Scholarlink

<p>The cultivation of aloe vera and the exploitation of the valuable gel is an emerging agro-industry in various parts of the world, including the Mediterranean region and south-east Asia. Following the separation of the gel from the aloe vera leaf, the latter is considered waste and a sustainable valorization pathway has not been established so far. Due to its high moisture content, it is well-suited for hydrothermal carbonization (HTC). In this study, HTC of aloe vera leaves was carried out at temperatures of 180—220&#xa0;°C and residence times of 2- 8&#xa0;h. After an initial screening of the hydrochars for diesel oil (DO) adsorption, the optimum sample was prepared at 180&#xa0;°C and 2&#xa0;h treatment time (AV-180–2). This sample was characterized using elemental and surface analysis methods and was used without modification in the adsorption DO from aqueous solutions. The maximum achievable adsorption capacity of hydrochar AV-180–2 was 12&#xa0;g&#xa0;g<sup>−1</sup> at 25&#xa0;°C, with an initial DO content of 10&#xa0;g L<sup>−1</sup>, rotating speed of 100&#xa0;rpm, hydrochar quantity of 1.0&#xa0;g L<sup>−1</sup> and pH ~ 7.0, adsorption equilibrium was achieved after 15&#xa0;min of contact time. The adsorption process followed the pseudo-second-order kinetic model with a correlation coefficient R<sup>2</sup> = 0.995. The experimental data fitted best to the Freundlich isotherm (R<sup>2</sup> = 0.998) and the thermodynamic study indicated a spontaneous and endothermic adsorption process. Overall, hydrothermal carbonization offers a new and sustainable exploitation pathway for aloe vera waste and the hydrochars showed a promising behaviour towards DO-contaminated aqueous phases.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Treatment of Diesel Oil-Contaminated Water Using Hydrochar Derived from the Hydrothermal Carbonization of Aloe Vera Leaves

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月15日

查看全文
  • Ngoc-Thuy Vu,
  • Luong Huyen Trang,
  • Chung Nguyen Thuy,
  • Thi-Anh Tuyet Nguyen,
  • Erdal Yabalak,
  • Dimitrios Kalderis

摘要

The cultivation of aloe vera and the exploitation of the valuable gel is an emerging agro-industry in various parts of the world, including the Mediterranean region and south-east Asia. Following the separation of the gel from the aloe vera leaf, the latter is considered waste and a sustainable valorization pathway has not been established so far. Due to its high moisture content, it is well-suited for hydrothermal carbonization (HTC). In this study, HTC of aloe vera leaves was carried out at temperatures of 180—220 °C and residence times of 2- 8 h. After an initial screening of the hydrochars for diesel oil (DO) adsorption, the optimum sample was prepared at 180 °C and 2 h treatment time (AV-180–2). This sample was characterized using elemental and surface analysis methods and was used without modification in the adsorption DO from aqueous solutions. The maximum achievable adsorption capacity of hydrochar AV-180–2 was 12 g g−1 at 25 °C, with an initial DO content of 10 g L−1, rotating speed of 100 rpm, hydrochar quantity of 1.0 g L−1 and pH ~ 7.0, adsorption equilibrium was achieved after 15 min of contact time. The adsorption process followed the pseudo-second-order kinetic model with a correlation coefficient R2 = 0.995. The experimental data fitted best to the Freundlich isotherm (R2 = 0.998) and the thermodynamic study indicated a spontaneous and endothermic adsorption process. Overall, hydrothermal carbonization offers a new and sustainable exploitation pathway for aloe vera waste and the hydrochars showed a promising behaviour towards DO-contaminated aqueous phases.