技术领域technical field
本发明涉及水溶性有机物的处理，特别涉及一种光活海泡石Si-OH用于水溶性有机污染物吸附与光降解的方法。The invention relates to the treatment of water-soluble organic matter, in particular to a method for the adsorption and photodegradation of water-soluble organic pollutants by photoactive sepiolite Si-OH.
背景技术Background technique
海泡石等粘土矿物资源的开发是国家经济发展的重大需求，也是湖南、江西和河北等地方省份经济和社会发展的重要支撑。近年来，基于比表面积和表面活性方面的突出优势，海泡石已经广泛地运用于土壤治理、空气净化和水体吸附等领域。土壤治理方面，海泡石对砷、镉和铅等重金属具有吸附和螯合作用，通过复配其他功能添加剂，使其相互作用形成的固化网，进一步将重金属封闭在晶格网中，从而实现砷、镉和铅等重金属的固化稳定化。空气净化方面，海泡石和改性后的海泡石不仅能高效滤除VOCs、SO2或H2S、NOx等有害气体，同时具备强大持久的抗菌功能，对PM2.5的一次过滤效率能够高达99%。水体吸附方面，海泡石由于具有极强的吸附性能和离子交换性能，主要运用于水体中重金属Cd和Pb的吸附和去除，然而随着水体中染料、抗生素、有机农药、微塑料等痕量有机污染物的出现，海泡石在有机物污染物的去除领域也出现了相关的科学研究。然而海泡石在土壤重金属污染治理、空气净化和污水处理等领域的应用往往局限于其较大的比表面积和较高的表面活性，而对其Si-OH基的光化学反应活性则尚未开发利用。特别是在有机污染物控制领域，吸附在海泡石表面的有机污染物不能有效地进行矿化降解则大大限制了其应用范围。海泡石Si-OH基在外在光源的作用下能发生Si-O键均裂而产生具有高氧化还原电位的•OH等活性氧物种，并进一步导致有机污染物矿化降解。The development of clay mineral resources such as sepiolite is a major demand for national economic development, and it is also an important support for the economic and social development of local provinces such as Hunan, Jiangxi and Hebei. In recent years, based on its outstanding advantages in specific surface area and surface activity, sepiolite has been widely used in fields such as soil treatment, air purification and water adsorption. In terms of soil treatment, sepiolite has adsorption and chelation effects on heavy metals such as arsenic, cadmium, and lead. By compounding other functional additives, the solidified network formed by their interaction can further seal heavy metals in the lattice network, thereby achieving Curing stabilization of heavy metals such as arsenic, cadmium and lead. In terms of air purification, sepiolite and modified sepiolite can not only efficiently filter out harmful gases such as VOCs, SO2 or H2 S, NOx, but also have a strong and durable antibacterial function, and the primary filtration efficiency of PM2.5 can reach Up to 99%. In terms of water adsorption, sepiolite is mainly used for the adsorption and removal of heavy metals Cd and Pb in water due to its strong adsorption and ion exchange properties. With the emergence of organic pollutants, sepiolite has also undergone related scientific research in the field of removal of organic pollutants. However, the application of sepiolite in the fields of soil heavy metal pollution control, air purification and sewage treatment is often limited to its large specific surface area and high surface activity, while the photochemical reactivity of its Si-OH group has not been developed yet. . Especially in the field of organic pollutant control, the organic pollutants adsorbed on the surface of sepiolite cannot be effectively mineralized and degraded, which greatly limits its application range. The Si-OH group of sepiolite can undergo Si-O bond homolysis under the action of external light source to generate active oxygen species such as •OH with high redox potential, and further lead to the mineralization and degradation of organic pollutants.
因此，如何有效地激活海泡石Si-OH基产生•OH等活性氧物种并运用于有机污染物控制领域是整合海泡石矿产资源和拓宽其应用范围的主要技术瓶颈点，也是促使基础研究成果走向应用必须解决的核心科学问题。Therefore, how to effectively activate the Si-OH group of sepiolite to generate active oxygen species such as OH and apply it to the field of organic pollutant control is the main technical bottleneck point for integrating sepiolite mineral resources and broadening its application range, and it is also the key point for basic research. The core scientific problems that must be solved for the results to be applied.
