CN111186844A - 一种用于吸附VOCs的粉煤灰基沸石分子筛的制备方法 - Google Patents
一种用于吸附VOCs的粉煤灰基沸石分子筛的制备方法 Download PDFInfo
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Abstract
本发明提供了一种用于吸附VOCs的粉煤灰基沸石分子筛的制备方法,具体为:(1)粉煤灰与盐酸在100℃反应后抽滤、水洗、烘干得到预处理粉煤灰;(2)预处理粉煤灰与氢氧化钠溶液反应30min~60min;(3)反应固液混合物陈化4h~8h,在110℃~130℃晶化3h~10h,将滤渣干燥、磨细得初品;(4)每1 g初品中加15mL~30mLCTAB溶液,改性20min~40min,抽滤、干燥、磨细得到CTAB改性的粉煤灰基沸石分子筛。本发明以粉煤灰为原料制备CTAB改性粉煤灰基沸石分子筛,制备工艺简单、生产效率高,既能够消纳粉煤灰固废,又能够降低生产成本和能耗,有利于规模化生产。
Description
技术领域
本发明属于固体废弃物综合利用领域,具体涉及一种以粉煤灰为原料制备用于转轮法吸附处理VOCs的高Si/Al比的沸石分子筛的方法。
背景技术
长期以来,采用以活性炭作为吸附剂处理废水废气,由于成本较高,应用受到限制。近年来沸石吸附剂逐渐得到市场青睐。但是,天然沸石开采破坏生态环境,加之进一步加工成本亦不低。如何低成本的解决废气的净化成本成为当务之急。
粉煤灰作为火力发电厂的副产物,本身就是一种具有污染性的固体废弃物,随意堆放或填埋会污染大气和地下水资源。粉煤灰主要成分为SiO2和Al2O3,通常这两者可占到总体的60%以上,可以利用粉煤灰的这一特点,同时为满足转轮法使用要求,将粉煤灰中的Si、Al相分离,利用Si相制备高Si/Al比的疏水性沸石分子筛,作为VOCs吸附处理剂,Al相可用作制备水处理剂的原料,既为粉煤灰提供了一条资源化利用的途径,又能得到一种低成本的沸石分子筛产品,下游含铝废液还可用来制备水处理剂,实现零排放。
目前,我国已有大量利用粉煤灰合成沸石分子筛在吸附废水方面的报道,但用于VOCs治理方面的研究还较少,尤其是适用于转轮法处理VOCs方面的研究还未见报道,如果将粉煤灰制备成适用于转轮法治理VOCs的高Si/Al比的沸石分子筛,则会大大降低我国废气治理方面的成本。
发明内容
本发明提供了一种以粉煤灰为原料制备沸石分子筛的方法,通过水热-微波反应,高压反应釜高温晶化,利用粉煤灰中含有的大量Si、Al相,制备沸石分子筛。
一种用于吸附VOCs的粉煤灰基沸石分子筛的制备方法,具体步骤为:
(1)将粉煤灰干燥、磨细,然后加入盐酸在100℃搅拌加热30min~60min(除去粉煤灰中的Al、Fe、Ca等杂质,以提高原料Si/Al比,降低吸水率,减小水分子的竞争吸附),然后抽滤,水洗,烘干,得到预处理粉煤灰。
(2)将步骤(1)得到的预处理粉煤灰加入到反应器中,再加入氢氧化钠溶液,利用微波加热在70℃~90℃搅拌回流反应30min~60min;氢氧化钠溶液浓度为6mol/L~10mol/L,每1g预处理粉煤灰中加入7mL~11mL的氢氧化钠溶液。
(3)将步骤(2)得到的固液混合物移入到高压反应釜中陈化4h~8h形成稳定的沸石分子筛晶核,然后在110℃~130℃晶化3h~10h,晶化结束后,抽滤,将滤渣干燥、磨细得到粉煤灰基沸石分子筛初品。
(4)在每1 g粉煤灰基沸石分子筛初品中加入15mL~30mL十六烷基三甲基溴化铵溶液(CTAB溶液),振荡改性20min~40min,然后抽滤、干燥、磨细得到CTAB改性的粉煤灰基沸石分子筛;CTAB溶液浓度为2g/L。
上述方法步骤(1)中的盐酸浓度为2mol/L。
上述方法步骤(1)中Si、Al含量按照GB/T 176-2008《水泥化学分析方法》测得。
上述方法步骤(1)中沸石分子筛吸水率按照GB 6287-1986《分子筛静态水吸附测定方法》测得。
本发明的有益效果:
(1)利用粉煤灰合成的分子筛其静态饱和吸水率通常在20%以上,最高可达25.67%(见高闻言的硕士论文《粉煤灰改性合成分子筛及其吸附水性能的研究》第40页第1段)。本发明方法得到的CTAB改性粉煤灰基沸石分子筛Si/Al比为9.29,吸水率在1.20%~2.56%之间,其疏水性明显好于未改性的初品(见附图1、附图2),CTAB改性粉煤灰基沸石分子筛对VOCs的吸附值明显高于初品的吸附值。
(2)本发明以粉煤灰做原材料,采用微波加热以及CTAB改性制备CTAB改性粉煤灰基沸石分子筛,制备工艺简单、生产效率高,既能够消纳粉煤灰固废,又能够降低生产成本和能耗,有利于规模化生产。
(3)采用CTAB改性粉煤灰基沸石分子筛,进一步提升了分子筛初品的疏水性,提高了VOCs吸附值;CTAB改性前、后的粉煤灰基沸石分子筛疏水性见图1、图2。图1中:初品分子筛(深色部分)已经完全浸入到水中;图2中:CTAB改性后的分子筛部分(深色部分)浸入到水中,部分(浅色部分)漂浮在水面上。
