NaOH1:1 混合,700℃煅烧 90 min,添加不同量铝粉调 Si/Al 比,80℃水热反应 12 h,洗涤干燥后得到导电沸石,工艺简单且原料为固废,符合资源化理念。
(2)1b-1e:对比显示稀土尾矿为不规则团聚形貌,而Al0.3导电沸石形成规则多面体结晶结构(典型的 A 型沸石特征),且 O、Si、Na、Al 元素分布均匀,证明以尾矿为原料成功合成结晶态导电沸石
材料性能调控机制核心信息
(1)3a-3b:XRD 显示添加 0.3 g 铝粉时 A 型导电沸石结晶度最高,铝粉过少生成方钠石、过多则降低结晶度;FT-IR 检测到 T-O-T 伸缩振动、四面体双环结构特征峰,证实沸石晶体骨架形成,Ca2+交换后Al0.3沸石比表面积从 14.3 m2/g 提升至 270.10 m2/g,微孔占比超 76%,大幅提升离子传输能力。
(2)3c-3f:XPS 表明Al0.3沸石的 M-OH 含量实现材料亲水性与表面活性位点利用率的平衡,Na 1s 和 Al 2p 结合能偏移证明铝粉诱导电子结构重构;CV 和 EIS 显示Al0.3沸石比电容最高(2.32 F/g)、电阻最低;电导率测试中Al0.3沸石达 1137 μS/cm,为最优 FCDI 电极材料,证实铝粉添加量为 0.3 g 是调控沸石电化学性能的最佳条件。

FCDI 系统参数优化核心信息

(1)4a-4e:系统探究了操作电压、流速、初始NH4+浓度、pH 对 FCDI 性能的影响,确定最优参数为 1.2 V(避免水电解)、19.2 mL/min(兼顾去除效率与能耗)、pH 4(沸石呈适度负 zeta 电位,增强NH4+静电吸附,且无NH3气态流失);初始浓度 200 mg N/L 时,去除率达 97.22%,吸附容量 195.45 mg/g,远优于传统电极材料。
(2)4f:12 h 六次吸附 - 解吸循环后,NH4+去除率仍保持 90% 以上,证明稀土尾矿基导电沸石具有优异的再生性能和长期使用稳定性,为实际工程应用奠定基础
NH4+去除回收机制与实际废水验证
(1)5a-5b:首次明确 FCDI 去除NH4+的协同机制 —— 电迁移(61.4%)为主要贡献,电吸附(43.3%)和扩散(18.2%)为辅,外部电压与导电沸石的高吸附容量共同推动NH4+从废水向电极迁移,且沸石吸附降低电极液中NH4+浓度,避免反向扩散。
(2)5c:实际稀土矿废水处理中,2 h 内NH4+去除率达 90.49%,其中 79.52% 的NH4+被导电沸石直接吸附储存,仅 20.48% 存在于电极液相,证明该技术对实际矿废水的高效氨氮回收能力,且回收的氨主要富集于沸石中,为后续制备缓释肥提供基础。
实际污染物去除与缓释肥应用核心信息
(1)6a:FCDI 系统对实际废水中K+、Ca2+、Mg2+去除率分别为 84.82%、63.71%、77.33%,Al3+、PO43−去除率近 100%;Ca2+、Mg2+为植物必需中量元素,其同步吸附进一步提升了沸石的肥效价值。
(2)6b-6c:盆栽试验表明,导电沸石添加量为 1% 时效果最佳,玉米株高达 26.4 ± 0.4 cm(对照组仅 8.9 ± 2.7 cm,提升近 3 倍),鲜重也显著高于其他组;添加量 2% 时因降低土壤孔隙度抑制生长,确定了最优施肥比例;且沸石重金属含量符合《肥料中有毒有害物质的限量》(GB 38400-2019),证明其作为低重金属缓释肥的环境安全性与应用潜力。

结论

本研究首次以稀土尾矿为原料,通过高温煅烧 - 水热法成功合成铝掺杂导电沸石,其中Al0.3导电沸石因优化的晶体结构、电化学性能和孔结构,成为 FCDI 最优电极材料;优化后的 FCDI 系统在 1.2 V、19.2 mL/min、pH 4 条件下,对模拟矿废水NH4+去除率 97.22%、吸附容量 195.45 mg/g,性能显著优于活性炭、聚苯胺基介孔碳等传统电极。

意义和展望

本研究的核心意义在于突破了传统 FCDI 电极材料性能瓶颈与稀土尾矿资源化的技术壁垒,首次实现了稀土矿业固废 - 废水的协同治理与高值化利用,为解决矿业环境问题提供了全新的闭环思路,兼具环境、经济和农业价值

文献信息

Rare earth-derived conductive zeolite electrodes empower NH4+ recovery from mining wastewater via FCDI and their application as ammonia release fertilizer. AWater Research. 2026

DOI: https://doi.org/10.1016/j.watres.2026.125581

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  1. CONNECT:[ UseTime:0.000728s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000826s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000282s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000657s ]
  6. SELECT * FROM `set` [ RunTime:0.000250s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000582s ]
  8. SELECT * FROM `article` WHERE `id` = 475638 LIMIT 1 [ RunTime:0.001129s ]
  9. UPDATE `article` SET `lasttime` = 1777106901 WHERE `id` = 475638 [ RunTime:0.002306s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.008154s ]
  11. SELECT * FROM `article` WHERE `id` < 475638 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000624s ]
  12. SELECT * FROM `article` WHERE `id` > 475638 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000497s ]
  13. SELECT * FROM `article` WHERE `id` < 475638 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001661s ]
  14. SELECT * FROM `article` WHERE `id` < 475638 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008587s ]
  15. SELECT * FROM `article` WHERE `id` < 475638 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004280s ]
0.192739s