发明内容Contents of the invention
本发明是针对现有技术的不足，提供一种光活海泡石Si-OH用于水溶性有机污染物吸附与光降解的方法，在100-800 nm光源作用下固/液界面吸附和固/气界面光催化下降解水溶液中有机污染物，即采用100-800 nm光源照射在海泡石内腔和表面达到吸附脱附平衡的海泡石，海泡石被光源激活发生Si-OH健断裂并形成羟基自由基等活性氧物种，从而达到氧化降解抗生素的目的。The present invention aims at the deficiencies of the prior art, and provides a method for photoactive sepiolite Si-OH to be used for adsorption and photodegradation of water-soluble organic pollutants. Under the action of a 100-800 nm light source, solid/liquid interface adsorption and / Air interface degrades organic pollutants in aqueous solution under photocatalysis, that is, 100-800 nm light source is used to irradiate sepiolite in the cavity and surface of sepiolite to achieve adsorption-desorption balance, and sepiolite is activated by light source to generate Si-OH health Break and form reactive oxygen species such as hydroxyl radicals, so as to achieve the purpose of oxidative degradation of antibiotics.
为了达到上述目的，本发明采用了以下技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种光活海泡石Si-OH用于水溶性有机污染物吸附与光降解的方法，包括以下步骤：A method for photoactivating sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, comprising the following steps:
（1）在常温下，向含有有机污染物的水溶液中加入海泡石粉末，搅拌使得溶液中有机污染物在海泡石固/液界面，包括海泡石的内腔和表面达到吸附脱附平衡；(1) At room temperature, add sepiolite powder to the aqueous solution containing organic pollutants, and stir to make the organic pollutants in the solution reach adsorption and desorption at the solid/liquid interface of sepiolite, including the inner cavity and surface of sepiolite balance;
（2）水溶液中有机污染物在海泡石固/液界面吸附脱附平衡后，采用过滤或者离心的方式固液分离，得吸附了有机污染物的海泡石粉末，并进行干燥；(2) After the organic pollutants in the aqueous solution are adsorbed and desorbed at the sepiolite solid/liquid interface, the solid-liquid is separated by filtration or centrifugation, and the sepiolite powder adsorbed with organic pollutants is obtained and dried;
（3）开启光强为5-50 mW cm-2，波长为100-800 nm的光源，照射吸附了有机污染物的海泡石粉末，海泡石以分子筛形式存在的Si-OH基在太阳光光源的作用下发生Si-OH健断裂产生羟基自由基等活性氧物种，从而对有机污染物氧化降解。(3) Turn on a light source with a light intensity of 5-50 mW cm-2 and a wavelength of 100-800 nm to irradiate the sepiolite powder adsorbed with organic pollutants. The Si-OH groups of sepiolite in the form of molecular sieves Under the action of the light source, the Si-OH bond breaks to generate reactive oxygen species such as hydroxyl radicals, thereby oxidizing and degrading organic pollutants.
进一步地，所述的光源优选模拟太阳光光源，光强为5-50 mW cm-2，更优选光强为50 mW cm-2；波长为100-800 nm，更优选为400 nm。Further, the light source is preferably a simulated sunlight light source, the light intensity is 5-50 mW cm-2 , more preferably 50 mW cm-2 ; the wavelength is 100-800 nm, more preferably 400 nm.
进一步地，步骤（1）中，所述的海泡石为海泡石原矿、α-海泡石粉体和β-海泡石粉体中的一种或两种以上，优选为α-海泡石粉体。Further, in step (1), the sepiolite is one or more of sepiolite raw ore, α-sepiolite powder and β-sepiolite powder, preferably α-sepiolite Foam powder.
进一步地，步骤（1）中，海泡石在水溶液中的质量体积比为1~50 g/L。Further, in step (1), the mass volume ratio of sepiolite in the aqueous solution is 1-50 g/L.