(4)预处理工序既提高了硅铝比,又提高了沸石制备反应活性。去除金属成分后的下游废液可用来制备污水处理剂,实现废物零排放,经测试用废液制备的水处理剂对甲基橙的吸附量达到250 mg/g以上。
附图说明
附图1:未经CTAB改性的粉煤灰基沸石分子筛(即粉煤灰基沸石分子筛初品)与水的亲和性图片。
附图2:经CTAB改性后的粉煤灰基沸石分子筛与水的亲和性图片。
步骤为:在两个干燥烧杯底部分别滴上几滴水,然后将粉煤灰基沸石分子筛初品、CTAB改性的粉煤灰基沸石分子筛分别轻轻放到水滴上。粉煤灰基沸石分子筛初品很快就被水润湿,浸入到水滴中(深色部分)。CTAB改性的粉煤灰基沸石分子筛,一部分浸入水滴中(深色部分),一部分漂浮在水滴的液面上(浅色部分),甚至从水滴液面滑落。
具体实施方式
实施例一
(1)将粉煤灰干燥、磨细至比表面积320m2/kg,然后加入2mol/L盐酸在100℃搅拌加热30min,然后抽滤,水洗,烘干,得到预处理粉煤灰。
(2)将步骤(1)得到的预处理粉煤灰加入到反应器中,在每1g预处理粉煤灰中加入7mL的氢氧化钠溶液(10mol/L),利用微波加热在70℃搅拌回流反应30min。
(3)将步骤(2)中得到的固液混合物倒入高压反应釜中陈化6h形成稳定的沸石分子筛晶核,然后在130℃晶化5h,晶化结束后,抽滤,将滤渣干燥、磨细得到粉煤灰基沸石分子筛初品,测得初品对甲苯的吸附值为8mg/g。
(4)在每1 g粉煤灰基沸石分子筛初品中加入20mL十六烷基三甲基溴化铵溶液(CTAB溶液,2g/L),振荡改性30min,然后抽滤、干燥、磨细得到CTAB改性的粉煤灰基沸石分子筛,测得对甲苯的吸附值为36mg/g。
实施例二
(1)将粉煤灰干燥、磨细至比表面积356m2/kg,然后加入2mol/L盐酸在100℃搅拌加热40min,然后抽滤,水洗,烘干,得到预处理粉煤灰。
(2)将步骤(1)得到的预处理粉煤灰加入到反应器中,在每1g预处理粉煤灰中加入9mL的氢氧化钠溶液(8mol/L),利用微波加热在90℃搅拌回流反应45min。
(3)将步骤(2)中得到的固液混合物倒入高压反应釜中陈化4h形成稳定的沸石分子筛晶核,然后在120℃晶化3h,晶化结束后,抽滤,将滤渣干燥、磨细得到粉煤灰基沸石分子筛初品,测得初品对甲苯的吸附值为7mg/g。
(4)在每1g粉煤灰基沸石分子筛初品中加入15mL十六烷基三甲基溴化铵溶液(CTAB溶液,2g/L),振荡改性20min,然后抽滤、干燥、磨细得到CTAB改性的粉煤灰基沸石分子筛,测得对甲苯的吸附值为38mg/g。
实施例三
(1)将粉煤灰干燥、磨细至比表面积384m2/kg,然后加入2mol/L盐酸在100℃搅拌加热60min,然后抽滤,水洗,烘干,得到预处理粉煤灰。
(2)将步骤(1)得到的预处理粉煤灰加入到反应器中,在每1g预处理粉煤灰中加入11mL的氢氧化钠溶液(6mol/L),利用微波加热在80℃搅拌回流反应60min。
(3)将步骤(2)中得到的固液混合物倒入高压反应釜中陈化8h形成稳定的沸石分子筛晶核,然后在110℃晶化10h,晶化结束后,抽滤,将滤渣干燥、磨细得到粉煤灰基沸石分子筛初品,测得初品对甲苯的吸附值为10mg/g。
(4)在每1g粉煤灰基沸石分子筛初品中加入30mL十六烷基三甲基溴化铵溶液(CTAB溶液,2g/L),振荡改性40min,然后抽滤、干燥、磨细得到CTAB改性的粉煤灰基沸石分子筛,测得对甲苯的吸附值为38mg/g。
对比例一
将本发明中所用粉煤灰原料进行甲苯吸附值检测,测得对甲苯的吸附值为2 mg/g。
Claims (1)
1.一种用于吸附VOCs的粉煤灰基沸石分子筛的制备方法,其特征在于:
(1)将粉煤灰干燥、磨细,然后加入盐酸在100℃搅拌加热30min~60min,然后抽滤,水洗,烘干,得到预处理粉煤灰;盐酸浓度为2mol/L;
(2)将步骤(1)得到的预处理粉煤灰加入到反应器中,再加入氢氧化钠溶液,利用微波加热在70℃~90℃搅拌回流反应30min~60min;氢氧化钠溶液浓度为6mol/L~10mol/L,每1g预处理粉煤灰中加入7mL~11mL的氢氧化钠溶液;
(3)将步骤(2)得到的固液混合物移入到高压反应釜中陈化4h~8h形成稳定的沸石分子筛晶核,然后在110℃~130℃晶化3h~10h,晶化结束后,抽滤,将滤渣干燥、磨细得到粉煤灰基沸石分子筛初品;
(4)在每1 g粉煤灰基沸石分子筛初品中加入15mL~30mL十六烷基三甲基溴化铵溶液(CTAB溶液),振荡改性20min~40min,然后抽滤、干燥、磨细得到CTAB改性的粉煤灰基沸石分子筛;CTAB溶液浓度为2g/L。
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