Valorization of Waste Orange Peel to Produce Shear-Thinning Gels
Valorization of Waste Orange Peel to Produce Shear-Thinning Gels
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DOI：
10.1021/acs.jchemed.8b01009
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发表时间：
2019-12-01
影响因子：
3
通讯作者：
Hurst, Glenn A.
中科院分区：
文献类型：
--
作者：
Mackenzie, Lucy S.;Tyrrell, Helen;Hurst, Glenn A.
开发了一项实验室实验来向学生介绍废物的价值。这是对废物、有用产品或能源进行再利用、回收或堆肥的过程。在该实验室实验中，通过提取果胶基混合物（或溶胶）并与酸化糖溶液结合形成凝胶，将废橙皮（WOP）转化为果酱型凝胶，从而证明废物增值。分离果胶溶胶后，学生使用毛细管粘度计检查了流变特性如何随温度变化。通过旋转粘度测定法跟踪凝胶化，并通过监测作为主轴转速函数的粘度变化来证明非牛顿剪切稀化特性。该实验除了为学生提供传统硼砂交联聚（乙烯醇）凝胶的安全、绿色替代品供学习之外，还表明可以利用WOP等家庭垃圾生产有价值的日常用品。从自然科学学位本科化学课程一年级过渡到二年级的学生已经成功地进行了这项实验室实验。
A laboratory experiment was developed to introduce students to waste valorization. This is the process of reusing, recycling, or composting from wastes, useful products, or sources of energy. In this laboratory experiment, waste valorization is demonstrated through transforming waste orange peel (WOP) into a marmalade-type gel by extracting a pectin-based mixture (or sol) and forming a gel in combination with an acidified sugar solution. Upon isolating the pectin sol, students examined how the rheological properties varied as a function of temperature using capillary viscometry. Gelation was followed via rotational viscometry, and non-Newtonian, shear-thinning properties were demonstrated by monitoring the viscosity change as a function of spindle RPM. In addition to providing a safe and green alternative to the traditional borax-cross-linked poly(vinyl alcohol) gel for students to study, this experiment demonstrates that valuable products for everyday use can be created from household waste such as WOP. Students making the transition from a first to second year undergraduate chemistry program within a natural-sciences degree have successfully conducted this laboratory experiment.