进一步地，有机污染物主要是指水溶性有机污染物，包括有机染料、农药、抗生素等有机物，所述的有机污染物的尺寸小于100×500×100 nm。Further, organic pollutants mainly refer to water-soluble organic pollutants, including organic dyes, pesticides, antibiotics and other organic substances, and the size of said organic pollutants is less than 100×500×100 nm.
进一步地，步骤（1）中，搅拌时间为30~120分钟。Further, in step (1), the stirring time is 30-120 minutes.
进一步地，步骤（2）中，干燥温度为40~60℃，干燥时间为2~3小时。Further, in step (2), the drying temperature is 40-60° C., and the drying time is 2-3 hours.
进一步地，步骤（3）中，照射时间为2-36小时。Further, in step (3), the irradiation time is 2-36 hours.
进一步地，还包括海泡石的回收，具体为：吸附了有机污染物的海泡石在固/气界面光催化反应后，100-200℃活化后再次作为吸附剂和催化剂重复利用。Further, it also includes the recovery of sepiolite, specifically: after the photocatalytic reaction of the solid/air interface, the sepiolite adsorbed with organic pollutants is activated at 100-200°C and reused as an adsorbent and catalyst again.
本发明与现有技术相比具有以下优点和有益的效果：Compared with the prior art, the present invention has the following advantages and beneficial effects:
1) 与现有海泡石对有机物污染物的处理技术相比，本发明在海泡石完成吸附后利用光源活化海泡石Si-OH基，使其产生羟基自由基等活性氧物种，从而对水体环境中有机污染物的降解起到吸附和氧化降解的协同作用，大大提高了有机污染物的处理效率，拓宽了海泡石的应用范围。1) Compared with the existing sepiolite treatment technology for organic pollutants, the present invention utilizes the light source to activate the sepiolite Si-OH group after the sepiolite is completely adsorbed, so that it produces active oxygen species such as hydroxyl radicals, thereby It has a synergistic effect of adsorption and oxidative degradation on the degradation of organic pollutants in the water environment, greatly improving the treatment efficiency of organic pollutants and broadening the application range of sepiolite.
2) 本发明提供的海泡石主要针对水环境中有机污染物的去除，有机污染物包括有机染料、农药、抗生素等。海泡石对水溶性有机污染物适应性强，广谱性好，分子尺寸小于100×500×100 nm有机污染物，均具有较好的吸附和氧化降解的效果。2) The sepiolite provided by the present invention is mainly aimed at the removal of organic pollutants in the water environment. Organic pollutants include organic dyes, pesticides, antibiotics, etc. Sepiolite has strong adaptability to water-soluble organic pollutants, good broad-spectrum, and organic pollutants with molecular sizes less than 100×500×100 nm, all of which have good adsorption and oxidative degradation effects.
3) 本发明所采用的海泡石在水溶液中结构稳定，易于回收，经过活化处理后可以重复循环利用，且活性能在多次循环中基本保持不变。3) The sepiolite used in the present invention has a stable structure in aqueous solution, is easy to recycle, can be recycled repeatedly after activation treatment, and the activity energy remains basically unchanged in multiple cycles.
4) 本发明工艺流程简单，便于操作，且非常绿色环保，不会产生二次污染，具备广阔的应用前景。4) The process of the present invention is simple, easy to operate, very green and environmentally friendly, will not produce secondary pollution, and has broad application prospects.
具体实施方式Detailed ways
下面结合具体实施例对本发明作进一步的描述，但本发明并不限于此。The present invention will be further described below in conjunction with specific examples, but the present invention is not limited thereto.
