CN115367829B - 一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法 - Google Patents
一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法 Download PDFInfo
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Abstract
本发明提供了一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法,涉及水处理技术领域。包括以下主要步骤:(1)制备具有Janus结构的水凝胶,具体来说:以假酸浆多糖和聚乙烯醇作为水凝胶骨架,在上层添加光吸收剂聚多巴胺和光催化剂纳米TiO2,而在下层不添加任何辅材,从而将水凝胶分为蒸发层和传输层。(2)将步骤(1)制备的Janus结构复合水凝胶置于经预处理后的压裂返排液表面,在太阳能驱动下进行界面光蒸发过程进行水处理。(3)在返排液池现场建立玻璃房以收集蒸发水。本发明提供的方法可用于解决页岩气开发利用中压裂返排液的无害化绿色处理难题和用于其他一些小型水域的污水处理,表现出稳定的脱盐效能和优异的污水处理能力。
Description
技术领域
一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法
背景技术
页岩气是蕴藏于页岩层可供开采的天然气资源,经济价值巨大,资源前景广阔。我国将继续加大油气勘探开发,继续保持良好增长势头。我国页岩气开采普遍使用水力压裂技术,开采过程中不可避免会有大量的压裂液返排至地面,而压裂返排液具有高矿化度、高总溶解固体量(TDS)和高化学耗氧量(COD)等特点,若不妥善处理会对周边环境和生态系统造成极大危害。而其无害化处理是页岩气绿色开发中亟待解决的问题。而目前返排液的达标外排技术主要包括蒸汽压缩、离子交换和混凝沉淀,但这些技术均存在高耗能、高碳排放和高成本特点。
针对以上问题,本发明提出了一种基于Janus结构水凝胶的光驱动蒸发技术用于页岩气压裂返排液脱盐降污处理。首先,选用具有Janus结构的水凝胶作为核心材料,针对返排液而设计,兼具脱盐蒸发、催化降解功能。其次,该技术以绿色能源太阳能为驱动力,无需大型化工设备、无需集中建厂、无高额能耗费用,使得压裂返排液无害化绿色处理,页岩气开发中的节能减排成为可能。同时,本设计还可推广应用于小型水域的污水处理,具有一定的综合应用前景。
发明内容
本发明的目的是为了解决现有技术中的问题,提供一种Janus结构水凝胶用于压裂返排液脱盐降污处理。
为实现上述目的,本发明采用如下技术方案:
一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法:
采用制备的Janus结构复合水凝胶置于返排液池表面,下层接触返排液面,并在现场的返排液收集池建立玻璃房在太阳能驱动下进行界面光蒸发及光催化一体化过程进行压裂返排液的综合脱盐降污处理,并通过玻璃房收集蒸发水,其中包括:
在返排液现场建立简易的玻璃房,材质为石英玻璃,玻璃房上部倾角设置为108°;
一种Janus结构复合水凝胶的制备方法:具体包括:
(1)通过多巴胺与TiO2纳米颗粒在弱碱性范围内聚合制备聚多巴胺/TiO2悬浮液,按照比例将悬浮液与去离子水混合搅拌形成混合液;
(2)将假酸浆胶,聚乙烯醇溶于去离子水;
(3)将假酸浆胶,聚乙烯醇溶于步骤(1)中的混合液;
(4)将步骤(3)中得到的溶液加入交联剂戊二醛、盐酸后注模凝胶2小时后得到水凝胶上层;
(5)将步骤(2)中得到的溶液加入交联剂戊二醛、盐酸后注入步骤(4)制得的凝胶表面,凝胶2小时后得到Janus结构水凝胶;
将上述聚合得到的Janus复合水凝胶在去离子水中浸泡24h,进行液氮反复冻融10次,得到内部多孔的复合水凝胶。
进一步,聚多巴胺是由多巴胺在pH7.5-9.5之间聚合24-48h得到;
进一步,所述步骤(1)中加入的TiO2纳米颗粒与多巴胺质量比例为5:1;
进一步,所述步骤(2)、(3)中:聚乙烯醇和假酸浆胶的质量比范围为39:1-41:1。
与现有技术相比,本发明具有以下有益效果:
1)本发明选用了生物质材料假酸浆胶和聚乙烯醇作为水凝胶骨架,形成紧密的网络结构,假酸浆胶链与聚乙烯醇链相互缠结形成物理交联点,合成壁厚均匀的多孔双网络水凝胶。同时在上层添加光吸收剂聚多巴胺和光催化材料纳米TiO2,使其具有吸光与催化降解功能;而在下层不添加任何辅料,上下两层协同作用,形成Janus结构复合水凝胶;
