Synthesis of Matrix Si-K-HAs Gel from Geothermal Sludge and Peat

Srie Muljani, B. Wahyudi, S. Suprihatin, K. Sumada
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引用次数: 7

Abstract

The synthesis of matrix silica-potassium-humic acid gel (Si-K-HAs) has been performed successfully by gradual extraction and acidification method. The extraction was carried out in two stages: 1) extraction of humic substances from peat prepared by potassium hydroxide to produce potassium humate (K-HAS) solution, 2) extraction silica from geothermal sludge using K-HAs solution to produce Si-K-HAs solution. Acidification of Si-K-HAs solution prepared by citric acid (1-3N) to produce matrix gel of Si-K-HAs. The Si-K-HAs matrix gel products are characterized by Fourier Transform InfraRed (FTIR), X-ray fluroscence (XRF), and Brunauer–Emmett–Teller (BET) analysis. The acidification process was carried out in neutral to acid (pH 3-7) conditions and the results showed that at neutral pH no Si-K-HAs gel formed. IR spectra confirmed the presence of humic acid in the gel product, whereas XRF analysis confirmed the presence of potassium (K) and silica (SiO2) in the gel product. The molar ratio of SiO2:K2O in the product is 0.9 - 0.3 in the pH range of 3-5. Si-K-HAs powder can be used as soil fertilizer especially for soils that lack silica, humic, and potassium nutrients or for future application development. Keywords: gradual extraction; geothermal sludge; matrix gel; humic substance
以地热污泥和泥炭为原料合成基质Si-K-HAs凝胶
采用渐进式萃取酸化法成功地合成了硅-钾-腐植酸凝胶。提取分两个阶段进行:1)从氢氧化钾制备的泥炭中提取腐植酸钾(K-HAS)溶液,2)用K-HAS溶液从地热污泥中提取二氧化硅,得到Si-K-HAs溶液。柠檬酸(1-3N)对Si-K-HAs溶液进行酸化制备Si-K-HAs基质凝胶。采用傅里叶变换红外(FTIR)、x射线荧光(XRF)和布鲁诺尔-埃米特-泰勒(BET)分析对Si-K-HAs基质凝胶产物进行了表征。酸化过程在中性至酸性(pH 3-7)条件下进行,结果表明在中性pH下Si-K-HAs不形成凝胶。红外光谱证实凝胶产物中存在腐植酸,而XRF分析证实凝胶产物中存在钾(K)和硅(SiO2)。在pH值为3 ~ 5的范围内,产品中SiO2:K2O的摩尔比为0.9 ~ 0.3。Si-K-HAs粉可以用作土壤肥料,特别是缺乏二氧化硅,腐殖质和钾养分的土壤或用于未来的应用开发。关键词:渐进式萃取;地热污泥;矩阵凝胶;腐殖质物质
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