Citation: Zhu Yong, Bai Zhi-Shan, Wang Hua-Lin. Microfluidic synthesis of thiourea modified chitosan microsphere of high specific surface area for heavy metal wastewater treatment[J]. Chinese Chemical Letters, ;2017, 28(3): 633-641. doi: 10.1016/j.cclet.2016.10.031 shu

Microfluidic synthesis of thiourea modified chitosan microsphere of high specific surface area for heavy metal wastewater treatment

State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: Bai Zhi-Shan, baizs@ecust.edu.cn
Received Date: 27 July 2016
Revised Date: 23 September 2016
Accepted Date: 12 October 2016
Available Online: 1 March 2016

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An improved biosorbent of thiourea modified chitosan microsphere (TMCM) with high specific surface, favorable mechanical strength and excellent adsorption performance had been synthesized via microfluidic technology. Polyethylene glycol was used as a significant component added in aqueous solution of chitosan to produce such microspheres through droplets forming, chemical crosslinking and pores creating. For the improvement of adsorption capacity, thiourea was considered as an excellent choice in increasing amino functional group by graft modification. The SEM, FTIR and EDS were employed to detect distinct features of TMCM. Copper (Ⅱ) was used to test the adsorption performance of TMCM. The experimental results indicated that TMCM exhibited higher adsorption capacity (q_e=60.6 mg g^-1) and faster adsorption rate than that non-modified chitosan microsphere (NMCM). The adsorption kinetic was described well by the pseudo-second order kinetic model, which suggested that chemical adsorption along with electrons transferring was dominant in adsorption process.
- Thiourea modification,
- Chitosan microsphere,
- High specific surface area,
- Microfluidic technology,
- Adsorption
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