摘要
对超高交联聚苯乙烯树脂进行硝基修饰,制得硝基修饰超高交联聚苯乙烯树脂JN-5(简称JN-5)。JN-5树脂具有比表面积高、亲水性强等优点。对酚类化合物在水溶液中进行静态吸附研究,平衡吸附试验数据和吸附热力学计算结果都表明,JN-5对4种酚类化合物(对甲基苯酚、苯酚、对氯苯酚、对硝基苯酚)的吸附性能优于大孔吸附树脂XAD-4。这主要得益于JN-5的高比表面积和丰富的微孔结构。动态小柱吸附试验中,在流速4.77mL/h、303K的条件下,JN-5对苯酚的穿透吸附量为2.43mmol/g,总吸附量为3.26mmol/g,吸附后的树脂能用8%(质量分数)的NaOH溶液完全洗脱。
A new adsorbent （JN-5） was prepared by modification of the nitro group of the base hypercrosslinked resin in the lab. Using JN-5, series of adsorption isotherm and breakthrough experiments were performed on solutions of phenol, p-cresol, p-chlorophenol, and p-nitrophenol to gather the adsorptive capacity data at three temperatures （283, 303 and 323 K） and also to estimate the isosteric enthalpy of adsorption, free energy and entropy of adsorption. The adsorption isotherm data were well represented by the Freundlich isotherm model. Relative to Amberlite XAD-4, JN-5 exhibited higher capacities for the phenolic adsorbates due to its more highly developed microporous structure and higher specific surface area. Mini-column （10.00 cm×0.45 cm diameter column, influent concentration= 6 160.0 mg/L, flowrate=4.77 mL/h） breakthrough data for phenol on JN-5 show its breakthrough capacity and total capacities were 2.43 mmol/g and 3.26 retool/g, respectively. The spent JN-5 adsorbent was effectively regenerated by the 8% NaOH solution fed at 1.59 mL/h at 303 K. JN-5 may be attractive for some wastewater treatment applications.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2008年第5期4-9,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.50778088)
