Removal of lead, copper, cadmium, zinc, and nickel from aqueous solutions by alkali-modified biochar: Batch and column tests

详细信息    查看全文

• 作者：Zhuhong Ding^a ; ^c ; Xin Hu^b ; ^c ; Yongshan Wan^d ; Shengsen Wang^c ; Bin Gao^c ; ^{bg55@ufl.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Sorption ; Filtration ; Engineered carbon ; Heavy metals ; Modified carbon
• 刊名：Journal of Industrial and Engineering Chemistry
• 出版年：2016
• 出版时间：25 January 2016
• 年：2016
• 卷：33
• 期：Complete
• 页码：239-245
• 全文大小：1453 K

文摘

Engineered biochar was obtained through slow pyrolysis of hickory wood and then further modified with NaOH. After modification, biochar's surface area, cation-exchange capacity, and thermal stability were significantly improved. The modified biochar exhibited much larger (2.6–5.8 times) metal adsorption capacities than the pristine biochar. Competitive batch adsorption of mixed metal ions (Pb²⁺, Cd²⁺, Cu²⁺, Zn²⁺, and Ni²⁺) showed preferential adsorption of Pb²⁺ and Cu²⁺ onto the modified biochar. The alkali-modified biochar in a fixed-bed column also showed strong ability to filter heavy metals from aqueous solutions. The alkali-modified biochar thus can serve as alternative absorbent for heavy metals.