Cr(VI) removal from synthetic wastewater using coconut shell charcoal and commercial activated carbon modified with oxidizing agents and/or chitosan

来自 dx.doi.org

喜欢 0

阅读量：

323

作者：

S Babel，TA Kurniawan

展开

摘要：

In this study, the technical feasibility of coconut shell charcoal (CSC) and commercial activated carbon (CAC) for Cr(VI) removal is investigated in batch studies using synthetic electroplating wastewater. Both granular adsorbents are made up of coconut shell ( Cocos nucifera L.), an agricultural waste from local coconut industries. Surface modifications of CSC and CAC with chitosan and/or oxidizing agents, such as sulfuric acid and nitric acid, respectively, are also conducted to improve removal performance. The results of their Cr removal performances are statistically compared. It is evident that adsorbents chemically modified with an oxidizing agent demonstrate better Cr(VI) removal capabilities than as-received adsorbents in terms of adsorption rate. Both CSC and CAC, which have been oxidized with nitric acid, have higher Cr adsorption capacities (CSC: 10.88, CAC: 15.47 mg g 1) than those oxidized with sulfuric acid (CSC: 4.05, CAC: 8.94 mg g 1) and non-treated CSC coated with chitosan (CSCCC: 3.65 mg g 1), respectively, suggesting that surface modification of a carbon adsorbent with a strong oxidizing agent generates more adsorption sites on their solid surface for metal adsorption.

展开

关键词：

low cost adsorbent surface oxidation nitric acid sulfuric acid electroplating industry wastewater treatment

DOI：

10.1016/j.chemosphere.2003.10.001

被引量：

797

年份：

2004