Improved adsorption of 4-nitrophenol onto a novel hyper-cross-linked polymer

被引:128
|
作者
Pan, Bingcai [1 ]
Du, Wei
Zhang, Weiming
Zhang, Xiao
Zhang, Qingrui
Pan, Bingjun
Lv, Lu
Zhang, Quanxing
Chen, Jinglong
机构
[1] Nanjing Univ, State Key Lab Pollut Control & Resources Reuse, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Sch Environm, Nanjing 210093, Peoples R China
[3] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 119260, Singapore
关键词
D O I
10.1021/es070134d
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In the present study we prepared a hyper-cross-linked polymeric adsorbent (NDA-701) possessing a uniquely bimodal pore size distribution for 4-nitrophenol (4-NP) adsorption from water. A macroporous polymeric adsorbent Amberlite XAD-4 and a granular activated carbon GAC-1 were chosen for comparison. NDA-701 exhibited better mechanical strength and higher capacity of 4-NP than XAD-4, which possibly resulted from its hyper-cross-linking nature and micropore structure, respectively. 4-NP adsorption isotherm onto NDA-701 is well described by the Freundlich model, and its better kinetics performance than GAC-1 resulted from its macropore structure After adsorption NDA-701 was amenable to an entire regeneration by using NaOH solution as regenerant, whereas only similar to 75% regeneration efficiency was observed for GAC-1. Results of continuous fixed-bed runs in pilot and industrial scale demonstrated that NDA-701 is capable of completely removing 4-NP from chemical effluent with no capacity loss, and 4-NP can be readily recovered by further treatment of the concentrated regenerant solution. It is attractive that the value of the recovered 4-NP from chemical wastewater will even engender a surplus after countervailing all the operation cost during field application.
引用
收藏
页码:5057 / 5062
页数:6
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