实施例1Example 1
一种光活海泡石Si-OH用于水溶性有机污染物吸附与光降解的方法，具体步骤如下：A method for photoactivating sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, the specific steps are as follows:
(1) 室温下配置100 μmol/L的酸性红37溶液，取100 ml溶液于250 ml反应器内，加入2 g α-海泡石粉末，搅拌1 h，使得酸性红37在海泡石固/液界面达到吸附脱附平衡；(1) Prepare 100 μmol/L Acid Red 37 solution at room temperature, take 100 ml of the solution in a 250 ml reactor, add 2 g of α-sepiolite powder, and stir for 1 h, so that Acid Red 37 is solidified in the sepiolite The /liquid interface reaches adsorption-desorption equilibrium;
(2) 采用过滤的方式固液分离，得到吸附了酸性红37的海泡石粉末，在50℃条件下干燥3小时；(2) Separation of solid and liquid by filtration to obtain sepiolite powder adsorbed with Acid Red 37, and dry at 50°C for 3 hours;
(3) 开启氙灯模拟太阳光光源，照射干燥后的海泡石粉末，使有机污染物在海泡石固/气界面其发生氧化降解反应6小时；(3) Turn on the xenon lamp to simulate the sunlight light source, irradiate the dried sepiolite powder, and make the organic pollutants oxidize and degrade at the sepiolite solid/gas interface for 6 hours;
(4) 反应结束，收集海泡石粉末，150℃活化后循环利用。(4) After the reaction is over, collect the sepiolite powder and activate it at 150°C for recycling.
实施例2至4Examples 2 to 4
将酸性红37分别替换为酸性黄17、媒染橙1或茜素黄GG。Replace Acid Red 37 with Acid Yellow 17, Mordant Orange 1 or Alizarin Yellow GG, respectively.
对步骤（1）中有机污染物吸附脱附平衡后水溶液进行有机污染物含量的测试得海泡石对有机污染物的吸附率，吸附率 = ( C0-C1) /C0×100%，其中C0有机污染物溶液初始浓度，C1是吸附平衡后溶液中有机污染物的浓度。对步骤（3）中光催化反应后的海泡石样品进行有机污染物的含量测试得最终的有机污染物的降解率，降解率 = ( C0-C1-C2) /( C0-C1)×100%，其中C2是光催化反应以后残留在海泡石界面有机污染物的折合浓度，实验结果如表1所示。表1结果表明酸性红37、酸性黄17、媒染橙1和茜素黄GG等有机染料在海泡石表面体现了均有较好的吸附效果，吸附率在85%-91%之间，而吸附了有机污染物的海泡石粉末在以氙灯模拟太阳光源的照射下，反应4-8小时，有机染料的降解率均可以达到80%以上。Test the content of organic pollutants in the aqueous solution after organic pollutant adsorption and desorption equilibrium in step (1) to obtain the adsorption rate of sepiolite for organic pollutants, adsorption rate = ( C0 -C1 ) /C0 ×100% , whereC0 is the initial concentration of the organic pollutant solution, andC1 is the concentration of the organic pollutant in the solution after adsorption equilibrium. Test the content of organic pollutants on the sepiolite sample after the photocatalytic reaction in step (3) to obtain the final degradation rate of organic pollutants, degradation rate = ( C0 -C1 -C2 ) /( C0 - C1 )×100%, where C2 is the converted concentration of organic pollutants remaining on the sepiolite interface after the photocatalytic reaction. The experimental results are shown in Table 1. The results in Table 1 show that organic dyes such as acid red 37, acid yellow 17, mordant orange 1 and alizarin yellow GG all have good adsorption effects on the surface of sepiolite, and the adsorption rate is between 85% and 91%, while The sepiolite powder adsorbed with organic pollutants reacts for 4-8 hours under the irradiation of xenon lamp to simulate the sun light source, and the degradation rate of organic dyes can reach more than 80%.
表1有机染料在光活化海泡石Si-OH反应体系下的吸附率和降解率
对比现有海泡石对有机染料的处理技术，仅仅停留在对有机染料的吸附去除方面，而本发明则在原有吸附技术的基础上，进一步发明了海泡石Si-OH的活化方法，吸附了有机污染物的海泡石在光源的照射下发生氧化反应，有机污染物获得了较好的去除效果。Compared with the existing sepiolite treatment technology for organic dyes, which only stays in the adsorption and removal of organic dyes, the present invention further invents the activation method of sepiolite Si-OH on the basis of the original adsorption technology, and the adsorption The sepiolite depleted of organic pollutants undergoes oxidation reaction under the irradiation of light source, and the removal effect of organic pollutants is better.
