Chieng Hei Ing, Lim Linda B L, Priyantha Namal
a Department of Chemistry, Faculty of Science , Universiti Brunei Darussalam , Jalan Tungku Link, Gadong , Negara Brunei Darussalam.
Environ Technol. 2015 Jan-Feb;36(1-4):86-97. doi: 10.1080/09593330.2014.938124. Epub 2014 Jul 14.
Breadnut skin, in both its unmodified (KS) and base-modified (BM-KS) forms, was investigated for its potential use as a low-cost adsorbent for the removal of toxic dye, malachite green (MG). Characterization of the adsorbents was carried out using scanning electron microscope, X-ray fluorescence and Fourier transform infra-red spectroscopy. Batch adsorption experiments, carried out under optimized conditions, for the adsorption of MG were fitted using five isotherm models (Langmuir, Freundlich, Dubinin-Radushkevich, Temkin and Sips) and six error functions to determine the best-fit model. The adsorption capacity was greatly enhanced when breadnut skin was chemically modified with NaOH, leading to an adsorption capacity of 353.0 mg g(-1), that was far superior to most reported adsorbents for the removal of MG. Thermodynamics studies indicated that the adsorption of MG was spontaneous on KS and BM-KS, and the reactions were endothermic and exothermic, respectively. Kinetics studies showed that both followed the pseudo-second order. Regeneration experiments on BM-KS indicated that its adsorption capacity was still maintained at>90% even after five cycles. It can be concluded that NaOH-modified breadfruit skin has great potential to be utilized in real-life application as a low-cost adsorbent for the removal of MG in wastewater treatment.
对未经改性（KS）和碱改性（BM-KS）的面包果壳进行了研究，探讨其作为低成本吸附剂用于去除有毒染料孔雀石绿（MG）的潜力。使用扫描电子显微镜、X射线荧光光谱和傅里叶变换红外光谱对吸附剂进行了表征。在优化条件下进行了批量吸附实验，用五种等温线模型（朗缪尔、弗伦德里希、杜宾宁-拉杜舍维奇、坦金和西普斯）和六种误差函数对MG的吸附进行拟合，以确定最佳拟合模型。用NaOH对面包果壳进行化学改性后，吸附容量大大提高，达到353.0 mg g⁻¹，远优于大多数报道的用于去除MG的吸附剂。热力学研究表明，MG在KS和BM-KS上的吸附是自发的，反应分别为吸热和放热。动力学研究表明，两者均符合准二级动力学。BM-KS的再生实验表明，即使经过五个循环，其吸附容量仍保持在90%以上。可以得出结论，NaOH改性的面包果壳作为一种低成本吸附剂，在废水处理中去除MG具有很大的实际应用潜力。
