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![Dyeing sludge-derived biochar for efficient removal of malachite green from dyeing wastewater](https://image.oaes.cc/81068ed7-5a72-49f2-89d9-76a24e4ff1df/wecn3025.fig.1.jpg)
Figure 1. Response surfaces and contours of iodine adsorption by ZSC under three single factors. (A) Three-dimensional response surfaces and (B) contour plots of pyrolysis temperature (700-900 °C) vs. pyrolysis time (1.0-2.0 h); (C) Three-dimensional response surfaces and (D) contour plots of pyrolysis temperature (700-900 °C) vs. mass ratio of ZnCl2 to sludge (1:2-2:1); (E) Three-dimensional response surfaces and (F) contour plots of pyrolysis time (1.0-2.0 h) vs. mass ratio of ZnCl2 to sludge (1:2-2:1). ZSC: ZnCl2 modified sludge biochar.