实施例5Example 5
一种光活海泡石Si-OH用于水溶性有机污染物吸附与光降解的方法，具体步骤如下：A method for photoactivating sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, the specific steps are as follows:
(1) 室温下配置100 μmol/L的噻虫嗪溶液，取100 ml溶液于250 ml反应器内，加入2 g α-海泡石粉末，搅拌1 h，使得噻虫嗪在海泡石固/液界面达到吸附脱附平衡；(1) Prepare a 100 μmol/L thiamethoxam solution at room temperature, take 100 ml of the solution in a 250 ml reactor, add 2 g of α-sepiolite powder, and stir for 1 h to make thiamethoxam solidified in the sepiolite. The /liquid interface reaches adsorption-desorption equilibrium;
(2) 采用过滤的方式固液分离，得到吸附了噻虫嗪的海泡石粉末，在60℃条件下干燥2小时；(2) Separation of solid and liquid by filtration to obtain sepiolite powder adsorbed with thiamethoxam, and dry at 60°C for 2 hours;
(3) 开启氙灯模拟太阳光光源，照射干燥后的海泡石粉末，使有机污染物在海泡石固/气界面其发生氧化降解反应6小时；(3) Turn on the xenon lamp to simulate the sunlight light source, irradiate the dried sepiolite powder, and make the organic pollutants oxidize and degrade at the sepiolite solid/gas interface for 6 hours;
(4) 反应结束，收集海泡石粉末，100-200 ℃活化后循环利用。(4) After the reaction is over, collect the sepiolite powder and activate it at 100-200 °C for recycling.
实施例6至8Examples 6 to 8
将噻虫嗪分别替换为噻虫胺、克百威或敌草隆。Replace thiamethoxam with clothianidin, carbofuran, or diuron, respectively.
对步骤（1）中有机污染物吸附脱附平衡后水溶液进行有机污染物含量的测试得海泡石对有机污染物的吸附率，吸附率 = ( C0-C1) /C0×100%，其中C0有机污染物溶液初始浓度，C1是吸附平衡后溶液中有机污染物的浓度。对步骤（3）中光催化反应后的海泡石样品进行有机污染物的含量测试得最终的有机污染物的降解率，降解率 = ( C0-C1-C2) /( C0-C1)×100%，其中C2是光催化反应以后残留在海泡石界面的有机污染物折合浓度，实验结果如表2所示。表2结果表明噻虫嗪、噻虫胺、克百威和敌草隆等有机农药在海泡石表面体现了均有较好的吸附效果，吸附率在85%以上，而吸附了有机污染物的海泡石粉末在以氙灯模拟太阳光源的照射下，反应4-8小时，有机农药的降解率均可以达到80%左右。Test the content of organic pollutants in the aqueous solution after organic pollutant adsorption and desorption equilibrium in step (1) to obtain the adsorption rate of sepiolite for organic pollutants, adsorption rate = ( C0 -C1 ) /C0 ×100% , whereC0 is the initial concentration of the organic pollutant solution, andC1 is the concentration of the organic pollutant in the solution after adsorption equilibrium. Test the content of organic pollutants on the sepiolite sample after the photocatalytic reaction in step (3) to obtain the final degradation rate of organic pollutants, degradation rate = ( C0 -C1 -C2 ) /( C0 - C1 )×100%, where C2 is the converted concentration of organic pollutants remaining on the sepiolite interface after the photocatalytic reaction. The experimental results are shown in Table 2. The results in Table 2 show that organic pesticides such as thiamethoxam, clothianidin, carbofuran, and diuron have good adsorption effects on the surface of sepiolite, with an adsorption rate of more than 85%, while adsorbing organic pollutants The sepiolite powder reacts for 4-8 hours under the irradiation of xenon lamp to simulate the sun light source, and the degradation rate of organic pesticides can reach about 80%.
