Boric acid modification enabled efficient phosphate removal with crayfish shell biochar via calcium coprecipitation
2025
Xiaoying Huang | Yan Gan | Xu Zhang | Lan Huang | Fengjiao Quan | Shunxi Zhang | Zhenhua Qin | Jianfen Li | Wenqing Wang | Wenjuan Shen
Although it has been demonstrated that biochar is an efficient technique for alleviating phosphate pollution in water, its widespread application has been limited due to the low adsorption capacity of raw biochar. Given calcium's high affinity for phosphate, this study prepared biochar through the pyrolysis of waste crayfish shells (PC) in the presence of boric acid (donated as BPC) and investigated its performance in removing phosphate from water. The experimental results shown that boric acid improved phosphate removal percentage of PC from 30.1 % to 99.2 % via enhancing the specific surface area and decreasing the original phosphorus content. The phosphate adsorption process of BPC followed a pseudo-first-order kinetic model, and the maximum adsorption capacity was 12.14 mg g−1. The Langmuir equation could better describe its adsorption behavior. Additionally, BPC exhibited excellent phosphate adsorption performance in a wide pH range, and high tolerance to co-existing ions in water. This study provided a promising method to enhance the performance of PC, benefitting the wide application of PC.
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