CN114735780A - 一种高效选择性吸附水溶液中Cr(VI)离子的高稳定DUT-52材料的应用 - Google Patents
一种高效选择性吸附水溶液中Cr(VI)离子的高稳定DUT-52材料的应用 Download PDFInfo
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Abstract
本发明公布了一种能够从水溶液中高效选择性吸附Cr(VI)离子的高稳定DUT‑52材料的应用。具体内容如下:(1)利用水热法制备了高稳定的DUT‑52材料,并使用XRD、TGA、SEM和XPS对其结构、稳定性和形貌进行表征。(2)设计了单因子实验、动力学实验、热力学实验、竞争离子实验和材料再生实验,系统研究其对水溶液中Cr(VI)离子的吸附过程。(3)基于氢键相互作用,其最大去除率为96.4%,最大吸附量为120.68mg·g‑1,且具有良好的选择性吸附和材料再生。本发明制备工艺简单,所制得的材料具有高的化学和热稳定性,重复性好,具有很强的可操作性和实用性,可以应用于废水中Cr(VI)离子的处理,具有潜在的应用前景。
Description
技术领域
本发明属于微纳米材料合成技术领域,具体涉及一种高效选择性吸附水溶液中Cr(VI)离子的高稳定DUT-52材料的应用。
背景技术
铬在自然界中主要以+3和+6两种价态存在,其中Cr(VI)离子具有较强的毒性、致突变性和致癌性,可以通过多种途径进入人体各个器官,对身体造成损伤,轻则会引发声音沙哑、鼻粘膜的萎缩,重则就会导致鼻中隔穿孔、肺气肿和肺硬化等病症。目前,Cr(VI)离子的去除方法主要有沉淀法、膜分离法、吸附法、离子交换法、生物处理法和化学氧化法等,以及这些方法的组合应用。上述几种方法有的工程技术难度高、潜在风险大、成本投入大,有的吸附容量低、选择能力弱等问题。吸附法由于具有操作容易、高效、吸附量大且部分吸附剂具有可循环再生等优点被广泛使用,然而活性炭、大孔树脂、天然沸石、分子筛和硅胶等大自然中存在的微孔吸附材料,由于其结构不规则且相对复杂,缺乏用于捕获废水中Cr(VI)离子的官能团或特征结构,并且没有足够大的孔道和纳米笼用于捕获与储存Cr(VI)离子。
近年来,一类由无机金属离子与有机配体构筑的金属有机框架(Metal organicframeworks,简称MOFs)功能材料,与传统的沸石、分子筛和活性炭相比,具有可调的框架结构、较高的孔隙率、超大的比表面积、良好的稳定性和合成过程简单等优点。从结构上讲,重金属离子进入MOFs材料的纳米孔道或者纳米笼中,会与活性位点发生相互作用,从而实现高效捕获与分离的功能。然而,在实际应用中将面临各种恶劣的环境,要求MOFs材料具有高的热稳定和化学稳定性。到目前为止,只有少量的MOFs材料能够同时具有高的热稳定性和化学稳定性,例如沸石咪唑框架结构(ZIFs)序列、MIL序列、卟啉类MOFs和锆基MOFs材料。
近年来,高稳定MOFs材料在捕获与分离Cr(VI)离子或重铬酸根等方面取得一些研究进展。例如,王瑞虎等利用中性的联三氮唑配体与AgClO4构筑了一例阳离子型多孔MOFs材料。该材料可通过阴离子交换,高容量、快速地捕获和分离水中的重铬酸根离子(Cr2O7 2-)。钱国栋等制备了一例阴离子锆基MOFs材料(ZJU-101),其比表面为561m2 g-1,比MOF-867的1862m2 g-1低了很多,然而该材料能够通过离子交换从水溶液中选择性吸附与分离Cr2O7 2-阴离子且最高吸附量为245mg/g。虽然高稳定MOFs材料在捕获与分离Cr(VI)离子或重铬酸根等方面已经取得一些进展,然而设计和制备高稳定的MOFs材料,并应用于高效的捕获与分离废水中Cr(VI)离子的还非常的少,依然是一项很具有挑战性的工作。
发明内容
本发明提供了一种高效选择性吸附水溶液中Cr(VI)离子的高稳定DUT-52材料的应用,其操作过程简单、重复性及可控性好。
为了达到上述发明目的,本发明看的具体技术方案如下:
(1)DUT-52材料的制备
将ZrCl4(1.03mmol,230mg)加入50mL聚四氟乙烯反应釜中,再加入20mL N,N’-二甲基甲酰胺(DMF),超声处理5min后,加入2,6-萘二甲酸(216mg,1mmol)超声处理5分钟。向混合溶液中加入3mL醋酸,混合物用超声处理15min,并置于烘箱(120℃)中加热24小时,冷却至室温。然后将所制备的样品离心,用新鲜DMF洗涤3次,用乙醇交换溶剂3次后,干燥并真空活化4h,得到白色粉末状的DUT-52材料。
(2)DUT-52材料在水溶液中吸附Cr(VI)离子的应用
称取一定量的DUT-52材料,加入到一定体积、一定浓度和一定pH的Cr(VI)离子的水溶液中,在不同温度下振荡不同的时间后,然后用0.45μm疏水聚四氟乙烯膜过滤后,测定Cr(VI)离子的残留浓度,计算其去除率和吸附量。