2)现场玻璃房采用“斜屋顶式”设计可实现集光与集水为一体。采用石英玻璃,使太阳光能透过并集中于Janus水凝胶表面。顶部倾角设计为108°,可利于太阳光的折射与水蒸气冷凝收集。在蒸发过程中系统产生的水蒸气遇石英玻璃冷凝并沿“屋顶”流入收集槽内,得到达标外排水。
该技术成本低,无污染,对环境友好,有望在返排液绿色无害化处理的相关领域获得广泛的应用。
附图说明
图1是本发明以实施案例所采用的玻璃房的设计图及蒸发过程示意图;图2是本发明以实施案例2所制备的Janus结构复合水凝胶材料的上层(a)与下层(b)的扫描电镜图。
具体实施方式:
实施例一
将0.5g多巴胺和0.01g TiO2粉末溶解在0.275mol/L的Tris-HCl溶液中,用NaOH溶液调节pH至8.5。室温搅拌36h后形成悬浮液;将0.025g假酸浆胶粉45℃溶解在2.5mL悬浮液与7.5mL去离子水的混合液中。再加入0.975g聚乙烯醇75℃溶解;彻底溶解后加入125μL戊二醛超声混合均匀后,搅拌加入500μL盐酸溶液。将混合溶液注入制备得到的上层水凝胶,室温凝胶2h后,去离子水浸泡24h得到水凝胶。将水凝胶经液氮冷冻,30℃水浴解冻,反复冻融10次得到具有多孔结构的水凝胶。将水凝胶置于返排液表面,水凝胶与返排液接触,在太阳能驱动下进行界面光蒸发过程进行返排液的处理,并通过玻璃房收集蒸发水。
实施案例二
将0.025g假酸浆胶粉45℃溶解在10mL去离子水的混合液中。再加入0.975g聚乙烯醇75℃溶解;彻底溶解后加入125μL戊二醛超声混合均匀后,搅拌加入500μL盐酸溶液。将混合溶液注模密封,室温凝胶2h形成上层水凝胶;同时,将0.5g多巴胺和0.01g TiO2粉末溶解在0.275mol/L的Tris-HCl溶液中,用NaOH溶液调节pH至8.5。室温搅拌36h后形成悬浮液;将0.025g假酸浆胶粉45℃溶解在2.5mL悬浮液与7.5mL去离子水的混合液中。再加入0.975g聚乙烯醇75℃溶解;彻底溶解后加入125μL戊二醛超声混合均匀后,搅拌加入500μL盐酸溶液。将混合溶液注入制备得到的上层水凝胶,室温凝胶2h后,去离子水浸泡24h得到Janus结构复合水凝胶。将复合水凝胶经液氮冷冻,30℃水浴解冻,反复冻融10次得到具有多孔结构的Janus结构复合水凝胶。将水凝胶置于返排液表面,水凝胶与返排液接触,在太阳能驱动下进行界面光蒸发过程进行返排液的处理,并通过玻璃房收集蒸发水。
综上,对实施案例中的两种水凝胶进行表征与实验测试,可得实施例2为最佳方案,因此最佳为实施案例2。
上述实施案例仅为本发明的较佳实施例而已,故不能用于限定本发明实施的范围。即依本发明专利实施案例及说明书内容进行修饰或改变,皆应仍属于本发明涵盖的范围内。
Claims (5)
1.一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法,其特征在于采用制备的Janus结构复合水凝胶置于返排液池表面,并建立玻璃房,在太阳能驱动下进行界面光蒸发及光催化一体化过程进行压裂返排液的综合脱盐降污处理,并通过玻璃房收集蒸发水;所述Janus结构复合水凝胶的制备方法如下:
(1)通过多巴胺与TiO2纳米颗粒在弱碱性范围内聚合制备聚多巴胺/TiO2悬浮液,按照比例将悬浮液与去离子水混合搅拌形成混合液;
(2)将假酸浆胶,聚乙烯醇溶于去离子水;
(3)将假酸浆胶,聚乙烯醇溶于步骤(1)中的混合液;
(4)将步骤(3)中得到的溶液加入交联剂戊二醛、盐酸后注模凝胶2小时后得到水凝胶上层;
(5)将步骤(2)中得到的溶液加入交联剂戊二醛、盐酸后注入步骤(4)制得的凝胶表面,凝胶2小时后得到Janus结构水凝胶;
(6)将上述聚合得到的Janus复合水凝胶在去离子水中浸泡24h,进行液氮反复冻融10次,得到内部多孔的复合水凝胶。
2.根据权利要求1所述的一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法,其特征在于,玻璃房材质为石英玻璃,玻璃房上部倾角设置为108°。
3.根据权利要求1所述的一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法,其特征在于,所述步骤(1)中:聚多巴胺是由多巴胺在pH7.5-9.5之间聚合24-48h得到。
4.根据权利要求1所述的一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法,其特征在于,所述步骤(1)中:加入的TiO2纳米颗粒与多巴胺质量比例为5:1。
5.根据权利要求1所述的一种Janus结构水凝胶用于压裂返排液脱盐降污的处理方法,其特征在于,所述步骤(2)、(3)中:聚乙烯醇和假酸浆胶的质量比范围为39:1-41:1。
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