Improved adsorption of 4-nitrophenol onto a novel hHyper-cross-linked polymer.
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 approximately 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.
Pan
Bingcai
B
State Key Laboratory of Pollution Control and Resources Reuse, Nanjing University, Nanjing 210093, PR China. bcpan@nju.edu.cn
Du
Wei
W
Zhang
Weiming
W
Zhang
Xiao
X
Zhang
Qingrui
Q
Pan
Bingjun
B
Lv
Lu
L
Zhang
Quanxing
Q
Chen
Jinglong
J
D000327:Adsorption; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D009596:Nitrophenols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013816:Thermodynamics
D009596:Nitrophenols; D011108:Polymers; C024836:4-nitrophenol