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標題

咖啡渣生物炭去除水中四環黴素之研究

作者

阮文直 Nguyen Van Truc

出版單位

國立高雄科技大學 海洋工程學院海洋科技產學合作博士班

出版年月日

2019/07/15

原文摘要

Tetracycline (TC) is used to treat human, animal and aquaculture diseases, becoming an interesting research topic in recent years because of its residues in the aquatic environment. This leads to adverse effects on ecosystem and human health. There are many treatment technologies applied to remove TC in water, such as oxidation, adsorption, membrane separation, and biodegradation. In which, adsorbents derived agricultural biomass (biochar) have been demonstrated to be effective for emerge organic contaminations. Spent coffee ground (SCG) has small particle size and high carbon content, which favor for pollutant adsorption. However, its use seems to be ignored. Therefore, in this study, biochar derived from spent ground coffee (SGC) under various pyrolysis temperatures (300 - 900 oC) was applied to absorb TC from aqueous solution. In order to improve and degrade TC completely, SCG biochar was modified as catalysts by impregnating iron and cobalt ions. Effects of parameters (pH, pyrolysis temperature, oxidant (persulfate - PS, peroxymonosulfate - PMS) dosage, initial TC concentration, and catalyst dosage) on TC degradation of biochar and PAH production in biochar and bio-oil were evaluated in this study. Moreover, TC adsorption isotherms and degradation mechanisms were also determined. Results showed that biochar synthesized at 500 oC (SCG 500) contained low PAHs (600 µg kg-1) and had the highest TC adsorption efficiency (at pH 7). The presence of ions in salinity solution significantly reduced the capacity of SCG 500. For SCG modified with magnetite (Fe3+), the highest removal efficiency (96%) was achieved by PS/Fe-SCG under the conditions of pH = 2.0, [Fe-SCG] = 2.5 g L-1, [PS] = 60 mM and [TC] = 1 mM. The maximum adsorption capacity of PS/Fe-SCG for TC was 18.73 mg g-1. For Cobalt-impregnated SCG, the highest removal efficiency was achieved by PMS/Co-SCG under the conditions of pH = 7.0, [Co-SCG] = 100 mg L-1, [PMS] = 0.6 mM and [TC] = 0.2 mM. TC was almost completely degraded in 25 min with a degradation rate constant of 0.1778 min-1. The maximum adsorption capacity of Co-SCG biochar for TC was 370.37 mg g-1. The concentration of 16 PAHs on Co-SCG biochar (715 µg kg-1) significantly was lower than those of other biochars prepared from different materials and was within the permissible limit according to the European Biochar Certificate and the International Biochar Initiative. Generally, results demonstrated that SCG was effective removal, safety PAHs level, low-cost and eco-friendly materials for tetracycline from water.

原文摘要簡述

四環黴素(TC)用於治療人類,動物和水產養殖疾病,近年來,由於其殘基可存活於水生環境成為一個熱門的研究主題。由於其殘基可存活於水生環境對生態系統及人類健康產生不利影響。有許多治療技術應用於用於去除水中的四環黴素(TC),例如氧化,吸附,膜過濾和生物分解。其中,農業生物質(生物炭)具有衍生的吸附功能已經被證實對有機污染物有效。咖啡渣(SCG)顆粒小且碳含量高,有利於吸附污染物。 但是,它的用途似乎被忽略了。因此,在這項研究中,使用咖啡渣(SCG)在各種熱裂解溫度(300-900℃)下衍生的生物炭來吸收水溶液中的四環黴素(TC)。為了改善和完全降解四環黴素(TC),咖啡渣(SCG)生物炭在浸漬鐵與鈷離子後被變更性質為觸媒(催化劑)。在本研究中,評估了參數(pH(酸鹼值),熱裂解溫度,氧化劑(過硫酸鹽-PS,過氧化單硫酸鹽-PMS)劑量,初始四環黴素(TC)濃度和催化劑劑量)對生物炭四環黴素(TC)降解以及生物炭和生物油中多環芳香烴(PAH)產生的影響。此外,更確定了四環黴素(TC)的吸附等溫線和降解機制。

關鍵字

Tetracycline、Spent coffee ground、Adsorption、Degradation、Persulfate、Peroxymonosulfate

連結

https://hdl.handle.net/11296/q9285h

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