Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
J Environ Health Sci Eng. 2013 Dec 19;11(1):29. doi: 10.1186/2052-336X-11-29.
The phenolic compounds are known by their carcinogenicity and high toxicity as well as creating unpleasant taste and odor in water resources. The present study develops a cost-effective technology for the treatment of water contaminated with phenolic compounds, including Phenol (Ph), 2-chlorophenol (2-CP), and 4-chlorophenol (4-CP). So, two sorbents, rice bran ash (RBA) and biomass of brown algae, Cystoseiraindica, were used and results were compared with the commercially granular activated carbon (GAC). The phenolic compounds were determined using a high performance liquid chromatography (HPLC) under batch equilibrium conditions. The effects of contact time, pH, initial adsorbate concentration, and adsorbent dosages on the removal efficiency were studied. The adsorption data were simulated by isotherm and kinetic models. Results indicated that RBA and GAC had the lowest efficiency for the removal of 2-CP, while the order of removal efficiency for C. indica biomass was as follows: 2-CP > 4-CP > phenol. The efficiency of GAC was higher than those of other adsorbents for all of the phenolic compounds. Furthermore, the adsorption capacity of RBA was found to be higher than that of C. indica biomass. The optimal initial pH for the removal of phenol, 2-CP and 4-CP was determined to be 5, 7, and 7 for RBA, GAC, and algal biomass, respectively. Kinetic studies suggested that the pseudo-second order best fitted the kinetic data.
酚类化合物具有致癌性和高毒性，会在水资源中产生不良的味道和气味。本研究开发了一种经济有效的技术，用于处理受酚类化合物污染的水，包括苯酚（Ph）、2-氯苯酚（2-CP）和 4-氯苯酚（4-CP）。因此，使用了两种吸附剂，米糠灰（RBA）和褐藻 Cystoseira indica 的生物质，并将结果与商业用颗粒活性炭（GAC）进行了比较。使用高效液相色谱（HPLC）在批量平衡条件下测定酚类化合物。研究了接触时间、pH 值、初始吸附质浓度和吸附剂用量对去除效率的影响。通过等温线和动力学模型模拟了吸附数据。结果表明，RBA 和 GAC 对 2-CP 的去除效率最低，而 C. indica 生物质的去除效率顺序如下：2-CP>4-CP>苯酚。对于所有酚类化合物，GAC 的去除效率均高于其他吸附剂。此外，RBA 的吸附容量高于 C. indica 生物质。RBA、GAC 和藻生物质去除苯酚、2-CP 和 4-CP 的最佳初始 pH 值分别确定为 5、7 和 7。动力学研究表明，伪二级动力学模型最适合该动力学数据。
