碳化橙汁渣脱除水中锶离子的研究

IF 0.8 Q4 ENVIRONMENTAL STUDIES
H. Paudyal, Bimala Pangeni, Prabina Basnet, K. Inoue
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引用次数: 0

摘要

以橙汁渣(OJR)为原料,经800℃炭化后制备了去除锶(II)离子的吸附剂。能量色散x射线(EDX)光谱分析表明,COJR样品中存在微量的P、Na、K、Fe以及C、Ca。考察了pH、接触时间、初始浓度、吸附剂投加量等参数对吸附效果的影响。COJR选择性吸附Sr(II)和Cs(I)的混合溶液中的Sr(II)。采用Langmuir和Freundlich等温线模型对吸附Sr(II)的实验数据进行分析,结果表明两种模型拟合良好,R2均大于0.98。采用24.3 mg/L Sr(II)溶液,料液比为1g/L, 1小时内达到吸附平衡。COJR对Sr(II)离子的最大吸附量(Qmax)和吸附平衡常数(b)分别为322.58 mmol/kg和1.93 L/mmol。采用大于4 g/L的COJR投加量,成功地将Sr(II)浓度降至EPA标准(4 mg/L)。吸附的Sr(II)可以用0.5M的盐酸溶液成功解吸。上述结果表明,COJR对Sr(II)离子具有较高的亲和力,有望作为一种有前途的吸附材料用于污水中Sr(II)离子的去除。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Studies on the Removal of Sr(II) Ions from Water Using Carbonized Orange Juice Residue
The adsorbent for Sr(II) ion removal was prepared from orange juice residue (OJR) after carbonization at 800°C. An energy dispersive X-ray (EDX) spectroscopic analysis showed the existence of trace amounts of P, Na, K, and Fe together with C and Ca in the examined sample of COJR. The adsorption parameters such as effect of pH, contact time, initial Sr(II) concentration and adsorbent dosage were studied. COJR selectively adsorbed Sr(II) from the mixed solution containing Sr(II) and Cs(I). Experimental data obtained for the adsorption of Sr(II) were analyzed by using Langmuir and Freundlich isotherm models, and the data were well fitted with both the models with R2 higher than 0.98. Adsorption equilibrium was achieved within one hour by using a 24.3 mg/L Sr(II) solution at a solid-liquid ratio of 1g/L. The maximum adsorption capacity (Qmax) and adsorption equilibrium constant (b) of COJR for Sr(II) ion were found to be 322.58 mmol/kg and 1.93 L/mmol, respectively. The concentration of Sr(II) was successfully lowered down to the EPA standard (4 mg/L) by using COJR dosage higher than 4 g/L. The adsorbed Sr(II) could be successfully desorbed using a dilute (0.5M) solution of hydrochloric acid. These results indicated that COJR investigated in this study showed a high affinity for Sr(II) ion thus it is expected to be employed as a promising adsorbent for the removal of Sr(II) ions from polluted water.
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来源期刊
CiteScore
1.50
自引率
10.00%
发文量
39
期刊介绍: IJESD addresses matters related to environment and sustainable development, paying special attention to relevant issues in developing countries while reporting on the latest environmental trends in industrialised nations. Its range of themes encompasses ecological studies, field research, empirical work and descriptive analyses on topics such as environmental systems, environmental policies and politics, environmental legislation, environmental impact assessment, water and energy related issues, and sustainability. Other matters related to or which influence the international debate on sustainability will be also considered. Topics covered include: -Global environmental issues- Agenda 21- Energy, water, recycling, waste management- Environmental reports- Environmental policies and action plans- Environmental systems- Environmental legislation- Environmental impact assessment- Sustainable development approaches and methods.
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