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壳聚糖对重金属离子吸附的研究 总被引:13,自引:0,他引:13
研究了壳聚糖对溶液中重金属离子:Zn^2+,Ag^+,Pb^2+,Cd^2+,C^2+的吸附行为。测定和计算了不同条件下壳聚糖对重金属离子的吸附量,讨论了不同条件下壳聚糖对重金属离子的吸附情况,实验结果表明,壳聚糖能较好的吸附溶液中重金属离子。 相似文献
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针对当前饮用水水源重金属检测精度问题,提出一种复合吸附剂的制备。实验首先对制备的复合吸附剂环保性能进行测试,然后对吸附条件进行优化,最后在优化条件下,研究了复合吸附剂的吸附性能。实验结果表明,投加0.5g·L-1的吸附剂处理的废水初始浓度为4μg·L-1,吸附420min后,吸附剂Mn溶出量约为12.5μg·L-1,对重金属去除率约为95%,体系内残余重金属离子始终低于0.5μg·L-1,满足国标GB 5749-2022对饮用水中重金属含量的要求;以NaClO为再生剂处理的复合吸附剂,经过3次循环后,对重金属的去除率仍超过98%,表现出良好的吸附性能和再生性能。 相似文献
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何博 《中国石油和化工标准与质量》2013,(19):37-38
每年冶炼、纺织印染、纸等行业都会大量排放含铬等多种重金属离子的工业废水,在鱼类和其他水生物体内富集,造成环境污染。本文通过聚乙二醇类聚合物吸附剂,针对水溶液中铬进行实验研究,证明该物质对铬的的吸附能力,并提出相关建议。 相似文献
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This article discusses the preparation of the water‐insoluble adsorbent sulfhydryl chitin (s‐chitin), by treatment of the chitin with sulfhydryl acetic acid in the presence of sulfuric acid as a catalyst. Its structure was confirmed by elemental analysis, FTIR spectra analysis and near‐IR spectra analysis. We also investigated the adsorption properties of sulfhydryl chitin for CuII, CdII, PbII, CrIII, and NiII. Based on the research results of adsorption capacity, the effect of pH value on adsorption, adsorption kinetics experiments, and selective adsorption experiments were observed. It has been shown that the s‐chitin has much better adsorption for PbII, CuII, and CdII than chitin itself. The adsorption capacities of s‐chitin for PbII, CuII, and CdII were 108.3, 94.7, and 57.1 mg/g, respectively. It also had good adsorption properties for heavy metal ions. The adsorption capacities were also affected by the acidity of medium. The adsorbed CuII, CdII, and PbII could be eluted by diluted chlorhydric acid. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 151–155, 2000 相似文献
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研究了活性炭分别对铅、镉、铜及锌离子的吸附作用,研究了pH值、温度及活性炭的投加量等因素对吸附效果的影响。结果表明,当pH〉5时对四种离子的去除率均达到98%以上,能达到很好的吸附。低温有利于吸附的进行。随着活性炭的增加.重金属离子的去除率增加.而且铜离子的活性炭最佳用量是0.3000g.铅、镉和锌的活性炭最佳用量均为1.000g。随着吸附时间的增加,去除率上升。铜、铅、镉和锌离子的吸附平衡时间分别为3.5h、1h、1.5h和1.5h。铜离子的吸附符合Langmuir等温模式,而锌、铅和镉离子的吸附符合Freundlich等温模式。 相似文献
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重金属是对生态环境危害极大的一类污染物。去除废水中的重金属元素,生物膜法是一种有效的净化工艺。为了寻找生物膜去除重金属离子的最优操作条件,考察了各种影响因素pH值、温度、吸附时间、生物膜量、共存离子对吸附的影响。从实验结果可知,Cu2+的最优操作条件是pH值为6,温度在30℃左右,吸附时间为15min,生物膜量为12g,吸附率可达到65%;Cr3+的最优操作条件是pH值为3~7,温度在25℃左右,吸附时间为5min,生物膜量为10g,吸附率可达到87%。共存离子的竞争吸附会对吸附能力弱的Cu2+产生很大的影响,Cr3+没有表现出受到抑制或促进作用的影响,对单一Cu2+或Cr3+吸附体系,可以用经典的吸附模型进行拟合。 相似文献
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Dejian Liu Congcong Ding Fangting Chi Ning Pan Jun Wen Jie Xiong Sheng Hu 《应用聚合物科学杂志》2019,136(43):48156
The pollution of heavy metal ions in water poses a serious threat to human being and ecosystems. Here, we report polyamidoxime (PAO) brush grafted graphene oxide (GO) as a highly efficient adsorbent for extraction of toxic metal cations from water. Surface-initiated atom transfer radical polymerization was used to grow polyacrylonitrile (PAN) brushes on GO, followed by conversion of the nitrile groups in PAN into amidoxime groups, which had high binding affinity toward heavy metal cations. The PAO brush grafted GO demonstrated significantly fast adsorption kinetics and large adsorption capacity. At optimal pH 5, the PAO brush grafted GO can achieve maximum adsorption capacities of 116.7 mg g−1 for Pb(II), 258.6 mg g−1 for Ag(I), 192.2 mg g−1 for Cu(II), and 167.9 mg g−1 for Fe(III), which were significantly larger than those of small molecule functionalized GO. Mechanism analysis suggested that the enhanced adsorption performance was due to the myriads of functional groups in PAO brushes that were easily accessible to metal ions because of the swelling of the polymer brushes in water. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48156. 相似文献
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Amidinothiourea-linked covalent organic framework for the adsorption of heavy metal ions 总被引:1,自引:0,他引:1
Heping Wang Bang Feng Qianwen Zhang Qiang Du Qiuhong Bai Cong Li Yehua Shen 《Polymer International》2022,71(1):38-46
For the first time, a novel amidinothiourea-linked covalent organic framework (COF) (TpAt) has been successfully synthesized by the condensation between 1,3,5-triformylphloroglucinol and amidinothiourea via vacuum solvothermal reaction, and was further utilized for the adsorption of metal ions from aqueous solution. The effects of initial concentration, pH and contact time on the adsorption process were investigated. As a result, the TpAt COF showed maximum binding capacities as high as 95.44, 100.76 and 99.08 mg g–1 for Cr(III), Cd(II) and Cu(II) within 180 min at the initial concentration of 100 mg L–1, respectively. The isotherms of metal ions onto TpAt could be described by the Freundlich isotherm equation, and the adsorption kinetics followed the pseudo-second-order model. The TpAt could be reused for more than five adsorption–elution cycles, whilst basically maintaining its original adsorption performance and the structural integrity of the COF layers. The robust adsorption efficiency can be attributed to the coordination between metal ions and N, O and S atoms in the TpAt framework. The TpAt COF represents an ideal candidate for the removal of heavy metal ions in environmental pollution treatment. © 2021 Society of Industrial Chemistry. 相似文献
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风化煤对水中重金属离子的吸附 总被引:3,自引:0,他引:3
以甘肃景泰风化煤作吸附剂,常温下对水溶液Pb^2+、Cu^2+、Zn^2+进行了吸附实验研究,探讨了吸附动力学、吸附平衡、介质酸度的影响及吸附机理。结果表明,风化煤对几种重金属离子的吸附具有pseudo-second-order Lagergren模型的特征,吸附平衡基本符合Langmuir模型,介质酸度对吸附效果有显著的影响,pH大于5时吸附率均可接近90%。 相似文献
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重金属离子污染具有非降解性、持续存在和累积的性质,影响着人类的生命安全。如何从水中去除重金属离子已经成为治理水污染的核心问题之一,其方法之一就是采用改性蒙脱土进行吸附处理。本文介绍了近年来重金属离子吸附用改性蒙脱土的研究新进展,重点回顾了无机改性蒙脱土、有机改性蒙脱土和无机有机复合改性蒙脱土的改性方法及其对重金属离子的去除能力及机理。提出今后改性蒙脱土研究的主要方向是合成多功能高吸附性的蒙脱土高分子复合微球、蒙脱土高分子凝胶和滤膜材料等,为今后改性蒙脱土作为重金属离子优良吸附剂的研究有一定的指导意义。 相似文献
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离子印迹聚合物吸附材料对模板离子具有强识别能力,对其可实现高选择吸附,因而离子印迹技术常用于制备高选择性吸附材料。但传统方法制备的离子印迹吸附材料,因识别位点容易被包埋导致其吸附容量小、吸附-脱附速率低,而表面离子印迹技术则是采用模板离子和聚合单体直接在载体表面或附近区域构筑选择性识别位点,所有活性位点均暴露,从而有效地解决了上述问题。本文从技术原理与合成原料、制备工艺方法以及载体材料类型等方面对表面印迹聚合物吸附材料近期研究进展情况进行了概述。针对相关研究现状,从载体材料、功能单体、目标离子等角度分析和讨论了表面离子印迹聚合物吸附材料当前发展中的不足及其所面临的挑战,并对表面离子印迹技术发展趋势和前景进行了展望。 相似文献
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微凝胶聚合物网络中易于引入能够与重金属离子螯合或络合的功能基团,且比表面积大,对重金属离子具有较快的吸附速率,因此,微凝胶在重金属离子的去除方面具有广阔的应用前景。本文介绍了重金属离子吸附用微凝胶研究新进展,重点回顾了基于羧基、氨基、磺酸基、羟基及巯基等多官能团化合物与重金属离子通过静电相互作用形成稳定络合物的微凝胶用于重金属离子的吸附,离子印迹型微凝胶用于重金属离子的吸附,以及基于冠醚环(苯并-18-冠-6醚)与Pb2+离子通过超分子主-客体识别作用形成稳定络合物的微凝胶用于重金属离子的吸附;描述了这三类微凝胶对重金属离子的吸附性能、优点、用途等;指出了这三类微凝胶适用于不同场合下重金属离子的吸附。 相似文献