表2有机农药在光活化海泡石Si-OH反应体系下的吸附率和降解率
对比现有海泡石对有机农药的处理技术，仅仅停留在对有机农药的吸附去除方面，而本发明则在原有吸附技术的基础上，进一步发明了海泡石Si-OH的活化方法，吸附了有机污染物的海泡石在光源的照射下，发生氧化反应，有机污染物获得了较好的去除效果。Compared with the existing sepiolite treatment technology for organic pesticides, which only stays in the adsorption and removal of organic pesticides, the present invention further invents the activation method of sepiolite Si-OH on the basis of the original adsorption technology. The sepiolite depleted of organic pollutants undergoes an oxidation reaction under the irradiation of a light source, and the organic pollutants are better removed.
实施例9Example 9
一种光活海泡石Si-OH用于水溶性有机污染物吸附与光降解的方法，具体步骤如下：A method for photoactivating sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, the specific steps are as follows:
(1) 室温下配置100 μmol/L的阿替洛尔溶液，取100 ml溶液于250 ml反应器内，加入2 g α-海泡石粉末，搅拌1 h，使得阿替洛尔在海泡石固/液界面达到吸附脱附平衡；(1) Prepare a 100 μmol/L atenolol solution at room temperature, take 100 ml of the solution in a 250 ml reactor, add 2 g of α-sepiolite powder, and stir for 1 h to make atenolol in the sea foam The stone-solid/liquid interface reaches adsorption-desorption equilibrium;
(2) 采用过滤的方式固液分离，得到吸附了阿替洛尔的海泡石粉末，在40-60 ℃条件下干燥1-2小时；(2) Solid-liquid separation by filtration to obtain sepiolite powder adsorbed with atenolol, and dry at 40-60°C for 1-2 hours;
(3) 开启氙灯模拟太阳光光源，照射干燥后的海泡石粉末，使有机污染物在海泡石固/气界面其发生氧化降解反应4-8小时；(3) Turn on the xenon lamp to simulate the sunlight light source, irradiate the dried sepiolite powder, and make the organic pollutants oxidize and degrade at the sepiolite solid/gas interface for 4-8 hours;
(4) 反应结束，收集海泡石粉末，100-200 ℃活化后循环利用。(4) After the reaction is over, collect the sepiolite powder and activate it at 100-200 °C for recycling.
实施例10至12Examples 10 to 12
将阿替洛尔分别替换为磺胺氯哒嗪、环丙沙星或拉夫米定。Replace atenolol with sulfachloropyridazine, ciprofloxacin, or lavumidine, respectively.
对步骤（1）中有机污染物吸附脱附平衡后水溶液进行有机污染物含量的测试得海泡石对有机污染物的吸附率，吸附率 = ( C0-C1) /C0×100%，其中C0有机污染物溶液初始浓度，C1是吸附平衡后溶液中有机污染物的浓度。对步骤（3）中光催化反应后的海泡石样品进行有机污染物的含量测试得最终的有机污染物的降解率，降解率 = ( C0-C1-C2) /( C0-C1)×100%，其中C2是光催化反应以后残留在海泡石界面的有机污染物折合浓度，实验结果如表3所示。表3结果表明阿替洛尔、磺胺氯哒嗪、环丙沙星和拉夫米定等有机农药在海泡石表面体现了均有较好的吸附效果，吸附率在85%以上，而吸附了有机污染物的海泡石粉末在以氙灯模拟太阳光源的照射下，反应4-8小时，抗生素的降解率均可以达到80%左右。Test the content of organic pollutants in the aqueous solution after organic pollutant adsorption and desorption equilibrium in step (1) to obtain the adsorption rate of sepiolite for organic pollutants, adsorption rate = ( C0 -C1 ) /C0 ×100% , whereC0 is the initial concentration of the organic pollutant solution, andC1 is the concentration of the organic pollutant in the solution after adsorption equilibrium. Test the content of organic pollutants on the sepiolite sample after the photocatalytic reaction in step (3) to obtain the final degradation rate of organic pollutants, degradation rate = ( C0 -C1 -C2 ) /( C0 - C1 )×100%, where C2 is the converted concentration of organic pollutants remaining on the sepiolite interface after the photocatalytic reaction. The experimental results are shown in Table 3. The results in Table 3 show that organic pesticides such as atenolol, sulfachloropyridazine, ciprofloxacin and lavamidine have good adsorption effects on the surface of sepiolite, and the adsorption rate is above 85%. The sepiolite powder of organic pollutants reacts for 4-8 hours under the irradiation of xenon lamp to simulate the sun light source, and the degradation rate of antibiotics can reach about 80%.
