Rapid and effective removal of sodium lignosulfonate from aqueous solutions by in-situ formed magnesium hydroxide
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- 作者：Lanlan Ye ; Feng Li ; Tao Wu ; Yujiang Li
- 关键词：In ; situ ; Adsorption ; Surfactant ; Particles
- 刊名：Korean Journal of Chemical Engineering
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：33
- 期：12
- 页码：3541-3549
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Industrial Chemistry/Chemical Engineering; Catalysis; Materials Science, general; Biotechnology;
- 出版者：Springer US
- ISSN：1975-7220
- 卷排序：33
文摘
We investigated the efficiency of in-situ formed magnesium hydroxide (Mg(OH)2) for the removal of sodium lignosulfonate (SLSN) from aqueous solution. Adsorption experiments considered the effects of various conditions such as pH, MgCl2 concentration, contact time, and temperature on SLSN removal efficiency. It was found that approximately 93%-99% SLSN was removed by in-situ formed Mg(OH)2. The adsorption was rapid, and the contact time required to reach complete adsorption equilibrium was less than 2min. Moreover, that the Mg(OH)2 lost about 0.5–3.0% adsorption capacity for SLSN when NO3−, HCO3−, H2PO4− and SO42− anions were simultaneously present with SLSN. The experimental data suggested that there was little competitive adsorption of SLSN with other coexisting anions on Mg(OH)2. The co-precipitation/adsorption process was exothermic and physical, involving weak interactions such as electrostatic attraction, hydrogen bonding, adhesive forces, and van der Waals forces between SLSN molecules and the binding sites on Mg(OH)2.