表面改性泡沫塑料对景观水体中氨氮的吸附特性
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摘要
采用化学氧化-明胶蛋白接枝法对聚氨酯泡沫塑料(PF)进行表面改性,并用于吸附景观水体中的低浓度氨氮,同时考察了溶液pH值、温度、时间等对吸附的影响。结果表明:作为低成本吸附剂,PF对氨氮具有较好的吸附能力,在平衡浓度为9 mg/L左右时,其吸附量是河砂(RS)的2.06倍。表面改性极大地提高了PF对氨氮的吸附能力,改性物(MPF)对氨氮的吸附能力是活性炭(GAC)的1.45倍,RS的4.56倍。MPF对氨氮的吸附以物理吸附为主,化学吸附极小,吸附速率由表面扩散吸附和颗粒内扩散吸附共同控制,且吸附过程是自发进行的,以熵推动为主;同时,溶液pH值条件对氨氮吸附的影响较小。
In this paper, a polyurethane foam(PF) was conducted surface modification by chemical oxidation-gelatin protein grafting, and was used for absorbing low-concentration ammonia nitrogen in landscape water, and meanwhile, the influence of solution pH value, temperature and time on adsorption was also studied. The results revealed that, PF as a low-cost absorbent performed well in adsorbing ammonia nitrogen, and when the equilibrium concentration was about 9 mg/L, its adsorption capacity of ammonia nitrogen was about 2.06 times of that by river sand(RS). The surface modification has greatly improved PF's adsorption capacity of ammonia nitrogen, and the adsorption capacity by MPF was about 1.45 times than that by activated carbon(GAC), and 4.56 times than that by RS. MPF adsorption of the ammonia nitrogen was mainly physical adsorption while chemical adsorption played only a small part. The adsorption rate was controlled both by the surface diffusion adsorption and the intra-particle diffusion adsorption, and the adsorption was proceeding spontaneously, mainly driven by entropy; in addition, pH value of aqueous solutions had little effect on adsorption of ammonia nitrogen.
In this paper, a polyurethane foam(PF) was conducted surface modification by chemical oxidation-gelatin protein grafting, and was used for absorbing low-concentration ammonia nitrogen in landscape water, and meanwhile, the influence of solution pH value, temperature and time on adsorption was also studied. The results revealed that, PF as a low-cost absorbent performed well in adsorbing ammonia nitrogen, and when the equilibrium concentration was about 9 mg/L, its adsorption capacity of ammonia nitrogen was about 2.06 times of that by river sand(RS). The surface modification has greatly improved PF's adsorption capacity of ammonia nitrogen, and the adsorption capacity by MPF was about 1.45 times than that by activated carbon(GAC), and 4.56 times than that by RS. MPF adsorption of the ammonia nitrogen was mainly physical adsorption while chemical adsorption played only a small part. The adsorption rate was controlled both by the surface diffusion adsorption and the intra-particle diffusion adsorption, and the adsorption was proceeding spontaneously, mainly driven by entropy; in addition, pH value of aqueous solutions had little effect on adsorption of ammonia nitrogen.
引文
[1] 孙智鑫.载β-FeOOH材料对氮磷吸附性能及景观水体应用研究[D].扬州:扬州大学,2013.
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[5] 李金辉,周涛,曾超,等.泡沫混凝土对模拟氨氮废水的吸附[J].环境工程学报, 2017, 11(8):4718-4724.
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[12] 吕长苓,王立本.软质聚氨酯泡沫塑料对高浓度苯酚的吸附特性[J].工业水处理, 2015, 35(2):71-74,78.
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[14] Jolley A G, Cohn G,Hitz G T, et al. Improving the ionic conductivity of nasicon through aliovalent cation substitution of Na3Zr2Si2PO12[J]. Ionics, 2015,21(11):3031-3038.
[15] Gerente C, Lee V R C, Le Cloirec P, et al. Application of chitosan for the removal of metals from wastewaters by adsorption mechanisms and models review[J].Critical Reviews in Environmental Science and Technology, 2007, 37(1): 41-127.
[16] Maszkowska J, Wagil M, Mioduszewska K, et al. Thermodynamic studies for adsorption of ionizable pharmaceuticals onto soil [J]. Chemosphere, 2014, 111: 568-574.
[17] 李忠,符瞰,夏启斌.改性天然沸石的制备及对氨氮的吸附[J].华南理工大学学报(自然科学版), 2007, 35 (4):6-10.
[2] Bandosz T J, Petit C. On the reactive adsorption of ammonia on activated carbons modified by impregnation with inorganic compounds[J]. Journal of Colloid and Interface Science, 2009, 338(2): 329-345.
[3] Aziz H A, Adlan M N, Zahari M S M, et al. Removal of ammoniacal nitrogen from municipal solid waste leachate by using activated carbon and limestone[J]. Waste Management & Research, 2004, 22(5): 371-375.
[4] 田琳,孔强,任宗明,等. 活性炭和沸石对氨氮的吸附特性及生物再生[J].环境工程学报, 2012, 6(10): 3424-3428.
[5] 李金辉,周涛,曾超,等.泡沫混凝土对模拟氨氮废水的吸附[J].环境工程学报, 2017, 11(8):4718-4724.
[6] 丁培菲,陈云嫩,张兴华,等. 改性后木屑的结构特性及其对氨氮的吸附性能[J].应用化工, 2017, 46(8):1526-1535.
[7] 张吉强,郑平.不同改性处理玉米秸秆对氨氮吸附性能研究[J].工业水处理, 2017, 37(6):78-81.
[8] 成国栋,王芬,李超,等.聚氨酯泡沫塑料填料的改性试验研究[J].中国给水排水, 2012, 28(3): 86-89.
[9] 成国栋.改性聚氨酯填料的生物膜附着性能及废水处理特性研究[D].天津:天津大学, 2011.
[10] 张勇.无机纳米材料改性聚氨酯泡沫塑料的制备及性能研究[D].武汉:华中科技大学, 2009.
[11] 李彦锋,赵光辉,马鹏程,等.改性载体固定化微生物处理高氨氮废水的研究[J].安徽农业科学, 2008, 36(7): 2877-2879,2890.
[12] 吕长苓,王立本.软质聚氨酯泡沫塑料对高浓度苯酚的吸附特性[J].工业水处理, 2015, 35(2):71-74,78.
[13] 董科.天然高分子化合物改性聚氨酯发泡材料的制备及染料吸附性能研究[D].镇江:江苏大学, 2013.
[14] Jolley A G, Cohn G,Hitz G T, et al. Improving the ionic conductivity of nasicon through aliovalent cation substitution of Na3Zr2Si2PO12[J]. Ionics, 2015,21(11):3031-3038.
[15] Gerente C, Lee V R C, Le Cloirec P, et al. Application of chitosan for the removal of metals from wastewaters by adsorption mechanisms and models review[J].Critical Reviews in Environmental Science and Technology, 2007, 37(1): 41-127.
[16] Maszkowska J, Wagil M, Mioduszewska K, et al. Thermodynamic studies for adsorption of ionizable pharmaceuticals onto soil [J]. Chemosphere, 2014, 111: 568-574.
[17] 李忠,符瞰,夏启斌.改性天然沸石的制备及对氨氮的吸附[J].华南理工大学学报(自然科学版), 2007, 35 (4):6-10.