Calcium-Loaded Municipal Sludge-Biochar as an Efficient and Stable Catalyst for Biodiesel Production from Vegetable Oil

Yazhuo Wang, O. Denian Li, O. Dandan Zhao, Yukun Fan, Jingwang Bi, Rui Shan, Jizhang Yang, Bo Luo, Haoran Yuan, Xiang Ling, Taoli Huhe, Yong Chen