Page 210 - 《精细化工》2020年第9期

·1924· 精细化工 FINE CHEMICALS 第 37 卷

溶液中主要的磷形态是H 3PO 4，H 3PO 4 与ES@Fe 3O 4-La Engineering Journal, 2015, 271: 204-213.
的结合较弱，吸附能力差 [40] 。2.13<pH<7.20 时，主 [5] LI Y Z, LIU C J, LUAN Z K, et al. Phosphate removal from aqueous
solutions using raw and activated red mud and fly ash[J]. Journal of
–
要的磷形态转化为 H 2 PO 4 ，ES@Fe 3 O 4 -La 表面通过 Hazardous Materials, 2006, 137(1): 374-383.
–
质子化带正电荷。因此，H 2 PO 4 被静电力吸附在 [6] YANG X F(杨徐烽).Discussion on the process of phosphorus
removal from wastewater [J].Energy Conservation & Environmental
ES@Fe 3 O 4 -La 上。当溶液 pH>7.20 时，ES@Fe 3 O 4 -La
Protection（节能与环保）,2020,(3):48-49.
去质子化，吸附剂表面带负电荷，主要的磷形态为 [7] SONG P P, YANG Z H, XU H Y, et al. Investigation of influencing
2–
HPO 4 。静电排斥对于磷酸盐吸附产生阻碍作用， factors and mechanism of antimony and arsenic removal by
electrocoagulation using Fe-Al electrodes[J]. Industrial & Engineering
–
且水中 OH 浓度逐渐增大，和磷酸盐阴离子竞争作 Chemistry Research, 2014, 53(33): 12911-12919.
用逐渐增强，吸附量有所降低。但是，碱性条件下 [8] HE W J (何雯菁), YANG S M (杨曙明), ZHANG G Y (张国友).
的 ES@Fe 3 O 4 -La 依然表现出较好的磷酸盐去除效 Recent studies on eggshell as adsorption material[J]. Transactions of
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果。原因可能是 ES@Fe 3 O 4 -La 表面覆盖了氢氧化镧 2016, 32(S2): 297-303.
活性层，对于磷酸盐的亲和作用充分补偿了静电排 [9] LAJTHA K, BLOOMER S H. Factors affecting phosphate sorption
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磷酸盐的主要作用 [36] ，因为路易斯酸碱作用是镧与 [10] KARAGEORGIOU K, PASCHALIS M, ANASTASSAKIS G N.
磷酸盐的特异性结合作用的化学基础。此外，镧与 Removal of phosphate species from solution by adsorption onto
calcite used as natural adsorbent[J]. Journal of Hazardous Materials,
磷酸盐之间还可能存在配体交换作用。同时，Ca 2+
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2–
与 HPO 4 在 ES@Fe 3 O 4 -La 表面生成 CaHPO 4 沉淀， [11] KAASIK A, VOHLA C, MOTLEP R, et al. Hydrated calcareous
可进一步增加除磷效率 [22] 。 oil-shale ash as potential filter media for phosphorus removal in
constructed wetlands[J].Water Research, 2008, 42(4/5): 1315-1323.
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ES@Fe 3 O 4 -La 的 X 射线荧光光谱、X 射线衍射、 [13] LAMMIE D, BAIN M M, WESS T J. Microfocus X-ray scattering
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傅里叶变换红外光谱和粒度分析结果表明：Fe 3 O 4
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和 La 均成功载入鸡蛋壳。 [14] YAN J J (闫久菊), WU L P (吴丽萍), WEN K J (文科军), et al.
与 ES 相比，ES@Fe 3 O 4 -La 能够明显提高对磷 Absorption performance of phosphorus on high-temperature modified
eggshell in wastewater[J]. Journal of Tianjin Chengjian University
酸盐的吸附，25 ℃下 ES@Fe 3 O 4 -La 对磷酸盐的 q max
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为 18.02 mg/g，而 ES 上的 q max 仅为 2.58 mg/g； [15] CHEN T (陈天). Study on the removal of phosphorus from waste
ES@Fe 3 O 4 -La 对磷酸盐的吸附是吸热过程，在 25~ water by modified egg shells[D]. Nanjing: Nanjing University of
Information Science and Technology (南京信息工程大学), 2011.
40 ℃内，温度升高有利于 ES@Fe 3 O 4 -La 对磷酸盐吸
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附的 自发进行； ES@Fe 3 O 4 -La 吸附等温 线符 合 sorbent for dynamic phosphate removal in slightly polluted water[J].
Langmuir 方程，为单分子层吸附；ES@Fe 3O 4-La 对磷 Journal of the Chinese Rare Earth Society (中国稀土学报), 2005,
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酸盐的吸附动力学过程遵循准二级反应动力学模型； [17] SI J (司静), LU S Y (卢少勇), JIN X C (金相灿), et al. Effect of pH
溶液初始 pH 显著影响 ES@Fe 3 O 4 -La 对磷酸盐的吸 value and light on La-modified bentonite adsorption of phosphorus
附效果，当 pH 为 4 左右时，ES@Fe 3 O 4 -La 对磷酸 and nitrogen in water[J]. China Environmental Science (中国环境科
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盐的吸附效果最佳。 [18] PHAM T, LEE K, KIM M S，et al. La-modified ZSM-5 zeolite beads
后期会采用实际废水进行研究来考察吸附剂实 for enhancement in removal and recovery of phosphate[J]. Microporous
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际应用情况，并对吸附机理进行进一步探究。
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