纳米HAP复合型材料吸附水中镍离子性能
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摘要
以石英砂作为载体,通过溶胶-凝胶法制备纳米羟基磷灰石复合型材料。通过投加量、初始pH、反应时间、粒径及初始浓度对复合型材料吸附镍离子性能的影响实验,结合扫描电镜对复合型材料做的表征分析,探讨复合型材料对镍离子的吸附特征与机理。实验结果表明,当投加量为5.2 g、溶液pH为7、反应时间为180 min、粒径为0.15～0.3 mm时,复合型材料对镍离子的去除效果较好且最大去除率为92.98%,最大吸附量达0.044 7 mg/g。复合型材料对镍离子的吸附符合准二级吸附动力学模型和Frenudlich等温吸附模型。SEM、EDS分析表明,复合型材料对镍离子的吸附作用主要为离子交换。
Nano-sized hydroxyapatite(HAP) composites were prepared by the solution-gel mixed with quartz.By studying a series of batch adsorption experiments about dosing amount,initial pH,reaction time,particle size and initial concentration,the adsorption capacity for Ni~(2+)on HAP composites was measured.The characteristics of adsorbent before and after adsorption were observed by scanning electron microscope.According to the experimental results,it showed that the maximum Ni~(2+)removal rate and the maximum adsorption capacity of nickel ion was respectively 92.98% and 0.044 7 mg/g when composite content was 5.2 g,the pH was 7,the reaction time was 180 min and the particle size was at 0.15～0.3 mm.Furthermore,the adsorption kinetics was best fitted by the pseudo-second order model,while the adsorption equilibrium was best described by Frenudlich isotherms.The analysis of SEM and EDS indicated that the adsorption mechanism may be controlled by ionexchange adsorption.
Nano-sized hydroxyapatite(HAP) composites were prepared by the solution-gel mixed with quartz.By studying a series of batch adsorption experiments about dosing amount,initial pH,reaction time,particle size and initial concentration,the adsorption capacity for Ni~(2+)on HAP composites was measured.The characteristics of adsorbent before and after adsorption were observed by scanning electron microscope.According to the experimental results,it showed that the maximum Ni~(2+)removal rate and the maximum adsorption capacity of nickel ion was respectively 92.98% and 0.044 7 mg/g when composite content was 5.2 g,the pH was 7,the reaction time was 180 min and the particle size was at 0.15～0.3 mm.Furthermore,the adsorption kinetics was best fitted by the pseudo-second order model,while the adsorption equilibrium was best described by Frenudlich isotherms.The analysis of SEM and EDS indicated that the adsorption mechanism may be controlled by ionexchange adsorption.
引文
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[14]谢超然,王兆炜,朱俊民,等.核桃青皮生物炭对重金属铅、铜的吸附特性研究[J].环境科学学报,2016,36(4):1190-1198.
[2] Sulaiman R N R,Othman N.Synergistic green extraction of nickel ions from electroplating waste via mixtures of chelating and organophosphorus carrier[J].Journal of Hazardous Materials,2017,340:77-84.
[3] Guo J L,Han Y C,Mao Y T,et al.Influence of alginate fixation on the adsorption capacity of hydroxyapatite nanocrystals to Cu2+ions[J].Colloids&Surfaces A:Physicochemical&Engineering Aspects,2017,529:801-807.
[4] Metwally S S,Ahmed I M,Rizk H E.Modification of hydroxyapatite for removal of cesium and strontium ions from aqueous solution[J].Journal of Alloys&Compounds,2017,709:438-444.
[5] Zhang Z Z,Li M Y,Chen W,et al.Immobilization of lead and cadmium from aqueous solution and contaminated sediment using nanohydroxyapatite[J].Environmental Pollution,2010,158(2):514-519
[6] Azouaou N,Sadaoui Z,Djaafri A,et al.Adsorption of cadmium from aqueous solution onto untreated coffee grounds:Equilibrium,kinetics and thermodynamics[J].Journal of Hazardous Materials,2010,184(1/2/3):126-134.
[7] Semerjian L.Equilibrium and kinetics of cadmium adsorption from aqueous solutions using untreated Pinus halepensis,sawdust[J].Journal of Hazardous Materials,2010,173(1):236-242.
[8]陈志良,蒋晓璐,周建民,等.重金属污染场地地下水污染特征与源解析研究——以广东某废弃电镀基地为例[J].中国农学通报,2014,30(20):202-207.
[9]商云涛,程志中,潘含江,等.红旗岭镍矿区水环境质量评价[J].环境与发展,2011,23(9):216-218.
[10]马海清,黄芳,崔龙哲,等.磁性沸石的制备及其对水溶液中镍的吸附[J].水处理技术,2016,42(4):65-68.
[11]任超,王洪涛,季峻峰,等.羟基磷灰石除氟的实验地球化学研究[J].高校地质学报,2016,22(2):289-298.
[12]梁美娜,王敦球,朱义年,等.羟基磷灰石/蔗渣炭复合吸附剂的制备及其对As(Ⅴ)的吸附机理[J].环境科学研究,2017,30(4):607-614.
[13]谭笑,朱宗强,曹爽,等.桉树遗态结构HAP/C复合材料对水中Cd2+的吸附性能[J].水处理技术,2017,43(9):38-42,46.
[14]谢超然,王兆炜,朱俊民,等.核桃青皮生物炭对重金属铅、铜的吸附特性研究[J].环境科学学报,2016,36(4):1190-1198.