进一步地,所述步骤(1)中制备的DUT-52材料具有高的热稳定性和化学稳定性。
进一步地,所述步骤(2)中基于氢键相互作用,DUT-52材料对水溶液中Cr(VI)离子的最大去除率为96.4%,最大吸附量为120.68mg·g-1。
进一步地,所述步骤(2)中DUT-52材料能从抗衡离子种选择性吸附Cr(VI)离子且DUT-52材料具有良好的材料再生能力。
进一步地,所述步骤(2)中其吸附过程符合准二级动力学模型和Langmuir模型。
本发明公布了一种能够从水溶液中高效选择性吸附Cr(VI)离子的高稳定DUT-52材料的应用。具体操作如下:(1)利用水热法制备了高稳定的DUT-52材料,并使用XRD、TGA、SEM和XPS对其结构、稳定性和形貌进行表征。(2)设计了单因子实验、动力学实验、热力学实验、竞争离子实验和材料再生实验,系统研究其对水溶液中Cr(VI)离子的吸附过程。(3)基于氢键相互作用,其最大去除率为96.4%,最大吸附量为120.68mg·g-1,且具有良好的选择性吸附和材料再生。本发明制备工艺简单,所制得的材料具有高的化学和热稳定性,重复性好,具有很强的可操作性和实用性,可以应用于废水中Cr(VI)离子的处理,具有潜在的应用前景。
附图说明
图1DUT-52材料的粉末衍射图和晶体形貌图;
图2DUT-52材料的热重图;
图3DUT-52材料的晶体形貌图;
图4DUT-52材料的晶体结构图;
图5DUT-52材料的选择性吸附图和材料再生图;
图6DUT-52材料的最大吸附量和吸附机理图;
具体实施方式
下面通过实施例,结合附图进一步详细描述本发明,但本发明并不限于以下实施例。
本发明公布了一种高效选择性吸附水溶液中C(VI)离子的高稳定DUT-52材料的应用。
主要包括下述步骤:
(1)将ZrCl4(1.03mmol,230mg)加入50mL聚四氟乙烯反应釜中,再加入20mL N,N’-二甲基甲酰胺(DMF),超声处理5min后,加入2,6-萘二甲酸(216mg,1mmol)超声处理5分钟。向混合溶液中加入3mL醋酸,混合物用超声处理15min,并置于烘箱(120℃)中加热24小时,冷却至室温。然后将所制备的样品离心,用新鲜DMF洗涤3次,用乙醇交换溶剂3次后,干燥并真空活化4h,得到白色粉末状的DUT-52材料。
(2)称取一定量的DUT-52材料,加入到一定体积、一定浓度和一定pH的Cr(VI)离子的水溶液中,在不同温度下振荡不同的时间后,然后用0.45μm疏水聚四氟乙烯膜过滤后,测定Cr(VI)离子的残留浓度,计算其去除率和吸附量。
(3)DUT-52材料在水溶液中吸附Cr(VI)离子的最佳吸附条件为:DUT-52材料的用量为35mg,初始浓度为25μg/mL,吸附温度为35℃和溶液pH为3.02,此时Cr(VI)离子的最大去除率为96.4%。
(4)在竞争离子(NO3 -,CO3 2-,SO4 2-,PO4 3-,Cl-和AC-)的存在下,DUT-52材料可以高效吸附Cr(VI)离子。此外,DUT-52材料吸附Cr(VI)离子后,可以通过甲醇和醋酸对材料进行再生处理,处理后的材料循环吸附5次后,去除率还能达到80.3%。
(5)当吸附平衡浓度为300μg·mL-1,DUT-52材料对Cr(VI)离子的最大吸附量为120.68mg·g-1。通过对动力学和热力学数据进行分析,结果表明DUT-52材料对Cr(VI)离子的吸附过程符合准二级动力学模型和Langmuir模型,该过程是自发过程和放热过程。
(6)DUT-52材料吸附Cr(VI)离子的机理可能是重铬酸根的O原子与萘二甲酸配体的H原子之间存在氢键相互作用。
Claims (5)
1.一种高效吸附水溶液中Cr(VI)离子的高稳定的DUT-52材料的应用,主要包括下列步骤:
称取一定量的DUT-52材料,加入到一定体积、一定浓度和一定pH的Cr(VI)离子的水溶液中,在不同温度下振荡不同的时间后,然后用0.45μm疏水聚四氟乙烯膜过滤后,测定Cr(VI)离子的残留浓度,计算其去除率和吸附量。
2.根据权利要求1所述的应用,其特征是:DUT-52材料具有高的热稳定性和化学稳定性。
3.根据权利要求1所述的应用,其特征是:基于氢键相互作用,DUT-52材料对水溶液中Cr(VI)离子的最大去除率为96.4%,最大吸附量为120.68mg·g-1。
4.根据权利要求1所述的应用,其特征是:DUT-52材料能从抗衡离子种选择性吸附Cr(VI)离子且DUT-52材料具有良好的材料再生能力。
5.根据权利要求1所述的应用,其特征是:其吸附过程符合准二级动力学模型和Langmuir模型。
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