表3抗生素在光活化海泡石Si-OH反应体系下的吸附率和降解率
对比现有海泡石对抗生素的处理技术，仅仅停留在对抗生素的吸附去除方面，而本发明则在原有吸附技术的基础上，进一步发明了海泡石Si-OH的活化方法，吸附了有机污染物的海泡石在光源的照射下，发生氧化反应，有机污染物获得了较好的去除效果。Compared with the existing sepiolite treatment technology for antibiotics, which only stays in the adsorption and removal of antibiotics, the present invention further invents the activation method of sepiolite Si-OH on the basis of the original adsorption technology, and absorbs organic The sepiolite of pollutants undergoes oxidation reaction under the irradiation of light source, and the organic pollutants are better removed.
实施例13Example 13
一种光活海泡石Si-OH用于水溶性有机污染物吸附与光降解的方法，具体步骤如下：A method for photoactivating sepiolite Si-OH for adsorption and photodegradation of water-soluble organic pollutants, the specific steps are as follows:
(1) 室温下配置100 μmol/L的阿替洛尔溶液，取100 ml溶液于250 ml反应器内，加入2 g α-海泡石粉末，搅拌1 h，使得阿替洛尔在海泡石固/液界面达到吸附脱附平衡；(1) Prepare a 100 μmol/L atenolol solution at room temperature, take 100 ml of the solution in a 250 ml reactor, add 2 g of α-sepiolite powder, and stir for 1 h to make atenolol in the sea foam The stone-solid/liquid interface reaches adsorption-desorption equilibrium;
(2) 采用过滤的方式固液分离，得到吸附了阿替洛尔的海泡石粉末，在40-60 ℃条件下干燥1-2小时；(2) Solid-liquid separation by filtration to obtain sepiolite powder adsorbed with atenolol, and dry at 40-60°C for 1-2 hours;
(3) 开启氙灯模拟太阳光光源，照射干燥后的海泡石粉末，使有机污染物在海泡石固/气界面其发生氧化降解反应4-8小时；(3) Turn on the xenon lamp to simulate the sunlight light source, irradiate the dried sepiolite powder, and make the organic pollutants oxidize and degrade at the sepiolite solid/gas interface for 4-8 hours;
(4) 反应结束，收集海泡石粉末，100-200 ℃活化后用于下一批反应。表4是海泡石对100 μmol/L阿替洛尔4次循环后吸附率和降解率的变化情况，海泡石对阿替洛尔的吸附率和降解率均保持不变。(4) After the reaction is over, collect the sepiolite powder and activate it at 100-200 °C for the next batch of reactions. Table 4 shows the changes in the adsorption rate and degradation rate of sepiolite to 100 μmol/L atenolol after 4 cycles, and the adsorption rate and degradation rate of sepiolite to atenolol remained unchanged.
表4海泡石循环使用对阿替洛尔吸附率和降解率的影响
以上实施例表明，利用海泡石对有机污染物的吸附并激活海泡石Si-OH产生羟基自由基对有机污染物进行降解，两者协同发挥作用，从而达到氧化降解水溶液中有机污染物的目的，针对大部分有机污染物吸附率在85%以上，而降解率则80%左右。此外，海泡石易于回收，循环使用效果好。The above examples show that the use of sepiolite to adsorb organic pollutants and activate sepiolite Si-OH to generate hydroxyl radicals to degrade organic pollutants, and the two work together to achieve oxidative degradation of organic pollutants in aqueous solution The purpose is that the adsorption rate of most organic pollutants is above 85%, while the degradation rate is about 80%. In addition, sepiolite is easy to recover and has a good recycling effect.
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