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林产化学与工业 ›› 2014, Vol. 34 ›› Issue (4): 51-58.doi: 10.3969/j.issn.0253-2417.2014.04.009

• 研究报告 • 上一篇    下一篇

两性聚电解质P(DMDAAC-AM-AA)处理造纸白水中Ca2+的研究

孙旋, 戴红旗, 钱慧文, 毛圣陶, 王晶晶   

  1. 南京林业大学 江苏省制浆造纸科学与技术重点实验室, 江苏 南京 210037
  • 收稿日期:2013-05-21 出版日期:2014-08-25 发布日期:2015-08-18
  • 作者简介:孙旋(1987-),男,江苏南通人,硕士,主要从事造纸湿部化学研究工作
  • 基金资助:
    国家自然科学基金资助项目(31270614);江苏省高校自然科学研究重大项目资助(09KJA220002)

Removal of Ca2+ from Papermaking Whitewater by Polyampholyte P (DMDAAC-AM-AA)

SUN Xuan, DAI Hong-qi, QIAN Hui-wen, MAO Sheng-tao, WANG Jing-jing   

  1. Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China
  • Received:2013-05-21 Online:2014-08-25 Published:2015-08-18
  • Contact: 戴红旗,教授,博士生导师,研究领域为造纸清洁生产技术;E-mail:daihq@njfu.com.cn。 E-mail:daihq@njfu.com.cn

摘要: 以实验室自制聚二甲基二烯丙基氯化铵-丙烯酰胺-丙烯酸(P(DMDAAC-AM-AA))为吸附剂、造纸白水中Ca2+为吸附质,研究了pH值、Ca2+初始浓度及聚合物重均相对分子质量(MW)对吸附过程的影响,采用Freundlich、Langmuir等温吸附模型绘制了吸附等温线,并通过Lagrange动力学方程对实验数据进行了拟合。结果表明,碱性环境下有利于吸附过程的进行,且最佳pH值范围为9~11;随着Ca2+初始浓度的增加,吸附量先增加后趋于平稳;对吸附最有利的MW范围为600 000~800 000。聚合物对Ca2+的吸附动力学曲线符合Lagrange准二级动力学模型,属于化学吸附过程;其等温吸附曲线符合Langmuir模型,属于单分子层吸附;无量纲平衡参数(RL)值在不同温度下均小于0.5,表明吸附性能良好。同时,还探讨了纸浆纤维对聚合物的吸附性能和影响因素,采用傅立叶红外差谱进行了表征。结果表明,温度20~30℃、搅拌速度 120 r/min 的条件下,吸附在 60 min 时达到平衡,平衡吸附量为 2.4 mg/g(以绝干浆计)左右;红外差谱证实了纤维表面吸附有一定量的聚合物,且氢键结合是纤维与聚合物吸附的主要机理之一。

关键词: 两性聚电解质, 造纸白水, 钙离子, 纤维, 吸附

Abstract: A polyamoholyte, P(DMDAAC-AM-AA) which was composed of acrylamide (AM), acrylic acid (AA) and dimethyl diallyl ammonium chloride (DMDAAC) was prepared in the lab. Its property, mechanism and affecting factors for Ca2+ adsorption from papermaking whitewater were studied. The results indicated that, alkaline environment was beneficial to the adsorption process under the optimum pH range 9 to 11. Besides, along with the increasing of the initial concentration of Ca2+, the adsorption increased firstly and then leveled off, and the optimum molecular weight range was 600 000 to 800 000. Moreover, the adsorption kinetic curve of Ca2+ was represented as a chemisorption process and was quite fit for Lagrange pseudo-second-order model. The adsorption isotherm was accordance with a Langmuir model. It was a monomolecular layer and easy adsorption process. The values of RL at different temperatures were below 0.5. Besides, the adsorption of P(DMDAAC-AM-AA) onto fibers was characterized by FT-IR. The adsorption equilibrium was achieved at 60min as the whitewater was stirred at 120 r/min and 20-30℃, and the equilibrium absorption capacity was ca.2.4 mg/g oven dry fiber. The adsorption of the polymers on the fiber surface was confirmed by the FT-IR analysis.

Key words: polyampholyte, papermaking whitewater, calcium ion, fiber, adsorption

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